基于极化曲线的磷酸镁水泥体系中钢筋锈蚀行为研究
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摘要
通过磷酸镁水泥体系和普通水泥中的钢筋锈蚀的对比实验,利用电化学工作站,分析钢筋锈蚀过程中的开路电位和极化曲线,研究了磷酸镁水泥体系的钢筋锈蚀行为。同时利用光学显微镜观察了不同龄期的磷酸镁水泥中钢筋的锈蚀形貌。结合磷酸镁水泥水化过程中pH值的变化和极化曲线理论深究了磷酸镁水泥体系抗钢筋锈蚀能力的机理。研究表明,磷酸镁水泥具有很强的抗钢筋锈蚀能力。磷酸镁水泥体系中的钢筋锈蚀行为虽然存在,但是其发展非常缓慢。磷酸镁水泥pH值的变化以及弱碱环境中磷酸铵金属络合物的形成是磷酸镁水泥抗钢筋锈蚀能力的控制因素。
The open circuit potential and polarization characteristics of reinforcing bar during corrosion were analyzed and the corrosion behavior of reinforcing bar in magnesium phosphate cement(MPC) was investigated, in which electrochemical workstation was used for comparison of reinforcing bar corrosion behaviors in MPC and ordinary cement. Meanwhile, the corrosion morphology of reinforcing bar in MPC at different ages of concrete was observed under optical microscope. Moreover, the mechanism of resistance of reinforcing bar in MPC to corrosion was explored based on pH changes and polarization curve theory during MPC hydration. Research demonstrated the strong resistance of MPC reinforcing bar to corrosion. There was corrosion behavior within reinforcing bar in MPC, but the corrosion rate was extremely slow. The pH changes of MPC and formation of ammonium phosphate metal complex in weak base environment were thought to be control factors of resistance of reinforcing bar in MPC to corrosion.
The open circuit potential and polarization characteristics of reinforcing bar during corrosion were analyzed and the corrosion behavior of reinforcing bar in magnesium phosphate cement(MPC) was investigated, in which electrochemical workstation was used for comparison of reinforcing bar corrosion behaviors in MPC and ordinary cement. Meanwhile, the corrosion morphology of reinforcing bar in MPC at different ages of concrete was observed under optical microscope. Moreover, the mechanism of resistance of reinforcing bar in MPC to corrosion was explored based on pH changes and polarization curve theory during MPC hydration. Research demonstrated the strong resistance of MPC reinforcing bar to corrosion. There was corrosion behavior within reinforcing bar in MPC, but the corrosion rate was extremely slow. The pH changes of MPC and formation of ammonium phosphate metal complex in weak base environment were thought to be control factors of resistance of reinforcing bar in MPC to corrosion.
引文
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[25] Shi C,Yang J,Yang N,et al.Effect of waterglass on water stability of potassium magnesium phosphate cement paste[J].Cement & Concrete Composites,2015,53:83-87.
[26] Ji Y S,Zhao W,Zhou M.Corrosion current distribution of macro cell and microcell of steel bar in concrete exposed to chloride environments[J].Construction and Building Materials,2013,47:104-110.
[2] Yang J M,Shi C J,Chang Y,et al.Hydration and hardening characteristics of magnesium potassium phosphate cement paste containing composite retarders[J].Journal of Building Materials,2013,16(1):43-49.
[3] Li Y,Chen B.Factors that affect the properties of magnesium phosphate cement[J].Construction and Building Materials,2013,47(5):977-983.
[4] Soudee E,Pera J.Influence of magnesia surface on the setting time of magnesia-phosphate cement[J].Cement and Concrete Research,2002,32(1):153-157.
[5] Mestres G,Ginebra M.Novel magnesium phosphate cements with high early strength and antibacterial properties[J].Acta Biomaterialia,2011,7(4):1853-1861.
[6] Sarkar A K.Phosphate cement-based fast-setting binders[J].American Ceramic Society Bulletin,1990,69(2):234-238.
[7] Fabio B,Duarte M V F,Fernandez R M.Bond behaviour of straight,hooked,U-shaped and headed bars in cracked concrete[J].Structural Concrete,2016,17( 5):799-810
[8] Zhu C X,Chang X,Men Y D,et al.Modeling of grout crack of rockbolt grouted system[J].International Journal of Mining Science and Technology,2015,25(3):73-77.
[9] Johannes P D V,Gideon P A G V Z,Algurnon S V R.Bond of deformed steel reinforcement in lightweight foamed concrete[J].Structural Concrete,2017,18(3):496-506.
[10] Robert P M J,Bhupinder S.Bond behaviour of normal- and high-strength recycled aggregate concrete [J].Structural Concrete,2015,16(1):56-70.
[11] Seehra S,Gupta S,Kumar S.Rapid setting magnesium phosphate cement for quick repair of concrete pavements-characterisation and durability aspects[J].Cement and Concrete Research,1993,23(2):254-266.
[12] Prosen E M.Refractory materials for use in making dental casting:US Patent 2,152,152[P].1939.
[13] Prosen E M.Refractory material suitable for use in casting dental investments:US Patent 2,209,404 [P].1941.
[14] Ou S B,Wang L G,Wang P P,et al.Numerical analysis of seepage flow characteristic of collapse column under the influence of mining[J].International Journal of Mining Science and Technology,2013,(2):8-11.
[15] Earnshaw R.Investments for casting cobalt-chromium alloys,part I[J].Br Dent J,1960,108:389-396.
[16] Michalowski T,Pietrzyk A.A thermodynamic study of stuviter+water system[J].Talanta,2006,68(3):594-601.
[17] Ma H,Xu B.Potential to design magnesium potassium phosphate cement paste based on an optimal magnesia-to-phosphate ratio[J].Materials and Design,2017,118(3):81-88.
[18] Lahalle H,Coumes C C D,Mesbah A,et al.Investigation of magnesium phosphate cement hydration in diluted suspension and its retardation by boric acid[J].Cement and Concrete Research,2017,87(9):77-86.
[19] Viani A,Peréz-Estébanez M,Pollastri S,et al.In situ synchrotron powder diffraction study of the setting reaction kinetics of magnesium-potassium phosphate cements[J].Cement and Concrete Research,2015,79:344-352.
[20] You C,Qian J,Qian J,et al.Effect of early hydration temperature on hydration product and strength development of magnesium phosphate cement (MPC) [J].Cement and Concrete Research,78,Part B,2015:179-189.
[21] Gardner L,Bernal S,Walling S,et al.Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag[J].Cement and Concrete Research,2015,74:78-87.
[22] Xu B,Ma H,Li Z.Influence of magnesia-to-phosphate molar ratio on microstructures,mechanical properties and thermal conductivity of magnesium potassium phosphate cement paste with large water-to-solid ratio[J].Cement and Concrete Research,2015,68:1-9.
[23] Ma H,Xu B,Liu J,et al.Effects of water content,magnesia-to-phosphate molar ratio and age on pore structure,strength and permeability of magnesium potassium phosphate cement paste[J].Materials & Design,2014,64:497-502.
[24] Ma H,Xu B,Li Z.Magnesium potassium phosphate cement paste:degree of reaction,porosity and pore structure[J].Cement and Concrete Research,2014,65:96-104.
[25] Shi C,Yang J,Yang N,et al.Effect of waterglass on water stability of potassium magnesium phosphate cement paste[J].Cement & Concrete Composites,2015,53:83-87.
[26] Ji Y S,Zhao W,Zhou M.Corrosion current distribution of macro cell and microcell of steel bar in concrete exposed to chloride environments[J].Construction and Building Materials,2013,47:104-110.
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