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Interface Shear Strength at Various Joint Types in High-Strength Precast Concrete Structures.
Young-Jin Kim1, Won-Jong Chin1, Se-Jin Jeon2
1Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea.
Materials (Basel, Switzerland)
|October 3, 2020
Summary
This study investigated the interface shear strength of precast concrete joints. Key findings show that joint filler strength significantly impacts wet joints, while compressive strength and lateral stress are crucial for dry joints.
Area of Science:
- Civil Engineering
- Structural Engineering
- Materials Science
Background:
- Precast concrete construction offers advantages over cast-in-place methods.
- Joint behavior in precast structures is critical for overall integrity and safety.
Purpose of the Study:
- To investigate the interface shear strength of high-strength precast concrete members.
- To analyze the influence of various parameters on joint shear behavior.
Main Methods:
- Push-off tests were conducted on precast concrete members.
- Variables included compressive strength, joint condition (dry/wet), shear key details, joint width, filler type, curing temperature, and lateral stress.
Main Results:
- Failure loads increased significantly with higher compressive strength and lateral stress in dry joints (14-140%).
- Wet joint strength was highly dependent on filler material, with ultra-high-strength concrete filler outperforming high-strength mortar.
- Test results were compared against JSCE and AASHTO predictive equations.
Conclusions:
- The study provides insights into factors affecting precast concrete joint shear strength.
- An improved coefficient for the JSCE equation is proposed for better prediction across various conditions.
- Findings aid in the design and safety assessment of precast concrete structures.
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