Mechanical Properties of Self-Compacting Concrete with Used Engine Oil as an Admixture and Rice Husk Ash and Sawdust Ash as Cement Substitutes

Volume Title: ICASGE2025

Paper ID : 1048-ICASGE-FULL

Civil Engineering Department, Faculty of Engineering, Bayero University, Kano, Nigeria

This study investigates the effects of sawdust ash (SDA) and rice husk ash (RHA) as cement substitutes on the mechanical properties of self-compacting concrete (SCC) using used engine oil (UEO) as a chemical additive. In order to produce eight (8) different mixes, RHA was used in place of cement by weight at percentages of 0%, 5%, 7.5%, and 10%. Additionally, with a consistent UEO of 0.5%, SDA simultaneously substitutes cement elements by weight at 0% and 5%. Slump flow and passing ability were the fresh properties of the self-compacting concrete (SCC) that were considered. At the same time, compressive strength and splitting tensile strength were the hardened properties. According to the experimental findings, the addition of RHA and SDA reduced SCC's slump flow and passing ability. In a similar vein, RHA and SDA strengthened the SCC; however, at greater percentage replacement levels than 10% RHA and 5% SDA, the opposite may be true. Furthermore, RHA and SDA improved the mechanical properties of the SCC; however, the opposite might be apparent at higher replacement levels than 10% RHA and 5% SDA. When compared to the control mix, the results of the compressive and splitting tensile strength tests revealed that the 0.5% UEO addition had no detrimental effects.

Self-Compacting Concrete; rice husk Ash; sawdust ash; used engine oil; mechanical properties