EARLY-STRENGTH CEMENTITIOUS COMPOSITION AND POLYCARBONATE ADMIXTURE USED IN THE SAME

摘要

A polycarbonate based admixing additive for early strength expression type of cement composition is provided to endow favorable fluidity early strength to the cement composition, thereby producing high compression strength of concrete after concrete casting with use of the cement composition by combining different dispersing agents together in specific content ratios thereof to form the additive. The additive includes: 3-25wt.% of first dispersion agent; 3-25wt.% of second dispersion agent; 1-10wt.% of third dispersion agent; 1-10wt.% of fourth dispersion agent; and the balance of water. The additive is applied to typical Portland cement. The additive is effective to embody the early strength expression type of cement composition with flexibility for more than 2 hours for concrete casting process and compression strength of more than 5MP for 18 hours after the concrete casting of the cement composition at more than 8deg.C.