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In order to improve the dimensional stability and mechanical performance of cement-based composites, the effect of an expansive admixture based on calcium sulphoaluminate (CSA) on the shrinkage and mechanical properties of strain-hardening cement-based composite (SHCC), which exhibits multiple cracks and pseudo strain-hardening behavior in the direct tension, is investigated. Polyethylene fibers reinforced SHCC mixtures with three levels (30, 70, and 100MPa) of compressive strength were compared through free shrinkage, compressive strength, flexural strength, and direct tensile strength measurements. The SHCC mixtures were cast with and without replacing 10% of Portland cement content with CSA admixture. According to test results, CSA admixture is effective in reducing shrinkage of SHCC material. SHCC mixture with CSA admixture exhibited a little higher strength than companion mixture without CSA admixture.

han-guk gujomul jindan yuji gwalli gonghakoe nonmunjip/journal of the korea institute for structural maintenance and inspection

Influence of Cement Matrix's Compressive Strength and Replacement of Expansive Admixture on the Mechanical Properties of Synthetic Polyethylene (PE) Fiber-Reinforced Strain-Hardening Cement-Based Composites (SHCCs)