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Effect of low air pressure on mechanical properties and shrinkage of concrete

机译:低压对混凝土力学性能和收缩率的影响

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摘要

Recently, it was observed that cracking on the surface of concrete bridge pillars is more significant in Chinese high-elevation regions, where the climatic character is low air pressure. Many regions in the world are located in low air pressure climate conditions; however, the influence of air pressure on concrete has rarely been studied before. In this paper, mechanical properties and shrinkage of concrete exposed to different air pressures and relative humidities for 1 year were studied. Effects of air pressure on developments of mechanical properties and shrinkage properties were analysed. A modified environmental coefficient for predicting shrinkage of concrete was proposed. Under lower air pressure, lower mechanical strength and greater shrinkage strain were observed, especially after 28 d. The value of the ratio of shrinkage strains was almost constant during the aging of C30 and C50 concretes. The ratio was larger when air pressure was lower. The modified environmental coefficient, taking account of air pressure, was used to predict concrete shrinkage. This coefficient can be used in existing models in place of the original relative humidity coefficient.
机译:最近,观察到在气候特征为低气压的中国高海拔地区,混凝土桥梁柱子表面的裂缝更为明显。世界上许多地区都处于低气压气候条件下。但是,以前很少研究气压对混凝土的影响。本文研究了暴露于不同气压和相对湿度下一年的混凝土的力学性能和收缩率。分析了气压对机械性能和收缩性能发展的影响。提出了一种预测混凝土收缩率的修正环境系数。在较低的气压下,尤其是28 d后,观察到较低的机械强度和较大的收缩应变。在C30和C50混凝土的老化过程中,收缩应变比的值几乎恒定。当气压较低时,该比率较大。修改后的环境系数(考虑到空气压力)用于预测混凝土的收缩率。可以在现有模型中使用该系数代替原始相对湿度系数。

著录项

  • 来源
    《Magazine of Concrete Research》 |2018年第18期|919-927|共9页
  • 作者单位

    Harbin Inst Technol, Sch Transportat Sci & Engn, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Transportat Sci & Engn, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Transportat Sci & Engn, Harbin, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Transportat Sci & Engn, Harbin, Heilongjiang, 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; shrinkage; tensile properties;

    机译:抗压强度;收缩率;拉伸性能;
  • 入库时间 2022-08-18 00:16:32

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