ACCELERATOR FOR CONCRETE TO SHORTEN CURING TIME OF CONCRETE AND TO REDUCE TOXICITY

摘要

PURPOSE: An accelerator for concrete is provided, which can shorten curing time of the concrete by improving instability of sodium aluminate and delay of curing time and high rebound amount of sodium silicate and can reduce toxicity harmful to human bodies. CONSTITUTION: The accelerator for concrete is aluminum sodium silicate(Na¬nAl¬y(SiO4)¬k) having a concentration of aluminum oxide of 10-25%, a concentration of sodium oxide of 10-25%, and a concentration of silicone oxide of 0.001-10%. And the aluminum sodium silicate is produced by reacting 40-65wt% of sodium hydroxide having a concentration of sodium oxide of 30-50%, 31.5-50wt% of aluminum hydroxide having a concentration of aluminum oxide of 50-68%, 0.01-10.0wt% of sodium silicate having a concentration of silicone oxide of 10-30%, and 0.5-30wt% of water at 100-150deg.C for 30-120min.