Developing energy efficient mortar with added rice husk, jute fiber, or coconut fiber ashes

This study has investigated the impact of Rice Husk Ash (RHA), Jute Fiber Ash (JFA), and Coconut Fiber Ash (CFA) on the mechanical properties and thermal performance of the ash-incorporated modified mortar. It aims to find an optimum ash content that can improve energy efficiency without compromising the mechanical strength of mortar. Workability, thermal, and mechanical properties of the modified mortar were observed by partially replacing the cement with RHA, JFA, and CFA in the proportions of 5%, 10%, and 15%, respectively. The fresh property was investigated by a slump flow test following the ASTM C-143. This study tested the thermal conductivity of mortar using Hukseflux and energy performance utilizing whole-building energy simulations using eQUEST. Compressive and tensile strength tests were performed following ASTM standards after 7, 14, and 28 days. The thermal conductivity of mortar decreases with increasing ash content. The test results also indicate a decrease in mechanical properties with the increase in the percentage of ashes. The maximum compressive strength for RHA, JFA, and CFA incorporated mortar were 20.39 MPa, 18.32 MPa, and 20.96 MPa, respectively, for 5% replacement of cement at 28 days. Similarly, the maximum tensile strength of RHA, JFA, and CFA incorporated mortar were 1.48 MPa, 1.65 MPa, and 1.66 MPa, respectively, for 5% replacement of cement at 14 days. According to the results, a 5% replacement of cement with RHA produces optimal energy efficiency and ensures reasonable mechanical strength.