Pengaruh Abu Vulkanik Gunung Sinabung sebagai Substitusi Semen Terhadap Kuat Tekan Beton

Abstract

Mount Merapi eruption in 2014 leaves a lot of material volcanic ash are not utilized well. Volcanic ash into materials including natural Pozolan because it contains elements of silica and alumina so as to reduce the usage amount of Portland cement in the concrete mix. Sinabung volcanic ash used to try to reduce the amount of consumption of cement in the concrete mix quality K-175. The study was planned to make the Mix Design. This study to determine the effect of the use of ash as a cement substitute for the concrete compressive strength testing K-175. Specimens used are concrete cylinders with a diameter of 150 mm and a height of 300 mm. Number of test specimens for each variation of 20 specimens. Concrete compressive strength test results mean for Normal Concrete 210.9 kg / cm2, Variation 20% Volcanic Ash was 177.1 kg / cm2, 50% Variation of volcanic ash was 113.2 kg / cm2 for 28 days.