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http://dx.doi.org/10.4334/JKCI.2010.22.5.641

Evaluation of Shrinkage Cracking Characteristics and Degree of Restraint for Ultra-High-Strength Concrete  

Yoo, Doo-Yeol (School of Civil, Environmental and Architectural Engineering, Korea University)
Min, Kyung-Hwan (School of Civil, Environmental and Architectural Engineering, Korea University)
Yang, Jun-Mo (School of Civil, Environmental and Architectural Engineering, Korea University)
Yoon, Young-Soo (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of the Korea Concrete Institute / v.22, no.5, 2010 , pp. 641-650 More about this Journal
Abstract
The concrete cracking from the restrained stress caused by the shrinkage may play significant cause of deterioration of concrete structures by allowing the permeation of sulphate and chloride ions which in turn triggers corrosion of steel reinforcement. In particular, the cracking becomes more critical as water binder ratio (W/B) is reduced and concrete strength increases. Therefore, it needs to evaluate correctly the comprehensive shrinkage behavior of concrete with high strength: high-strength concrete (HSC), ultra-highstrength concrete (UHSC). The unrestrained shrinkage tests, however, cannot estimate the net shrinkage effectively which affects cracking after full development of strength and stiffness because it does not consider the degree of restraint, strength development, stress relaxation, and so on. Therefore, in this study, both free and restrained shrinkage tests with variables of W/B (W/B of 30, 25 and 16%) and admixtures (fly ash (FA) and granulated blast-furnace slag (BFS)) for HSC, very-high-strength concrete (VHSC) and UHSC were performed. The test results indicated that the autogenous shrinkage and total shrinkage at drying condition were reduced as W/B increased and FA, BFS were added, and the cracking behavior was suppressed as W/B increased and FA was added.
Keywords
ultra-high-strength concrete; shrinkage; restrained stress; fly ash; granulated blast-furnace slag;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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