Agent increasing the hardening rate of cements, mortars and concretes, while maintaining their workability.

摘要

An agent for increasing the speed of hardening of cements, mortar and concrete whilst maintaining their workability which corresp. to the general formula (I) where R1, R2 and R3 are H, alkyl (opt. substd.), alkene, aryl or aralkyl; -B is a hydrocarbon chain comprising at least one -CH2- gp. having 10 or less C atoms. -A is NR5R6, NH(+)R5R6 X(-) or -NR5R6R7 X is halide, nitrate, nitrite, sulphate, sulphite, thiosulphate, acetate, adipate, citrate, gluconate, para-torylate, formate, propionate phosphate, borate, thiocyanate or sulphonate; (halide is pref.) and R3-R6 and R7 are alkyl (opt. substd.), alkene, aryl or aralkyl. Cement, mortar and concrete compsns. contg. the additives described are also claimed.