Study on the Strength, Permeability, and Drying Shrinkage of Mortar with Portland Cement and Sulphoaluminate Cement

Abstract

Adding sulphoaluminate cement (SAC) to Portland cement (PC) can affect the growth of hydration products and further affect the properties of the matrix. In this paper, the influence of SAC content on the impermeability, drying shrinkage and strength of mortar was studied by replacing PC with no more than 20% SAC. The results show that with the increase of SAC content, acicular ettringite (AFt) in cement stone gradually decreases, the compressive and flexural strength of mortar decreased first and then increased, and the strength was lowest when the content of SAC was 10%. The addition of SAC intensified the drying shrinkage of mortar. The greater the amount of SAC added, the higher the dry shrinkage value and the worse the impermeability of mortar.