Analisis Pengaruh Peningkatan Durasi Waktu Terhadap Kuat Tekan Mutu Beton K-250 Pasca Kebakaran

Abstract

There are many factors that cause damage to a building, among others are age and fire disaster. Many of the consequences of this disaster, with very high temperatures are expected to cause the concrete to change its properties and strength. The main factor that causes the concrete to change is the high temperature received by the concrete, in addition to the duration temperature, it is also very influential on changes in the properties and strength of the concrete. Therefore, this study aims to discuss the strength of the concrete structure, especially looking at the comparison or decrease in the strength of post-combustion concrete with normal concrete. This research was conducted by giving the duration of burning on the test object that is 3 hours, 6 hours, 9 hours with the same quality of concrete at the age after 28 days. And replace watering with immersion for 4 minutes after the test object is burned. Burning is done using an oven with a temperature of 200˚C. From the results of the compressive strength research obtained, at the age of the test object more than 28 days and soaking for 4 minutes, the compressive strength of the concrete decreased by 20.13 kg/cm3 that is (7.96%) at the duration of 3 hours of combustion ,44.61 kg/cm3 (17.6%) at a duration of 6 hours, and 50.32 Kg/cm3 that is (19.9%) at a duration of 9 hours. In each variation of the duration of combustion, the concrete did not experience significant physical changes. Keywords: