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The research aims to investigate the possibilities of crushed oyster shell (OS) not have to go through the process of burning as a substitution cement for concrete blocks. The cement was replaced with crushed oyster shell not process burning (OS) at 0%, 10, 20, 30, 40 and 50% by the weight of the binder. After that the concrete blocks were tested to determine the compressive strength and moisture absorbed of the concrete blocks cured for 7, 14, 28, 56 and 90 days. The result showed that the compressive strength of the concrete blocks which replaced cement with OS (at the proportion of 10% by the weight of the binder) at 28 days had the compressive strength and water absorbed accordance with the TIS 58-2533 on non-load bearing concrete blocks. Moreover, the concrete blocks which replaced cement with OS at the proportion of 20% and 30% had the compressive strength equivalent to 28 days compressive strength of TIS 58-2533 standard at 56 and 90 days, respectively and decreased when the percentage in addition to OS in concrete blocks of 40 and 50%. Tested results also showed that the water absorbed of concrete blocks increased when the percentage of replacement of OS in binder increased at 10, 20, 30, 40 and 50%. The economical of concrete blocks it has manufactured unit cost is 2.60 baht. Whereas the concrete block containing crushed oyster shell at 10-30 % it has manufactured unit cost at 2.12-2.44 baht, respectively.
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