Bsi-7263-1 Concrete Pre-Cast Unreinforced Concrete Paving F PDF
Bsi-7263-1 Concrete Pre-Cast Unreinforced Concrete Paving F PDF
Bsi-7263-1 Concrete Pre-Cast Unreinforced Concrete Paving F PDF
ICS 91.100.30
BS 7263-1:2001
The following bodies were also represented in the drafting of the standard,
through subcommittees and panels:
© BSI 08-2001
Amendments issued since publication
First published May 1990
Second edition April 1994 Amd. No. Date Comments
Third edition September 2001
Contents
Page
Committees responsible Inside front cover
Foreword iii
1 Scope 1
2 Normative references 1
3 Definitions 1
4 Materials 3
5 Requirements 3
6 Manufacturer’s evaluation of conformity 7
7 Marking 8
8 Test report 8
Annex A (normative) Manufacturer’s evaluation of conformity 9
Annex B (normative) Measurement of the dimensions of a single
paving flag 12
Annex C (normative) Sampling and testing of a consignment in case
of dispute 14
Annex D (normative) Method for determining weathering resistance 15
Annex E (normative) Method for measuring bending strength 21
Annex F (normative) Method for measuring abrasion resistance 23
Annex G (normative) Method for determining the slip/skid resistance value 30
Annex H (normative) Method for verifying visual properties 31
Annex I (normative) Conformity assessment for bending strength 32
Annex J (informative) Example of a typical production control system 32
Bibliography 35
Figure 1 — Dimensions and spacing of flattened domes on tactile crossing
paving flags 4
Figure B.1 — Notched straightedge and gauge 13
Figure B.2 — Calibrated square 14
Figure D.1 — Example of the cross-section of a specimen (right) and a
specimen seen from above (left) 17
Figure D.2 — Principle of set-up for the freeze/thaw test 18
Figure D.3 — Time–temperature cycle 19
Figure E.1 — Principle of operation of transverse testing machine 21
Figure F.1 — Principle of operation of wearing machine 24
Figure F.2 — Position of the slot in the base of the flow guidance hopper 25
Figure F.3 — Position of the slot relative to the wide abrasion wheel —
Cylindrical hopper 26
Figure F.4 — Position of the slot relative to the wide abrasion wheel —
Rectangular hopper 27
Figure F.5 — Example of a tested specimen showing a groove 29
Table 1 — Designated rectangular paving flag sizes 3
Table 2 — Dimensions and spacing of flattened domes on tactile crossing
paving flags 4
Table 3 — Tolerances for work dimensions 5
Table 4 — Maximum differences 5
Table 5 — Tolerances for flatness and bow 5
Table 6 — Weathering resistance classes 6
Table 7 — Bending strength classes 6
Table 8 — Abrasion resistance classes 6
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Page
Table 9 — Slip/skid resistance classes 7
Table 10 — Classes and their identification 8
Table A.1 — Periodically repeated type testing 9
Table A.2 — Sampling plan and conformity criteria for initial and
further type testing 10
Table B.1 — Dimensions of notched straightedge and gauge 13
Table C.1 — Sampling and testing plan 15
Table C.2 — Sampling and testing plan for additional properties 15
Table D.1 — Co-ordinates of break points 19
Table J.1 — Testing and measuring equipment 32
Table J.2 — Storage and production equipment 32
Table J.3 — Materials inspection 33
Table J.4 — Production process inspection 33
Table J.5 — Product testing 34
Table J.6 — Marking, storage and delivery 34
ii © BSI 08-2001
BS 7263-1:2001
Foreword
This part of BS 7263 has been prepared by Technical Committee B/507. Together
with BS 7263-3:2001 it supersedes BS 7263-1:1994 which is withdrawn.
This revision of part 1 has been prepared to reflect current CEN principles
regarding the writing of standards for this type of product: such standards are
now performance-based instead of recipe-based. This has entailed taking out the
requirements for materials and inserting far more performance requirements.
To support this change, test methods have now been included as annexes. This
revision has also introduced a requirement for type testing and factory production
control, together with an example of a production control procedure.
Users of this standard should be aware that the concept of type testing (see A.2)
has been brought forward from Harmonized European Standards, and is
intended to give the manufacturer and any attestation body confidence that a new
or modified product will conform to the performance requirements during regular
production runs. The requirements for products to meet this standard are given
in clause 5. The requirements specified in A.2 are only for type testing.
The following specific changes have been made in this revision:
a) the dimensional requirements have been removed so that paving flags can be
of any shape or size (the shapes and sizes in the previous edition have been
retained as designated units);
b) the water absorption limit has been removed;
c) the bending load requirement has been replaced by a bending strength
requirement and the test method has been modified accordingly;
d) performance requirements and test methods have been added for:
1) weathering resistance (freeze/thaw);
2) abrasion resistance;
3) slip/skid resistance;
4) visual properties;
e) for weathering resistance, abrasion resistance and slip/skid resistance,
performance classes have been introduced; these include a class for
“no performance determined”, which enables the purchaser to request a
product appropriate to its intended use and location.
This British Standard is an adaptation of the current draft of the European
Standard prEN 1339, following the publication of which as BS EN 1339 this
standard, BS 7263-1, will be withdrawn.
Annex A, Annex B, Annex C, Annex D, Annex E, Annex F, Annex G, Annex H
and Annex I are normative. Annex J is informative.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i to iv,
pages 1 to 35 and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.
