温度对高强混凝土力学性能的影响

发布时间：2018-07-01 08:44

本文选题：高强混凝土 + 高温　；参考：《公路》2017年06期

【摘要】：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。
[Abstract]:In order to study the degradation law of temperature on mechanical properties of high strength concrete, the variation of temperature gradient at different locations of three concrete beams under different high temperature environment was tested. The compressive strength and elastic modulus of 108 concrete specimens with different constant temperature time were tested, and the deterioration rules of cube compressive strength, axial compressive strength and elastic modulus of concrete under temperature gradient were obtained. The experimental results show that there are different temperature gradients in concrete under the action of different high temperature and constant temperature time, and when the temperature is constant, the internal temperature gradient of concrete decreases gradually with the extension of constant temperature time. High temperature and temperature gradient together determine the deterioration of mechanical properties of concrete at high temperature, with the increase of high temperature and the prolongation of the time of constant temperature, the compressive strength of concrete cube is increased. The axial compressive strength and elastic modulus of concrete decreased significantly, and the degradation of compressive strength and elastic modulus of concrete at high temperature was significantly higher than that of compressive strength.
【作者单位】：郑州大学土木工程学院;河南省交通科学技术研究院有限公司;
【基金】：高等学校博士学科点专项科研基金资助项目,项目编号20124101110014
【分类号】：TU528

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