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研究了不同温度条件下不同沥青含量的水泥沥青砂浆的抗压性能,以揭示该类有机–无机复合材料力学性能的温度敏感性规律。在–40～80℃范围内选择不同环境温度,采用电液伺服控制材料万能试验机测试了水泥沥青砂浆静态单轴抗压荷载下的应力–应变全曲线,获得了峰值应力和弹性模量随温度变化的基本规律。结果表明:随温度的降低,应力–应变曲线的上升段斜率增大,峰后下降段逐渐变陡,力学特性逐渐出现韧–脆转换。一般而言,水泥沥青砂浆的弹性模量和峰值应力随温度的升高和沥青含量的增大而降低,其温度敏感性随沥青含量的增大而增大。沥青含量较大的水泥沥青砂浆,其弹性模量和峰值应力随沥青含量变化幅度不大。建立的经验关系式成功描述了不同沥青含量的水泥沥青砂浆力学性能随温度变化的定量关系,且拟合结果表明以温感因子表征其力学性能对温度的敏感性具有一定的合理性。温感因子随着沥青含量的增大而增大,峰值应力的温感因子大于弹性模量的。
The compressive properties of cement asphalt mortar with different asphalt contents under different temperature conditions were studied to reveal the temperature sensitivity of mechanical properties of such organic-inorganic composite materials. In the range of -40 ~ 80 ℃, ambient temperature was selected. The stress-strain curve under static uniaxial compressive load of cement asphalt mortar was tested by electro-hydraulic servo controlled universal testing machine. The peak stress and elastic modulus The basic law of temperature change. The results show that with the decrease of temperature, the slope of the ascending section of stress-strain curve increases, and the descending section of the stress-strain curve becomes steeper, and the mechanical properties gradually develop tough-brittle transition. In general, the elastic modulus and peak stress of cement asphalt mortar decrease with the increase of temperature and asphalt content, and the temperature sensitivity of cement mortar increases with the increase of asphalt content. Asphalt content of cementitious asphalt mortar, the elastic modulus and peak stress changes with the content of asphalt is not large. The established empirical relationship successfully describes the quantitative relationship between the mechanical properties of cement asphalt mortar with different asphalt content and temperature, and the fitting results show that it is reasonable to use the temperature sensitivity factor to characterize the sensitivity of the mechanical properties to temperature. The temperature sensitivity factor increases with the increase of bitumen content, and the temperature sensitivity factor of peak stress is larger than the elastic modulus.