Sans 1200 MK
Sans 1200 MK
Sans 1200 MK
STANDAIinIZED S P E C I F I C A T I O N
for
C I V I L ENGINEERING CONSTRUCTION
A p p r o v e d by t h e O b t a i n a b l e f r o m the
COUNCIL OF THE S A BUREAU OF STANDARDS
SOUTH AFRICAN Private B a g X 1 9 1
BUREAU OF STANDARDS Pretoria
on 9 N o v e m b e r 1983 0001 R e p u b l i c of South A f r i c a
Telegrams : C o m p a r a t o r , Pretoria
Telex : 3-626-SA
P u b l i s h e d and p r i n t e d i n t h e R e p u b l i c of South A f r i c a
by t h e South A f r i c a n B u r e a u of Standards
ISBN 0-626-06784-7
Gr 6
3 SAUS 1200 MK-1983
Kerbirig and channel1ing
CONTENTS
1 . scom .......................................................................... 5
2 . INTERPRETATIONS ................................................................ 5
2.1 Supporting Specifications ...................................................... 5
2.2 Application .................................................................... 5
2.3 Definitions .................................................................... 5
3 .3.1 MATERIALS ...................................................................... 5
Concrete ....................................................................... 5
3.2 Precast Kerbing and Channelling ................................................ 5
3.2.1 General ........................................................................ 5
3.2.2 Curved kerbing ................................................................. 5
3.2.3 Strenqth ........................................................................ 5
3.2.4 Approval ....................................................................... 5
3.3 Cast-In-Situ Concrete for Curves of Radius Less Than 1 m ........................ 5
3.4 Brick-On-Edge Kerbing .......................................................... 5
3.5 Expansion Joint Sealant ........................................................ 5
3.6 Mortar ......................................................................... 5
3.7 Concrete for Extruded-In-Situ Kerbing and Channelling
Materials for concrete .............. ..........................
..........................................
5
5
3.7.1
3.7.2 Concrete ............................
Curing Compound .....................
..........................................
..........................................
6
6
3.8
3.9 Bedding Material ....................
...............................
..........................................
..........................................
6
4 . PLANT
Equipment for Machine Placing ....... ..........................................
6
6
5 .4.1
5.1
CONSTRUCTION ........................ ..........................................
Excavation and Bedding .........................................................
6
6
5.2 Precast Concrete Kerbing and Channelling ....................................... 6
5.3 Precast Concrete Chutes on Side Slopes of Fills and Cuts ....................... 6
5.4 Cast-In-Situ Concrete Kerbing and Channelling ..................................
..................
6
7
5.5 Cast-In-Situ Concrete Chutes on Side Slopes of Fills and Cuts
5.6 Concrete-Lined Open Drains ..................................................... 7
5.7 Brick-On-Edge Kerbing .......................................................... 7
5.8 Machine Placed (Extruded) Kerbing and Channelling
Type of construction
..............................
...........................................................
7
7
5.8.1
5.8.2 Weather limitations ............................................................ 7
5.8.3 Subbase preparation ............................................................ 7
5.8.4 Kerbing operation .............................................................. 7
5.8.5 Curing .........................................................................
Backfilling ....................................................................
7
7
5.9
5.10 Protection .....................................................................
Transition Sections and Inlet and Outlet Structures ...........................
U
8
5.11
Kerbside Stormwater Catchpits and Inlets ....................................... 8
6 .
5.12
6.1
TOLERANCES .....................................................................
Concrete Kerbing and Channelling ...............................................
8
U
STANDARD1ZED SPECIFICATION
for
1. SCOPE
1.1 This specification covers the construction of mountable, semi-mountable, and barrier kerbing and
channelling, as well as edging and chutes, that are precast or cast in situ by conventional methods or
extruded in situ by means of special plant.
2. INTERPRETATlONS
2.1 SUPPORTlNG SPECIFICATIONS
2.1.1 Where this specification is required for a project, the following specifications shall, inter alia, form
part of the contract document:
a) Project specification;
b) SABS 1200 A or SABS 1200 AA, as applicable;
c) SABS 1200 D or SABS 1200 DA, as applicable;
d) SABS 1200 DM;
e) SABS 1200 G or SABS 1200 GA, as applicable;
f) SABS 1200 ME, SABS 1200 MF, and SABS 1200 MG or SABS 1200 MH, as applicable.
