Traditionally fly ash (FA) has been used to replace cement as binder in the geopolymer concrete. The utilization of palm oil\r\nindustrial waste materials known as palm oil fuel ash (POFA) and oil palm shell (OPS) that are abundantly available in South\r\nEast Asia as binder and coarse aggregate in geopolymer concrete would give an added advantage in both the environmental and\r\neconomic aspects. The mechanical properties of the OPS geopolymer concrete (OPSGC) through the use of POFA, FA, and OPS\r\nare investigated and reported. A total of ten OPSGC mixtures were prepared with varying percentages of POFA and FA such as 0,\r\n10, 20, 40, and 100%. The specimens prepared with two alkaline solution to binder (AK/B) ratios of 0.35 and 0.55 were oven cured at\r\n65�°C for 48 hours. The experimental results showed that the highest compressive strength of 30MPa was obtained for the mix with\r\n20% replacement of FA by POFA and AK/B ratio of 0.55, which underwent oven curing. Further, the mix of up to 20% POFA (with\r\nAK/B ratio of 0.55) can be categorized as structural lightweight concrete. An increase of the POFA content beyond 20% decreases\r\nthe mechanical properties, and hence this mix is recommended to be used.
Loading....