Thermomechanical evaluation of sustainable foamed concrete incorporating palm oil fuel ash and eggshell powder
Abstract
Increased usage of concrete contributes towards urban thermal discomfort due to Urban Heat Island effect while the corresponding increased consumption of cement also cause significant rise in carbon dioxide gas emissions. This experimental work aims at investigating the performance of 1800 kg/m3 dry density green sustainable foamed concrete (GFC) when locally available wastes such as POFA and ESA are utilized as supplementary cementitious materials. The POFA content varied by replacing cement replacement from 15 to 35%, which increament of 5%, while being supplemented with 5% ESA. To investigate the performance of the developed sustainable foamed concrete, the flowability, mechanical strengths (compressive and splitting tensile strengths) and thermal performances (thermal conductivity and surface temperature) were assessed. Incorporation of 15-25% of POFA supplemented with 5% ESA as partial cement replacement materials resulted in enhanced mechanical strengths. Although usage of POFA can reduce the thermal conductivity, the POFA content must be limited to 15-25% to prevent excessive heat absorption by the exterior surface of concrete. In overall, an optimum use of 15% POFA in combination of 5% ESA is desirable for the production of a sustainable foamed concrete.
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