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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2002, Vol. 3 Issue (2): 188-193    DOI: 10.1631/jzus.2002.0188
Civil Engineering     
Shrinkage and cracking behavior of high performance concretes containing chemical admixtures
QI Meng, LI Zong-jin, MA Bao-guo
Department of Architecture, Zhejiang University, Hangzhou 310027, China; Department of Civil Engineering, Hong Kong University of Science and Technology, HK; College of Material Science and Engineering, Wuhan University of Technology, Wuhan 430041, China
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Abstract  Modern concretes often incorporate several chemical admixtures to alter the properties of fresh or hardened concrete. In this work, the influences of three types of chemical admixtures, calcium nitrite inhibitor (CNI), retarder (D-17) and superplasticizer (W-19) on free shrinkage and restrained shrinkage cracking of high performance concrete were experimentally investigated. The test results showed that, with the same water to binder ratio (0.4), mixtures containing D-17 of 0.25 percent or higher ratio of W-19 (2.76 percent) all exhibited a reduction in free shrinkage and shrinkage cracking width. However, the incorporations of various ratios of CNI into mixtures led to an increase in free shrinkage and shrinkage cracking width as compared to control mixture. In order to study the influence of CNI, the microstructure of concrete mixture containing CNI were investigated by Mercury Intrusion Porosimetry as well as Scanning Electronic Microscopy(SEM) technique.

Key words： Chemical admixtures      High-performance concrete      Free shrinkage      Restrained shrinkage cracking      Microstructure     
Received: 16 June 2001     
CLC:  TV424  
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QI Meng
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QI Meng, LI Zong-jin, MA Bao-guo. Shrinkage and cracking behavior of high performance concretes containing chemical admixtures. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2002, 3(2): 188-193.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2002.0188     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2002/V3/I2/188

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