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Advances in Materials Science and Engineering
Volume 2014, Article ID 623467, 6 pages
http://dx.doi.org/10.1155/2014/623467
Research Article

Application of Interfacial Propagation and Kinking Crack Concept to ECC/Concrete Overlay Repair System

Shenyang Architecture and Building University, Hunnan East Road No. 9, Shenyang 110168, China

Received 1 January 2014; Revised 19 May 2014; Accepted 21 May 2014; Published 23 June 2014

Academic Editor: Juan José del Coz Díaz

Copyright © 2014 Yaw ChiaHwan and Li Wei. 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

Research on the application of ultraductile engineered cementitious composite (ECC) as overlay in the repair of deteriorated concrete structures is performed in this paper. Also, interfacial crack kinking and trapping mechanism experimentally observed in ECC/concrete overlay repair system are described by comparison of toughness and energy release rate. The mechanism involves cycles of extension, kinking, and arrest of interfacial crack into the overlay. Experimental testing of overlay repair system reveals significant improvements in load carrying capacity and ductility over conventional concrete overlay. The commonly observed overlay system failure mode of delamination or spalling is eliminated when ECC is applied. These failure modes are suppressed when ECC is used as an ideal and durable candidate overlay repair material.