Journal article
Durability of CFRP-wrapped concrete in cold regions: A laboratory evaluation of montmorillonite nanoclay-modified siloxane epoxy adhesive
Construction & building materials, Vol.290, p.123253
07/05/2021
Handle:
https://hdl.handle.net/2376/120763
Abstract
•Modified a siloxane epoxy adhesive with 1.5 wt% montmorillonite nanoclay.•This improved the adhesive’s microstructure, crosslinking, and thermal stability.•This notably increased the strength and elastic modulus of CRFP/concrete cylinders.•It also reduced the gas permeability and water absorption at the interface.•Tests were conducted for specimens before and after salt scaling in 3 wt% NaCl.
Externally bonded fiber-reinforced polymer (FRP) is a promising tool to use for either preserving the integrity of new concrete infrastructure or mitigating the deteriorations of aged concrete infrastructure. This laboratory study evaluates the durability performance of carbon FRP-wrapped concrete with a 1.5 wt% montmorillonite nanoclay (NC) modified siloxane epoxy adhesive, under a simulated cold and chloride-laden environment. Five types of concrete samples were fabricated and tested, i.e., reference concrete, FRP-wrapped concrete, NC-modified FRP-wrapped concrete, FRP/pre-aged concrete, and NC-modified FRP/pre-aged concrete, respectively. Both before and after the salt scaling test in 3 wt% NaCl, the NC-modified FRP-wrapped concrete samples exhibited notably better mechanical properties (higher compression strength and elastic modulus) and significantly better transport properties at the interface (reduced water absorption and gas permeability), related to their unmodified FRP-wrapped counterparts. These benefits of nano-modification, along with better resistance to salt scaling, are attributable to the improved microstructure and reduced hydrophilicity of the adhesive, as revealed by microscopic investigations using a high-resolution optical microscope and a water contact angle tester. The Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis revealed that the admixed NC chemically reacted with the adhesive and increased its crosslinking density and thermal stability.
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Details
- Title
- Durability of CFRP-wrapped concrete in cold regions: A laboratory evaluation of montmorillonite nanoclay-modified siloxane epoxy adhesive
- Creators
- Zhen Lei - School of Architecture and Planning, Yunnan University, Kunming, Yunnan, ChinaZhipeng Li - Department of Civil & Environmental Engineering, Washington State University, Pullman, WA 99164-2910, United StatesXiang Zhang - School of Architecture and Planning, Yunnan University, Kunming, Yunnan, ChinaXianming Shi - Department of Civil & Environmental Engineering, Washington State University, Pullman, WA 99164-2910, United States
- Publication Details
- Construction & building materials, Vol.290, p.123253
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900612854501842
- Language
- English
- Resource Type
- Journal article