POTENSI LIMBAH FLY ASH BATU BARA PLTU DI SULAWESI SELATAN SEBAGAI BAHAN DASAR MORTAR GEOPOLIMER

Abstract

Fly ash is one of the residues produced from burning coal which consists of fine particles. Fly ash, also known
as fly ash, is one of the industrial wastes from the PLTU in South Sulawesi which is rich in silica and aluminum which
can be used as a sturdy binder through the polymerization process. South Sulawesi Province itself has several coal-fired
power plants. PLTU annually produces a lot of fly ash or fly ash waste. The waste produced by the PLTU raises the
problem that arises is how to use the garbage so as not to pollute the environment and can be used mainly in the
construction world. Because of these problems, it is necessary to research the potential waste of PLTU coal-fired fly ash
in South Sulawesi as a base material for geopolymer mortar. The research method used is the experimental method in the
laboratory. The method in making and testing mortar samples refers to SNI 03-6825-2002. The composition of aggregate
has a ratio of fly ash: sand of 1: 2.75, and the composition of activator 10 Molar NaOH, the ratio of Na2SiO3: NaOH is 2.
The results of the research are the most dominant chemical composition of Fly ash, namely silicate (SiO2), Aluminum
(Al2O3 ), Ferrum (Fe2O3) and Lime (CaO). Fly Ash type A and Fly Ash type A are class C fly ash. The compressive
strength of Geopolymer mortar based on fly ash A is much higher than geopolymer mortar based on fly ash B, and the
compressive strength of geopolymer mortar is very significant with the age of geopolymer mortar.