Assessing the impact of carbonation on the CFRP-mortar bond: A combined mechanical and microstructural analysis
Year: 2025
Type: article
Abstract: Research on reinforcement and repair techniques for infrastructure weakened by environmental factors has been extensive, with a focus on evaluating their mechanical behaviour. One promising method in civil engineering is the use of bonded composite reinforcements, which offer a wide range of applications. When the structure is repaired or strengthened, concrete has been exposed to environmental actions for years, thus the external layer is likely to be carbonated. This study investigates the influence of initial carbonation on the adhesive bond between concrete and carbon fiber-reinforced polymer (CFRP) systems. In this experimental study, cement mortar specimens were exposed to accelerated carbonation conditions at a CO 2 concentration of 3 %. Mechanical tests were conducted on both control and carbonated samples to assess changes in adhesive properties. Pull-out tests showed that carbonation and surface preparation methods significantly improved bond strength. Notably, the bond strength showed a significant increase of 30 % within 60 days of accelerated carbonation. Carbonation improves the compressive strength of concrete by producing calcium carbonates. This study shows that, in infrastructure rehabilitation projects especially in areas with high CO₂ exposure, taking advantage of natural carbonation before applying CFRP can improve bond performance and overall durability as well as sustainability.
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,540
OpenAlex ID: W7077038528