2.1.2 In addition, if work involving stormwater drainage is included in the contract, SABS 1200 LE shall form
part of the contract document.
2.2 APPLICATJON. This specification contains clauses that are generally applicable to the construction of
kerbs and channels. Interpretations and variations of the specification are set out in Portion 2 of the
project specification which precedes this specification in a contract document.
2.3 DEFINITIONS. For the purposes of this specification the definitions and abbreviations given in the
applicable of the specifications listed in 2.1 and the following definition shall apply :
Kerb face or edging face. The front vertical or near vertical face of kerbing or edging that is exposed
after the kerbing or edging has been set or constructed in place for use.
3. MATERIALS
3.1 CONCRETE. All concrete work shall be carried out in accordance with the requirements of SABS 1200 G or
SABS 1200 GA, as applicable.
3.3 CAST-IN-SITU CONCRETE FOR CURVES OF RADIUS LESS THAN 1 m (see 5.4). Cast-in-situ concrete shall comply
with the relevant requirements of 3.2.1 and 3.2.3.
3.4 BRICK-ON-EDGE KERBING. Bricks for brick-on-edge kerbing shall comply with the relevant requirements of
SABS 227a) for solid Type E face bricks of approved colour and texture and shall have a compressive
strength of at least 25 MPa.
3.5 EXPANSION JOINT SEALANT. Sealant for expansion joints in kerbing shall comply with the relevant
requirements of SABS 110.
Sealant for expansion joints in channelling shall comply with the relevant requirements of BS 2499.
3.6 MORTAR. Mortar shall consist of a 1:3 cement/sand mix. The cement and sand shall comply with 3.7.l(a)
and (b) respectively.
b) Sand shall comply with the relevant requirements of SABS 1083. Its grading shall be such that easy
and smooth extrusion of dense concrete is ensured.
c) Stone shall comply with the relevant requirements of SABS 1003 for concrete stone of nominal size
13,2 mm.
d) Water shall be of drinking quality unless samples of water from sources that are not of such quality
have been approved by the Engineer.
3.7.2 Concrete. Unless otherwise specified in the project specification, concrete shall comply with
SABS 1200 G or SABS 1200 GA, as applicable, for strength concrete of Grade 25.
3.8 CURING COMPOUND. Where use of a curing compound is approved by the Engineer in terms of 5.8.5, the
compound shall comply with the relevant requirements of ASTM C 309.
3.9 BEDDING MATERIAL. The material on which precast concrete kerbs and channels are bedded, shall consist of
crushed stone, cinders, slag, sand, or other approved porous material having a maximum particle size of
13.2 nun.
4. PLANT
4.1 EQUIPMENT FOR MACHINE PLACING. The Contractor may use any approved machine that is capable of placing in
one continuous operation by means of slipforms, cast-in-situ kerbs and channels that have at least the
same standard of finished appearance and line as can be obtained by the methods specified in 5.4 and with
joints at the intervals specified in 5.4.
In order to ensure that the above requirements are met
a) the machine shall be equipped with one or more automatic sensing devices that control the height,
direction'and cross level of the machine;
b) the height control device shall be calibrated to ensure that the correct level of kerbing or
channelling, as relevant, is maintained;
c) where a machine operates on a ram-propulsion system, the machine shall be fitted with adequate brakes
to ensure full compaction, particularly on downgrades; and
d) sufficient hand tools shall be provided to ensure that the finish of the kerbing or channelling, as
relevant, is within the applicable of the tolerances specified in Clause 6.
5. CONSTRUCTION
5.1 EXCAVATION AND BEDDING. Trenches for kerbing and channelling shall be excavated to the required depth
and all unsuitable material shall be removed and replaced with a layer of approved bedding material (see
3.9) of thickness a t least 70 mm. The bedding shall be compacted and accurately shaped to the required
grade.
Excavations for open drains shall be so trimmed to the lines and levels given on the drawings as to
permit accurate construction of the concrete linings. All loose material shall be compacted to a density
of at least 90 % of modified AASHTO maximum density and no concrete shall be placed on uncompacted or
disturbed material. where, in the opinion of the Engineer, the in-situ material is unsuitable, the
Engineer may order that it be removed to the depth required and replaced with selected material compacted
to a density of at least 90 % of modified AASHTO maximum density.
Excavations for chutes shall be neatly trimmed. All loose material shall be compacted to at least 90 %
of modified AASHTO maximum density and where overbreak occurs in hard material, the excavations shall be
backfilled with well punned Grade 15 concrete. If so required by the Engineer, the excavations shall be
taken deeper to accommodate a concrete screed cast to act as a working platiorm for the construction of
the chutes.
