Service Life Prediction Model of Concrete Square Piles in Marine Environment

doi:10.11908/j.issn.0253-374x.2016.09.010

Home > Archive>Volume 44, Issue 9, 2016 >1371-1376. DOI:10.11908/j.issn.0253-374x.2016.09.010

Service Life Prediction Model of Concrete Square Piles in Marine Environment
DOI:
                        10.11908/j.issn.0253-374x.2016.09.010
                    
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                        LI JingpeiLI Jingpei
Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; College of Civil Engineering, Tongji University, Shanghai 200092, China
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LI HeLI He
Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; College of Civil Engineering, Tongji University, Shanghai 200092, China
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Abstract:

A diffusion equation of chloride ion in concrete was put forward based on Fick's second law. In the equation, the influences of timedependence of chloride diffusivity, the effect of load on diffusion coefficient and chloride ion binding capacity of concrete were taken into consideration. A prediction model of service life of reinforced concrete (RC) square piles was established. The effects of cover thickness, cracking width, surface chloride ion concentration and the chloride threshold level on service life of RC square piles were analyzed. The analysis results indicate that the diffusion equation of chloride ion of this paper agrees well with the experimental data. It suggests that the cover thickness should be greater than 45 mm and the cracking width should not be greater than 0.1 mm if the design service life of RC square piles is 50 years.

Key words:durability of concrete; reinforced concrete square piles; chloride diffusion; service life

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LI Jingpei, LI He. Service Life Prediction Model of Concrete Square Piles in Marine Environment[J].同济大学学报(自然科学版),2016,44(9):1371~1376

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Received:May 18,2015
Revised:June 27,2016
Adopted:June 23,2016
Online: October 10,2016
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