The research on high strength cement compounded with superfine powder of limestone and GGBS

According to the orthogonal design method, various samples of P (.) I 42.5 Portland cement with proportions of with superfines of limestone powder, GGBS powder and fly ash were designed; the grain-size distribution was calculated with RRSB linear regression, and the physical performance of the samples was tested. The research results indicated the addition of limestone superfines and GGBS can improve the grain-size distribution significantly, increase the content of superfines, and increase the strength of whole ages. With 60% of P (.) I 42.5 Portland cement, 6% of superfines of limestone, 30% of GGBS, 4% of fly ash, a high compressive strength cement can be mixed with the compressive strength of 38.5 MPa, 71.2 MPa and 76.5 MPa at 3d, 28d and 90d respectively. As compared to P (.) I 42.5 Portland cement, the compressive strength increased 7 MPa, 10 MPa and 13 MPa at 3d, 28d and 90d respectively.