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不同水胶比的粉煤灰混凝土的自收缩(英文)
作者:阎培渝 陈志城 
单位:清华大学土木工程系 教育部土木工程安全与耐久重点实验室 
关键词:自收缩 强度 粉煤灰 水胶比 
分类号:TU528
出版年,卷(期):页码:2014,42(5):585-589
DOI:10.7521/j.issn.0454-5648.2014.05.05
摘要:

高强混凝土的自收缩是导致其开裂的重要因素。为此,对不同水胶比的粉煤灰混凝土在水化初期的强度发展与自收缩的关系进行了研究。结果显示,粉煤灰混凝土的强度与自收缩均随着水胶比增加而下降,并随着粉煤灰掺量的增加而近似地线性下降。各种组成的混凝土的自收缩均表现为水化第1 d内的快速增加,随后缓慢增加。混凝土的收缩特性可根据其力学性能来预测。

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The autogenous shrinkage of high strength concrete is a serious factor to increase cracking risk of concrete structure. The relationship between the strength development and autogenous shrinkage of fly ash concrete with different water-binder ratios in early hydration age was investigated. The results show that autogenous shrinkage and strength of concrete containing fly ash decrease with the increase of water-binder ratio, but quasi-linearly decrease with the increase of fly ash dosage. The autogenous shrinkage of concrete with various mix proportions consists of a rapidly increasing stage in the first hydrating day and a gently increasing stage in the later time. The shrinkage performance of concrete could be predicted through its mechanical property.

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基金项目:
国家自然科学基金 (51278277,U1134008) 资助项目。
作者简介:
第一作者:阎培渝(1955-),男,教授。E-mail: yanpy@tsinghua.edu.cn
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参考文献:
[1] PAILLERE A M, BUIL M, SERRANO J J. Effect of fiber addition on autogenous shrinkage of silica fume concrete[J]. ACI Mater J, 1989, 86(2): 139-144.
[2]TAZAWA E, MIYAZAWA S. Autogenous shrinkage caused by self-desiccation in cementitious material[C]//Proceedings of 9th International Congress on the Chemistry of Cement, 1992: 712-718.
[3] CHEN Z C, YAN P Y. The autogenous shrinkage of shrinkage-compensating concrete[J]. J Chin Ceram Soc, 2010, 38(4): 568-573.
[4]PIGEON M, TOMA G, DELAGRAVE A, et al. Equipment for the analysis of the behavior of concrete under restrained shrinkage at early ages [J] . Mag Concr Res, 2000, 52(4): 297-302.
[5]YAN P Y, LUAN Y. Study and application of high volume fly ash concrete in massive concrete structure[C]// Proceedings of the International Conference of Concrete Platform, Belfast, UK, 2007: 405-414.
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