Description
Description
Conbextra EP75 is a solvent free epoxy resin grout designed for grouting of gap widths of 10 to 75 mm. It is supplied as a
three component system consisting of base, hardener and specially graded aggregate. The components are supplied in
the correct mix proportions designed for whole pack mixing on site.
Uses:
Provides a free-flowing grout, for use where physical properties and chemical resistance of the hardened grout are
of utmost importance. It is suitable for a wide range of heavy-duty applications including.
■ Under plate grouting to substantial structural elements.
■ Base plate grouting in dynamic load situations such as turbines and other reciprocating machinery.
■ Heavy industrial applications in steelworks, refineries, chemical plants and electroplating works.
■ Structural infill where very high strength is required.
■ Rail track applications, to support heavy cranes, or on transporter rails.
Advantages:
■ Excellent durability – high compressive, flexural and tensile strengths ensure a long working life.
■ Cost effective – high early strength gain promotes minimum downtime and early commissioning of machinery.
■ User friendly – simple, full pack mixing to ensure that the performance characteristics are achieved.
■ Versatile – suitable for a wide range of loading situations including repetitive dynamic loads.
■ Excellent in service performance – non-shrink capability ensures full surface to surface contact.
Technical Support:
Fosroc offers a comprehensive range of high quality, high performance construction products. In addition, Fosroc offers
a worldwide technical support and on-site service to specifiers, end-users and contractors.
Specification Clauses:
Where shown on the contract documents, the epoxy grout shall be Conbextra EP75 supplied by Fosroc. It shall provide good general chemical resistance, and a 7-day compressive strength of at least 100 N/mm2.
Instructions for Use
Preparation
Under plate grouting
The unrestrained surface area of the grout must be kept to a minimum. Generally, the gap between the perimeter
formwork and the plate edge should not exceed 150mm on the pouring side and 50 mm on the remaining sides. In
specific thin section applications, the flank side formwork should be kept tight to the base plate. Air pressure relief
holes should be provided to allow venting of any isolated high spots.
Formwork
The formwork should be constructed to be leak proof as Conbextra EP75 is a free flow grout. This can be achieved
by using foam rubber strip or mastic sealant beneath the constructed formwork and between joints. For free flow grout
conditions it is essential to provide a hydrostatic head of grout. To achieve this a feeding hopper should be used –
please consult your local Fosroc office for more details.
Foundation surface
This must be free from oil, grease, or any loosely adherent material. If the concrete surface is defective or has laitance, it
must be cut back to a sound base. Bolt holes or fixing pockets must be blown clean of any dirt or debris.
Base plate
If delay is likely before placing steel base plates, it is recommended that the underside and edges are coated with
Nitoprime 25* to prevent rust formation and ensure bonding with 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.
Mixing
Conbextra EP75 can be mixed by electric machines in plastic pail. Thoroughly power-mix Base and Hardener and
add in Filler. Continue power mixing until all fillers are uniformly mixed with binder to form a homogeneous grout
consistency. Once mixed, the material must be used within the specified pot life (see under Properties). After this time,
unused material will have stiffened and should be discarded.
Note: *Immediately prior to placement, all surfaces must be dry.
Placing
Ensure that the grout can be placed within its pot life. Continuous grout flow is essential. Sufficient grout must be
available prior to starting and the time taken to pour a batch must be regulated to the time taken to prepare the next one.
Pouring should be from one side of the void to eliminate air entrapment. The hydrostatic head must be maintained at all times so that a continuous grout front is achieved. Cleaning All tools and equipment should be cleaned immediately after
use with Fosroc Solvent 102.
Hot Weather Working
Whilst the performance of Conbextra EP75 at elevated temperatures is assured, application under such conditions
can sometimes be difficult. It is therefore suggested that, for temperatures above 35ºC, the following guidelines are used:
Store unmixed materials in a cool (preferably temperature controlled) environment, avoiding exposure to direct sunlight.
Keep mixing and placing equipment cool, arranging shade protection if necessary. It is especially important to keep cool
those surfaces of the equipment which will come into direct contact with the material itself. Try to eliminate application in the middle of the day, and certainly avoid application in direct sunlight. Ensure that there are sufficient operatives available to complete application within the material’s pot life.
Storage:
When stored in warehouse conditions below 35ºC, Conbextra EP75 will have a shelf life of 12 months.
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