Analysis of Different Parameters in the Electrical Resistivity Test of Concrete
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RESEARCH PAPER
Analysis of Different Parameters in the Electrical Resistivity Test of Concrete Julia W. Lencioni1 • Ronaldo A. Medeiros-Junior2 Received: 20 March 2020 / Revised: 15 July 2020 / Accepted: 11 August 2020 Ó Iran University of Science and Technology 2020
Abstract Electrical resistivity is widely used to monitor the durability of concrete structures. However, the results obtained can be misinterpreted due to the effect of several parameters on the test. Therefore, the effect of six parameters on the electrical resistivity was investigated in this article. The studied parameters were (1) the thickness of the concrete cover; (2) the contact with the concrete mold; (3) the concrete aging; (4) the chloride presence; (5) the type of cure and exposure; and (6) the position of the equipment regarding the reinforcement direction. Tests were performed on aged non-reinforced concrete specimens (5 years old) and freshly casted specimens. The results showed that variation in the thickness of the reinforcement covers from 1.5 to 3.0 cm affects the electrical resistivity measurements, independently of the w/c ratio. The contact of the concreting mold with the specimen did not influence the values of electrical resistivity, independently of the w/c ratio. The effect of the chlorides incorporated into the mass of the concrete during casting is not significant on the electrical resistivity at 28 days. The electrical resistivity was 13.2% higher in specimens cured in a moist chamber, compared to curing in an uncontrolled external environment. The electrical resistivity was no longer influenced by the steel at a minimum parallel distance of 8.0 cm. Measurements performed perpendicular to the bar were not affected. These results are very important for a better interpretation of the results of this technique. Keywords Electrical resistivity Werner method Reinforcement Curing Concrete age
1 Introduction Reinforcement corrosion is a degradation process that can affect the service life of reinforced concrete structures. The electrical resistivity of concrete is an important parameter related to this electrochemical process. Therefore, electrical resistivity has been widely used to monitor the quality of concrete in real structures [1–3]. Some correlations
& Ronaldo A. Medeiros-Junior [email protected]; [email protected] Julia W. Lencioni [email protected] 1
Department of Civil Engineering, Engineering, Architecture and Urbanism College, FEAU, Vale do Paraı´ba University, UNIVAP, Sa˜o Jose´ dos Campos, Sa˜o Paulo, Brazil
2
Civil Engineering Studies Center (CESEC), Postgraduate Program in Civil Construction Engineering (PPGECC), Federal University of Parana (UFPR), Centro Politecnico, Jardim das Americas, Curitiba, Parana, Brazil
between the probability of corrosion and electrical resistivity are proposed by different studies and standards [4, 5]. This parameter has also been used to model the service life of concrete structures [6]. The electrica
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