TY - JOUR
T1 - Bond characteristics of quartz sand modified enamel coated steel bars with concrete
AU - Kuang, Yihang
AU - Tang, Fujian
AU - Li, Gang
AU - Lin, Weiwei
AU - Lin, Zhibin
N1 - Funding Information:
This study was supported by the National Natural Science Foundation of China (No. 52078099 and 52225804).
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/12/8
Y1 - 2023/12/8
N2 - Porcelain enamel, as a coating material, has a glassy and smooth surface that reduces the bond action with surrounding concrete when applied to steel rebar. In this work, quartz sand modified enamel (QSME) coatings are proposed for the first time to improve the bond action with concrete. The bond characteristics of QSME-coated steel bars in concrete are experimentally investigated by pull-out tests, and the effects of the size and content of quartz sand are considered. The microstructure of the steel bar/concrete interface is characterized by using a scanning electron microscope, and the surface profile is analyzed with a 3D scanner. Results show that QSME coating significantly increases the bond strength, bond stiffness, bond ductility, bond toughness, and residual bond strength of plain steel bars, which increase with an increase in the quartz sand content. The bond strength of QSME-coated deformed steel bars decreases compared with that of uncoated rebars due to the reduced rib height. However, QSME coating improves the bond stiffness, bond ductility, bond toughness, and residual bond strength of deformed steel bars. For QSME-coated steel bars, the bond strength linearly increases with an increase in the surface roughness.
AB - Porcelain enamel, as a coating material, has a glassy and smooth surface that reduces the bond action with surrounding concrete when applied to steel rebar. In this work, quartz sand modified enamel (QSME) coatings are proposed for the first time to improve the bond action with concrete. The bond characteristics of QSME-coated steel bars in concrete are experimentally investigated by pull-out tests, and the effects of the size and content of quartz sand are considered. The microstructure of the steel bar/concrete interface is characterized by using a scanning electron microscope, and the surface profile is analyzed with a 3D scanner. Results show that QSME coating significantly increases the bond strength, bond stiffness, bond ductility, bond toughness, and residual bond strength of plain steel bars, which increase with an increase in the quartz sand content. The bond strength of QSME-coated deformed steel bars decreases compared with that of uncoated rebars due to the reduced rib height. However, QSME coating improves the bond stiffness, bond ductility, bond toughness, and residual bond strength of deformed steel bars. For QSME-coated steel bars, the bond strength linearly increases with an increase in the surface roughness.
KW - Bond strength
KW - Enamel coating
KW - Pull-out test
KW - Quartz sand
KW - Surface roughness
UR - http://www.scopus.com/inward/record.url?scp=85173621985&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2023.133699
DO - 10.1016/j.conbuildmat.2023.133699
M3 - Article
AN - SCOPUS:85173621985
SN - 0950-0618
VL - 408
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 133699
ER -