TamCem 8BFG is a special plasticiser/retarder for TBM backfill grouts and some concrete applications. It is a non-chloride liquid admixture formulated to give high water reduction, greater workability and extended open time to concrete and cementitious grouts. It is compatible with all cements meeting recognised international standards. It complies with the requirements of EN 934-2 and ASTM C 494 for Type B retarding admixtures.
TamCem 8BFG extends the hydration process by retarding both initial and final set times and enhances strength through cement particle dispersion. In TBM backfill grouts the setting and hydration control can be regulated using sodium silicate accelerators such as with TamShot 10SS.