Techno Press
Techno Press

Computers and Concrete   Volume 15, Number 6, June 2015, pages 973-987
DOI: http://dx.doi.org/10.12989/cac.2015.15.6.973
 
Influence of curing condition and carbonation on electrical resistivity of concrete
In-Seok Yoon, Seongwon Hong and Thomas H.K.Kang

 
Abstract     [Full Text]
    The electrical resistivity of air-dried, saturated, and carbonated concretes with different mixture proportions was monitored to evaluate and quantify the influence of the age of the specimen, carbonation, and curing condition. After 28 days of curing, four prepared specimens were stored in a vacuum chamber with 5% CO2 for 330 days to make carbonated specimens. Four of the specimens were placed in water, and four specimens were cured in air until the end of the experiments. It was observed that the electrical resistivity of the carbonated specimens increased as carbonation progressed due to the decrease of porosity and the increase of hydrated products. Therefore, in order to estimate the durability of concrete, its carbonation depth was used as the measurement of electrical resistivity. Moreover, an increase of electrical resistivity for air-dried and saturated concretes was observed as a function of age of the specimen. From the relationship between chloride diffusivity provided by Yoon et al. (2007) and the measurements of electrical resistivity, it is expected that the results well be of significant use in calibrating chloride diffusivity based on regular measurements of electrical resistivity during concrete construction.
 
Key Words
    carbonation depth; chloride diffusivity; curing condition; durability; electrical resistivity
 
Address
In-Seok Yoon: Department of Construction Information Engineering, Induk University, 12 Choansan-ro, Nowon-gu, Seoul 139-749, Republic of Korea
Seongwon Hong : Engineering Research Institute, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea
Thomas H.K. Kang : Department of Architecture and Architectural Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea
 

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