| Summary: | Concrete materials have been of a significant concern through the past years and there has been a huge research on finding alternatives to the traditional materials. Among the most common materials to be substituted are palm oil clinker waste on form of powder due to a presence of silica (pozzolanic material) which helps uphold the strength of concrete and is available in Malaysia also cockle shell powder which consists of calcium carbonate in the form of aragonite and calcite. The objective of this research is to examine the concrete compressive strength and flexural using cockleshell and palm oil clinker as cement replacement with different proportion. For this research, there are six different percentages of palm oil clinker and cockleshell replacement in concrete mixture. For compressive strength test and flexural test, the concrete is tested on 7, and 28 days. The concrete mixture was designed according to ASTM C 109/C 109M standard with water cement ratio of 0.485. For compressive strength test, 36 cubes size 50mm x 50mm x 50mm were tested on 7, and 28 days each. Moreover, for flexural test, 36 concrete beam size 160mm x 40mm x 40mm were tested on 7 and 28 days for each test. This study found that the compressive and flexural strength were decrease by increasing palm oil clinker powder and cockle shell powder percentage as cement replacement.
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