Postfiring stress‐strain hysteresis of concrete subjected to various heating and cooling regimes
Postfiring stress‐strain hysteresis of concrete subjected to various heating and cooling regimes
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DOI：
10.1002/fam.785
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发表时间：
2002-05
影响因子：
1.9
通讯作者：
A. Nassif
中科院分区：
文献类型：
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作者：
A. Nassif
本文报道了90个直径为75 mm的硅质骨料混凝土芯的试验研究。175 mm长），其在温度范围（217°C-470°C）内经受18种不同的加热和冷却方案。核心被加热到核心中心达到与外表面相同温度的点，即均匀点。随后，将芯从炉中取出以冷却或在测试温度下浸泡2小时。通过用水喷射加热的芯5分钟或通过在20°C和65%RH的受控环境中空气冷却来冷却。采用硬度损伤试验（SDT）、超声脉冲速度（UPV）和岩相学方法对损伤程度和内部断裂进行了评估。
This paper reports an experimental investigation involving 90 siliceous aggregate concrete cores (75 mm dia. 175 mm long), which were subjected to 18 different heating and cooling regimes in the temperature range (217°C–470°C). The cores were heated to the point when the centre of the core reached the same temperature as the outer surface, the point of uniformity. Subsequently, the cores were either taken out of the furnace to cool or soaked at the test temperature for 2 h. Cooling was either by spraying the heated core with water for 5 min or by air‐cooling in a controlled environment of 20°C and 65% RH. The extent of damage and internal fracture were assessed using the stiffness damage test (SDT) and the ultrasonic pulse velocity (UPV) as well as petrography methods.