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Experimental Investigation on Shear Behavior of the Interface between Early-Strength Self-Compacting
Wenping Du1,2, Caiqian Yang1,3, Hans De Backer2
1Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 210096, China.
Materials (Basel, Switzerland)
|July 27, 2022
Summary
Early-strength self-compacting concrete enhances bonding stress in direct shear tests. Surface roughness and steel dowels significantly impact shear bond, with optimal ratios improving performance.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Improving interface bonding stress is crucial for structural strengthening.
- Early-strength self-compacting shrinkage-compensating high-performance concrete (ESS-HPC) offers potential as a strengthening material.
Purpose of the Study:
- To investigate the interface bonding stress between ESS-HPC and ordinary concrete substrate (OCS) using direct shear tests.
- To analyze the influence of various factors on shear bond stress and propose a bond stress-slip model.
Main Methods:
- Direct shear tests were performed on seventeen Z-type specimens.
- Variables included concrete strength grade, curing age, surface roughness, and steel shear dowel ratio.
- Statistical fitting was used to develop a bond stress-slip model.
Main Results:
- Surface roughness and steel shear dowel ratio were the most influential factors on shear bond stress.
- Increased ESS-HPC strength (C60 to C75) boosted shear bond stress by ~15% without dowels.
- A coarser surface achieved via drilling improved shear bond stress by 89%.
Conclusions:
- A minimum steel shear dowel ratio of 0.83% is recommended for enhanced shear bond stress.
- Analytical equations were developed based on CEB-FIB Model 2010 and AASHTO Model, showing good agreement with experimental data.
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