Pengaruh Penggunaan Bottom Ash sebagai Pengganti Pasir terhadap Kuat Tekan Beton Mutu Tinggi pada Berbagai Umur Beton

Abstract

This study aims to evaluate the effect of using bottom ash as a substitute for sand on the compressive strength of high-quality concrete at various concrete ages. Bottom ash, Bottom ash used in this study was taken from the Pangkalan Susu PLTU, as a by-product of coal combustion, is expected to be used as a substitute material in concrete mixtures to reduce dependence on limited natural raw materials. The method used in this study is experimental with test objects made in the form of cylinders with a diameter of 150 mm and a height of 300 mm with variations of Bottom Ash 10%, 20%, 30%, 40%, and 50% and with variations of time 3, 7, 14, and 28 days. The results showed that the optimum compressive strength variation occurred at a variation of 10% bottom ash with a compressive strength of 46.43 MPa with a soaking time of 28 days. The compressive strength decreased as the variation was increased.