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 Maintenance modeling and cost assessment for repaired reinforced concrete structures exposed to chloride attack in coastal areas in Vietnam
Tác giả hoặc Nhóm tác giả: Quynh Chau Truong, Quang Trung Nguyen, CP Soueidy, E Bastidas-Arteaga
Nơi đăng: IOP Conference Series: Materials Science and Engineering; Số: 1;Từ->đến trang: 012024;Năm: 2023
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
One of the main causes that can shorten the life of concrete structures is chloride-induced corrosion of reinforcing steel. Recent research has shown that material properties, exposure conditions, and climatic conditions have a significant influence on the structural deterioration of reinforced concrete structures (RC), especially in marine environments. The objective of this work is to predict the durability of RC structures damaged by chloride-induced corrosion in coastal environments in Vietnam, considering periodic repair measures. A two-dimensional model of chloride penetration in square cross-section columns RC repaired using cover replacement techniques is investigated. Two repair methods with different shapes (orthogonal and circular) are considered. The effects of the different repair methods on the service life of the structures are examined in case studies in Vietnam that consider the variations of annual temperature and humidity in three coastal regions such as Danang, Haiphong, and Ho Chi Minh City. Finally, the maintenance and repair costs during the lifetime of the structures are calculated for each case. The study indicates that for RC structures exposed to two-dimensional chloride ingress, the most critical areas for assessing chloride concentration, predicting corrosion onset, and planning repair schedules are the corners of the columns. In addition, the chloride-induced corrosion process is strongly influenced by local weather conditions, especially in areas with high humidity. The repair method with circular concrete replacement seems to be more efficient in terms of maintenance schedule and cost than the repair method with orthogonal concrete replacement.
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