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Influence of curing conditions on the mechanical performance of ultra-high-performance strain-hardening cementitious composites

Kim Min-Jae, Oh Taekgeun, Yoo Doo-Yeol

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 3

607--617

This study investigated the influence of curing conditions and the inclusion of ground granulated blast furnace slag (GGBS) on the mechanical performance of ultra-high-performance strain-hardening cementitious composites (UHP-SHCC). Air- and wet-curing conditions were applied for 28 and 91 days, respectively. Compressive strength and direct tensile tests were performed, and the microstructure of the tested cementitious matrix and surface of the polyethylene (PE) fibers were inspected using scanning electron microscopy. The results showed that 3 months of wet-curing notably deteriorated the tensile performance of UHP-SHCC with or without GGBS as compared to those at the curing age of 1 month, whereas the 3 months of air-curing further enhanced the tensile performance. Therefore, the 3 months air-cured specimens, using binders consisting only of ordinary portland cement (OPC) or OPC with GGBS, could develop the highest tensile strength and strain capacity of up to 12.1 MPa and 9.1% or 13.6 MPa and 9.1%, respectively. The inclusion of GGBS led to a higher rate of stress development as well as tensile strength at the air-curing age of 3 months, resulting in the highest energy absorption capacity of 985 kJ/m3 measured in this study.