1 Scope
This part of BS 7263 specifies requirements and test methods for precast, unreinforced concrete paving
flags and complementary fittings. It specifies the dimensions of rectangular paving flags designated in the
United Kingdom, and the dimensions and shapes of tactile paving flags. It is applicable to precast,
unreinforced concrete paving flags and complementary fittings that are particularly for use in external
trafficked paved areas.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute
provisions of this part of BS 7263. For dated references, subsequent amendments to, or revisions of, any of
these publications do not apply. For undated references, the latest edition of the publication referred to
applies.
BS 812-114:1989, Testing aggregates — Method for determination of the polished-stone value.
BS 7932:1998, Method for determination of polished paver value (PPV).
BS EN 10083-2:1991, Quenched and tempered steels — Part 2: Technical delivery conditions for unalloyed
quality steels.
BS EN ISO 4288:1998, Geometric product specification (GPS) — Surface texture — Profile method —
Rules and procedures for the assessment of surface texture.
BS ISO 8486-1:1996, Bond abrasives — Determination and designation of grain size distribution —
Part 1: Macrogrits F4 to F220.
3 Definitions
For the purposes of this British Standard the following definitions apply:
3.1
paving flag
precast, unreinforced concrete unit used as a surfacing material
3.2
tactile paving flag
paving flag provided with a profiled surface, used to give warning of hazards, or to enable locations to be
recognized
NOTE A crossing flag is an example of a tactile paving flag.
3.3
complementary fitting
unit that is used to infill and enable an area to be completely surfaced
NOTE A complementary fitting can be a piece of a paving flag.
3.4
upper face
surface intended to be seen when in use
3.5
bed face
surface generally parallel to the upper face and in contact with the bedding after laying
3.6
chased side face
side face of a paving flag having a recessed profile
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BS 7263-1:2001
3.7
facing layer
layer of concrete providing the upper face of a paving flag, of different material and/or properties to the
main body or backing layer
3.8
spacer nib
small protruding profile on a side face of a paving flag
3.9
arris
part of a paving flag where two faces meet
NOTE An arris can be bevelled, rounded, chamfered, radiused or splayed.
3.10
chamfer
bevelled arris with horizontal or vertical dimensions exceeding 2 mm
3.11
secondary processing
manufacturing process to texture a whole paving flag or any of its surfaces, carried out after basic
manufacture before or after hardening
3.12
work dimension
dimension of a paving flag specified for its manufacture
3.13
actual dimension
dimension of a paving flag as measured
3.14
overall length
length of the longer side of the smallest rectangle that encloses the entire paving flag, excluding any spacer
nibs
3.15
overall width
width of the shorter side of the smallest rectangle that encloses the entire paving flag, excluding any spacer
nibs
3.16
thickness
distance between the upper face and the bed face of a paving flag
3.17
slip resistance
ability of a paving flag to resist relative movement between a pedestrian foot and the trafficked flag surface
3.18
skid resistance
ability of a paving flag to resist relative movement between a vehicle tyre and the trafficked flag surface
2 © BSI 08-2001
BS 7263-1:2001
4 Materials
The materials used for the manufacture of paving flags shall be at the manufacturer’s discretion.
Details of the materials used shall be declared in the manufacturer’s production control documentation
(see Annex A).
5 Requirements
5.1 General
Paving flags shall be produced either with a single type of concrete throughout or with different facing and
backing layers. If paving flags are produced with a facing layer this shall, when measured in accordance
with Annex B, have a minimum thickness of 12 mm, excluding isolated particles of aggregate protruding
into the facing layer, over the area declared by the manufacturer. The facing layer shall be bonded to the
backing layer.
It shall be permissible for a “square” arris to be either bevelled or rounded. A “square” arris shall have
horizontal and vertical dimensions not exceeding 2 mm. The dimensions of a chamfer shall be at the
discretion of the manufacturer. The dimensions shall be declared in the manufacturer’s production control
documentation (A.3.1).
NOTE A bevelled arris with dimensions exceeding 2 mm is described as chamfered.
If a paving flag is produced with functional and/or decorative profiles, these profiles shall not be included
in the work dimensions of the paving flag. If a paving flag is produced with surfaces that are textured,
secondary processed or treated chemically, these finishes or treatments shall be at the discretion of the
manufacturer. All finishes and treatments shall be declared in the manufacturer’s production control
documentation (A.3.1).
In the event of a dispute regarding the quality of a consignment of paving flags, the procedure specified in
Annex C shall be followed.
5.2 Shape and dimensions
5.2.1 General
NOTE All dimensions in this subclause are work dimensions.
Excluding complementary fittings, the overall length and the overall width of a paving flag shall not
exceed 1 m.
Excluding complementary fittings, the length of a paving flag divided by its thickness shall be greater
than 4.
5.2.2 Work dimensions
The work dimensions of rectangular paving flags of designations A to G shall be as specified in Table 1.
The work dimensions for paving flags of other shapes and sizes shall be at the discretion of the
manufacturer. The work dimensions used for these paving flags shall be declared in the manufacturer’s
production control documentation (A.3.1). Tactile crossing paving flags shall be provided with flattened
domes on the wearing surfaces. The flattened domes shall have the dimensions and spacings specified in
Figure 1 and Table 2.
Table 1 — Designated rectangular paving flag sizes
Paving flag designation Nominal size Work dimensions Thickness
mm mm mm
© BSI 08-2001 3
BS 7263-1:2001
a) Plan
b) Elevation
Figure 1 — Dimensions and spacing of flattened domes on tactile crossing paving flags
Table 2 — Dimensions and spacing of flattened domes on tactile crossing paving flags
Tactile crossing flag type Dimension X Dimension Y
mm mm
TC/E 64 33
TC/F 66.8 33
TC/G 75 37.5
Tolerance: ±2
4 © BSI 08-2001
BS 7263-1:2001
5.2.3 Spacer nibs, draw, and chased and profiled side faces
If a paving flag is produced with spacer nibs, a draw, or chased and profiled side faces, the work dimensions
of these items shall be at the discretion of the manufacturer. The work dimensions of these items shall be
declared in the manufacturer’s production control documentation (see A.3.1).
