Investigation of green foamed concrete incorporating palm oil fuel ash and eggshell ash as partial cement replacement
The tendency of concrete to absorb heat, high thermal conductivity and self-weight due to its high density, and its extensive use has given rise to Urban Heat Island (UHI). Therefore, this study was carried out to provide a solution to these limitations by developing innovative lightweight green foa...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/340/1/24p%20ASHFAQUE%20AHMED%20JHATIAL.pdf http://eprints.uthm.edu.my/340/2/ASHFAQUE%20AHMED%20JHATIAL%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/340/3/ASHFAQUE%20AHMED%20JHATIAL%20WATERMARK.pdf |
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| Summary: | The tendency of concrete to absorb heat, high thermal conductivity and self-weight due to its high density, and its extensive use has given rise to Urban Heat Island (UHI). Therefore, this study was carried out to provide a solution to these limitations by developing innovative lightweight green foamed concrete (GFC) of 1800 kg/m3 density incorporating Palm Oil Fuel Ash (POFA) ranging from 20% to 35% and Eggshell Ash (ESA) from 5% to 15% as partial cement replacement. The effect of partial replacement on the workability was determined by J-ring test, mechanical properties such as, compressive and tensile strengths as well as modulus of elasticity and thermal performance of GFC was determined by thermal conductivity and surface temperature. Based upon the results, it was observed that the combined utilization of POFA and ESA reduced the workability slightly but enhanced the mechanical properties of GFC such that it can be used for structural applications. It was also observed that 25P5E, a total 30% cement replacement, was the optimum mix at which the maximum compressive and higher tensile strength, though up to 40% cement replacement can be done without any loss in strength. With the addition of POFA, the colour of specimens became blackish, thus due to albedo effect, these samples recorded higher surface temperature, though the surface temperature reduced slightly with the increment of ESA content. The inclusion of POFA and ESA in GFC reduced the thermal conductivity value. The combined utilization of POFA and ESA in the development of GFC contributes not only to reduction of dependency on cement for manufacturing of concrete but also towards the development of sustainable buildings which reduce the use of natural resources while at the same time provide beneficial mean for utilization of waste materials instead of disposing in landfills which causes scarcity of land and environmental issues. |
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