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Concrete is the most widely used building material in construction activities, developments in the era mean that the need for components increases every year, which requires concrete materials from nature such as coarse crushed stone aggregate. This research tries to use blood cockle shells (Anadara Granosa) as a substitute for coarse aggregate in mixing concrete mix designs. The aim of this research is to determine the effect of replacing blood cockle coarse aggregate (Anadara Granosa) on the compressive strength of concrete. The use of blood cockles (Anadara Granosa) can be another alternative in concrete mix design, where the concrete used uses K-300 concrete as a test object. Tests were carried out on concrete aged 14 & 28 days. According to the results of research on the compressive strength of concrete, the results of comparative research between normal concrete and concrete with blood cockle (Anadara Granosa) as a substitute for coarse aggregate obtained less than optimal results. The results obtained in this study showed a comparison of 1.03 MPa for concrete mixed with 10% blood cockles, and 1.86 MPa for concrete mixed with 20% blood cockles. with the absorption results on concrete aged 14 days, the greatest results were obtained in sample 1 Anandra granosa 20% with a figure of 0.00051%, at the age of 28 days the absorption that occurred obtained relatively the same results at 0.002%.
Keywords : Shells (Anandra Granosa) , K-300 concrete, compressive strength, Absorption
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