Abstract
Bonding of carbon fiber reinforced polymer (CFRP) plates to a concrete member is a widely used strengthening method. CFRP plates used in construction degrade due to harsh environmental conditions such as high temperature or alkaline solution seepage from concrete. However, the adhesive between CFRP plates and concrete may have a positive effect on the durability performance of CFRP plates. In this paper, the long-term performance of both naked and adhesive coated CFRP pultruded plates subjected to different-temperature water or alkaline solution (20, 40 and 60 °C) are investigated to evaluate the protective effect of adhesive on CFRP plates. It is found that the adhesive coating can slow the deterioration of mechanical properties especially the tensile properties and fiber-matrix interfacial properties. The water absorption mechanism of CFRP plates was also investigated.
Highlights
Fiber reinforced polymers are accepted as construction materials due to their outstanding performance and resistance to corrosion compared with concrete and steel [1]
It is believed that the water uptake of FRP composites plays a key role in the degradation of their mechanical and thermal properties, especially in water [11,12], alkaline solution [6,13] and salt solutions [14,15]
5a and 20 °C Alkali-C in Figure 5d stand for the naked specimen immersed in 20 °C water and coated specimen immersed in 20 °C alkaline solution, respectively
Summary
Fiber reinforced polymers are accepted as construction materials due to their outstanding performance and resistance to corrosion compared with concrete and steel [1]. Water diffusion in FRP composites in a hygrothermal environment may cause the swelling of the FRP materials [23] and localized strain and stress and subsequently the degradation of the bonding between the fiber and resin matrix [8,10]. This may seriously affect the mechanical performance of FRP composites [10].
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