Pengaruh penggunaan limbah gypsum dan karbit sebagai pengganti sebagian semen terhadap kuat tekan, kuat tarik, dan modulus elastisitas beton

Abstract

Concrete is the main material in construction consisting of aggregate, water and cement. In the current era of globalization, improving the quality of concrete and its economic value needs to be considered. The development of concrete technology in the trial addition of mixtures continues to be carried out in order to concrete and also has economic value. There are many ways to obtain the desired concrete quality strength, one of which is by adding additives or replacing the main component materials such as cement with substituting material. In this study, materials from industrial waste were used, namely gypsum waste and carbide waste which were used as a partial replacement for cement in the concrete mixture. In this study, the waste was used as a cement substitute with gypsum waste of 4% and carbide of 12%, 14%, and 16% of the total weight of cement. The tests carried out included compressive strength, splitting tensile strength, and modulus of elasticity of concrete which would be tested at the age of 28 days with treatment in the form of immersion in concrete with a total of 40 cylinders of test objects. The sources used in the mixture design are based on SNI-03-2834-2000. The designed compressive strength is 25 MPa. The test results show that replacing part of the cement with gypsum and carbide waste can actually reduce the compressive strength, tensile strength, and elastic modulus of concrete but has a more favorable economic value. The results of the compressive strength, tensile strength, and elastic modulus of cement substitution concrete with gypsum waste variation of 4% and carbide variation of 12%, 14%, and 16% at the age of 28 days decreased. In concrete, the variation of 4% and 12% gypsum waste in all tests obtained the most accepted composition results and can also be used as one of the variations that can be used in the design of concrete mixtures because all the requirements are met in terms of compressive strength, tensile strength, modulus of elasticity, and price and production costs compared to other variations of gypsum and carbide waste