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1. Uniaxial Compressive Test of Steel Fiber And Nano-silica Modified Crumb Rubber Concrete And Damage Constitutive Model | |||
ZHANG Tao,WANG Yihong,GAO Danying | |||
Civil and Architectural Engineering 25 September 2019 | |||
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Abstract:According to six groups of crumb rubbers concrete (CRC) with different steel fibers volume ratios and nano-silica contents (SFNS-CRC) under uniaxial test, discussing the effect of steel fiber and nano-silica content. Through data collection and analysis, a computational model for the Compressive strength and Modulus of elasticity on SFNS-CRC is proposed. Based on Weibull distribution and the hehypothesis of strain equivalence, one damage constitutive model was proposed by introducing one damage threshold parameters. Test results indicate that Relationship between compressive strength and Modulus of elasticity is different from natural concrete, but is similar to CRC. Regression formula of compressive strength, Modulus of elasticity, and the damage model curves are suggested. | |||
TO cite this article:ZHANG Tao,WANG Yihong,GAO Danying. Uniaxial Compressive Test of Steel Fiber And Nano-silica Modified Crumb Rubber Concrete And Damage Constitutive Model[OL].[25 September 2019] http://en.paper.edu.cn/en_releasepaper/content/4749693 |
2. 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 |
3. 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 |
4. Influences on Compressive Strength of Ultra-High Performance Concrete Incorporating Coarse Aggregate | |||
YANG Juan,PENG Gaifei,GAO Yuxin,WANG Bin | |||
Civil and Architectural Engineering 29 August 2012 | |||
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Abstract:In this paper, Ultra-high performance concrete (UHPC) incorporating coarse aggregate was prepared with common raw materials. An experimantal investigation was conducted on the influencing factors on compressive strength of ultra-high performance concrete, including water to binder ratio (W/B), particle size range of coarse aggregate, fine modulus of sand, dosage of binder materials, types and dosage of mineral admixtures, steel fiber. The results indicated that, all the factors tested affected compressive strength of concrete, especially the W/B and mineral admixtures. With the lower W/B, incorporating mineral admixtures and using high-performance superplasticizer, UHPC incorporating coarse aggregate can be prepared successfully with the compressive strength about 150MPa. Further research results on the mechanical properties of UHPC will be reported recently. | |||
TO cite this article:YANG Juan,PENG Gaifei,GAO Yuxin, et al. Influences on Compressive Strength of Ultra-High Performance Concrete Incorporating Coarse Aggregate[OL].[29 August 2012] http://en.paper.edu.cn/en_releasepaper/content/4487896 |
5. 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 |
6. Piezoresistivity of carbon fiber reinforced cement-matrix composites | |||
Zhao Xiaohua,Li Guobao,Wang Yulin,Li Gengying | |||
Civil and Architectural Engineering 09 February 2010 | |||
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Abstract:Both positive and negative piezoresistivity occur in cement-matrix composites containing short carbon fibers due to the variation of moisture content in the composites. For most cases the electrical resistivity of the composites decreases monotonically upon longitudinal compression, and piezoresistivity tends to be positive. However, its magnitude varies. Lower moisture content leads to stronger piezoresistivity. When moisture content is in a specific range, the electrical resistivity of the composites increases monotonically upon compressive strain, and piezoresistivity tends to be negative. This effect is much stronger than positive piezoresistivity. The transition from positive to negative piezoresistivity is observed. It is proposed that the occurrence of these phenomena is attributable to decreases in both pore network connectivity and capillary porosity during compression. | |||
TO cite this article:Zhao Xiaohua,Li Guobao,Wang Yulin, et al. Piezoresistivity of carbon fiber reinforced cement-matrix composites[OL].[ 9 February 2010] http://en.paper.edu.cn/en_releasepaper/content/40099 |
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