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Effect of microstructure evolution on mechanical behaviour of concrete after high temperatures

机译：高温后微观组织演变对混凝土力学性能的影响

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摘要

This paper examines the mechanical behaviour of concrete following exposure to elevated temperature up to 800 degrees C through experimental investigation, with emphasis on the effect of microstructure evolution on the deterioration of concrete compressive strength. First, a specially built electrical furnace is employed for the application of high temperature to 21 concrete cylinders before static compression tests. The static stress-strain relationships of the concrete cylinders are presented and compared. Furthermore, a series of experimental techniques are employed to examine the development of concrete microstructure, including thermogravimetric analysis, scanning electron microscope test and mercury intrusion porosimetry investigation. The inherent reason for concrete strength deterioration following elevated temperatures is revealed to be the combined action of decomposition of concrete hydration products, deterioration of the cement paste-aggregate bond, crack development and an increase in porosity. Meanwhile, based on comparison with existing data, the effect of water/cement (w/c) ratio on the mass loss and porosity increase of hydrated cement paste following high temperatures is preliminarily examined. It is found that higher w/c ratio resulted in larger total porosity, and the increase of total porosity as well as the large proportion of harmful pores generally led to the degradation of the concrete's compressive strength.
机译：本文通过实验研究，研究了混凝土在暴露于高达800摄氏度的高温后的力学行为，重点研究了微观组织演变对混凝土抗压强度劣化的影响。首先，在静态压缩测试之前，使用了一个特殊的电炉对21个混凝土圆筒施加高温。给出并比较了混凝土圆柱的静应力-应变关系。此外，还采用了一系列实验技术来检查混凝土微观结构的发展，包括热重分析，扫描电子显微镜测试和压汞法。揭示了高温后混凝土强度降低的内在原因是混凝土水合产物分解，水泥浆-骨料-粘结的劣化，裂缝发展和孔隙率增加的综合作用。同时，在与现有数据比较的基础上，初步研究了水灰比（w / c）对高温后水合水泥浆质量损失和孔隙率增加的影响。发现较高的w / c比导致较大的总孔隙率，并且总孔隙率的增加以及有害孔隙的比例较大通常导致混凝土的抗压强度降低。

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  • 来源
    《Magazine of Concrete Research》 |2018年第16期|770-784|共15页
  • 作者

  • 作者单位

    Hunan Univ Dept Civil Engn China Minist Educ Key Lab Bldg Safety & Energy Efficiency Changsha Hunan Peoples R China;

    Huaqiao Univ Coll Civil Engn Xiamen Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    compressive strength; plain concrete; temperature-related thermal effects;

    机译：抗压强度;普通混凝土;温度相关和热效应;

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