PEMANFAATAN BATU PUMICE DALAM MENGURANGI PENURUNAN PERFORMA BETON PASCA KEBAKARAN

Abstract

Concrete that has been burned at 400° C will experience degradation to a residual compressive strength of 58.40%. This will affect the strength of the concrete structure and will cause the concrete to become brittle, thus allowing the structure to fail. Then it will require passive fire protection by using materials that have some resistance to the fire. One material that has the potential to create fire resistance is pumice stone. The purpose of this study was to determine the value of compressive strength and the rate of reduction in compressive strength of Muntilan sand pumice concrete due to the changes in combustion temperature of 27˚C,300˚C, and 600˚C. In this study, used a 45 pieces concrete cylinder with a diameter of 15 cm and a height of 30 cm. with variations of pumice stone proportion of 0%, 25%, 50%,75% and 100% of the volume of coarse aggregate with a water cement ratio of 0.5. Compressive strength test with a compression device at the age of 28 days. The results of this study indicate that the combustion temperature affects the compressive strength of pumice concrete. The higher the combustion temperature, the higher the strength reduction that occurs. The amount of reduction in compressive strength due to an increase in combustion temperature ranged from 0.16% to 55.38% of the control specimens.