Q.: A manufacturer recommended that we use the company's sodium silicate curing agent for curing the tops of walls. The representative claimed that it has an advantage over other curing agents because, if it happens to be sprayed onto reinforcement, it doesn't break the bond. He also said that it doesn't prevent bond to any cementitious toppings subsequently applied to concrete. Are these claims true? We had always considered sodium silicate curing agents to be inferior.
A.: We believe the company representative's claims are true. Your impression that sodium silicate curing agents are inferior perhaps relates to test data that have shown better concrete strength results from other types of curing agents. In some circumstances the considerations brought out by your manufacturer's representative may be more important than the amount of strength development.