Effect of Pre-wetted Light-weight Aggregate on Internal Relative Humidity and Autogenous Shrinkage of Concrete

武汉理工大学学报-材料科学版(英文版), 2006, 21(1): 134-137.

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1.School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

2.School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

3.School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

4.School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

5.School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

基金项目: Wuhan Chenguang Project

Effect of Pre-wetted Light-weight Aggregate on Internal Relative Humidity and Autogenous Shrinkage of Concrete

Keywords： autogenous shrinkage

This research indicates that the gradient of internal relative humidity (IRH) decreases rapidly within 7-day curing age in HPC.The amount of water imported by pre-wetted light-weight aggregate can regulate IRH of concrete.By importing a proper amount of water, the process of the decline of IRH can be delayed and the antogenous shrinkage can be reduced.The relationship among the amount of water imported by pre- wetted lightweight aggregate, IRH and AS was established.The result provides a new method of reducing early AS and enhancing early cracking resistance of HPC.

参考文献

[1]	P Lura.Autogenous Deformation and Internal Curing of Concrete[M].Delft:Delft University Press,2003
[2]	Xu Shenghua;Jiang Zhengwu .Research on Relative Humidity and Autogenous Shrinkage of High Performance Concrete[J].Journal of Chongqing Jianzhu University,2004,26(02):21-24.
[3]	Arnon Bentur;Shin-ichi Igarashi;Konstantin Kovler .Prevention of autogenous shrinkage in high-strength concrete by internal curing using wet lightweight aggregates[J].Cement and Concrete Research,2001(11):1587-1591.
[4]	Jiang Yaqian;Xu Zhongzi;Wu Jianlin.Internal Curing Effect of Soaked Lightweight Aggregate on High Performance Concrete[J].Concerete and Cement Products,2003(05):13-15.
[5]	Hu Shuguang;Wang Fazhou;Ding Qingjun.The Influence of Water Absorption and Pre-wetted Method of Lightweight Aggregate on the Workability of Concrete[J].Journal of Huazhong University of Science and Technology(Nature Science),2002(02):1-4.

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Effect of Pre-wetted Light-weight Aggregate on Internal Relative Humidity and Autogenous Shrinkage of Concrete

参考文献