Pemanfaatan Limbah Batubara (Fly Ash) Sebagai Material Pengganti Agregat Kasar Pada Pembuatan Beton Ringan

Abstract

Sebagai salah satu bahan bangunan perkembangan beton beton saat begitu pesat, yang merupakan campuran pasir dan kerikilyang ditambah semen dan air. Beton ringan adalah beton yang memiliki berat jenis (density) maksimum sebesar 1.850 kg/m3. Pada proyek bangunan tinggi (high rise building) penggunaan beton ringan secara signifikan dapat mengurangi berat konstruksi. Beton ringan dapat dibuat dengan dengan mengganti agregat kasar maupun agregat halus dengan material yang berat jenisnya lebih ringan. Dalam penelitian ini, penulis menggunaan fly ash sebagai material pengganti aggregat kasar pembentuk beton. Fly ash yang merupakan limbah batubara akan dicampur dengan bahan kimia resin yang berfungsi sebagai pengikat dan perekat dengan perbandingan komposisi agregat 60% fly ash dan resin 40%. Hasil pengujian analisa saringan yang dilakukan terhadap agregat kasar buatan tersebut ABSTRACT As one of the building materials for the rapid development of concrete, which is a mixture of sand and gravel, added with cement and water. Lightweight concrete is concrete that has a maximum density of 1,850 kg / m3. In high rise building projects, the use of lightweight concrete can significantly reduce the weight of the construction. Lightweight concrete can be made by replacing coarse aggregate or fine aggregate with a material that is lighter in density. In this study, the authors used fly ash as a substitute material for coarse aggregates to form concrete. Fly ash which is coal waste will be mixed with chemical resin which functions as a binder and adhesive with an aggregate composition ratio of 60% fly ash and 40% resin. The results of the sieve analysis test carried out on the artificial coarse aggregate obtained that the coarse aggregate gradation is a type of gravel or coral for a maximum size of 20 mm and its specific gravity is 1891 kg / m3 with a concrete compressive strength at 28 days of 6.85 MPa. or decreased from normal concrete of 10.92 MPa (38.55%). So it can be concluded that concrete with a mixture of 60% fly ash aggregate and 40% resin cannot be used as structural lightweight concrete because of its low compressive strength compared to normal concrete, so it can only be used for non-structural