超高性能混凝土高温后性能试验研究
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TU541

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国家自然科学基金(51978186);天津市科技支撑计划(19YFZCSN01180、17YFZCSF01140)


Experimental investigation on behavior of ultra-high performance concrete after high temperature
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    摘要:

    通过对超高性能混凝土进行高温加热和高温作用后立方体抗压强度试验,研究了超高性能混凝土高温作用后的表观特征、质量损失及力学性能。对比了单掺钢纤维、单掺聚丙烯纤维和混掺钢纤维和聚丙烯纤维对超高性能混凝土高温爆裂的抑制效果,考察了温度、纤维种类和掺量、骨料(石英砂和钢渣)对超高性能混凝土强度的影响。试验结果表明:混掺1%钢纤维和2%聚丙烯纤维能有效抑制超高性能混凝土高温爆裂,在高温作用后依旧保持完整形态;钢渣骨料混杂纤维超高性能混凝土具有优异的高温力学性能,在1 000℃高温作用后仍能保持67%的残余强度;随着温度的升高,超高性能混凝土立方体抗压强度整体上表现出先升高后降低的规律;在目标温度超过600℃时,高温增强了超高性能混凝土的延性。

    Abstract:

    The apparent characteristics, mass loss and mechanical properties of ultra-high performance concrete after exposure to high temperature were studied through the high temperature heating test and the cubic compressive strength test. The effects of steel fiber, polypropylene fiber, steel fiber and polypropylene fiber on cracking suppression of ultra-high performance concrete were compared. The effects of temperature, fiber type and content, aggregate (quartz sand and steel slag) on the strength of ultra-high performance concrete were investigated. The test results show that 1% steel fibers and 2% polypropylene fibers can effectively restrain high temperature explosion behavior, and the specimen remains intact after high temperature. Ultra-high performance concrete with steel slag aggregate and hybrid fiber has excellent high temperature mechanical properties, the residual strength of 67% can still be maintained after being exposed to high temperature at 1 000℃. With the increase of temperature, the cubic compressive strength of ultra-high performance concrete increases first and then decreases. High temperature enhances the compressive ductility of ultra-high performance concrete when the target temperature is more than 600℃.

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杨婷,刘中宪,杨烨凯,吴成清.超高性能混凝土高温后性能试验研究[J].土木与环境工程学报(中英文),2020,42(3):115-126.

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  • 收稿日期:2019-09-22
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  • 在线发布日期: 2020-06-13
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