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Li J.-X.,Guangdong Academy of Construction and Architecture Science | Li J.-X.,South China University of Technology | Yu Q.-J.,South China University of Technology | Wei J.-X.,South China University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2012

This paper investigates the transformation of RO phase during modification process at high temperature. Chemical analysis, analytical extraction and XRD were used to determine the effect of C/S on the transformation of RO phase. The results show that when the value of C/S is greater than 2.3, RO phase is discomposed to be f-MgO; While the value of C/S is in the range of 1.8~2.3, most of RO phase is transformed to be magnesioferrite, and while the value of C/S is less than 1.8, RO phase remains unchanged.


Zheng L.,Guangdong Academy of Construction and Architecture Science | Wei J.-X.,South China University of Technology | Yu Q.-J.,South China University of Technology | Wang X.-X.,Guangdong Academy of Construction and Architecture Science | And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2011

The chloride ion migration in concrete specimens was studied during electrochemical chloride extraction (ECE), and the energy efficiency ratio of ECE was calculated by the charge of extracted Cl - to the charge of current. The results show that the distribution of chloride ion in concrete after ECE play a convex curve, as outer-layer concrete and inner-layer concrete being with lower chloride ion concentration in comparison to middle-layer concrete. The result of energy efficiency ratio of ECE shows that at earlier stage of ECE, the greater the current density of ECE, the higher the energy efficiency ratio; while at the later stage of ECE, the smaller the current density, the higher the energy efficiency ratio.


Zhu P.,China Institute of Technology | Wang X.-X.,Guangdong Academy of Construction and Architecture Science | Wang X.-X.,South China University of Technology | Wei J.-X.,South China University of Technology | And 3 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2011

In this paper, the model of ions migration in concrete has established under the electric field. Na +, Cl - ions migration law was analyzed theoretically during the process of electrochemical chloride extraction (ECE) based on the experimental parameters, empirical constants and suitable boundary conditions. The content of Na + and Cl - ions in concrete after ECE is agree with simulating results, which shows the model of this paper is effective and reasonable. Both experimental results and simulating results indicate that distribution profile of Cl - ions in the radial direction is the convex curve under electric field, and with the max value of Cl - content appears at a certain position in concrete. With growth of the treatment time, both Cl - ions content in concrete and extracted rate of Cl - ions decline, while Na + ions gradually aggregates close to reinforcement.


Wang Y.-G.,Guangdong Academy of Construction and Architecture Science | Wei J.-X.,South China University of Technology | Wang X.-X.,Guangdong Academy of Construction and Architecture Science | Yu Q.-J.,South China University of Technology | Zheng L.,Guangdong Academy of Construction and Architecture Science
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013

The relationship between anodic polarization and corrosion state of reinforcement in concrete was studied. The results show that passivation state of reinforcement was intimately related to size of passive potential interval. When the size of passive potential interval is greater than 280 mV, the reinforcement presents excellent passivation property; while the size of passive potential interval reduces to about 250~280 mV, the reinforcement could not passive and start to corrosion. So 250~280 mV in the size of passive potential interval could seem to be critical point of depassivation of reinforcement. And chloride ion has significant influence on the depassivation time of reinforcement, depassivation time of reinforcement (t) and content of chloride ion (c) have function relationship as t=-39. 8ln(c)+84.4 in this study.

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