Pengaruh Baking Filter Dust (BFD) PT Inalum sebagai Bahan Substitusi Semen terhadap Kuat Tekan Beton Normal Pasca Curing dengan Rendaman Larutan Asam Sulfat (H2SO4)

Abstract

PT Inalum as the largest aluminum industry company in Indonesia is located in an extreme environment (seawater environment) with a sulfate content in the soil of 5- 15% and has a soil pH of 4-9. In producing aluminum, PT Inalum produces various kinds of waste, one of which is BFD (Baking Fillter Dust). BFD is the residual result of burning carbon (anode) which is burned at 1250oC for 38 hours mixed with ceramic ball and coke. The resulting BFD is still minimally utilized while its production continues to increase. In this study, BFD (Baking Fillter Dust) was utilized as a cement substitution material to see the extent of the increase in compressive strength of concrete by comparing normal concrete after curing with sulfuric acid solution (H2SO4). The research method used is experimental by substituting cement with variations of BFD 0%, 5%, 10%, 15% and 20% of the weight of cement. In this study, the specimens were soaked with sulfuric acid solution (H2SO4) with a concentration of 5% (pH = 4,01), then tested for concrete compressive strength at the age of 3, 7, 14 and 28 days. The results showed that BFDA05 could increase the compressive strength of concrete by 30.76 Mpa at 28 days (1.55% or 0.0155 times stronger than BN). However, the compressive strength of concrete decreased with the addition of BFD variation. In addition, in this study, it was obtained that the optimum mass loss in concrete occurred in the BFDA05 variation of 3,60% at the age of 28 days of concrete after curing with 5% H2SO4 solution (pH = 4,01)