2017 Volume 71 Issue 1 Pages 154-160
Supplementary cementitious materials（SCMs）especially fly ash（FA）can play significant role in reducing CO2 emission produced by the cement industry and improving waste management by recycling the industrial waste exhausted from coal fired power plants. However, FA cement has the lower initial strength than that of ordinary Portland cement（OPC）. In order to improve this problem, high C3S cement（HAC）and limestone powder（LSP）was used instead of OPC in FA cement in this study. HAC, FA and LSP blended cement（HAC-FA-LSP）was reported that it had the same compressive strength as OPC at 3 to 56 days of age. However the hydration reaction of HAC-FA-LSP is not investigated enough. In this paper, the hydration product and pore size distribution of HAC-FA-LSP is revealed. The study findings indicate that the amount of monosulfate is decreased. Hemicarbonate and monocarbonate is formed in HAC-FA-LSP. And according to MIP measurement, the porosity of HAC-FA-LSP at 7days aged is decreased compared with OPC-FA. However, HAC-FA-LSP at 28day and 91days aged have no significant change on pore distribution compared with OPC-FA.
