China Plastics ›› 2025, Vol. 39 ›› Issue (7): 17-21.DOI: 10.19491/j.issn.1001-9278.2025.07.004

• Materials and Properties • Previous Articles     Next Articles

Preparation and performance influencing mechanism of epoxy composites for underwater concrete repair

LE Deliang1, WU Qimin2, LIN Zhonghua2, PEI Kemei1()   

  1. 1.School of Chemistry and Chemical Engineering,Zhejiang Sci?Tech University,Hangzhou 310018,China
    2.Electric Construction Group East China Survey and Design Institute Co,Hangzhou 311122,China
  • Received:2024-08-29 Online:2025-07-26 Published:2025-07-22

Abstract:

Underwater concrete repair materials are specialized substances designed for restoring submerged concrete structures. Epoxy resin, with its rapid underwater curing capability, high strength, and superior adhesion properties, serves as an ideal base material for such applications. This study developed a water⁃based epoxy adhesive system and systematically investigated the factors affecting its repair performance. The research examined the influence of component ratios, curing conditions, interface roughness, concrete strength, and surface environment on the composite material's bonding properties. Results indicated that optimal bonding strength was achieved after 7 days of underwater curing at 25 ℃, compared to shorter curing periods at higher temperatures. The study identified an optimal resin⁃to⁃curing agent ratio of 3.5∶1 and demonstrated that increased interface roughness and surface permeability significantly enhanced bonding performance. Furthermore, surface conditions such as extract presence or microorganism colonization were found to moderately affect interface adhesion. These findings provide valuable guidance for optimizing underwater concrete repair applications.

Key words: underwater concrete, repair, epoxy resin, composite materials, interface bonding performance

CLC Number: