Abstract
Geopolymer binders have good potential in the repair of existing concrete structures due to their superior durability and mechanical performances. Understanding the interfacial transition zone (ITZ) between geopolymer mortars and ordinary Portland cement concrete is a crucial step to implement such an environmentally-friendly technology. This paper focuses on the failure modes of the bond interface and the microscopic and chemical interactions between various geopolymer mortars and concrete substrates at ITZs. The occurrence of newly-formed gels and second hydration mechanisms at ITZs are analyzed and discussed. © 2021 Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Article number | 103991 |
| Journal | Cement and Concrete Composites |
| Volume | 119 |
| Online published | 26 Feb 2021 |
| DOIs | |
| Publication status | Published - May 2021 |
| Externally published | Yes |
Funding
The authors would like to acknowledge the financial support received from the Hong Kong-Guangzhou Technology and Innovation Partnership Program (Project No. 201807010055), Hong Kong RGC General Research Fund (Project No. 15219919) National Science Foundation of China (NSFC) (Project No. 51638008), the Hong Kong Polytechnic University Ph.D. studentship awarded to the second author, and finally, the Hong Kong Ph.D. Fellowship Scheme (HKPFS) awarded to the third author.
Research Keywords
- Alkali-activated binders
- Bond strength
- Interfacial transition zone (ITZ)
- Strengthening
RGC Funding Information
- RGC-funded