5.2.4 Tolerances
When the dimensions of a single rectangular paving flag are measured in accordance with Annex B, the
tolerances shall be as specified in Table 3.
Table 3 — Tolerances for work dimensions
Class Tolerance
mm mm
D1 ±5 ±3
D2 ±2 ±3
The difference between any two measurements of the length, width and thickness of a single paving flag
shall be less than 3 mm.
For the dimensions of non-rectangular paving flags, the tolerances shall be at the discretion of the
manufacturer. These tolerances shall be declared in the manufacturer’s production control
documentation (A.3.1).
The maximum difference between the measurements of the two diagonals of a rectangular paving flag shall
be no greater than the differences specified in Table 4.
Table 4 — Maximum differences
Class Length of diagonal Maximum difference
mm mm
mm mm mm
© BSI 08-2001 5
BS 7263-1:2001
W1 No performance determined
W2 u1.0, no individual value >1.5
W3 Manufacturer’s declared value (A.3.1)
NOTE The manufacturer’s declared value is usually applied to secondary processed products.
MPa MPa
B1 3.7 3.0
B2 5.3 4.2
5.3.4 Abrasion resistance
When paving flags are tested in accordance with Annex F, classes shall be assigned to them according to
the values specified in Table 8. No individual result shall be greater than the specified value. Families of
paving flags that have not been tested for abrasion resistance shall be assigned class A1.
Table 8 — Abrasion resistance classes
Class Degree of abrasion
mm
A1 No performance determined
A2 30
A3 26
A4 23
6 © BSI 08-2001
BS 7263-1:2001
C scale units
S1 No performance determined
S2 W35
S3 W45
S4 Manufacturer’s declared value (A.3.1)
NOTE Paving flags of class S2 are suitable for use in pedestrian areas and paving flags of class S3 are suitable for use in
vehicular areas.
5.4.2 Texture
If paving flags are produced with a special surface texture, the texture shall be at the discretion of the
manufacturer. The properties of the textured surface shall be declared in the manufacturer’s production
control documentation (see A.3.1). Paving flags with a special surface texture shall be deemed to conform
to this part of BS 7263 if, when examined in accordance with Annex H, there are found to be no significant
visible differences to any samples supplied by the manufacturer and approved by the purchaser.
5.4.3 Colour
NOTE 1 Colours may be provided in a facing layer or throughout a paving flag at the manufacturer’s discretion.
Paving flags containing colours shall be deemed to conform to this part of BS 7263 if, when examined in
accordance with Annex H, there are found to be no significant differences in colour to any samples supplied
by the manufacturer and approved by the purchaser.
NOTE 2 Variations in the colour consistency of paving flags can be caused by unavoidable variations in the shade and properties of
the raw materials and by variations in hardening.
© BSI 08-2001 7
BS 7263-1:2001
7 Marking
The following particulars relating to paving flags shall be indicated clearly on any one of the delivery note,
invoice, packaging, or supplier’s certificate or brochure supplied with the consignment of paving flags:
a) identification of the manufacturer or the factory;
b) date of production;
c) class(es) where applicable (see Table 10);
d) the number of this British Standard1);
e) identification of the product (i.e. concrete paving flags).
Table 10 — Classes and their identification
Parameter Class marking
8 Test report
A test report shall be produced for each test that is performed by an external laboratory. The test report
shall contain the following particulars:
a) name of the organization carrying out the test;
b) name of the person carrying out the test;
c) date of the test;
d) name of the source providing the sample;
e) sample reference, including the date of production;
f) name of the person taking the sample;
g) annex and/or relevant British Standard in which the test method is specified;
h) name of the test;
i) test result;
j) any pertinent remarks about the sample or test result.
1)Marking BS 7263-1:2001 on or in relation to a product represents a manufacturer’s declaration of conformity, i.e. a claim by or
on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the
claimant’s responsibility. Such a declaration is not to be confused with third-party certification of conformity.
8 © BSI 08-2001
BS 7263-1:2001
Annex A (normative)
Manufacturer’s evaluation of conformity
A.1 General
For the purpose of testing, products shall be grouped into families, where the value of a selected property
is common to all products within that family.
NOTE Examples of such families are:
— strength family: paving flags manufactured using the same type of materials and production methods, irrespective of
dimensions and colours;
— surface family: paving flags with face mixes having the same prime aggregate used in the mix, e.g. natural river gravel,
crushed granite, porphyry, basalt or limestone, and the same surface treatment of the finished product, irrespective of dimensions
and colours.
Abrasion (classes A2, A3 and A4) Once per year per surface family
Weathering resistance (class W2 only) Once per year per surface familya
Slip and/or skid resistance Once per year per surface family
a If, for a surface family, the result of a type test (mass loss) is lower than 50 % of the required value, the repeated type tests may
be carried out every 2 years as long as this condition continues to be fulfilled.
© BSI 08-2001 9
BS 7263-1:2001
A.2.3 Sampling, testing and conformity criteria for initial and further type testing
The number of paving flags to be tested shall be in accordance with Table A.2 for the selected property.
Table A.2 — Sampling plan and conformity criteria for initial and further type testing
Property Requirement Test method in No. of Conformity criteria
specified in accordance with paving flags
Shape and dimensions 5.2 Annex Ba 6b Each paving flag shall meet the
requirements.
