超低温对超高韧性水泥基复合材料抗压韧性影响试验

超高韧性水泥基复合材料(UHTCC)是一种具有超高韧性及良好耐久性能的新型复合材料，其抗压韧性是评价其工作性能的重要指标。通过对5组不同纤维掺量的UHTCC在超低温作用后的单轴受压试验，研究超低温作用下UHTCC的抗压韧性评价指标，并对其变形能力进行等效分析，为UHTCC在超低温环境下的工程应用提供理论支持。研究结果表明:在一定范围内，随着纤维体积掺量的增加，UHTCC的抗压强度、抗压韧性均有明显提升，而超出最优掺量后性能反而略有下降；超低温对于UHTCC的抗压强度具有一定的提升作用，当温度降低至?196℃，其轴向抗压强度最大可提升约74.42%，但其脆性性能更明显。 

Experimental study on the influence of ultra-low temperature on compressive toughness of ultra high toughness cementitious composites

Ultra high toughness cementitious composites (UHTCC) is a new material with ultra-high toughness and good durability. Its compressive toughness index is an important index to evaluate the toughness of UHTCC. 5 groups of UHTCC with different fiber contents were tested under uniaxial compression after ultra-low temperature, and the evaluation index of compressive toughness of UHTCC under ultra-low temperature was studied, and its deformation capacity was equivalent analyzed. The experimental results show that within a certain range, with the increase of fiber content, the compressive strength and toughness of UHTCC are significantly improved, but beyond the optimal content range, the performances are not improved, but are slightly decreased; ultra-low temperature has a certain improvement on the compressive strength of UHTCC, when the temperature is reduced to ?196℃, the axial compressive strength can be increased by 74.42%, but it shows obvious fragility.