经历高温后花岗岩与混凝土力学性质的试验研究

Experimental research on the mechanical properties of granite rock and concrete after high-temperature

对经历高温后的花岗岩和高强混凝土的力学性能进行了试验研究。比较分析了经历不同温度作用后花岗岩和混凝土的应力-应变全过程曲线、峰值应力、峰值应变和弹性模量的变化情况。研究表明:随受热温度的升高,花岗岩和高强混凝土的强度、弹性模量逐渐下降,峰值应变逐渐增大。高温后花岗岩具有明显不同于高强混凝土的特点,受热温度低于400℃,花岗岩的力学性质变化很小,而混凝土的力学性质迅速劣化。高温对混凝土力学性质的影响程度比对花岗岩要明显。

The experimental research on the mechanical prope rties of granite rock and concrete after different high temperatures was conducted. The mechanical pr operties include stress-strain curve, peak stress, peak strain and Young's mod ul us of granite rock and concrete. The results showed that the temperature did not obviously affect the mechanical properties of granite rock in the range from ro om temperature to 400℃. The mechanical properties of granite rock deteriorated rapidly with the increase of temperature when the temperature was above 400℃. The peak stress ( or the strength) and Young's modulus decreased rapidly, while the peak strain in creased rapidly. However, the high temperature obviously affected the mechanical properties of concrete. With the increase of temperature,the peak stre ss (or the strength) and Young's modulus of concrete decreased rapidly.