| Summary: | Lightweight concrete has density in the range of 400 kg/m3-1900kg/m3. The application of lightweight concrete in this country including the lightweight concrete block. However, the use of the concrete lead to the increasing demand of the cement, carbon emission and finally causing the environmental problem. Hence, there are many researchers find the alternative on reducing the use of cement as the main material of the concrete. Malaysia as the country that increased the economy by the agricultural field and industrial country produce a lot of waste as Palm Oil Fuel Ash (POFA) and Ground Granulated Blast-furnace Slag (GGBS). However, the agricultural waste and the industrial waste has the pozzolanic characteristics as the replacement cement materials. Hence, the research has conducted to determine the percentages chemical composition of the POFA and GGBS compared to the cement, the compressive strength of the lightweight concrete block and the properties of the block assembling. The testing has been conducted to achieve the objectives are XRF Test, Compressive Strength, Density, Water Absorption, and Prism Test. The testing was conducted on the sample with the size of 250mm x 125mm x 100mm. The density result of the block stated that the density of blocks less than 1900kg/m3. The percentage of water absorption is less than 20% also affected the compressive strength result to be in the range of 6.9 MPa-17.3 MPa and show the block can be used as the non-structural wall through the cracking failure and prism compressive strength. Hence, GGBS and POFA are effective as the cement replacement materials in terms of density, water absorption and compressive strength. © 2022
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