Weathering resistance 5.3.2 Annex D 3 The mean of the three results shall
(class W2 only) be not greater than 1.0 kg/m2 and no
individual result shall be greater
than 1.5 kg/m2.
Bending strength 5.3.3 Annex E 6 Class B1: the mean bending strength
of the six paving flags shall not be
less than 3.7 MPa and no individual
paving flag shall have a bending
strength less than 3.5 MPa.
Class B2: the mean bending strength
of the six paving flags shall not be
less than 5.3 MPa and no individual
paving flag shall have a bending
strength less than 5.0 MPa.
Abrasion resistance 5.3.4 Annex F 3 Each paving flag shall meet the
(class A2 only) requirements.
Slip/skid resistance 5.3.5 Annex G 4 Class S2: the slip/skid resistance
(only where tested) value shall be not less than 35.
Class S3: the slip/skid resistance
value shall be not less than 45.
Appearance 5.4.1 Annex H 8b No paving flag shall show cracking,
flaking or delaminationc.
a B.6 applies only to paving flags with a facing layer.
b These paving flags may be used for subsequent tests.
c Delamination applies only to paving flags with a facing layer.
The type tests shall be carried out in accordance with the test methods called up in this part of BS 7263.
The test results shall be recorded.
NOTE Type testing is normally carried out with the manufacturer’s test equipment.
10 © BSI 08-2001
BS 7263-1:2001
© BSI 08-2001 11
BS 7263-1:2001
Annex B (normative)
Measurement of the dimensions of a single paving flag
B.1 Preparation
Remove all flashings and burrs from the paving flag to be measured.
B.2 Overall dimensions
Using measuring equipment with a precision of 0.5 mm, measure the relevant dimensions in two different
places for each dimension and record the actual dimensions obtained to the nearest whole number of
millimetres.
For a rectangular paving flag, measure the diagonals and record the difference between the two
measurements.
B.3 Thickness
Using measuring equipment with a precision of 0.5 mm, measure the thickness of the paving flag to the
nearest millimetre. Take measurements at four points between 20 mm and 30 mm from the edge and
within 100 mm from each corner. Record the four measurements and calculate the mean thickness to the
nearest whole millimetre. Calculate and record the maximum difference between any two readings to the
nearest whole millimetre.
B.4 Flatness and bow
B.4.1 Apparatus
B.4.1.1 Notched steel straightedge and gauge, capable of measuring to an accuracy of 0.1 mm over the
specified length ±1 mm, as shown in Figure B.1 and Table B.1.
B.4.2 Procedure
Using the largest appropriate notched straightedge and gauge (B.4.1.1), measure the maximum convex
and concave deviations along the two diagonal axes of the upper face to the nearest 0.1 mm. Record both
results.
B.5 Chamfer
B.5.1 Apparatus
B.5.1.1 Calibrated square, capable of measuring to an accuracy of 0.5 mm, as shown in Figure B.2.
12 © BSI 08-2001
BS 7263-1:2001
Dimensions in millimetres
mm mm mm
© BSI 08-2001 13
BS 7263-1:2001
Dimensions in millimetres
B.5.2 Procedure
Using the calibrated square (B.5.1.1), take measurements at four positions on the paving flag, one on each
side. Calculate and record the average vertical and horizontal dimensions of the chamfer to the nearest
whole number of millimetres.
Measure the draw and record its dimensions to a whole number of millimetres.
B.6 Thickness of facing layer
Take a paving flag that has been broken in the bending test. Using measuring equipment with a precision
of 0.5 mm, measure the thickness of the facing layer on the broken face at the point where, by visual
inspection, the value is at its lowest. Do not measure the thickness of the facing layer on a chamfer and
ignore isolated particles of aggregate protruding into it.
Record the measurement to the nearest millimetre.
B.7 Test report
The test report shall include all the measurements taken (see also clause 8).
Annex C (normative)
Sampling and testing of a consignment in case of dispute
C.1 General
In the event of a dispute regarding the quality of a consignment of paving flags, the procedure specified in
this annex shall be followed. The properties to be tested shall be restricted to those that are in dispute.
The properties to be tested shall normally be restricted to those specified in Table C.1.
The test for visual properties shall be carried out prior to the tests for any other properties. The purchaser
and the manufacturer shall agree a location for the test and they shall perform the test together at that
location.
NOTE 1 The location used for visual testing is normally the site or the factory.
With the exception of the test for visual properties, all tests shall be carried out in a laboratory agreed by
both the purchaser and the manufacturer. The purchaser and the manufacturer shall both be given the
opportunity to witness the sampling and testing.
NOTE 2 The manufacturer’s test equipment may be used to carry out the tests.
14 © BSI 08-2001
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Annex D (normative)
Method for determining weathering resistance
D.1 Principle
A test specimen is preconditioned and then subjected to 28 freeze/thaw cycles while the surface is covered
with a 3 % NaCl solution. The material that has scaled off is collected and weighed and the result expressed
as a mass per unit area of surface.
D.2 Materials
D.2.1 Potable water.
D.2.2 Freezing medium, consisting of a mass fraction of 97 % potable water and a mass fraction of
3 % NaCl.
D.2.3 Adhesive, resistant to the environmental conditions used in the test, for gluing the rubber sheet to
the concrete specimen.
NOTE Contact adhesive has proved to be a suitable adhesive for use in this procedure.
D.2.4 Silicon rubber, or other sealant, to provide a seal between the specimen and the rubber sheet and to
fill in any chamfer around the perimeter of the specimen.
