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超高韧性水泥基复合材料(,简称)是一种新型的绿色建筑材料,具有超高的韧性和优良的耐久性能。本文对UHTCC材料预施加拉伸荷载至拉应变分别达到1.5%、2%、2.5%,研究其在带裂缝工作状态下的水渗透性能。试验结果表明,UHTCC在裂缝宽度40~70μm的状态下仍然具有较好的抗渗性能,随着裂缝宽度的增加,UHTCC渗透系数呈现阶段性增长。采用相对渗透高度法测定结果显示,当UHTCC平均裂缝宽度为42.45μm时,其相对渗透系数仅为未开裂C30混凝土的10倍左右。对10mm、12mm、15mm三种不同厚度的UHTCC试件测试显示,与10mm厚试件相比,12mm以上厚度的UHTCC具有较好的裂缝分散能力和更好的抗渗性能。本文还通过拟合建立了平均裂缝宽度与平均单条裂缝渗透系数之间的关系。
Ultra-high toughness cement-based composites (, referred to) is a new type of green building materials, with super toughness and excellent durability. In this paper, pre-applied UHTCC tensile load to tensile strain of 1.5%, respectively, 2%, 2.5%, to study the water penetration performance of the fracture working state. The results show that the UHTCC still has good impermeability in the condition of 40 ~ 70μm crack width. With the increase of the crack width, the permeability coefficient of UHTCC shows a stepwise increase. The results of relative penetration height method show that when the average width of UHTCC is 42.45μm, the relative permeability coefficient is only about 10 times that of uncracked C30 concrete. The tests on UHTCC specimens of three different thicknesses of 10mm, 12mm and 15mm showed that UHTCC with thickness above 12mm had better crack dispersion ability and better impermeability compared with 10mm thick specimen. In this paper, we also establish the relationship between the average crack width and the average single fracture permeability coefficient by fitting.