HARDENING ACCELERATOR FOR CEMENT

摘要

PROBLEM TO BE SOLVED: To obtain a hardening accelerator for cements capable of extremely rapidly setting and hardening a cement paste, a mortar or a concrete and raising the initial strength and long-term strength of the resultant hardened material. SOLUTION: This hardening accelerator for cements comprises a CaO-Na2 O- Al2 O3 -based baked material having a chemical composition of 54-65wt.% CaO, 5-20wt.% Na2 O and 21-40wt.% Al2 O3 expressed in terms of CaO, Na2 O and Al2 O3 and a CaO-Na2 O-Al2 O3 -based baked material containing >=50wt.% 8CaO.Na2 O.3Al2 O3 .