© BSI 08-2001 15
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D.3 Apparatus
D.3.1 Saw, for cutting the concrete specimen.
D.3.2 Climate chamber, with a temperature of (20 ± 2) °C and a relative humidity of (65 ± 10) %. In the
climate chamber the evaporation from a free water surface shall be (200 ± 100) g/m2 in (240 ± 5) min.
The evaporation shall be measured from a bowl with a depth of approximately 40 mm and a cross-section
area of (22500 ± 2500) mm2. The bowl shall be filled up to (10 ± 1) mm from the brim.
D.3.3 Rubber sheet, (3 ± 0.5) mm thick, resistant to the salt solution used and elastic down to a
temperature of p20 °C.
D.3.4 Vernier calliper, with an accuracy of ±0.1 mm.
D.3.5 Thermal insulation material, consisting of expanded polystyrene (20 ± 1) mm thick with a thermal
conductivity between 0.035 W/m·K and 0.04 W/m·K or other equivalent insulation.
D.3.6 Polyethylene sheet, 0.1 mm to 0.2 mm thick.
D.3.7 Freezing chamber, incorporating a time-controlled refrigerating and heating system with a capacity
and air circulation such that the time–temperature curve presented in Figure D.3 can be followed.
D.3.8 Thermocouples, or an equivalent temperature-measuring device, for measuring the temperature in
the freezing medium on the test surface to an accuracy within ±0.5 °C.
D.3.9 Vessel, for collecting scaled material. The vessel shall be suitable for use up to 120 °C and shall
withstand sodium chloride attack.
D.3.10 Spray bottle, containing potable water for washing off scaled material and washing salt out of scaled
material.
D.3.11 Paint brush, 20 mm to 30 mm wide, with bristles cut down to about 20 mm long, for brushing off
scaled material.
D.3.12 Filter paper, for collecting scaled material.
D.3.13 Drying cabinet, with a temperature of (105 ± 5) °C.
D.3.14 Balance, with an accuracy of ±0.05 g.
D.4 Preparation of test specimen
The test specimen shall incorporate an upper face area greater than 7500 mm2 but less than 25000 mm2,
which shall be the test surface and shall have a maximum thickness of 103 mm. If the specimen has to be
taken from a paving flag to meet this requirement, it shall be sawn (D.3.1), when the paving flag is at least
20 days old.
When the test specimens are at least 28 days old, flashings and loose material shall be removed.
The specimens shall be placed in the climate chamber (D.3.2). There shall be a minimum air space between
the specimens of 50 mm. The specimens shall be cured for (168 ± 5) h.
The rubber sheet (D.3.3) shall be glued to all surfaces of the specimen except the test surface, using the
adhesive (D.2.3). Silicon rubber or other sealant (D.2.4) shall be used to fill in the chamfer around the
perimeter of the specimen and to provide a seal around the test surface in the corner between the concrete
and the rubber sheet to prevent water penetration between the specimen and rubber. The edge of the
rubber sheet shall reach (20 ± 2) mm above the test surface.
NOTE The adhesive should normally be spread on the concrete surfaces as well as on the rubber surfaces. The manner of gluing the
rubber sheet illustrated in Figure D.1 has proved suitable.
16 © BSI 08-2001
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Figure D.1 — Example of the cross-section of a specimen (right) and a specimen seen
from above (left)
Using the vernier calliper (D.3.4), the tested area A shall be established from the mean of three
measurements of its length and width to the nearest millimetre. After curing in the climate chamber,
potable water (D.2.1) with a temperature of (20 ± 2) °C shall be poured on the test surface to a depth of
(5 ± 2) mm. This shall be maintained for (72 ± 2) h at (20 ± 2) °C.
NOTE 1 This may be used to assess the effectiveness of the seal between the specimen and the rubber sheet.
Before the freeze/thaw cycling, all surfaces of the specimen except the test surface shall be covered with
thermal insulation material (D.3.5).
NOTE 2 The thermal insulation of the surfaces may be carried out during curing.
Between 15 min and 30 min before the specimens are placed in the freezing chamber, the water on the test
surface shall be replaced with a (5 ± 2) mm layer, measured from the top surface of the specimen, of
3 % NaCl in potable water (D.2.2). This shall be prevented from evaporating by applying a horizontal
polyethylene sheet (D.3.6) as shown in Figure D.2. The polyethylene sheet shall remain as flat as possible
throughout the test and shall not come into contact with the freezing medium.
© BSI 08-2001 17
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D.5 Procedure
Place the specimens in the freezing chamber (D.3.7) such that the test surface does not deviate from a
horizontal plane by more than 3 mm/m in any direction and such that the specimens are subjected to
repeated freezing and thawing.
During the test the time–temperature cycle in the freezing medium at the centre of the surface of all
specimens shall fall within the shaded area shown in Figure D.3. Furthermore the temperature shall
exceed 0 °C during each cycle for at least 7 h but not more than 9 h.
18 © BSI 08-2001
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NOTE The break points specifying the shaded area are given in Table D.1.
Table D.1 — Co-ordinates of break points
Upper limit Lower limit
h °C h °C
0 24 0 16
5 p 2 3 p4
12 p14 12 p20
16 p16 16 p20
18 0 20 0
22 24 24 16
Using the thermocouples (D.3.8), continuously record the temperature in the freezing medium at the centre
of the test surface for at least one specimen, which shall be located in a representative position in the
freezing chamber. Record the air temperature in the freezer during the test. Start the timing of the first
cycle of the test on a specimen within (0 ± 30) min of it being placed in the freezing chamber.
If a cycle has to be interrupted, the specimen shall be kept in the frozen state between p16 °C and p20 °C.
