Influence of Gypsum on Hydration and Hardening Performance of Limestone Powder in Cement Based Material
LIU Juanhong1, LI Kang1, SONG Shaomin2, BIAN Libo1,2
1 College of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083; 2 School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044
Abstract: Focusing on the problem of serious cracking of concrete under non-load, this paper presents a cementitious material system which composed by cement clinker with low specific surface area, mineral admixtures with high specific surface area and gypsum with high dosage. The influence of limestone powder and gypsum on hydration and hardening micro-structure of cement based cementitious material was studied by hydration rate test, X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and thermal gravimetric-differential scanning calorimetry (TG-DSC). The results showed that limestone powder accelerated the react of C3A and gypsum to generate ettringite. In the presence of a sufficient amount of gypsum, limestone powder could hinder the transformation of ettringite to low-sulfur type hydrated calcium sulphoaluminate. The incorporation of limestone powder and gypsum further delayed the hydration of C3A. In the case of coexistance of enough limestone powder and gypsum, C3A hydrated to generate hydrated carbon calcium aluminum with expansion property and high-sulfur type hydrated calcium sulphoaluminate, which compensated the shrinkage and improved crack resistance of cement based materials. C30 and C50 concrete prepared with the cementitious material composed by coarse grinding clinker, fine grinding mineral admixtures and gypsum with high dosage had momentum of increasing compressive strength continuously. The strength increased by 36.7% and 33.3% respectively from 28 days to 180 days. The concrete had close structure, low porosity and less content of harmful hole.
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