Abstract
Mount Sinabung is a mountain volcano is active that exist in North Sumatra. To minimize the impact that occurs then the ashes of volcanic and sand lava cold can be used as a material replacement in part of cement and aggregate fine. The purpose of this study was to determine the effect of using volcanic ash as a partial substitute for cement and cold lava sand as a partial substitute for fine aggregate on the compressive strength value. Variations of the mixture were made by adding 5%, 7.5%, and 10% at the immersion age of 7 days, 14 days, 21 days, and 28 days. The test object used is a cube with a size of 15 cm × 15 cm × 15 cm. Results of the study showed that the mixture variation 10% by the age of 28 days can be used as an ingredient mixed early concrete because the value of compressive strength approaching normal concrete.
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