NDLI: Experimental Investigation on Shear Behavior of the Interface between Early-Strength Self-Compacting Shrinkage-Compensating High-Performance Concrete and Ordinary Concrete Substrate

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Experimental Investigation on Shear Behavior of the Interface between Early-Strength Self-Compacting Shrinkage-Compensating High-Performance Concrete and Ordinary Concrete Substrate

Content Provider	MDPI
Author	Du, Wenping Yang, Caiqian Backer, Hans De Li, Chen Ming, Kai Zhang, Honglei Pan, Yong
Copyright Year	2022
Description	To improve interface bonding stress, early-strength self-compacting shrinkage-compensating high-performance concrete (ESS-HPC) was selected as an excellent strengthening material to investigate by direct shear test. Tests on seventeen Z-type specimens were carried out considering the ESS-HPC and ordinary concrete substrate (OCS) compressive strength grade, the ESS-HPC curing age, the OCS surface roughness, and the ratio of steel shear dowels as the variables. A bond stress–slip model of the interface was proposed via statistical fitting. The results show that the surface roughness and ratios of steel shear dowels had the most important influence on the shear bond stress. The shear bond stress of the specimens without steel shear dowels increased by almost 15% as the ESS-HPC strength grade changed from C60 to C75. With the increase in the curing age, the shear bond stress showed a changing trend of first increasing and then decreasing. The coarser surface with the drilling method can improve the shear bond stress by 89%. To achieve a secondary increase in the shear bond stress of specimens with steel shear dowels, the minimum ratio of steel shear dowels was 0.83%. Analytical equations are proposed in combination with the CEB-FIB Model 2010 and AASHTO Model. The calculated results show reasonable agreement with the experimental results within an acceptable range.
Starting Page	4939
e-ISSN	19961944
DOI	10.3390/ma15144939
Journal	Materials
Issue Number	14
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-07-15
Access Restriction	Open
Subject Keyword	Materials Characterization and Testing of Materials Ess-hpc Ocs Shear Bond Stress Surface Roughness Bond Stress–slip
Content Type	Text
Resource Type	Article

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