Abstract
The use of structural lightweight aggregate concrete in structures has several benefits over normal weight concrete, particularly in multi-story buildings. The best way to produce structural lightweight concrete is by using lightweight aggregates. The use of artificial aggregates was minimized because of the high production costs due to huge consumption of energy and raw materials. Therefore, the best alternative to mitigate the negative impact in the construction industry is the use of by-product and waste materials. Oil-palm-boiler clinker (OPBC) and oil palm shell (OPS) are two waste materials from oil palm industry and available in large quantities. Both of these materials are considered as lightweight aggregate. However, OPBC is heavier than OPS. Therefore, concrete containing OPBC as coarse aggregate is considered as semi-lightweight concrete. This paper investigates the effect of the replacement of OPBC by OPS on the compressive strength, density and efficiency factor of concrete. Two mix proportio...
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