TY - JOUR
T1 - Chloride-induced durability deterioration mechanism at interface between CFRP and pitting-corroded steel with optimized surface preparation
AU - Cai, Lianheng
AU - Yang, Muye
AU - Kainuma, Shigenobu
AU - Liu, Yan
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/8/30
Y1 - 2024/8/30
N2 - This study investigated the chloride-induced durability deterioration mechanism at the interface of carbon fiber reinforced polymer (CFRP) and steel joints exposure to wet-dry cycling environment, using 27 specimens with varying corrosion levels of steel and aging periods of bonded joints. Characterization including macro and microscale observation, quantification of topographical structure, analysis of surface wettability and adherent residues, were employed to understand the steel surface conditions and their relationship with durability performance under prolonged wet-dry cycles. The results indicated that various steel surface characteristics influenced the interface in both the short and long terms; however, the priority shifted from topography for new steel to cleanliness for corroded steel. As the corrosion level of the steel increased with the aging period, notable declines were observed in the joint's ultimate capacity (∼33.4 %) and its displacement (∼9.94 %) in general responses, along with decreases in maximum slip (∼31.0 %) and shorter plateaus in local responses. This corresponded to an undesirable shift in the triggering failure mode at the ends. Additionally, deterioration mechanism encompassed “foreign attacks” as external factors, marked by corrosion at the bonding edges and inward capillary diffusion of chloride ions, and “domestic unrest” as internal factors, exemplified by the development of those adherent chloride/rust residues, weakening steel-adhesive bonds, and risk of separation. Finally, a time-dependent environmental reduction factor for the capacity model was proposed and verified using collected test data.
AB - This study investigated the chloride-induced durability deterioration mechanism at the interface of carbon fiber reinforced polymer (CFRP) and steel joints exposure to wet-dry cycling environment, using 27 specimens with varying corrosion levels of steel and aging periods of bonded joints. Characterization including macro and microscale observation, quantification of topographical structure, analysis of surface wettability and adherent residues, were employed to understand the steel surface conditions and their relationship with durability performance under prolonged wet-dry cycles. The results indicated that various steel surface characteristics influenced the interface in both the short and long terms; however, the priority shifted from topography for new steel to cleanliness for corroded steel. As the corrosion level of the steel increased with the aging period, notable declines were observed in the joint's ultimate capacity (∼33.4 %) and its displacement (∼9.94 %) in general responses, along with decreases in maximum slip (∼31.0 %) and shorter plateaus in local responses. This corresponded to an undesirable shift in the triggering failure mode at the ends. Additionally, deterioration mechanism encompassed “foreign attacks” as external factors, marked by corrosion at the bonding edges and inward capillary diffusion of chloride ions, and “domestic unrest” as internal factors, exemplified by the development of those adherent chloride/rust residues, weakening steel-adhesive bonds, and risk of separation. Finally, a time-dependent environmental reduction factor for the capacity model was proposed and verified using collected test data.
KW - CFRP
KW - Chloride/rust residues
KW - Deterioration mechanism
KW - Durability
KW - Pitting-corroded steel
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U2 - 10.1016/j.conbuildmat.2024.137409
DO - 10.1016/j.conbuildmat.2024.137409
M3 - Article
AN - SCOPUS:85199041926
SN - 0950-0618
VL - 441
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 137409
ER -