Chloride permeability in cement-based materials based on DC/AC methods

QIAN Peng; XU Qianjun

doi:10.16511/j.cnki.qhdxxb.2018.25.003

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (2) : 198-203. DOI: 10.16511/j.cnki.qhdxxb.2018.25.003

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Chloride permeability in cement-based materials based on DC/AC methods

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Abstract

The chloride permeability of cemented materials saturated with solutions of deionized water or 1 mol/L NaCl was measured using the rapid chloride permeability test (RCPT) and electrical impedance spectroscopy (EIS). The results show that as the water-cement ratio increases, the passed charge and the resistance of continuous conduction paths (R₁) increase, indicating that a reduced anti-chloride penetration ability. The RCPT tests showed that the passed charge and temperature rise of the specimens saturated with different solutions were almost the same for a given water-cement ratio. However, the EIS tests showed that the initial currents in the NaCl saturated samples were higher than in the water saturated samples. DC/AC tests showed a strong power relation between R₁ and the passed charge and a linear relationship between R₁ and the passed initial current. Thus, the initial current can be used to calculate the chloride diffusion coefficient and to evaluate the permeability more accurately with the passed charge.

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cement-based material / chloride permeability / electrical impedance spectroscopy

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QIAN Peng, XU Qianjun. Chloride permeability in cement-based materials based on DC/AC methods[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(2): 198-203 https://doi.org/10.16511/j.cnki.qhdxxb.2018.25.003

References

[1] SHI X, XIE N, FORTUNE K, et al. Durability of steel reinforced concrete in chloride environments:An overview[J]. Construction & Building Materials, 2012, 30(5):125-138.[2] 冯乃谦, 邢锋. 混凝土与混凝土结构的耐久性[M]. 北京:机械工业出版社, 2009. FENG N Q, XING F. Durability of concrete and concrete structure[M]. Beijing:China Machine Press, 2009. (in Chinese)[3] 赵铁军. 混凝土渗透性[M]. 北京:科学出版社, 2005. ZHAO T J. Concrete permeability[M]. Beijing:Science Press, 2005. (in Chinese)[4] ASTM C1202-97. Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration[S]. Philadelphia:American Society for Testing and Materials, 1997.[5] ZHANG T, Gjørv O E. An electrochemical method for accelerated testing of chloride diffusivity in concrete[J]. Cement & Concrete Research, 1994, 24(8):1534-1548.[6] LU X. Application of the Nernst-Einstein equation to concrete[J]. Cement & Concrete Research, 1997, 27(2):293-302.[7] KHITAB A, LORENTE S, OLLIVIER J P. Predictive model for chloride penetration through concrete[J]. Magazine of Concrete Research, 2005, 57(9):511-520.[8] YANG C C, CHIANG S C, WANG L C. Estimation of the chloride diffusion from migration test using electrical current[J]. Construction & Building Materials, 2007, 21(7):1560-1567.[9] SNYDER K A, FERRARIS C, MARTYS N S, et al. Using impedance spectroscopy to assess the viability of the rapid chloride test for determining concrete conductivity[J]. Journal of Research of the National Institute of Standards & Technology, 2000, 105(4):497-509.[10] CABEZA M, MERINO P, MIRANDA A, et al. Impedance spectroscopy study of hardened Portland cement paste[J]. Cement and Concrete Research, 2002, 32(6):881-891.[11] DÍAZ B, NÓVOA X R, PÉREZ M C. Study of the chloride diffusion in mortar:A new method of determining diffusion coefficients based on impedance measurements[J]. Cement & Concrete Composites, 2006, 28(3):237-245.[12] DÍAZ B, FREIRE L, MERINO P, et al. Impedance spectroscopy study of saturated mortar samples[J]. Electrochimica Acta, 2008, 53(25):7549-7555.[13] MERCADO H, LORENTE S, BOURBON X. Chloride diffusion coefficient:A comparison between impedance spectroscopy and electrokinetic tests[J]. Cement and Concrete Composites, 2012, 34(1):68-75.[14] SONG G. Equivalent circuit model for AC electrochemical impedance spectroscopy of concrete[J]. Cement & Concrete Research, 2000, 30(11):1723-1730.[15] LIZARAZO-MARRIAGE J, HIGUERA C, CLAISSE P. Measuring the effect of the ITZ on the transport related properties of mortar using electrochemical impedance[J]. Construction & Building Materials, 2014, 52(2):9-16.[16] 吴立鹏. 表层混凝土氯离子扩散性能及其测试方法研究[D]. 北京:清华大学, 2011. WU L P. Research on the chloride diffusivity of near-surface concrete and its testing method[D]. Beijing:Tsinghua University, 2011. (in Chinese)[17] ELKEY W. Electrical resistivity of concrete[J]. Concrete International, 1995, 37(5):41-46.