5.2 PRECAST CONCRETE KERnING AND CHANNELLING. Precast concrete kerbs and channels shall be laid and bedded
on a 50 mm thick layer of bedding material that complies with 3.9, placed on the compacted subbase or
other formation layer to suit the designated levels of the finished road. The kerbs and channels shall
be laid with close joints (of thickness not exceeding 10 mm) of 3:l sand:cement mortar on the ends, and
neatly pointed with a pointing trowel. The ends of the units shall be well moistened before jointing and
the joints shall be covered and kept moist for at least 48 h after jointing.
Provision shall he made for expansion joints of width at least 12 mm at intervals not exceeding 20 m, and
after the concrete has been allowed to dry thoroughly, the concrete surfaces shall be primed, and the
joints filled with a sealant (see 3.5).
After the grouting of kerb joints has been completed, the kerbs shall be backed with well-punned concrete
of specified strength 15 MPa and the space behind the backing shall be backfilled as specified in 5.9.
5.3 PRECAST CONCRETE CHUTES ON SIDE SLOPES OF FILLS AND CUTS. Precast concrete chutes shall be manufactured
in accordance with the dimensions shown on the drawings, and the units shall fit neatly into each other
as shown on the drawings.
The bottom unit, that is, the unit at the toe of the fill or at the bottom of the cut slope, shall rest
against the outlet structure or footing as shown on the drawings.
The units shall be neatly laid to line and grade from the bottom up so that each consecutive unit fits
neatly into the previous one.
A transition section shall be constructed in situ at the inlet, as shown on the drawings, to lead the
water into the chute.
5.4 CAST-IN-SITU CONCRETE KERBING AND CIlANNELLING. Kerbing and channelling shall he cast in alternate
sections. Except where shorter sections are necessary for closures or where otherwise shown on the
drawings or required by the Engineer, the lengths of sections shall be uniform throughout and equal to
2 m for every 100 mm average thickness OK depth of concrete measured perpendicular to the bed.
Joints between adjacent sections shall be truly perpendicular to the surface of the concrete and at right
angles to the edge of the road.
After concrete has been placed in the foims, it shall be tamped and spaded until mortar entirely covers
the exposed faces. Exposed faces shall then be finished to smooth and even surfaces and edges shall be
rounded to the radii shown on the drawings.
Forms shall not, within a period of 24 h after concrete has been placed, be removed from concrete
surfaces that will be exposed. Minor defects shall be repaired with a 2:l sand:cement mortar.
Plastering will not be permitted on exposed faces and all rejected portions shall be removed and replaced
at the Contractor's expense. Exposed surfaces shall be finished while the concrete is still green by
rubbing the surfaces with a soft brick o r a wooden block that is kept wet, until they are smooth. After
the concrete has been rubbed smooth it shall be rubbed with a thin paste of 1:l sand:cement mortar Until
a uniform colour is obtained. When completed, the sections shall be cured as specified in SABS 1200 G or
SABS 1200 GA, as applicable.
7 SAHS 1200 MK-1983
Kerbing and channelling
After the concrete in the alternate sections has set, the exposed end surfaces shall be painted with a
coat of an approved bitumjnous emulsion containing 60 % (m/m) of bitumen, and the emulsion shall be
allowed to set and dry. The intermediate sections shall then be cast and the exposed surfaces finished
off in accordance with the applicable requirements given above.
Guide lines and straight edges shall be used to ensure that the exposed faces of kerbing and channelling
are formed true to line and level.
5.5 CAST-IN-SITU CONCRETE CHUTES ON SIDE SLOPES OF FILLS AND CUTS. Cast-in-situ concrete chutes on side
slopes of fills and cuts together with the inlet and outlet structures, shall be constructed in
accordance with the drawings. The grade of concrete shall be as indicated on the drawings. If so
required by the Engineer, a concrete screed shall first be cast in excavations that cannot be accurately
trimmed. The screed shall be accurately finished to the level of the underside of the chute invert slab
and allowed to set before the invert slab is cast. Where the material being excavated cannot be
accurately trimmed, or where chute sides have to extend above the surface of cut slopes, the outer faces
of the sides shall be cast against formwork.
