超高性能混凝土高温后残余力学性能试验研究

发布时间：2018-02-23 01:01

  本文关键词： 含粗骨料超高性能混凝土 活性粉末混凝土 残余抗压强度 残余劈裂抗拉强度 残余断裂能　出处：《土木工程学报》2017年04期 　论文类型：期刊论文

【摘要】：测定了抗压强度高于140MPa的含粗骨料超高性能混凝土和活性粉末混凝土遭受高温作用后的残余抗压强度、残余劈裂抗拉强度和残余断裂能。结果显示,两种超高性能混凝土的残余强度均随着目标温度的升高而呈现先增大再降低的趋势,而残余断裂能均随着目标温度的升高逐渐降低。各目标温度下,含粗骨料超高性能混凝土的残余抗压强度均高于活性粉末混凝土,但其残余劈裂抗拉强度和断裂能低于后者。活性粉末混凝土在300℃临界温度下的峰值残余抗压强度和峰值残余劈裂抗拉强度分别比常温时提高了26.8%和19.3%,800℃高温后的强度损失率分别为72.3%和81.4%。含粗骨料超高性能混凝土在400℃临界温度下的峰值残余抗压强度和在300℃目标温度下的峰值劈裂抗拉强度分别比常温时提高了34.0%和6.8%,800℃高温后的强度损失率分别为70.2%和84.9%。所以,对于有抗火灾高温要求的工程结构,含粗骨料超高性能混凝土适合用于受压构件,而活性粉末混凝土适宜于抗弯构件。
[Abstract]:The residual compressive strength, residual splitting tensile strength and residual fracture energy of ultra-high performance concrete containing coarse aggregate and reactive powder concrete under high temperature were measured. The residual strength of both UHPC and UHPC increased first and then decreased with the increase of the target temperature, while the residual fracture energy decreased gradually with the increase of the target temperature. The residual compressive strength of ultra-high performance concrete containing coarse aggregate is higher than that of reactive powder concrete. But its residual splitting tensile strength and fracture energy are lower than the latter. The peak residual compressive strength and peak residual splitting tensile strength of the reactive powder concrete at the critical temperature of 300 鈩，

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