Bond Behaviors between UHPC and Normal-Strength Concrete: Experimental Investigation and Database Construction
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 1
Abstract
This study builds a large database from an extensive survey of existing bond strengths between ultrahigh-performance concrete (UHPC) and normal-strength concrete (NC), with total 563 specimens being collected. To make up for some factors not included in the existing tests, an additional 38 specimens were tested with the improved slant shear method to enrich the database. The four governing factors for the interface strength were identified from the test results of the total specimens: compressive strengths of UHPC and NC materials, interface roughness, normal stress level, and casting sequence. It is highlighted that this work discusses the effect of casting sequence. To obtain an accurate prediction formula, an artificial neural network (ANN) model is constructed, where the effect of casting sequence was firstly introduced. Based on the trained ANN model, an explicit formula is presented that significantly minimizes the prediction error. A modified shear-friction formula is also proposed for the UHPC–NC interface shear strength. Compared with other calculation models for concrete interface strength, this proposed formula with multiple parameters has a better accuracy.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was supported by the National Natural Science Foundation (51778137). It was also supported by Shanghai Engineering Research Center of High Performance Composite Bridges (19DZ2254200) and Zhishan Youth Scholar Program of Southeast University.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 17, 2020
Accepted: May 20, 2021
Published online: Oct 26, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 26, 2022
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