Shanghai International Shipping Service Center Development Co.

Shanghai, China

Shanghai International Shipping Service Center Development Co.

Shanghai, China
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Wang J.,Tongji University | Huang T.,Tongji University | Liu X.,Tongji University | Wu P.,Shanghai Maritime University | And 2 more authors.
The Scientific World Journal | Year: 2013

Experimental work was carried out to develop information about mechanical properties of recycled concrete (RC) in marine environment. By using the seawater and dry-wet circulation to simulate the marine environment, specimens of RC were tested with different replacement percentages of 0%, 30%, and 60% after immersing in seawater for 4, 8, 12, and 16 months, respectively. Based on the analysis of the stress-strain curves (SSCs) and compressive strength, it is revealed that RC' peak value and elastic modulus decreased with the increase of replacement percentage and corroding time in marine environment. And the failure of recycled concrete was speeded up with more obvious cracks and larger angles of 65° to 85° in the surface when compared with normal concrete. Finally, the grey model (GM) with equal time intervals was constructed to investigate the law of compressive strength of recycled concrete in marine environment, and it is found that the GM is accurate and feasible for the prediction of RC compressive strength in marine environment. © 2013 Jianxiu Wang et al.


Wu P.,Shanghai Maritime University | Wu P.,Shanghai International Shipping Service Center Development Co. | Wang X.,Shanghai Maritime University | Huang T.,Shanghai Maritime University | And 2 more authors.
International Journal of Electrochemical Science | Year: 2014

Experimental work was carried out to investigate the free chloride ion penetration in recycled aggregate concrete with fly ash. By using the natural diffusion method, specimens with different fly ash content of 0%,10%,20% and 30% were tested after corroding in fully saturation or wet-dry circulation for 30days,60days, 90days and 120days respectively. And then specimen was drilled with diameter of 6mm to get the powder at the depth of 1̃5mm, 6̃10mm, 11̃15mm and 16̃20mm respectively, and then the powder was put in a bottle with distilled water. After 24 hours, this solution was filtered and neutralized by the diluted sulphuric acid; after ten drops of potassium chromate indicator was put into this solution, the silver nitrate solution was added to make it brick red, and the free chloride ion concentration was obtained by a formula. Then the impact of fly ash content and corroding time on free chloride ion (FCI) concentration (by mass) was discussed respectively; and the distributions of free chloride ion with the depth were also presented. And the mechanism of free chloride ion penetration was also put forward after comparison study between fully saturation and wet-dry circulation. Finally the improved grey model was applied to predict the FCI concentration in recycled aggregate concrete with different fly ash content after validation; and it is found that the model is feasible to predict with higher accuracy; and the prediction reveals that the effect of wet-dry circulation would decline with time and 20% was the best fly ash content for the durability of recycled aggregate concrete. © 2014 The Authors.


Huang T.,Tongji University | Huang X.,China Communications Construction Company Ltd. | Wu P.,Shanghai International Shipping Service Center Development Co.
International Journal of Electrochemical Science | Year: 2014

Reviewing about the progresses of electrochemical chloride extraction (ECE) was carried out to learn more about the current achievements in ECE in this passage. Principles of ECE were introduced after the corrosion of reinforced concrete was descried. And the recent developments of ECE were summarized including the factors affecting the ECE; the impacts on the concrete microstructure, cohesion between the steel rebar and concrete, and performance of the concrete; and the side effects. Then the field tests and applications were also introduced to make a further research. The study reveals that current research were not enough to promote the wider application of ECE. And finally orientations for further research were also put forward explicitly based on this research, which would guide and facilitate the future study of ECE and enlarge its application. © 2014 The Authors. Published by ESG.

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