Experimental study on factors influencing ERC-NSC interface bonding performance. (December 2022)

• Record Type: Journal Article
• Authors: Sun, Nannan; Song, Yifan; Hou, Wei; He, Shuanhai; Lin, Weiwei
• Is Part Of: Engineering failure analysis. Volume 142(2022)
• Publication Date: 2022-12
• Subjects: Epoxy resin concrete (ERC) -- Normal strength concrete (NSC) -- Bond -- Friction -- Cohesion -- Bridge; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2022.106819
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: The interfacial bond performance of the ERC-NSC is sufficient for rehabilitation of concrete components. The saturated surface dry surface treatment is unfavorable for the bond properties of ERC-NSC interface. The 25° inclined angle is recommended for the slant shear test of ERC-NSC specimens. The recommended cohesion and friction coefficient can be used to predict the bond strength of the ERC-NSC interface. Abstract: The short-term behavior and long-term durability of materials for structural strengthening are significantly affected by their bond properties and compatibility with the existing substrate. In this study, the bonding performance between a normal strength concrete (NSC) substrate and an epoxy resin concrete (ERC) layer was investigated by applying direct tensile, splitting tensile, bi-shear, and slant shear tests, and the interfacial bond strength and corresponding failure modes were explored. Several factors that may affect the interfacial bond strength, including the ERC age, substrate moisture degree, and interface inclination angle, were examined to explore their influences. The results reveal that the increase in ERC age resulted in various degrees of increment for the bond strength among the four tests. The saturated surface dry (SSD) preparation method slightly increased the bond strength by 3 % in the splitting tensile tests. However, moisture at the substrate interface reduced the bond values by 25.5 %, 29.67 %, and 16.9 % in the direct tensile, bi-shear, and slant shear tests, respectively. As the inclination angle increased, the bonding strength of the slant shear test increased, while a larger inclination angle reduced the likelihood of interfacial failure. Furthermore, the minimum cohesion and shear friction coefficients were determined to be 2.26 MPa and 1.68 for air surface dry preparation and 1.62 MPa and 1.48 for SSD preparation.