Journal
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
Volume 36, Issue 16, Pages 1764-1780Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01694243.2021.1984086
Keywords
Modified epoxy resin; CFRP; strengthening effect; interface bonding strength; flexural strength
Funding
- National Natural Science Foundation of China [51908182]
- Natural Science Foundation of Hebei Province [E2020202043]
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This paper investigates the mechanical performance of concrete strengthened by modified epoxy resin bonded CFRP, showing that CFRP significantly enhances the bearing capacity and flexural strength of concrete. Increasing the number of CFRP layers linearly increases the bearing capacity of concrete, with low-density concrete benefiting more from CFRP reinforcement than high-density concrete.
Mechanical performance of concrete strengthened by modified epoxy resin bonded CFRP (carbon fiber reinforced polymer) is present in this paper, with particular focus on the interface bond strength and flexural strength. A type of modified epoxy resin adhesive which bonds CFRP sheets to strengthen plain concrete was developed. The interface bond strength between CFRP and concrete and the flexural strength of CFRP reinforced concrete were comprehensively tested. The influence of the CFRP size, number of CFRP bonding layers, and concrete strength was further analyzed. The results showed that CFRP significantly improved the maximum bearing capacity, displacement and failure energy of plain concrete. The bearing capacity of plain concrete improved almost linearly with an increasing number of CFRP layers. CFRP-reinforced low-density concrete has a better strengthening effect than high-density concrete. The final strength and failure energy of the CFRP-reinforced concrete increased significantly, compared to that of plain concrete. A model for calculating the maximum flexural strength of reinforced concrete structures is proposed.
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