Potential mixture cold lava sand and volcanic ash as a concrete admixture

• Published in: IOP conference series. Materials Science and Engineering Vol. 1144; no. 1; pp. 12021 - 12028
• Main Authors: Susanti, R D, Abdulrajak, R B, Gowasa, J, Siahaan, D I
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2021
• Subjects: Admixtures; Compressive strength; Concrete; Lava; Mountains; Sand; Substitutes; Volcanic activity; Volcanic ash
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/1144/1/012021

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.