海洋潮汐区混凝土表面氯离子浓度的时变规律及多因素模型

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Abstract In order to overcome the limitation that existing models cannot take into account the coupling effect of binder type and exposure time on the environmental action of concrete in tidal zone, a multi-factor time-varying model for surface chloride concentration of concrete was developed based on a total of 631 sets of field data selected from tidal zone. The influences of exposure time and material factors on surface chloride concentration of concrete in tidal zone was analyzed first. Then the multi-factor time-varying law of surface chloride concentration was corrected by introducing the time factor and the stability coefficient. Moreover, the unknown coefficients of multi-factor time-varying model were determined by means of the two-stage regression analysis method, while a multi-factor time-varying model for surface chloride concentration of concrete which takes into account the coupling effect of binder type and exposure time was developed. Finally, the proposed model was validated by comparing with the exis-ting models and field data, which indicates that the proposed model is of high applicability and it can comprehensively takes into account the coupling effect of water-to-binder ratio, type of binder and exposure time.

Key words： concrete tidal zone surface chloride concentration coupling effects multi-factor model

Published: 25 November 2019

CLC number:

TU375

Fund:This work was financially supported by the National Natural Science Foundation of China (51678165, 51668008, 51738004) and Guangxi Natural Science Foundation (2018GXNSFAA281344).

About author:: Chang Chen received his master’s degree in structural engineering from Guangxi University in 2019. His research interest is the durability of marine concrete structures.
Lyufeng Yang received his Ph.D. degree in structural engineering at Wuhan University of Technology in 1998. He is currently a professor and Ph.D. supervisor in School of Civil Engineering and Architecture, Guangxi University. His research interests are the durability of structural concrete, design and optimization of enginee-ring structure bearing capacity, and structural reliability and system reliability.
Bo Yu received his Ph.D degree in Structural Enginee-ring at Guangxi University in 2011. He is currently a professor and Ph.D. supervisor in School of Civil Engineering and Architecture, Guangxi University. His main research directions are quantitative durability analysis and design of concrete structures, deterioration mechanism and safety assessment of concrete structures, and stochastic analysis and risk assessment of engineering structures.

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Cite this article:

CHEN Chang,YANG Lyufeng,YU Bo. Multi-factor Model and Time-varying Law for Surface Chloride Concentrationof Concrete in Marine Tidal Zone[J]. Materials Reports, 2019, 33(Z2): 321-326.

URL:

http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2019/V33/IZ2/321

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