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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. The Mechanism of Explosive Spalling and Measures to Resistant Spalling of Concrete Exposed to High Temperature by Incorporating Fibers | |||
YANG Juan,PENG Gaifei | |||
Civil and Architectural Engineering 30 August 2012 | |||
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Abstract:This paper summarizes two main explosive spalling mechanisms (Vapor pressure build-up mechanism and Thermal stress mechanism) of concrete at elevated temperature, and also presents the measures to resistant the explosive spalling, i.e. by incorporating fibers (polypropylene fiber(PPF), steel fiber(SF) and hybrid fiber of the first two). Vapor pressure build-up mechanism is known as that high-dense internal structure and not-connected capillary channel of HPC hold back water vapor escaping rapidly out of pores during heating, vapor pressure thus come into being. Thermal stress mechanism is deemed to that inner heat transfer of concrete at high temperature is not uniform because of thermal inertia of concrete, temperature gradients form, and then produce thermal stress, which rises with the increasing temperature. When thermal stress reaches to a certain value and forms the tensile stress in excess of tensile strength of concrete itself, explosive spalling occurs. Finally, the further studies of both the mechanism and the measures are proposed. Also, the preliminary study of ultra high-strength concrete (UHSC) on fire-resistance are mentioned. | |||
TO cite this article:YANG Juan,PENG Gaifei. The Mechanism of Explosive Spalling and Measures to Resistant Spalling of Concrete Exposed to High Temperature by Incorporating Fibers[OL].[30 August 2012] http://en.paper.edu.cn/en_releasepaper/content/4488129 |
3. 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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