【摘要】 沙漠砂混凝土（DSC）的广泛应用能带来良好的经济效益和环境效益。为了研究高温后DSC性能劣化，对高温后试件进行超声检测、轴心抗压强度试验和SEM分析，研究沙漠砂替代率（DSRR）、温度和冷却方式对超声波速、轴心抗压强度和微观结构的影响。研究表明：DSRR为40%时DSC质量损失率最低，超声波速衰减最小，轴心抗压强度最大；超声波速、损伤度与温度之间满足指数函数关系；建立超声波速与轴心抗压强度损失率、损伤度之间拟合关系模型，研究结果可为DSC工程应用提供技术支撑。更多还原

【Abstract】 Wide application of desert sand concrete(DSC)could provide good economical and environmental benefits.In order to investigate the performance deterioration of DSC after high temperature,ultrasonic testing,axial compressive strength test and SEM analysis were performed.The effects of desert sand replacement rate(DSRR),temperature and cooling method on the ultrasonic velocity,axial compressive strength and microstructure of DSC were investigated.The test results showed that when DSRR was equal to 40%,the mass loss rate of DSC reached the minimum value,the attenuation of ultrasonic velocity was the lowest and the axial compressive strength was maximum value.Ultrasonic velocity and damage met exponential function relationship with temperature.Fitting relation models between ultrasonic velocity and loss rate of axial compressive strength,damage were established,which provided technical support for the engineering utility of DSC.更多还原