Applications include bed grouting, duct grouting, non-shrink infilling and jointing. Advantages Gaseous expansion system compensates for plastic shrinkage and settlement in properly designed cementitious grout. No metallic iron content to corrode and cause staining or deterioration due to rust expansion in the grout. Composition allows high early strength development in grouts, without the use of chlorides.
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Typical applications would be the grouting of base plates of turbines, compressors, boiler feed pumps etc. These include masts, anchor bolts and fence posts. Advantages Gaseous expansion system compensates for shrinkage and settlement in the plastic state No metallic iron content to cause staining Pre-packed material overcomes onsite batching variations Develops high early strength without the use of chlorides High ultimate strength ensure the durability of the hardened grout Free flow ensures high level of contact with load bearing area Description Conbextra GP2 is supplied as a ready to use dry powder.
The addition of a controlled amount of clean water produces a free flowing, non-shrink grout for gap thicknesses up to mm. Conbextra GP2 is a blend of Portland cement, graded fillers and chemical additives which impart controlled expansion in the plastic state whilst minimising water demand. The low water demand ensures high early strength. The graded fillers are designed to assist uniform mixing and produce a consistent grout. Application instructions Preparation Foundation surface The substrate surface must be free from oil, grease or any loosely adherent material.
If the concrete surface is defective or has laitence, it must be cut back to a sound base. Bolt holes and fi xing pockets must be blown clean of any dirt or debris.
Pre-soaking Several hours prior to placing, the concrete substrates should be saturated with fresh water. Immediately before grouting takes place any free water should be removed with particular care being taken to blow out all bolt holes and pockets. Base plate It is essential that this is clean and free from oil, grease or scale.
Air pressure relief holes should be provided to allow venting of any isolated high spots. Levelling shims If these are to be removed after the grout has hardened, they should be treated with a thin layer of grease.
Formwork The formwork should be constructed to be leakproof. This can be achieved by using foam rubber strip or mastic sealant beneath the constructed formwork and between joints. In some cases it is practical to use a sacrifi cial semi-dry sand and cement formwork. The formwork should include outlets for pre-soaking. Mixing and placing For best results a mechanically powered grout mixer should be used.
When quantities up to 50kg are used, a heavy duty slow speed drill rpm fi tted with a paddle is suitable. Larger quantities will require a heavy duty mixer. Other details Max.
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You are on page 1of 4 Search inside document Conbextra GP2 4S General purpose, free flow, high strength, nonshrink, cementitious grout Uses Conbextra GP2 4S is used for general purpose grouting where it is essential to eliminate shrinkage when completely filling the void between a base plate and a substrate. Such an application would be the grouting of a stanchion base plate. It can also be used for anchoring a wide range of fixings. These include masts, anchor bolts and fence posts. The addition of a controlled amount of clean water produces a free flowing, non-shrink grout for gap thicknesses up to mm. Conbextra GP2 4S is a blend of Portland cement, graded fillers and chemical additives which impart controlled expansion in the plastic state whilst minimising water demand.
Fosroc Construction Chemicals
Fosroc Conbextra GP2