Factors Affecting Compressive Strength of Geopolymer Concrete from Bagasse Ash Mixed with Aluminum Dust
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Abstract
The aim of this research is utilization the bagasse ash, a waste material from sugar factories, as a precursor to producing geopolymer concrete. According to the bagasse ash has a lot of silica elements but has little alumina therefore use aluminum dust as waste material to add alumina in the geopolymer with bagasse ash as raw materials. This research uses bagasse ash from 2 sources, replacing bagasse ash with aluminum dusts 0-1.0% by weight. Ratios of alkaline solution to source material (AL/BA) 0.50-0.65 by weight. Curing temperatures of sample were 60, 80 and 100 °C. From the research, the source of bagasse ash greatly affected the compressive strength of geopolymer concrete. The replacement of bagasse ash with suitable aluminum dusts was 0.40% by weight made the highest compressive strength. The low AL/BA ratios tended to give higher compressive strength but decreased the slump. The high temperature curing effected on the high compressive strength of concrete at early age. However, at any curing temperatures, the compressive strength were similar as the later age of concrete samples. The compressive strength of geopolymer concrete from this research reached to 300 ksc.
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