The effects of the strain rate, water/cement ratio, temperature and number of freeze–thaw cycle on the ultimate compressive strength, peak strain and elastic modulus of cement mortar composite specimens were studied using uniaxial compression test. Test results show that: (a) The strength difference of cement mortar composite specimens is not significant when the axial loading direction is parallel to the interface of two components with different water/cement ratios under low strain rate loading. The strength of cement mortar composite specimens mainly depends on the one with lower strength, and the strength of cement mortar specimen with high strength is more sensitive to the strain rate than that of cement mortar specimen with low strength. (b) With the increase of temperature from 25°C (room temperature) to 500°C, the strength of the specimen with high compressive strength will increase first and then decrease. Nevertheless the strength of the specimen with low compressive strength will gradually decrease. The strength of cement mortar composite specimen will decrease with increased number of freeze–thaw cycle. (c) Under the same strain rate, after the same high temperature or the same number of freeze–thaw cycle, the peak strain of the composite specimens composed of two water/cement ratio components is much larger than that of the specimen composed of only one component; conversely, the elastic modulus shows an opposite trend.

中文翻译：

---

应变速率，温度和冻融循环对水泥砂浆复合材料试样力学性能的影响

利用单轴压缩试验研究了应变速率，水灰比，温度和冻融循环次数对水泥砂浆复合材料标本的极限抗压强度，峰值应变和弹性模量的影响。试验结果表明：（a）在低应变速率荷载下，当轴向荷载方向平行于水灰比不同的两个构件的界面平行时，水泥砂浆复合材料试样的强度差异不明显。水泥砂浆复合试件的强度主要取决于强度较低的一种，高强度水泥砂浆试件的强度比低强度水泥砂浆试件的应变率更敏感。（b）随着温度从25°C（室温）升高到500°C，高抗压强度试件的强度先增大后减小。然而，低抗压强度的试样的强度将逐渐降低。水泥砂浆复合材料试样的强度将随着冻融循环次数的增加而降低。（c）在相同的应变率下，在相同的高温或相同数量的冻融循环后，由两个水灰比组成的复合材料试样的峰值应变要比仅由两个水灰比成分组成的试样的峰值应变大得多。一种成分；相反，弹性模量显示相反的趋势。水泥砂浆复合材料试样的强度将随着冻融循环次数的增加而降低。（c）在相同的应变率下，在相同的高温或相同数量的冻融循环后，由两个水灰比组成的复合材料试样的峰值应变要比仅由两个水灰比成分组成的试样的峰值应变大得多。一种成分；相反，弹性模量显示相反的趋势。水泥砂浆复合材料试样的强度将随着冻融循环次数的增加而降低。（c）在相同的应变率下，在相同的高温或相同数量的冻融循环后，由两个水灰比组成的复合材料试样的峰值应变要比仅由两个水灰比成分组成的试样的峰值应变大得多。一种成分；相反，弹性模量显示相反的趋势。