Experimental Study on Mechanical Properties of Lightweight Aerated Concrete After High Temperature

Abstract:

In this paper, through the axial compression test of lightweight aerated concrete after high temperature, the relationships between temperature and mechanical properties, such as compressive strength, elastic modulus and peak strain, are obtained. The results show that the compressive strength of lightweight aerated concrete increases slightly at 100 ℃, and decreases gradually at 300 ℃. When the temperature exceeds 300 ℃, the strength change indistinctively. At 100 ℃, the elastic modulus remained basically unchanged; across 100 ℃, the elastic modulus decreases continuously, and comes into being linear relationship with temperature. With the increase of temperature, the peak strain gradually increases in a linear upward trend. Finally, by analyzing the stressstrain curves at different temperatures, a constitutive model of lightweight aerated concrete after high temperature is proposed.