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

doi:10.16511/j.cnki.qhdxxb.2018.25.003

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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.

Keywords cement-based material chloride permeability electrical impedance spectroscopy

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TV331

Issue Date: 15 February 2018

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	QIAN Peng
	XU Qianjun

Cite this article:

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.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2018.25.003 OR http://jst.tsinghuajournals.com/EN/Y2018/V58/I2/198

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