为了探究玄武岩-聚丙烯纤维增强混凝土的力学性能、渗透性能以及孔结构情况,开展了不同体积掺量下增强混凝土试验。结果表明:在体积掺量0~0.2%范围内,抗压强度随纤维掺量增加先增大后减小,玄武岩纤维、聚丙烯纤维掺量均为0.05%时抗压强度最大,提升幅度达到9.2%;劈拉强度随纤维的掺入均增大,且玄武岩纤维对劈拉强度的提高效应大于聚丙烯纤维;玄武岩纤维和聚丙烯纤维可有效降低混凝土的抗渗性,但是超过最佳纤维掺量时,对混凝土抗渗性产生不利影响。计算得到了玄武岩-聚丙烯纤维增强混凝土分形维数,分形维数与抗压强度呈现良好的正相关关系,而与电通量呈现良好的负相关关系。研究成果可供开展纤维增强混凝土试验的研究人员参考。
Abstract
The mechanical properties, permeability and pore structure of basalt-polypropylene fiber reinforced concrete with varied fiber content were studied.Results reveal that in the range of 0-0.2% volumetric content of fiber,as fiber content grows, the compressive strength improves first and then declines;compressive strength increases by 9.2%,reaching the maximum, when the volumetric content of basalt fiber and polypropylene fiber is 0.05%. The splitting tensile strength increases with the addition of fiber,and the improvement effect of basalt fiber is better than that of polypropylene fiber. Both basalt fiber and polypropylene fiber can effectively reduce the impermeability of concrete,but would have an adverse impact on the impermeability of concrete once exceeding the optimum dosage. In addition,the fractal dimension of basalt-polypropylene fiber reinforced concrete was calculated.The fractal dimension has a good positive correlation with compressive strength and a good negative correlation with electric flux.
关键词
纤维增强混凝土 /
力学性能 /
电通量 /
孔结构 /
相关性分析
Key words
fiber reinforced concrete /
mechanical properties /
electric flux /
pore structure /
correlation analysis
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基金
国家自然科学基金重大项目(51590914)
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