Abstract
Based on the Volcanology and Geological Hazard Mitigation Center, Mount Sinabung itself is still at hazardous status up until now that can certainly erupt at any time and sprayed a lot of volcanic material which will lead to the abundance of volcanic ash material in the area of Mount Sinabung. How to optimize the volcanic ash waste is what scientists need to think about. In this study, volcanic ash obtained from Mount Sinabung is used as substitution of fine aggregate in the manufacture of concrete brick (paving block). The variations used were 0%, 25%, 50%, and 75% of the starting weight of the fine aggregate used. From the test results, it is obtained optimum compressive strength of 25.2 Mpa and optimum water absorption of 5.998% which means concrete brick (paving block) meets the classification contained in SNI 03-0691-1996.
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