Study of brittle fracture and temperature resistance in the range of 20-11000С of autoclaved cellular reinforced materials

Abstract

In this paper, the study of cellular autoclaved reinforced material resistant to brittle fracture and temperatures in the range of 20-1100С. The analysis of the results shows that the studied cellular autoclaved reinforced materials by the value of F (brittle fracture criterion) will not brittle fracture under conditions of a sharp change in temperature from 20 to 300 °C because the value of F ≤ 4. It was determined that on the wall system made of blocks of the material in question with a density of 400 kg/m3, 10 days after the completion of masonry under standardized fire exposure for 180 minutes in the temperature range of 20-1100 °C, there was no loss of thermal insulation, bearing capacity and integrity of the samples. During the tests, the maximum temperature values in the middle of the cross-section of the samples did not exceed 97°C. The values of As, Af, Amin for the test time of 182 minutes were 175074, 175212, 168560 Сmin, respectively, which meets the criterion requirements of DSTU B V.1.1-19:2007 and ensures the fire resistance class REI 180.