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CLC number: TU528

On-line Access: 2011-06-06

Received: 2011-01-15

Revision Accepted: 2011-06-07

Crosschecked: 2011-08-19

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.9 P.692-701

10.1631/jzus.A1100006


One and two dimensional chloride ion diffusion of fly ash concrete under flexural stress


Author(s):  Yun-sheng Zhang, Wei Sun, Zhi-yong Liu, Shu-dong Chen

Affiliation(s):  Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing 211189, China

Corresponding email(s):   zhangys279@163.com

Key Words:  Fly ash, Concrete, Flexural stress, Chloride ion, One and two dimension


Yun-sheng Zhang, Wei Sun, Zhi-yong Liu, Shu-dong Chen. One and two dimensional chloride ion diffusion of fly ash concrete under flexural stress[J]. Journal of Zhejiang University Science A, 2011, 12(9): 692-701.

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author="Yun-sheng Zhang, Wei Sun, Zhi-yong Liu, Shu-dong Chen",
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%A Zhi-yong Liu
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%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1100006

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T1 - One and two dimensional chloride ion diffusion of fly ash concrete under flexural stress
A1 - Yun-sheng Zhang
A1 - Wei Sun
A1 - Zhi-yong Liu
A1 - Shu-dong Chen
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Y1 - 2011
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1100006


Abstract: 
A preloading frame is firstly designed to accurately apply external flexural stress to concrete specimens. Then a method is developed to measure one and two dimensional (1D and 2D) chloride ion concentrations at different distances from the surface of concrete under flexural stress. Using this method and the preloading frame, 1D and 2D stress-diffusion is systematically investigated for fly ash concretes made with different fly ash contents (0%, 10%, 20%, 40%, and 60%), and water to binder ratios (0.3, 0.35, and 0.4). The stress accelerating effect on 1D and 2D chloride ion diffusion is also quantitatively analyzed through a comparison between stress-diffusion and nonstress-diffusion. A diffusion accelerating effect caused by external flexural stress can clearly be observed through the comparison. In order to quantify the stress accelerating effect, a stress accelerating factor is proposed in this paper. The relationship between stress accelerating factor and external stress-to-ultimate stress ratio is given as an exponential function. Finally, the process of the initiation, prorogation, and distribution of microcracks on the tensile face of specimen is observed in-situ by using a small-sized loading frame and scanning electron microscope (SEM). The above research provides an insight into chloride attack on the edge reinforcing bars of concrete structures under flexural stress, such as large-span beam and board in the field of civil engineering.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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