高性能混凝土的拉伸徐变特性
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江苏省交通科学研究计划项目(2010Y36);国家自然科学基金项目(51178106);教育部博士点基金(20120092110037)


Study on Tensile Creep Characteristics of High Performance Concrete
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    摘要:

    掌握拉伸徐变行为是进行混凝土应力分析和开裂预测的重要前提。采用自行设计的混凝土拉伸徐变试验装置,系统研究了不同加载龄期(1、3、7 d)、不同水胶比(0.29、0.33、0.37)和不同粉煤灰掺量(0%、20%、40%)下高性能混凝土的拉伸徐变特性。实验结果表明,拉伸徐变随加载龄期和水胶比的增大而显著减小。粉煤灰掺入可以明显提高混凝土抵抗徐变的能力,且随掺量的增加而增强。拉伸徐变可抵消42%~62%的自由收缩,降低混凝土早期开裂的风险。

    Abstract:

    The understanding of tensile creep behavior is extremely important in accurate stress analysis and crack prediction. A set of concrete tensile creep testing apparatus was constructed. The characteristics of tensile creep under different loading ages(1,3 and 7 days),different water-binder ratio(0.29,0.33 and 0.37) and different fly ash proportion (0%, 20% and 40%) were discussed. The results show that tensile creep of HPC decreases as the loading age and water-binder ratio increases. The creep-resistance of HPC enhances with the increase of fly ash proportion. Tensile creep counteracts free shrinkage by 42%~62%,decreases the possibility of cracking of HPC at early ages.

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李司晨,张云升,张国荣.高性能混凝土的拉伸徐变特性[J].土木与环境工程学报(中英文),2013,35(Z2):40-44. Li Sichen, Zhang Yunsheng, Zhang Guorong. Study on Tensile Creep Characteristics of High Performance Concrete[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2013,35(Z2):40-44.[doi]

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  • 在线发布日期: 2014-02-25
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