Chloride-induced durability deterioration mechanism at interface between CFRP and pitting-corroded steel with optimized surface preparation

Lianheng Cai, Muye Yang, Shigenobu Kainuma, Yan Liu

研究成果: ジャーナルへの寄稿学術誌査読

抄録

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.

本文言語英語
論文番号137409
ジャーナルConstruction and Building Materials
441
DOI
出版ステータス出版済み - 8月 30 2024

!!!All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 建築および建設
  • 材料科学一般

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