Interface Shear Strength between Self-Compacting Concrete and Carbonated Concrete
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
An experimental test is proposed to investigate the interface shear strength between carbonated concrete substrate and self-compacting concrete (SCC) overlay. Thirty-nine Z-type specimens consisting of two L-type concrete members were designed and subjected to direct shear test. One L-type concrete member was cast as substrate and carbonated. Then the SCC was cast as overlay. The effects of carbonation of substrate, strength of SCC overlay, and interfacial treatment on shear strength were discussed and clarified. A coefficient was developed to consider the influence of carbonation on the shear strength prediction between old concrete substrate and new SCC overlay. Results showed that carbonation of substrate affects both the interface shear strength and cracking. The shear strength increased by 30% when the carbonation depth of substrate was deeper than 20 mm. The location of shear crack was changed from the bonding interface to the interface between the carbonated and uncarbonated layers within the substrate. The strength of new self-compacting concrete and the interface treatment also affected the interface shear strength. For specimens without interfacial planted bars, the shear strength increased with the strength of SCC overlay until it was more than 5 MPa greater than that of the substrate. The strength of SCC overlay, however, had negligible effect on the shear strength of specimens reinforced with interfacial planted bars.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The work reported here was conducted with financial support from the National Natural Science Foundation of China (Grant nos. 51708477 and 51678069), the Project Funded by China Postdoctoral Science Foundation (Grant nos. 2018T110837 and 2017M620350), and the Special Funds for the Construction of Innovative Provinces in Hunan, China (Nos. 2019SK2171 and 2018GK5028). The support is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Nov 18, 2018
Accepted: Dec 16, 2019
Published online: Mar 18, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 18, 2020
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