细集料对高性能混凝土早期塑性收缩开裂的影响
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重庆市科委科技计划资助项目(CSTC2004AC0087)


Influence of fine aggregate on initial shrinkage of high performance concrete
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    摘要:

    砂的种类及砂率影响混凝土中粗细集料的级配、剩余砂浆数量,从而影响新拌混凝土抵抗早期塑性收缩开裂的行为。试验结合重庆地区用砂的特色,以特细砂、混合砂、中砂做为细集料,分析了砂的种类及砂率对高性能混凝土(HPC)早期塑性收缩开裂的影响。结果表明,采用特细砂配制的特细砂HPC和混合砂HPC比天然中砂配制的高性能混凝土更易开裂;对混合砂和中砂高性能混凝土,存在一个最佳砂率,使混凝土的早期塑性收缩开裂最小。

    Abstract:

    The type and percentage of sand affect the gradation of coarsefine aggregate and the amount of spare mortar in concrete, which further affects the resistance of fresh concrete to initial plastic shrinkage. Taking into account the engineering characteristics of sand in the area of Chongqing, P. R. China, three fine aggregates composed of superfine, medium, mixed and manufactured sand, are used to prepare high performance concrete (HPC). The effects of these three fine aggregates on initial plastic shrinkage crack are investigated. The results show that the HPC prepared with superfine sand possesses a higher initial shrinkage value than HPC prepared with mixed or medium sand. An optimal sand percentage is necessary to reduce the initial shrinkage cracking of HPC prepared with mixed or medium sand.

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叶建雄,廖佳庆,杨长辉.细集料对高性能混凝土早期塑性收缩开裂的影响[J].重庆大学学报,2009,32(2):168-172.

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