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为了研究温度对高强混凝土力学性能的劣化规律,测试了3个混凝土梁在不同高温环境下不同位置处温度梯度的变化规律,通过对经历不同高温温度、不同恒温时间的108个混凝土试件进行抗压强度和弹性模量的测试,得到了温度梯度作用后混凝土立方体抗压强度、轴心抗压强度和弹性模量的劣化规律。试验结果表明,不同高温温度和恒温时间作用下混凝土内部存在不同的温度梯度;高温温度一定时,随着恒温时间的延长,混凝土内部温度梯度在逐渐减小;高温温度和温度梯度共同决定了高温对混凝土力学性能的劣化程度;随着高温温度的升高和恒温时间的延长,混凝土立方体抗压强度、轴心抗压强度和弹性模量均呈现显著的降低趋势;高温对混凝土轴心抗压强度和弹性模量的劣化作用显著高于抗压强度的劣化。
In order to study the effect of temperature on the mechanical properties of high-strength concrete, the variation of temperature gradients at three different locations under different high-temperature environments was tested. The resistance of 108 concrete specimens subjected to different temperatures and different temperatures was tested The compressive strength, axial compressive strength and elastic modulus of concrete cubes were obtained after the temperature gradient effect. The results show that there are different temperature gradients inside the concrete under different temperatures and temperatures. When the temperature is constant, the temperature gradient inside the concrete decreases gradually with the prolongation of the constant temperature time. The high temperature and the temperature gradient jointly determine the high temperature The degree of deterioration of the mechanical properties of concrete; with the increase of high temperature and constant temperature time, the compressive strength of concrete cubes, the axial compressive strength and elastic modulus showed a significant decrease; high temperature concrete axial compression The degradation of strength and modulus of elasticity is significantly higher than the deterioration of compressive strength.