Abstract
A comprehensive investigation concerning the mechanical properties and microstructural characteristics of ultra-high-performance concrete (UHPC) using different dosages of limestone calcined clay cement (LC3) and recycled fine aggregate (RFA) was conducted. Results demonstrated that the compressive strength using 15% LC3 and 30% RFA is comparable to the control group, and the tensile strength of UHPC using 30% LC3 is comparable to the control mix-ID. Incorporation of LC3 generates additional hydration products. The addition of LC3 improved the pore size distribution and reduced porosity. The results of nanoindentation testing showed that using LC3 and RFA improved the performance of interfacial transition zone, contributing to the achievement of considerable mechanical resistance. Finally, life cycle analysis revealed that using LC3 and RFA could reduce the environmental impact.
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