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Bonding Properties between Fly Ash/Slag-Based Engineering Geopolymer Composites and Concrete
Baogui Wang1,2, Hu Feng1, Hao Huang3
1Yellow River Laboratory, Zhengzhou University, Zhengzhou 450001, China.
Materials (Basel, Switzerland)
|June 28, 2023
Summary
This study investigates engineering geopolymer composites (EGCs) for concrete repair, finding that bond strength improves with interface roughness and specific fiber reinforcement. The research establishes a bond-slip model for EGCs bonded to existing concrete structures.
Area of Science:
- Materials Science and Engineering
- Civil Engineering
- Structural Repair
Background:
- Concrete infrastructure repair is challenging, necessitating advanced materials for structural longevity.
- Engineering Geopolymer Composites (EGCs) show promise for rapid structural repair.
- The interfacial bonding performance between existing concrete and EGCs requires thorough investigation.
Purpose of the Study:
- To develop EGCs with superior mechanical properties for concrete repair.
- To evaluate the bonding performance of EGCs with existing concrete substrates.
- To analyze the microstructural characteristics influencing bond strength.
Main Methods:
- Tensile bonding and single shear bonding tests were conducted to assess bond strength.
- X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were used for microstructural analysis.
- A bond-slip model was developed based on experimental data.
Main Results:
- Bond strength increased with interface roughness.
- Polyvinyl alcohol (PVA)-fiber EGCs showed increased bond strength with higher fly ash (FA) content and water-binder ratio.
- Polyethylene (PE)-fiber EGCs exhibited minimal change in bond strength with FA content variation but decreased bond strength with increased water-binder ratio.
Conclusions:
- Interface roughness is a critical factor for EGC-concrete bonding.
- Fiber type (PVA vs. PE) significantly influences EGC bond performance and response to FA content and water-binder ratio.
- Microstructural analysis (XRD, SEM) revealed insights into C-S-H gel formation and fiber-matrix interactions affecting mechanical properties and ductility.
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