TamCem R-TBM is a special retarder/plasticiser for TBM backfill grouts. It is a non-chloride liquid admixture formulated to give 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 R-TBM 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 silicate accelerators such as TamShot 10SS.