Comparison of Cast-In-Situ and Prefabricated UHTCC Repair Systems under Bending
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 1
Abstract
Ultrahigh-toughness cementitious composite (UHTCC) is a new type of cementitious material that is suitable for durability repair of deteriorated concrete structures. One of the key issues in this repair technology is the behavior of interfacial bonds. In this study, the bond properties between the UHTCC and the old concrete were evaluated by conducting four-point bending tests. The UHTCC was prepared using two methods: cast-in-situ and prefabrication. The test parameters include the roughness of the concrete substrate, roughness of the prefabricated UHTCC, strength of the old concrete, primer, and bonding agent. Two-way analysis of variance was used to analyze the effect of these test parameters on the bond strength. Moreover, two regression formulae were proposed to predict the flexural bond strength of the composite beams. The results showed that the flexural bond strength of the repair system tended to increase with the increase in the roughness values of the concrete substrate and prefabricated UHTCC and strength of the old concrete. However, a very high roughness could damage the interfacial zone; hence, the roughness should be controlled in a particular range. The results also revealed that suitable primers and bonding agents, e.g., polymer-modified material and fly ash–silica fume-modified material, could improve the bond strength of the interface. Moreover, double-layer bonding configurations were found to exist in the prefabricated repair system. The flexural bond strength depends on the weaker bonding plane, and the interface control needs to be considered during the design and construction. In particular, two-way analysis of variance was proven a reliable tool in evaluating the experimental results. The predicted flexural bond strength was in good agreement with the experimental value.
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Acknowledgments
The authors would like to acknowledge financial support provided by the National Natural Science Foundation of China with Grant Nos. 51508501 and 51622811, Liaoning Provincial Natural Science Foundation of China with Grant No. 20170540496, National Fundamental Research Plan (973) Project No. 2013CB035901, and Key Research Items of Liaoning Province Communications Department No. 201412-3.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 1 • January 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 27, 2017
Accepted: Jun 7, 2017
Published online: Oct 24, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 24, 2018
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