Modifikasi Beton Polimer dengan Menggunakan SBE (Spent Bleaching Earth) Sebagai Subsitusi Semen dan Bahan Pengisi Limbah Lateks Karet Alam

Abstract

Spent Bleaching Earth is a palm oil industrial waste that has a high silica content, so it can be used as a substitute for cement in the manufacture of concrete. The content of silica compounds will react with water to form calcium hydrate compounds through pozzolanic reactions in the concrete manufacturing process. Conventional concrete has several disadvantages such as low tensile strength of concrete, high water absorption and excessive use of cement which can damage the environment. One of the methods used to overcome the weakness of conventional concrete is polymer concrete modification. Polymer concrete is a composite material which is a mixture of polymer added materials, where the polymer material functions as an aggregate binder in the concrete mixture. In this study, the addition of regenerated Spent Bleaching Earth material as a substitute for cement and overripe latex waste as a polymer material for sand replacement. Concrete was made by mixing cement, sand, gravel and water in a ratio of 1:1,67:2,75:0,48 using a concrete cap with an observation time of 28 days. Concrete testing was carried out by analyzing density, water absorption, compressive strength, flexural strength and microscopic photo analysis (SEMEDX) at variations of Spent Bleaching Earth 0%, 1%, 5%, 15% and 30% of the total cement weight and variations overcooked latex waste 0%, 1%, 5%, 15% and 30% of the total weight of the sand. From the results obtained, the best concrete product produced using a mixture of Spent Bleaching Earth and overripe latex waste is categorized as normal concrete at a density of 2229 kg/m3 at 1% Spent Bleaching Earth ratio and 1% overcooked latex waste. The best water absorption value is 2.06% at 1% Spent Bleaching Earth ratio and 1% overcooked latex waste. The best compressive strength value was obtained at 24.17 MPa at 5% Spent Bleaching Earth ratio and 1% overripe latex waste. In the results of the flexural strength test, the best value was 1.90 MPa at 5% Spent Bleaching Earth ratio and 5% overripe latex waste.