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Advances in Materials Science and Engineering
Volume 2014, Article ID 306459, 6 pages
http://dx.doi.org/10.1155/2014/306459
Research Article

Research on Deterioration Mechanism of Concrete Materials in an Actual Structure

1Department of Architecture Civil Engineering, Nanjing Institute of Technology, No. 1 Hongjing Road, Nanjing 211167, China
2College of Materials Science and Engineering, Nanjing University of Technology, No. 5 Xin Mofan Road, Nanjing 210009, China

Received 7 January 2014; Accepted 25 April 2014; Published 14 May 2014

Academic Editor: Osman Gencel

Copyright © 2014 Shiping Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The cause for deterioration of the concrete structure located in severe environment has been explored both in field and in laboratory. Serious cracking and spalling appeared upon surface of the concrete structure soon after the structure was put into service. Both alkali-aggregate reaction and freeze-thaw cycles may result in similar macro visible cracking and spalling. The possibility of alkali-aggregate reaction was excluded by both field survey and lab examination such as chemical analysis, petrographic analysis, and determination of alkali reactivity of aggregates. According to results of freeze-thaw cycles, impermeability testing, and microstructure analysis, it is deduced that the severe environmental conditions plus the relatively inferior frost resistance cause the deterioration of concrete. Usage of air entraining admixture can improve frost resistance and impermeability. Furthermore, new approaches to mitigate the deterioration of concrete used in severe environmental condition are discussed.