PEMANFAATAN ABU SEKAM PADI 10% SEBAGAI SUBSTITUSI SEMEN DAN LIMBAH KACA SEBAGAI SUBSTITUSI AGREGAT HALUS PADA CAMPURAN BETON MUTU fc’ 25 MPa

Abstract

Ridhwan Muhammad Iqbal. 104116025. Utilization of 10% Rice Husk Ash as Cement Substitution and Glass Waste as a Substitution of Fine Aggregates in Concrete Mixtures with fc '25 MPa Quality. This final project discusses the use of glass waste powder from a mixture of glass bottle colors as a substitute for fine aggregate and rice husk ash as a substitute for cement. The research was conducted by making a mix design from normal concrete fc'25 MPa and developed on four variations of the mixture with the amount of glass powder 0%, 10%, 20%, and 30% with the use of 10% rice husk ash. The test conducted is the effect of the substitution material on the compressive strength and characteristics of the concrete including workability, crack patterns, and adhesions of concrete aggregates. The compressive strength test was carried out at the age of 7, 14, and 28 days. From the results of the compressive strength test, the optimum value of the concrete variations occurs in a mixture of 20% glass powder and 10% rice husk ash, but the resulting value is still below normal concrete. The use of substitution materials also affects the value of the workability of concrete and from visual observation of the crack pattern and the aggregate attachment, the weakest point tends to occur in the bond between concrete aggregates.

Key words: Glass waste, Rice husk ash, Compressive strength, Crack pattern, Aggregate attachment