Intermediate Crack Debonding of Polymer Cement Mortar Overlay-Strengthened RC Beam
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 6
Abstract
The bond behavior at the polymer cement mortar (PCM)-concrete interface particularly affects the structural behavior of overlay-strengthened slabs or beams, and the debonding of the PCM overlay was one of the major failure modes. The design procedure of PCM overlay to strengthen an RC element should avoid these premature debonding failures. Because no reliable design method for retrofitting with the PCM overlay is currently available for the practitioner, a need exists to understand the mechanism of the PCM overlay debonding process to prevent failure. This paper presents an analytical approach for a PCM overlay-strengthened beam failed by intermediate crack (IC) debonding. The limit of transferred shear force along the PCM-concrete interface to avoid any occurrence of debonding is analytically provided. The reliability and accuracy of the proposed analytical procedure have been successfully verified by knowing the ratio of analytical and experimental strength of the PCM-strengthened beams compiled in a bending test database, which has a mean value of 1.10 and a standard deviation of 0.14.
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Acknowledgments
This study is a part of the International Collaborative Research, “Life Cycle Prediction and Management of Concrete Structures” adopted by the Asia-Africa Science and Technology Strategic Cooperation Promotion Program of Special Coordination Funds for Science and Technology of Japan’s Ministry of Education, Culture, Sports, Science, and Technology. Dr Kouichi Satoh of the Research Institute of the Nara Construction Co., Ltd., is sincerely acknowledged for providing the authors with details of his test database.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 6 • June 2011
Pages: 857 - 865
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 13, 2010
Accepted: Nov 30, 2010
Published online: Dec 3, 2010
Published in print: Jun 1, 2011
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