Self-compacting Concrete Using Eggshell Ash and Rice Husk Ash as Partial Cement Replacement

The usage of self-compacting concrete (SCC) is highly recommended in heavy construction as it helps to ease concreting process during construction and improves productivity, energy consumption, as well as the working environment. This research study is to show the efficiency of self-compacting concrete made of waste products as cement replacement. Concrete structure is becoming a vital element in the construction industry, hence the increase in cement demand. As proven in various studies, cement production leads to environmental pollution. Thus, a new material made up of waste material is proposed as a partial cement replacement in concrete. The percentage of cement content in SCC will be reduced by replacing it with eggshell ash (ESA) and rice husk ash (RHA) in the mix design mainly to improve the concrete strength. Thus, the optimum percentage of RHA and ESA will be determined throughout this research. Several tests were conducted to test the mechanical and physical properties of the specimen and comparing with the SCC control. It was proven that SCC with 3% ESA 8% RHA produced maximum strength compared to the control and other design mixes with 0%, 6%, and 9% ESA, respectively. The increment of 14.31% compressive strength on the 28th day compared to the control mix has created the optimum silica and calcium hydroxide reaction for the hydration process.