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Experimental Study on Bond Performance of NC-UHPC Interfaces with Different Roughness and Substrate Strength
Boshan Zhang1, Jiangjiang Yu1,2, Weizhen Chen1
1Department of Bridge Engineering, Tongji University, Shanghai 200092, China.
Materials (Basel, Switzerland)
|April 13, 2023
Summary
Interfacial roughness is key for strong bonds between normal concrete (NC) and ultra-high performance concrete (UHPC). Optimizing roughness enhances tensile bond strength, but its effect on shear bonds needs more study.
Area of Science:
- Civil Engineering
- Materials Science
Background:
- Investigating the bond between normal concrete (NC) and ultra-high performance concrete (UHPC) is crucial for advanced construction.
- Understanding interfacial performance is vital for structural integrity and durability.
Purpose of the Study:
- To analyze the bond failure performance between precast NC and cast-in-situ UHPC.
- To determine the influence of interfacial roughness on tensile and shear bond strength.
Main Methods:
- Conducted 72 pull-off tests for tensile bond strength.
- Performed 36 bi-shear tests for shear bond strength.
- Evaluated six interface treatments and two NC strength levels.
Main Results:
- Interfacial roughness significantly enhances tensile bond strength between NC and UHPC, showing a positive linear relationship.
- Higher base concrete strength benefits tensile bond performance.
- The influence of interface morphology can offset the benefits of higher concrete strength in shear bonding with high roughness.
Conclusions:
- Specific interfacial roughness is essential for reliable NC-UHPC bonding.
- Further research is needed to characterize roughness effects on shear bond performance.
- Optimizing interface treatments is key for maximizing bond strength in composite structures.
