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首页> 外文期刊>Magazine of Concrete Research >Early-age behaviour and cracking potential of fly ash concrete under restrained condition
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Early-age behaviour and cracking potential of fly ash concrete under restrained condition

机译：受约束条件下粉煤灰混凝土的早期行为和开裂可能性

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摘要

High-performance concrete (HPC) has been used extensively due to its good workability, lasting durability and high strength. However, the low water/cement ratio in HPC generally induces rather high autogenous shrinkage, resulting in high early-age cracking potential. Fly ash (FA) is an effective mineral admixture used to strengthen early-age concrete performance and lower the cracking potential. Although the early mechanical properties of concrete containing FA have been studied, literature on the cracking potential of FA HPC under adiabatic conditions and constant uniaxial restraint is limited. The influence of FA as a partial replacement of cement on the temperature, autogenous shrinkage, restrained stress, tensile creep and cracking potential of HPC was simultaneously investigated in this study. Three groups of large prismatic specimens with different FA replacement ratios (0, 20 and 50%) were tested using a temperature-stress test machine under adiabatic conditions at full restraint. The test results indicated that: autogenous shrinkage, cracking stress and restrained tensile stress rate of the HPC decreased with an increase in FA content; the use of FA as partial replacement of cement increased the ratio of cracking stress to axial tensile strength and the cracking age of the HPC; the specific tensile creep of mixtures with 20% (FA20) and 50% (FA50) replacement with FA was 0.96 and 1.16 times that of the mixture with 0% replacement (FA00), respectively; the integrated criterion used to evaluate the cracking potential decreased with an increase in FA content.
机译：高性能混凝土（HPC）由于其良好的可加工性，持久的耐久性和高强度而被广泛使用。但是，HPC中较低的水灰比通常会引起相当高的自发收缩，从而导致较高的早期开裂可能性。粉煤灰（FA）是一种有效的矿物掺合料，用于增强早期混凝土的性能并降低开裂的可能性。尽管已经研究了含有FA的混凝土的早期力学性能，但是有关在绝热条件下和恒定单轴约束条件下FA HPC的开裂潜力的文献有限。同时研究了FA作为水泥的部分替代品对HPC的温度，自生收缩，约束应力，拉伸蠕变和开裂电位的影响。使用温度-应力测试机在绝热条件下，完全约束下测试了三组具有不同FA替换率（0％，20％和50％）的大型棱柱形试样。试验结果表明：随着FA含量的增加，HPC的自生收缩，开裂应力和约束拉应力率降低。使用FA作为水泥的部分替代品可增加开裂应力与轴向抗拉强度的比值以及HPC的开裂年龄；用FA代替20％（FA20）和50％（FA50）的混合物的比拉伸蠕变分别是用0％替代（FA00）的混合物的比拉伸蠕变的0.96和1.16倍；用于评估开裂潜力的综合标准随着FA含量的增加而降低。

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  • 来源
    《Magazine of Concrete Research》 |2020年第6期|246-261|共16页
  • 作者

    Shen Dejian; Wang Wenting; Li Qiyao; Yao Panpan; Jiang Guoqing;

  • 作者单位

    Hohai Univ Coll Civil & Transportat Engn Nanjing Peoples R China|Jiangsu Engn Res Ctr Crack Control Concrete Nanjing Peoples R China;

    Jiangsu Engn Res Ctr Crack Control Concrete Nanjing Peoples R China|Nanjing Construct Grp Co Ltd Nanjing 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

    cracks cracking; creep; shrinkage;

    机译：裂缝和裂纹;蠕变;收缩;

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