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1. Non-ureolytic bacterial carbonate precipitation as a surface treatment strategy on cement-based materials | |||
XU Jing,YAO Wu | |||
Civil and Architectural Engineering 23 March 2013 | |||
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Abstract:Bacterially-induced caclium carbonate precipitation is a general phenomenon in nature. It has been proposed as an environment-friendly strategy for the protection of cement-based materials. This paper investigates calcium carbonate precipitation induced by non-ureolytic bacteria of genus Bacillus. Surface treatment using this biodeposition technique was evaluated by parameters affecting the durability of cement-based materials. Outcomes from this study revealed that bacterial surface treatment on specimens resulted in a pronounced decrease of capillary water absorption and increase of resistance to carbonation. This novel biological surface treatment shows promising prospect for particularly increasing durability aspects of concrete constructions. | |||
TO cite this article:XU Jing,YAO Wu. Non-ureolytic bacterial carbonate precipitation as a surface treatment strategy on cement-based materials[OL].[23 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4532976 |
2. Preparation of chloride ion selective electrode and its potential response to different chloride solutions representing concrete environments | |||
Gao Xiaojian,Zhang Jian,Yang Yingzi | |||
Civil and Architectural Engineering 13 April 2010 | |||
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Abstract:Ag/AgCl electrode was made from anodized Ag wire and the influence of anodization current density on stability of Ag/AgCl electrode was studied in this paper. Potential response of Ag/AgCl electrode was tested in synthetic concrete pore solutions with different concentrations of chloride ions and influences of sulfate, calcium, potassium and sodium ion on the potential response of Ag/AgCl electrode were also measured. The results show that Ag/AgCl electrode has the best potential stability when it is prepared with 0.4 mA/m2 of current density for 2 hours and there is no measurable potential difference among 20 electrodes prepared with such anodizing condition. The potential of Ag/AgCl electrode develops to a constant value in less than 60 seconds and maintains stable during the test period when immersed into synthetic concrete pore solution with different amount of chlorides. Ag/AgCl electrode shows a good linear potential response to a wide range of chloride concentrations from 0.005mol/L to1.0mol/L. Sulfate, calcium and sodium ions show inconsiderable influences on the potential of Ag/AgCl electrode. Therefore, it is suggested that Ag/AgCl electrodes can be used as chloride sensors in concrete exposed to different environments. | |||
TO cite this article:Gao Xiaojian,Zhang Jian,Yang Yingzi. Preparation of chloride ion selective electrode and its potential response to different chloride solutions representing concrete environments[OL].[13 April 2010] http://en.paper.edu.cn/en_releasepaper/content/41880 |
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