Wang, J, Basheer, PAM orcid.org/0000-0002-0835-8029, Nanukuttan, SV et al. (1 more author) (2014) Monitoring the development of microcracks in reinforced concrete caused by sustained loading and chloride induced corrosion. In: Grantham, M, Basheer, PAM, Magee, B and Soutsos, M, (eds.) Concrete Solutions - Proceedings. 5th International Conference on Concrete Repair, 01-03 Sep 2014, Belfast, Northern Ireland. CRC Press , Queen's University Belfast , pp. 603-609. ISBN 9781138027084
Abstract
Chloride-induced corrosion of steel in reinforced concrete structures is one of the main problems affecting their durability and it has been studied for decades, but most of them have focused on concrete without cracking or not subjected to any structural load. In fact, concrete structures are subjected to various types of loads, which lead to cracking when the tensile stress in concrete exceeds its tensile strength. Cracking could increase transport properties of concrete and accelerate the ingress of harmful substances (Cl-, O2, H2O, CO2). This could initiate and accelerate different types of deterioration processes in concrete, including corrosion of steel reinforcement. The expansive products generated by the deterioration processes themselves can initiate cracking. The success of concrete patch repairs can also influence microcracking at the interface as well as the patch repair itself. Therefore, monitoring the development of microcracking in reinforced concrete members is extremely useful to assess the defects and deterioration in concrete structures. In this paper, concrete beams made using 4 different mixes were subjected to three levels of sustained lateral loading (0%, 50% and 100% of the load that can induce a crack with width of 0.1 mm on the tension surface of beams - F0.1) and weekly cycles of wetting (1 day)/drying (6 days) with chloride solution. The development of microcracking on the surface of concrete was monitored using the Autoclam Permeability System at every two weeks for 60 weeks. The ultrasonic pulse velocity of the concrete was also measured along the beam by using the indirect method during the test period. The results indicated that the Autoclam Permeability System was able to detect the development of microcracks caused by both sustained loading and chloride induced corrosion of steel in concrete. However, this was not the case with the ultrasonic method used in the work (indirect method applied along the beam); it was sensitive to microcracking caused by sustained loading but not due to corrosion.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Taylor & Francis Group. This is an Accepted Manuscript of a book chapter published by Routledge in Concrete Solutions on 18 August 2014, available online: https://www.crcpress.com/9781138027084. Uploaded in accordance with the publisher's self-archiving policy. |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Oct 2016 14:31 |
Last Modified: | 16 Jan 2018 05:07 |
Published Version: | https://www.crcpress.com/9781138027084 |
Status: | Published |
Publisher: | CRC Press |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:105787 |