Correlating the Chloride Diffusion Coefficient and Pore Structure of Cement-Based Materials using Modified Noncontact Electrical Resistivity Measurement
Abstract
The electrical resistivity of hardened cement-based materials was measured in this work by a modified noncontact electrical resistivity measurement (MN-CM). The resistivity was further processed to compute the chloride diffusion coefficient (Dρ) using the Nernst-Einstein equation. Also, the rapid chloride migration test (RCM) was carried out to obtain the chloride migration coefficient (DRCM), and the relationship between Dρ and DRCM has been established. The obtained Dρ was further correlated to the pore structure parameters characterized by low-field nuclear magnetic resonance (NMR) spectroscopy. The results show that the DRCM is more sensitive to the change of pore connectivity, while Dρ is more sensitive to the change of porosity. The Dρ is smaller than DRCM since it strictly follows the Nernst-Einstein equation while RCM neglects the other driving forces such as capillary sorption and concentration gradient. It is concluded that the proposed MN-CM can obtain the chloride diffusion coefficient of saturated cement-based materials in a quick, stable, and reliable manner.
Recommended Citation
R. He et al., "Correlating the Chloride Diffusion Coefficient and Pore Structure of Cement-Based Materials using Modified Noncontact Electrical Resistivity Measurement," Journal of Materials in Civil Engineering, vol. 31, no. 3, American Society of Civil Engineers (ASCE), Mar 2019.
The definitive version is available at https://doi.org/10.1061/(ASCE)MT.1943-5533.0002616
Department(s)
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Chloride diffusion coefficient; Electrical resistivity; Formation factor; Low-field nuclear magnetic resonance (NMR); Pore structure
International Standard Serial Number (ISSN)
0899-1561; 1943-5533
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2019 American Society of Civil Engineers (ASCE), All rights reserved.
Publication Date
01 Mar 2019
Comments
The financial support from the Ministry of Science and Technology of the People's Republic of China (973 Program) (Grant No. 2015CB655103) and the National Natural Science Foundation of China (Grant Nos. 51578497 and 51678529) is gratefully acknowledged.