| Summary: | This study aims to determine the optimal percentage of Rubberized Engineered Cementitious Composite (RECC) as fine aggregate replacement in mortar. Various percentages of crumb rubber with 0%, 5%, 10%, 15%, and 20% are used as a partial replacement of fine aggregate. The mortar was subjected to a compressive strength test to evaluate crumb rubber strength performance with varying percentages. The mortar specimen was examined to determine the optimal percentages of Engineered Cementitious Composite (ECC) containing variable percentages of crumb rubber as a partial fine aggregate replacement for 7, 14, and 28 days. The compressive strength test was used until the ECC failed. This study has been carried out using 54 sample mortar cubes with 50 mm cube specimen sizes. As a result, of increased crumb rubber addition into ECC, the compressive strength was significantly reduced, which could be attributed to the low stiffness of crumb rubber and the expanded closing pores in the cement paste. The performance of RECC as a mortar improves in terms of energy dissipation and ductility as used in the compressive strength test. The optimal percentage of crumb rubber as replacement partial fine aggregate is 5%. © 2023 Institute of Physics Publishing. All rights reserved.
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