5.6 CONCRETE-LINED OPEN DRAINS. Where so specified in the project specification and scheduled, the surfaces
on which a concrete lining is to be cast shall, after being trimmed, be covered with a sprayed bitumen
emulsion primer or polyethylene sheeting of nominal thickness 0,25 mm, all joints in the sheeting being
overlapped at least 150 mm. Care shall be taken not to damage the bitumen layer or the polyethylene
sheeting (as relevant) during the placing of reinforcement and during concreting.
Joints in concrete shall be sealed and shall comply with the relevant requirements given in the project
specification or on the drawings, or both. The lining shall be cast in alternate panels and, after the
concrete in the alternate panels has set, the exposed end surfaces shall be painted with bituminous
emulsion as specified in 5.4 for kerbing, channelling, and edging, before the intermediate slabs are
cast.
The exposed surfaces of the concrete linings of open drains shall be given a woodfloat surface finish and
the concrete shall be cured as specified in SABS 1200 G or SABS 1200 GA, as applicable.
5.7 BRICK-ON-EDGE KERBING. Except that the width of joints shall not exceed 12 mm, brick-on-edge kerbing
shall be laid and bedded in the manner specified in 5.2, and in such a way that the upper surface is
flush with the surface of the sidewalk.
5.10 PROTECTION. Care shall he taken during transporting and laying to protect all precast units against
chipping and breakage. Broken or badly chipped sections shall not be used and shall be removed from the
Site and replaced with undamaged units.
Concrete kerbing and channelling as well as other structures adjacent to the road shall be protected from
discoloration when bitumen is being sprayed or asphalt is being placed. Where bitumen is to be sprayed,
all kerbing and channelling shall he completely covered with polyethylene sheeting of thickness at least
0.25 mm or with other acceptable sheeting and anchored with stones and sand to prevent the sheeting from
lifting during windy conditions. Work that has become discolored by bitumen shall be broken down and
replaced, unless all such bitumen is so removed that no discoloration is visible. Painting over
discolored sections will not be acceptable.
5.11 TRANSITION SECTIONS AND INLET AND OUTLET STRUCTURES. Transition sections of kerbing, kerbing channelling
combinations, and concrete-lined channels shall, as far as is practicable, be constructed to the same
standards and using the same methods specified for uniform sections. Such sections may be either precast
or cast-in-situ units.
Inlet and outlet structures may be of precast or partially precast concrete units or they may be of
cast-in-situ concrete. Components such as grids, covers, and frames shall comply with the details shown
on the drawings and with the requirements of the project specification.
5.12 KERBSIDE STORMWATER CATCHPITS AND INLETS. The relevant requirements Of SABS 1200 LE shall apply to
stormwater catchpits and inlets.
6. TOLERANCES
6.1 CONCRETE'KERBING AND CHANNELLING. Concrete kerbing and channelling shall be so constructed as to present
straight lines and smooth curves that are acceptable to the Engineer and the dimensions and alignments
shall be within the following tolerances:
Permissible deviation, mm
Degree of accuracy
Item
I
a) Horizontal alignment
1) Deviation of any edge, centreline, or vertical surface
from specified position ..................................
2) Deviation of any edge, centreline, or vertical surface
from specified alignment, when taken over any section of
lenqth exceedinq 10 m ....................................
b) Gert.ica1 alignment and level
1) Deviation of inside edge of channelling from designated
finished road level ......................................
2) Deviation of invert level of each channel and drain and
0, -10
6.2 CONCRETE-LINED CHANNELS AND CONCRETE CHUTES. Concrete-lined channels and concrete chutes shall be
constructed to within the following tolerances:
Permissible deviation, mm
Degree of accuracy
Item
I I I1 I11
a) Horizontal alignment
Deviation of each channel and chute trom the specified
msition of each edqe or the centreline
b) Vertical alignment
.................. * -+25 *
Invert level of any concrete-lined open channel from the
designated level, subject to there being no adverse grade. * -+25 *
c) Trueness of exposed surfaces
Surface irregularities on each exposed surface when tested
with a 3 m straight edge .................................
d) Cross-sectional dimensions
* -+10 *
1) Cross-sectional dimensions related to specified
dimensions, except that any thickness of m r e than 10 mm
in excess of the specified thickness may be disregarded ... *
2) Average thickness of any invert or side slab related to
specified thickness (applicable to any complete slab or
any slab section having a surface area of 10 m2 or more). . I (NO upper limit:
1 Stated in project specification, if required.
7. TESTING
7.1 PRECAST KERBS. The Engineer may order any precast kerb units that have been delivered or installed and
that do not appear to him to be of the same quality as the approved samples (see 3.21, to be inspected
and tested in accordance with SABS 927.
