A method for the acceleration of the setting of portland - cement as well as in this case for suitable mixtures of

摘要

1295616 Cement compositions W R GRACE & CO 19 April 1971 [25 March 1970] 25330/71 Heading C1H The set of cement is accelerated by including 0À01-10% of a water soluble salt formed from formic acid and an amine. A retarder e.g. a carbohydrate, OH. carboxylic acid, lignosulphonate or the acid, borate, silicone, corn syrup glucose, sucrose C.M.C. or admixtures, can be present, as can sand and ballast.