If an interruption continues for more than 3 days the test shall be abandoned.
To obtain the correct temperature cycle for all the specimens, good air circulation shall be ensured in the
freezing chamber. If only a few specimens are to be tested, the empty places in the freezer shall be filled
with dummies, unless it has been demonstrated that the correct temperature cycle is achieved without
them.
After 7 cycles and 14 cycles, during the thaw period further solution of 3 % NaCl in potable water shall be
added if necessary in order to keep a (5 ± 2) mm layer on the surface of the samples.
© BSI 08-2001 19
BS 7263-1:2001
After 28 cycles carry out the following procedure for each specimen.
a) Collect material that has been scaled from the test surface by rinsing it into the vessel (D.3.9) using
the spray bottle (D.3.10) and brushing it into the vessel using the paint brush (D.3.11) until no further
scaled material is removed.
b) Pour the liquid and scaled material in the vessel carefully through a filter paper (D.3.12). Wash the
material collected in the filter paper with a minimum of 1 l of potable water to remove any
remaining NaCl.
c) Dry the filter paper and collected material in the drying cabinet (D.3.13) for at least 24 h
at (105 ± 5) °C.
d) Using the balance (D.3.14), determine to ±0.2 g the dry mass of the scaled material, making due
allowance for the filter paper.
D.6 Calculation of test result
Calculate the mass loss per unit area, m, of the specimen in kilograms per square metre (kg/m2) from the
following equation:
M
m = -----
A
where
M is the mass of the total quantity of material scaled after 28 cycles, in milligrams (mg);
A is the area of the test surface, in square millimetres (mm2).
D.7 Test report
The test report shall include the following information (see also clause 8):
a) mass of total quantity of material scaled after 28 cycles, in milligrams (mg);
b) area of the test surface, in square millimetres (mm2);
c) mass loss per unit area of the specimen.
20 © BSI 08-2001
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Annex E (normative)
Method for measuring bending strength
E.1 Apparatus
E.1.1 Transverse testing machine, with a scale having an accuracy of ±3 % over the range of the
anticipated test loads and capable of increasing the load at specified rates. It shall be equipped with a
device that can induce 3-point bending into the specimen without torsion (see Figure E.1). The load-
inducing bar shall be equidistant between the supports. The length of the supports and the load-inducing
bar shall be at least equal to the width of the sample to be tested. The upper and lower bearers shall be
parallel and rigid, and round, or rounded to a radius of (20 ± 1) mm.
E.1.2 Packing pieces (optional), with a width not exceeding 25 mm. Their thickness shall be (4 ± 1) mm and
they shall be at least 10 mm longer than the width of the specimen.
© BSI 08-2001 21
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E.3 Procedure
The distance between the supports and the edge of the specimen shall be 25 mm unless this results in a
span of less than three times the thickness of the specimen. If the span is less than three times the
thickness, the distance between the bearers and the edge of the specimen shall be reduced to half the
thickness of the specimen. The actual span shall be measured and recorded.
Place the specimen symmetrically on the bearers of the transverse testing machine (E.1.1), with its upper
face uppermost and with its shorter side parallel to the supporting bearers.
Depending on the surface profile of the specimen, any one of the following shall be used at the discretion of
the manufacturer:
— no packing pieces;
— packing pieces (E.1.2);
— capping or grinding.
Apply the load without shock and increase the load uniformly so that the required load is reached
within (45 ± 15) s. Record the failure load, P, to the nearest 100 N.
E.4 Calculation of test result
Calculate the strength, T, in megapascals (MPa) of the specimen tested from the following equation:
3×P×L
T = -----------------------2
2×b×t
where
22 © BSI 08-2001
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Annex F (normative)
Method for measuring abrasion resistance
F.1 Principle
The test is carried out by abrading the upper face of a paving flag with an abrasive material under
controlled conditions.
F.2 Materials
F.2.1 Abrasive material, comprising fused alumina with a grit size of F80 in accordance with
BS ISO 8486-1:1996. A single quantity of abrasive material shall be used not more than three times.
The moisture content of the abrasive material shall not exceed 1.0 %.
F.3 Apparatus
F.3.1 Wearing machine (see Figure F.1), comprising a wide abrasion wheel (F.3.2), a mobile clamping
trolley (F.3.3), a storage hopper (F.3.4), a flow guidance hopper (F.3.5), and a counterweight.
F.3.2 Wide abrasion wheel, which shall be made of steel E360 in accordance with BS EN 10083-2:1991.
The hardness of the steel shall be between 203 HB and 245 HB. The diameter of the wheel shall be
(200 ± 1) mm and its width shall be (70 ± 1) mm. It shall be driven to rotate 75 revolutions in (60 ± 3) s.
F.3.3 Mobile clamping trolley, mounted on bearings and forced by a counterweight to move forwards to the
wheel.
F.3.4 Storage hopper, which shall contain the abrasive material and shall feed into the flow guidance
hopper. It shall have one or two control valves to regulate the output of the abrasive material. When two
valves are used, one shall be used to regulate the rate of flow and can be permanently set while the other
shall be used to turn the flow on and off.
F.3.5 Flow guidance hopper, which shall be either cylindrical or rectangular and shall have a slotted outlet
(see Figure F.2). The length of the slot shall be (45 ± 1) mm and the width shall be (4 ± 1) mm. The body of
the flow guidance hopper shall be at least 10 mm bigger than the slot in all directions [see Figure F.2a)],
unless the hopper is rectangular, with at least one of the sides inclined down to the long side of the slot, in
which case there shall be no dimensional limitations [see Figure F.2b)].
