PENGARUH PENAMBAHAN LIMBAH GIPSUM TERHADAP KUAT TEKAN BETON

Abstract

Concrete is composed of three main constituent materials, namely cement, aggregate and water. The development of concrete technology in the trial of adding a mixture of materials continues to be done to achieve the desired strength and quality. In this experiment, the addition of gypsum waste was used as a concrete mixture to determine its effect on the compressive strength of concrete. The variation in the percentage of the addition of gypsum waste is 5%, 10%, and 15% with the age of treatment observed at 14 days and 28 days. The results showed that the normal compressive strength value at 14 days was 186.87 kg/cm², while with the addition of gypsum waste mixture the concrete compressive strength at 5%, 10% and 15% were obtained 178.45 kg respectively /cm², 101, 01 kg/cm², 70.71 kg/cm². Meanwhile the compressive strength value of normal concrete at 28 days is 164.44 kg/cm², and the compressive strength value of concrete after mixed with gypsum waste at 28 days is obtained 157.04 kg/cm², 88.89 kg/cm², 62.22 kg/cm². Based on the results it can be concluded that the addition of gypsum waste as a concrete mixture material can reduce the compressive strength values of normal concrete.

Keywords : Concrete, Compressive Strength, and Gypsum Waste.