Bostik Plasticized Expanding Grout Admixture

Grout Admix, a plasticized expanding grout admixture is supplied as a powder. The material is a combination of a plasticizing agent and a gas producing expansion medium. The plasticizing agent allows the use of a reduced water/ cement ratio with consequent increased strengths and durability. The expansive medium counteracts the natural settlement and plastic shrinkage of the grout and aids stability and cohesion.
Features :
- Gaseous expansion system compensates for plastic
- shrinkage and settlement in properly designed cementitious grout.
* Reduced water/cement ratio mixes in the grout mix
* ensures low permeability and long term durabiservice.
* Gives grout high fluidity with low water/cement ratio thus making placement or injection of the grout easy.
* 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.
RECOMMENDED USES :
Grout Admix is an admixture for cementitious grouts where a reduced water/cement ratio & positive expansions are required. Applications include bed grouting, duct grouting, non-shrink infilling & jointing.
APPLICATION PROCEDURE :
Performance Specification :
All grouting (specify details & areas of application) must be carried out with a cement based grout incorporatinga plasticised, expanding powder admixture. The grout admixture must be iron-free and chloride-free and shall be added to the cement grout in the proportion of 225g per 50kg of cement. The grout admixture shall provide an expansion of up to 4% in the plastic grout, by means of a gaseous system. The grout admixture must be stored, handled & mixed strictly in accordance with the manufacturer's instructions.
Mixing :
For best results a mechanically powered grout mixer must be used. For quantities upto 50kg, a slow speed drill fitted with a hig shear paddle is suitable. Large quantities will require a high volume drum mixer. It is essential that machine mixing capacity and labour availability is adequate to enable the grouting operation to be carried out continuously. This may require the use of a holding tank with provision for gentle agitation to maintain fluidity. The selected water content should be accurately measured into the mixer. The cement (and sand if required) shall be slowly added to Grout Admix. Mixing shall be continued for 5 minutes, making sure that a smooth even consistency is obtained.
Application :
It shall be ensured that areas to be grouted are clean, sound, and then pre-wetted. The unrestrained surface area of the grout must be kept to a minimum. The grout shall be placed within 20 minutes of mixing to gain the full benefit of the expansion process. Usual placing or pumping procedures shall be adopted ensuring a continuous operation.
NOTE : Grout Admix is incompatible with High Alumina Cement For grout, mortar or concrete mixes with an aggregate/ cement ratio more than 1, 4 x 225 g units of Grout Admix per 100 kg of cement, shall be used. Effects of overdosing Drastic overdosing of Grout Admix increases expansion and may cause frothing.
CLEANING :
Grouts mixed with Grout Admix should be removed from tools and equipment with clean water immediat- ely after use. Cured material should be removed mechanically or with multi purpose cleaning agent.
PACKING :
Grout Admix is supplied in 225 g packs
STORAGE & SHELF LIFE :
Grout Admix has a shelf life of 6 months if kept in a dry store in its original packing. High temperature and humidity storage may reduce this period.
HEALTH & SAFETY :
Grout Admix is of low hazard.