The distance of the fall between the slot and the axle of the wide abrasion wheel shall be (100 ± 5) mm and
the flow of the abrasive shall be 1 mm to 5 mm behind the leading edge of the wheel (see Figure F.3 or
Figure F.4).
The flow of the abrasive material from the flow guidance hopper shall be at a minimum rate of 2.5 l/min
onto the wide abrasion wheel. The flow of abrasive shall be constant and the minimum level of the abrasive
material in the flow guidance hopper shall be 25 mm (see Figure F.3 or Figure F.4).
© BSI 08-2001 23
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24 © BSI 08-2001
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Dimensions in millimetres
Figure F.2 — Position of the slot in the base of the flow guidance hopper
© BSI 08-2001 25
BS 7263-1:2001
Dimensions in millimetres
Figure F.3 — Position of the slot relative to the wide abrasion wheel —
Cylindrical hopper
26 © BSI 08-2001
BS 7263-1:2001
Dimensions in millimetres
Figure F.4 — Position of the slot relative to the wide abrasion wheel —
Rectangular hopper
F.3.8 Abrasive collector, to collect abrasive material falling from the wheel.
F.3.9 Pencil, with a lead diameter of 0.5 mm and a hardness of 6H or 7H.
F.3.10 Steel ruler, for measuring the abrasion groove.
F.3.11 Digital calliper, for measuring the abrasion groove.
© BSI 08-2001 27
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F.4 Calibration
The apparatus shall be calibrated after grinding 400 grooves or every 2 months, whichever is the lesser,
and every time there is a new operator, a new batch of abrasive material, or a new abrasion wheel.
The flow rate of the abrasive material shall be verified by pouring the material from a height of
approximately 100 mm into a pre-weighed rigid container with a smooth rim, of height (90 ± 10) mm and
of approximately 1 l volume when filled to the top. As the container fills, the pouring height shall be raised
to maintain approximately the 100 mm fall. When the container is filled, the top shall be struck off level
and the container weighed to determine the mass of abrasive material for a known volume, i.e. the density.
Abrasive material shall be run through the wearing machine for (60 ± 1) s and collected below the abrasion
wheel in a pre-weighed container of at least 3 l capacity. The filled container shall be weighed and the rate
of flow of abrasive material shall be determined.
The apparatus shall be calibrated, using the procedure in F.6, against a reference sample of “Boulonnaise
Marble” with the following properties:
— “Lunel demi-clair”;
— a thickness greater than or equal to 50 mm;
— cut perpendicular to the bed direction;
— two faces ground with a diamond grit size of 100/200;
— a roughness, when measured with a stylus measuring instrument in accordance with
BS EN ISO 4288, of Ra = (1.6 ± 0.4) 4m.
The counterweight shall be adjusted so that after 75 revolutions of the wheel in (60 ± 3) s the length of the
groove produced is (20.0 ± 0.5) mm.
The clamping trolley/counterweight assembly shall be checked for undue friction.
The groove shall be measured to the nearest 0.1 mm using the procedure in F.7, and the three results shall
be averaged to give the calibration value.
At every calibration of the apparatus, the squareness of the sample supports shall be checked and corrected
if necessary.
The groove on the reference sample shall be rectangular with the difference between the measured length
of the groove at either side not exceeding 0.5 mm. If necessary check that:
a) the sample has been held square to the wheel;
b) the clamping trolley and the slot from the flow guidance hopper are parallel to the wheel axle;
c) the flow of abrasive is even across the slot;
d) the friction in the trolley/counterweight assembly does not prevent smooth operation.
F.5 Preparation of specimen
The test specimen shall be a whole paving flag or a cut piece measuring at least 100 mm × 70 mm
incorporating the upper face of the paving flag. The test piece shall be clean and dry.
The upper face, which shall be tested, shall be flat within a tolerance of ±1 mm measured in accordance
with B.4 in two perpendicular directions, but over 100 mm.
If the upper face has a rough texture or is outside this tolerance it shall be lightly ground to produce a
smooth flat surface within this tolerance.
Immediately before testing, the surface to be tested shall be cleaned with a stiff brush (F.3.6) and covered
with a surface dye (F.3.7) to facilitate measuring the groove.
28 © BSI 08-2001
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F.6 Procedure
Fill the storage hopper with dry abrasive material (F.2.1). Move the clamping trolley away from the wide
abrasion wheel. Position the test specimen on it such that the groove produced is at least 15 mm from any
edge of the specimen, and fix the specimen on a wedge to let the flow of abrasive material pass under it.
Place the abrasive collector (F.3.8) beneath the wide abrasion wheel.
Bring the test specimen into contact with the wide abrasion wheel, open the control valve and
simultaneously start the motor so that the wide abrasion wheel achieves 75 revolutions in (60 ± 3) s.
Visually check the regularity of the flow of the abrasive material during the test. After 75 revolutions of
the wheel, stop the flow of abrasive material and the wheel.
F.7 Measuring the groove
Using the pencil (F.3.9) and ruler (F.3.10), draw the external longitudinal limits (l1 and l2) of the groove
(see Figure F.5).
Draw a line (A B) in the middle of the groove perpendicular to the centreline of the groove. Position the
square tips of the digital calliper (F.3.11) on the points A and B to the inside edge of the longitudinal limits
(l1 and l2) of the groove, and measure and record the dimension of the groove to the nearest 0.1 mm.
For calibration purposes, repeat the measurement (10 ± 1) mm from the ends of the groove (C D) to give
three readings.
NOTE Some surface dye can be removed above the groove by action of the abrasive. This should be ignored in producing line l1,
which should be drawn where the sample surface is abraded.
