Fosroc Conbextra EP75 constructive solutions

Creep resistant, high strength, epoxy resin grout

Properties

Uses Pot life : 75 minutes @ 23°C

Tensile strength
Provides a free flowing grout, for use where physical (ASTM C307) : 12 N/mm2 at 7 days
properties and chemical resistance of the hardened grout Flexural strength
are of utmost importance. It is suitable for a wide range of (ASTM C580) : 26 N/mm2 at 7 days
heavy duty applications including : Compressive strength : 85 N/mm2 at 1 day
Underplate grouting to substantial structural elements. @350 C (ASTM C579) 95 N/mm2 at 3 days
100 N/mm2 at 7 days
Base plate grouting in dynamic load situations such as
turbines and other reciprocating machinery. Maximum flow distance for a head of 100 mm at 20°C :
Heavy industrial applications in steelworks, refineries 35 mm gap - 2000 mm
chemical plants and electroplating works. 70 mm gap - 3500 mm
Coefficient of thermal expansion
Structural infill where very high strength is required. ASTM C531 : (2 - 5) x 10-5
Rail track applications, to support heavy cranes, or on Compressive creep
transporter rails. (ASTM C1181- 2.85N/mm²
1 year, 60°C) : 2.05 x 10-3 mm/mm
Advantages
Instructions for use
Creep resistant - to Improve resistance to deformation
under constant loading. Preparation

Excellent durability - high compressive, flexural and Underplate grouting

tensile strengths ensure a long working life. The unrestrained surface area of the grout must be kept to a
minimum. Generally, the gap between the perimeter formwork
Cost effective - high early strength gain promotes and the plate edge should not exceed 75 mm on the pouring
minimum downtime and early commissioning of plant. side and 25 mm on the opposite side. Formwork on the flank
User friendly - simple, full pack mixing to ensure that the sides should be kept tight to the plate edge. Air pressure relief
performance characteristics are achieved. holes should be provided to allow venting of any isolated high
spots.
Versatile - suitable for a wide range of loading situations
including repetitive dynamic loads. Formwork
The formwork should be constructed to be leak proof as
Excellent in service performance - non-shrink capability Conbextra EP75 is a free flow grout. This can be achieved by
ensures full surface to surface contact. using foam rubber strip or mastic sealant beneath the
constructed formwork and between joints.
Description
For free flow grout conditions, it is essential to provide a hydrostatic
Conbextra EP75 is a solvent free epoxy resin grout designed head of grout. To achieve this a feeding hopper should be used -
for grouting of gap widths of 10 to 75 mm. It is supplied as a please consult your local Fosroc office for more details.
three component system consisting of base, hardener and
specially graded aggregate. The components are supplied Foundation surface
in the correct mix proportions designed for whole pack mixing This must be free from oil, grease, or any loosely adherent
on site. material. If the concrete surface is defective or has laitence, it
must be cut back to a sound base. Bolt holes or fixing pockets
Specification must be blown clean of any dirt or debris.

Where shown on the contract documents, the epoxy grout Base plate
shall be Conbextra EP75 supplied by Fosroc. It shall provide If delay is likely before placing steel base plates, it is
Conbextra EP75

good general chemical resistance, 7 day compressive recommended that the underside and edge are coated with
strength of 100 N/mm 2 , and a compressive creep of Nitoprime 25* to prevent rust formation and ensure bonding with
2.05 x 10-3 mm/mm in accordance with ASTM C1181. the Conbextra EP75 grout. All metal surfaces should be cleaned
to a bright finish in accordance with Swedish Standard SA 2½ or
equal. Nitoprime 25 can be applied directly onto newly cleaned
steel surfaces even if they are damp.
Fosroc Conbextra EP75

Mixing (iii) Try to eliminate application in the middle of the day, and
certainly avoid application in direct sunlight.
The entire contents of the hardener can should be poured
(iv) Ensure that there are sufficient operatives available to
into the base container and mixed until homogeneous. Place
the mixed base and hardener into a suitable forced action complete application within the material’s pot life.
mixer making sure that the entire volume is poured in. Add
the aggregate and mix for 2-3 minutes or until uniform colour Estimating
is achieved. Once mixed, the material must be used within
Supply
the specified pot life (see under Properties). After this time,
Conbextra EP75 : 15 litre packs
unused material will have stiffened and should be discarded.
Nitoprime 25 : 1 and 4 litre packs
Note: Immediately prior to placement, all surfaces must be Fosroc Solvent 102 : 5 litre packs
dry.
Coverage
Placing Nitoprime 25 : 4.0 to 5.0 m2/litre
Ensure that the grout can be placed within its pot life.
Continuous grout flow is essential. Sufficient grout must be Storage
available prior to starting and the time taken to pour a batch
When stored in warehouse conditions below 35°C, Conbextra
must be regulated to the time taken to prepare the next one.
EP75 will have a shelf life of 12 months.
Pouring should be from one side of the void to eliminate air
entrapment. The hydrostatic head must be maintained at all
Precautions
times so that a continuous grout front is achieved.
Health and safety
Cleaning
Some people are sensitive to epoxy resin so gloves and a
All tools and equipment should be cleaned immediately after
barrier cream such as Kerodex 71, Rozalex 9, Debba-Wet
use with Fosroc Solvent 102*.
Work or similar should be used when handling these products.
Limitations If contact with the resin occurs, it must be removed before it
hardens with a resin removing cream such as Kerocleanse
- For underplate grouting, failure to adhere to “Instructions 22 or Rozalex 42. Follow by washing with soap and water.
for use”, may result in cracking & edge uplifting. Do not use solvent. The use of goggles is recommended but
Hot weather working should accidental eye contamination occur, wash thoroughly
with plenty of clean water and seek medical treatment
Whilst the performance of Conbextra EP75 at elevated immediately.
temperatures is assured, application under such conditions
can sometimes be difficult. It is therefore suggested that, for Fire
temperatures above 35°C, the following guidelines are used:
Nitoprime 25 and Fosroc Solvent 102 are flammable.
(i) Store unmixed materials in a cool (preferably temperature
controlled) environment, avoiding exposure to direct Flash points
sunlight. Nitoprime 25 : 39°C
(ii) Keep mixing and placing equipment cool, arranging Fosroc Solvent 102 : 33°C
shade protection if necessary. It is especially important
to keep cool those surfaces of the equipment which will
* Denotes the trademark of Fosroc International Limited
come into direct contact with the material itself. †
See separate data sheet

Important note
Fosroc products are guaranteed against defective materials and manufacture and are sold subject to its standard Conditions for
the Supply of Goods and Service. All Fosroc datasheets are updated on a regular basis. It is the user’s responsibility to
obtain the latest version.

Head Office
telephone: (+9714) 2039699 fax: (+9714) 2859649 email: agf@fosroc.com
Al Gurg Fosroc LLC
Regional offices
Post Box 657, Dubai Abu Dhabi, Al Gurg Fosroc telephone: 673 1779 fax: 673 1449 email: abudhabi@fosroc.com
United Arab Emirates Bahrain, YBA Kanoo telephone: 17738200 fax: 17732828 email: bahrain@fosroc.com
Kuwait, Boodai telephone: 4817618 fax: 4832124 email: kuwait@fosroc.com

www.fosroc.com
Oman, Al Amana telephone: 24815080 fax: 24817554 email: oman@fosroc.com
Qatar, Tadmur telephone: 4432365 fax: 4419517 email: qatar@fosroc.com

UAE/0239/11/K