9 SABS 1200 MK-1983
Kerbing and channelling
7.3 RESPONSIBILITY FOR COSTS OF TESTING, ETC. In the case of tests carried out in terms of 7.1 or 7.2. as
applicable, the cost of preparing test specimens, testing, and making good shall be borne
a) by the Contractor if the results of the test show that the material represented by the test sample
does not comply with the requirements of the specification; and
b) by the Employer if the results of the test show that the said material complies with the said
requirements.
-
NOTE: For the purposes of determining "additional subbase" for extruded-in-situ kerbing, the width of
subbase measured and paid as subbase in terms of Clause 8 of SABS 1200 ME will extend to 0,5 m behind the
front face of the kerb.
8.2.2 Concrete Kerbing and Channelling C o m b b (Grade of concrete indicated for cast-in-situ concrete and type
and figure or drawing number stated) .................................................... Unit: m
a) Straight and curved kerbing and channelling will be measured separately in the categories set out in
3.2.
b) The rate shall cover the cost of all the applicable operations specified in 8.2.l(b), (c),and (e).
8.2.3 Variation of Tests on Extruded Kerbinp (see 7.2.1 and 8.2.1)
a) Transverse strength test (provisional)................................................ Unit: No.
b) Set of 3 cubes (provisional).......................................................... Unit: No.
c) Set of 3 cores (provisional).. ........................................................ Unit: NO.
A test the results of which show that the kerbing fails to comply with the requirements of the
specification, will not be measured for payment.
In the case of (a) above, adjustment of compensation will be made as follows:
1) As a payment to the Contractor under (b) or (c) above in respect of each set of 3 cube tests or set of
3 core tests, as applicable, that have been ordered in writing by the Engineer; and
2) As a refund by the Contractor in respect of each reduction in the number of tests below 6 per l o o 0 m
of kerbing or channelling as specified in 7.2.1, regardless of whether such decrease results from a
decrease in the frequency ordered by the Engineer or from faulty workmanship on the part of the
Contractor.
The unit rate shall cover all costs of preparing a test specimen or a set of 3 specimens, as applicable,
testing, and making good.
8.2.4 Depressed Kerbs ......................................................................... Unit: m
Depressed kerbs will be measured linearly from the start of the depression to the point at which the kerb
returns to its normal height, and will be paid for as an extra-over on kerbing of normal height.
The unit rate shall cover the cost of all labour, material, and other things necessary for the extra
depth of excavation, concrete, and special setting.
8.2.5 Chutes ..................................................................................
Chutes will be measured linearly on the slope.
Unit: m
The rate shall cover the cost of all the applicable operations specified in 8.2.1.
8.2.6 Ancillaries
8.2.6.1 Inlet, outlet, transition, and similar structures (measured as unit structures - refer to type drawinq
for structure and grade of concrete) ........................................... Unit: No.
The unit rate shall cover the cost of all excavation, trimming, formwork, concrete, backfillinq, and
removal of excess material, and also such accessories as grids, etc., as may be detailed on th; type
drawing.
SABS 1200 MX-1983 10
Kerbing and channelling
The rate shall cover the cost of supplying the materials, labour, formwork, and incidentals necessary to
complete the joint as shown on the drawings or specified in the project specification.
8.2.11 Concrete Screed or Backfill Below Chute (grade of concrete stated) ......................
Unit: m 3
The volume measured for payment will be that of the concrete screed or backfill ordered by the Engineer
and placed below chutes.
The rate shall cover the cost of procuring, furnishing, and placing the concrete screed or backfill, as
applicable.
8.2.12 Steel Reinforcement ..................................................................... Unit: t
Measurement and payment will be in accordance with the provisions of SABS 1200 G or SABS 1200 GA, as
applicable. 2
8.2.13 sprayed Bitumen Emulsion Primer or Polyethylene Sheeting for Concrete-Lined Open Drains.. Unit: m
The area measured for payment will be that of the open drain to be concreted.
The rate shall cover the cost of procuring, furnishing, and applying the sprayed bitumen emulsion primer
or polyethylene sheeting, as scheduled.
., SABS 1200 MK-1983
Kerbing and channelling
ISBN 0-826-08784-7