Dimensions in millimetres
© BSI 08-2001 29
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Annex G (normative)
Method for determining the slip/skid resistance value
G.1 Principle
The paving flag is tested to determine both the unpolished skid resistance value (USRV) and the polished
pendulum test value (PPTV). The lower of the two values determined is taken to be the slip/skid resistance
value.
G.2 Determination of the unpolished skid resistance value (USRV)
G.2.1 Principle
The measurement of the USRV of a specimen is made using a pendulum friction tester passing over the
surface of the specimen.
The USRV is not measured if the surface of the paving flag contains ridges, grooves or other surface
features that prevent testing by the pendulum friction tester, or if the paving flag is too small to provide a
test area (see G.2.3).
G.2.2 Apparatus
G.2.2.1 Pendulum friction tester, with a C scale, conforming to BS 812-114:1989. This shall be calibrated
at least annually and validated as specified in BS 7932:1998, 8.1. The rubber slider shall be 76 mm wide
and shall conform to BS 812-114.
G.2.3 Preparation of test specimens
Obtain a sample of four paving flags of the same family (see A.1) using the sampling procedure specified in
BS 7932:1998, Annex A. Cut a test specimen (typically 200 mm × 100 mm) from each paving flag which
permits a test area of 136 mm × 86 mm.
Place the test specimens in water at (20 ± 2) °C until they are tested.
G.2.4 Procedure
Keep the pendulum friction tester (G.2.2.1) and rubber slider in a room at a temperature of (20 ± 2) °C for
at least 2 h before commencing testing.
Place the pendulum friction tester upon a firm, level surface and adjust the levelling screws so that the
pendulum support column is vertical. Raise the axis of suspension of the pendulum so that the arm swings
freely and adjust the friction in the pointer mechanism so that when the pendulum arm and pointer are
released from the right-hand horizontal position the pointer comes to rest at zero position on the test scale.
Before using a new rubber slider, condition it using the method specified in BS 812-114:1989. Discard any
rubber slider that fails to conform to BS 812-114:1989.
Carry out the pendulum test on each of the four specimens using the following procedure, using the rubber
slider over a 126 mm swept length and with readings taken on the C scale.
Immediately prior to testing with the pendulum friction tester, remove the specimen from the water.
Locate the test specimen with its longer dimension lying in the track of the pendulum, and centrally with
respect to the rubber slider and to the axis of the suspension of the pendulum. Ensure that the track of the
rubber slider is parallel to the long axis of the specimen across the sliding distance.
Adjust the height of the pendulum arm such that in traversing the specimen, the rubber slider is in contact
with it over the whole width of the slider and over the swept length of 126 mm. Wet the surfaces of the
specimen and the rubber slider with a copious supply of clean water, being careful not to disturb the slider
from its set position. Release the pendulum and pointer from the horizontal position, and catch the
pendulum arm on its return swing. Record the position of the pointer on the scale.
Perform this operation five times, re-wetting the specimen each time. Record the mean of the last three
readings.
Rotate the specimen through 180° and repeat the procedure.
Repeat the test on each of the remaining three specimens.
30 © BSI 08-2001
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Annex H (normative)
Method for verifying visual properties
H.1 Preparation of sample
Each paving flag in the sample shall be examined for delamination. If any paving flag shows delamination,
the procedure specified in A.3.3 shall be followed. The remaining paving flags shall then be laid out at floor
level in a pattern approximating to a square.
H.2 Procedure
In natural daylight conditions an observer shall stand in turn at a distance of 2 m from each edge of the
square and shall record any paving flag showing cracks or flaking.
The texture shall be compared with any manufacturer’s reference samples supplied.
The visual properties shall be compared with any manufacturer’s reference samples supplied.
© BSI 08-2001 31
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Annex I (normative)
Conformity assessment for bending strength
If the mean strength of three paving flags tested is not lower than the mean value, and no individual
strength is lower than the minimum value specified in Table 7 for the intended class, the corresponding
production run shall be deemed to conform to this part of BS 7263.
If these conditions are not met, it shall be permissible to reclassify the corresponding production run to a
class where the mean strength of the three paving flags tested is not lower than the mean value and no
individual strength lower is than the minimum value specified in Table 7.
If the individual strength of any one of the paving flags tested is lower than the minimum value specified
in Table 7 for class B1, the corresponding production run shall be deemed not to conform to this part of
BS 7263.
Annex J (informative)
Example of a typical production control system
J.1 Equipment inspection
J.1.1 Testing and measuring equipment
Testing and measuring equipment should be inspected in accordance with Table J.1.
Table J.1 — Testing and measuring equipment
Subject Aim Method Frequency
All testing and To ensure Where applicable calibrating against On (re)installation, after
measuring functioning and equipment which has been calibrated major repair or once per
equipment accuracy traceable to national standards and is year
used exclusively for this purpose except
as indicated in the test method
J.1.2 Storage and production equipment
Storage and production equipment should be inspected in accordance with Table J.2.
Table J.2 — Storage and production equipment
Subject Aim Method Frequency
32 © BSI 08-2001
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All materials To ascertain that the Inspection of delivery ticket and/or label Each delivery
consignment is as on the package showing conformity to the
ordered and is from the order
correct source
J.3 Production process inspection
Production processes should be inspected in accordance with Table J.4.
Table J.4 — Production process inspection
Subject Aim Method Frequency
© BSI 08-2001 33
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34 © BSI 08-2001
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Bibliography
2) In preparation.
© BSI 08-2001 35
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Revisions
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responsible, the identity of which can be found on the inside front cover.
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