| dc.description.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) | en_US |
