Influence That Seasonal Variation in State of Include Concrete Water Exerts on Characteristic of Carbonation Process of Underground Structure

Fujikura, Norio; Iwasaki, Hideki; Fukute, Tsutomu; Shibata, Satoshi; Suzuki, T.

doi:10.2208/jsceje.65.564

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2017

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“…Adopted mean value shown in Table is used to predict the end of the initiation stage for each group. Although recent research reported that water on the concrete surface affects the progress of carbonation, this study neglects such local water actions for the sake of simplicity.…”

Section: System Detailsmentioning

confidence: 99%

Management system of preventive maintenance and repair for reinforced concrete subway tunnels

Ishida

Kawabata²,

Maruyama³

et al. 2017

Structural Concrete

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The authors propose a maintenance management system for reinforced concrete subway tunnels to perform efficient maintenance management in view of preventive maintenance and repair of distressed concrete. The proposed system consists of three subsystems and has been put into trial use on an actual subway line. Based on the deterioration prediction using numerical models coupled with on-site measurement information, priorities, and timings are assigned to repair work based on the thresholds uniquely determined by the company, and maintenance management plans are created within imposed budget constraints. Through a couple of case studies on corrosion of reinforcing bars used for the actual structure, the proposed system is shown to be capable of predicting deterioration propagation almost approximately. Further, it is also demonstrated to be helpful to calculate maintenance management cost and to make an appropriate maintenance management plan under various repair strategies.

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Section: System Detailsmentioning

confidence: 99%