The Influence of Volume Changes in Portland and Calcium Sulfoaluminate Binary Cement
The long-term volume changes of Portland-Calcium sulfoaluminate cement systems has been studied for samples cured under different conditions. Three curing conditions were chosen in this study and the composite cement systems showed different results with different CSA dosages. Progressively higher amount of CSA was added to the composite cement system and it was found that there was a critical dosage of CSA leading to unstable expansion and failure of the samples by curing under water. But in drying condition, the systems showed shrinkage and the degree of volume changes were similar than expansion by curing under water. By selecting the composition of CSA-PC systems and curing conditions, the volume stability of composite cement could be controlled.
KeywordsCalcium sulfoaluminate cement Binary cement Ettringite Volume change
This research was supported by Beijing Natural Science Foundation of China Project-Research on the key issues of the environmental performance of new energy-saving building materials evaluation and design (Grant No. 2141001) and PHR (IHLB) Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality.