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郑钰涛, 李玉成, 彭晨鑫.高温后不同冷却方式对混凝土力学特性的影响水资源与水工程学报[J].,2019,30(4):189-194
高温后不同冷却方式对混凝土力学特性的影响
Effect of different cooling methods on mechanical properties of concrete after high temperature
  
DOI:10.11705/j.issn.1672-643X.2019.04.30
中文关键词:  混凝土  高温  冷却方式  杨氏模量  抗压强度  峰值应力  力学性能  破坏形态
英文关键词:concrete  high temperature  cooling method  Young's modulus  compressive strength  peak stress  mechanical property  failure modes
基金项目:上海市软科学领域重点项目(18692106100); 国家自然科学基金项目(10872133)
作者单位
郑钰涛, 李玉成, 彭晨鑫 (上海理工大学 环境与建筑学院 上海 200093) 
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中文摘要:
      针对50块尺寸为100 mm×100 mm×100 mm的混凝土立方体试件进行高温后不同冷却方式下力学性能试验研究,分析常温(20℃)、200、400、600、800℃这5种不同温度下自然、喷水冷却对杨氏模量、抗压强度、峰值应力等力学性能的影响,此外还探讨了高温后不同冷却方式试件的质量损失、破坏形态。研究结果表明:随着温度升高,两种冷却方式试件的质量损失率逐渐增大,喷水冷却试件质量损失比自然冷却试件小,纵波波速、杨氏模量和抗压强度均呈降低趋势,温度超过400℃以后,喷水冷却试件的降低幅度更大;同时随着温度的升高,应力-应变曲线的峰值应力显著降低,所对应的峰值应变明显增加,弹性阶段曲线斜率显著降低。
英文摘要:
      The mechanical properties of 50 concrete cube specimens with size of 100 mm×100 mm×100 mm were tested under different cooling modes after high temperature. The effects of natural and spray cooling on Young's modulus, compressive strength and peak stress were analyzed at five different temperatures: normal temperature (20℃), 200℃, 400℃, 600℃and 800℃. In addition, the mass loss and failure modes of the specimens with different cooling methods after high temperature were discussed. The results showed that with the increase of temperature, the mass loss rate of the two cooling methods increases gradually. The mass loss of the spray cooling specimen was smaller than that of the natural cooling specimen, and the longitudinal wave velocity, Young's modulus and compressive strength decreased, The spray water cooling test piece has a greater reduction when the temperature exceeds 400℃. As the temperature increases, the peak stress of the stress-strain curve decreases significantly, the corresponding peak strain increases significantly, and the slope of the elastic phase curve decreases significantly.
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