TY - JOUR
T1 - Experimental study on factors influencing ERC-NSC interface bonding performance
AU - Sun, Nannan
AU - Song, Yifan
AU - Hou, Wei
AU - He, Shuanhai
AU - Lin, Weiwei
N1 - Funding Information:
This study is sponsored by the Natural Science Basic Research Program of Shaanxi (Grant 2021JM-174). The financial support is gratefully appreciated. The assistance for Aalto University and Chang'an University is also appreciated. The financial support to the first author provided by the China Scholarship Council is also appreciated.
Funding Information:
This study is sponsored by the Natural Science Basic Research Program of Shaanxi (Grant 2021JM-174). The financial support is gratefully appreciated. The assistance for Aalto University and Chang’an University is also appreciated. The financial support to the first author provided by the China Scholarship Council is also appreciated.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12
Y1 - 2022/12
N2 - 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.
AB - 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.
KW - Bond
KW - Bridge
KW - Cohesion
KW - Epoxy resin concrete (ERC)
KW - Friction
KW - Normal strength concrete (NSC)
UR - http://www.scopus.com/inward/record.url?scp=85139596618&partnerID=8YFLogxK
U2 - 10.1016/j.engfailanal.2022.106819
DO - 10.1016/j.engfailanal.2022.106819
M3 - Article
AN - SCOPUS:85139596618
VL - 142
JO - ENGINEERING FAILURE ANALYSIS
JF - ENGINEERING FAILURE ANALYSIS
SN - 1350-6307
M1 - 106819
ER -