| Summary: | This study is aimed at studying the effect of replacing natural tine aggregate (NFA) or natural sand with fine recycled concrete aggregate (FRCA) m producing high-strength cement-based mortar. Several mortar mixtures were produced by adding various FRCAs to the mixture in percentages of replacing 0%, 25%, 50%, 75%, and 100% of the NFA content. Properties of fresh (slump test) and hardened (density, compressive strength, and flexural strength) mortars were evaluated. The physical characterization showed a higher fineness modulus, lower density, and higher absorption in the FRCA than the NFA. Thus, these results make the use of admixture crucial to maintaining the appropriate consistency for mortar mixtures. Results of the replacement amount study indicated that the mortars prepared using the FRCA present poorer behavior than mortars produced using the NFA. However, no adverse effects on the mechanical properties of mortar are observed when the FRCA are used as replacements at ratios of up to 25%.
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