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《Journal of Zhejiang University(Engineering Science)》 2007-09
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Analytical prediction and experimental research on shrinkage cracking of restrained early-age concrete

JIN Nan-guo,JIN Xian-yu,TIAN Ye(Department of Civil Engineering,Zhejiang University,Hangzhou 310027,China)  
The early-age mechanical properties and drying shrinkage of high performance concrete added with fiber were studied to investigate the development of stress in restrained concrete and predict the cracking age of concrete more precisely.An incremental representation of stress of restrained concrete ring was established based on elasticity theory in considering creep and restraint degree. Then the maximum tension stress theory was introduced to predict the cracking age of restrained concrete ring.Experimental and theoretical analysis showed that fiber addition reduced the drying shrinkage for about 2% to 20% at different ages,and the reduction decreased with age.Fiber addition also postponed the cracking age of concrete ring and narrowed the crack width.In theory,the cracking ages of the high performance concrete with and without fiber were 28 and 22 d respectively,which were in good agreement with the experimental results.
【Fund】: 国家自然科学基金资助项目(50578142)
【CateGory Index】: TU528
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