The effect of mixing rice husk ash and palm oil boiler ash on concrete strength

Abstract

Physical properties such as compressive strength and tensile strength of concrete can be changed by adding a mixture of rice husk ash and palm oil boiler ash in concrete. The rate of absorption of water by the concrete mixed with rice husk ash and mixed with palm oil boiler ash was further tested. Levels addition of the mixture to be tested is 5%, 10%, 15% , and 20% by long immersion for 7 days, 14 days, 21 days, 28 days, and 60 days. Tests on the compressive strength and modulus of elasticity of concrete from a wide variation in the mixture, analyzed by XRD (X - ray diffractometry). Analysis of the surface morphology and content of elements contained in the sample of natural bentonite, used Scanning Electron Microscopy (SEM). The test results showed the addition of a mixture of rice husk ash, palm oil boiler ash , and the addition of a mixture of both, ideal on concrete that has the addition of a mixture of 5% composition. With the addition of the concrete mix results in a SiO2 content of the concrete is reduced. Significant content of SiO2 is with a mixture of 5% rice husk ash. Compressive strength and modulus of elasticity of concrete with rice husk ash mixture 5% higher than the others.