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http://dx.doi.org/10.14190/JRCR.2021.9.3.268

Electrical Resistivity of ITZ According to the Type of Aggregate  

Kim, Ho-Jin (Department of Architectural Engineering, Mokwon University)
Bae, Je Hyun (Graduate School of Analytical Science and Technology, Chungnam National University)
Jung, Young-Hoon (Department of Architectural Engineering, Mokwon University)
Park, Sun-Gyu (Department of Architectural Engineering, Mokwon University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.3, 2021 , pp. 268-275 More about this Journal
Abstract
The three factors that determine the strength of concrete are the strength of cement paste, aggregate and ITZ(Interfacial Transition Zone) between aggregate and cement paste. Out of these, the strength of ITZ is the most vulnerable. ITZ is formed in 10~50㎛, the ratio of calcium hydroxide is high, and CSH appears low ratio. A high calcium hydroxide ratio causes a decrease in the bond strength of ITZ. ITZ is due to further weak area. The problem of ITZ appears as a more disadvantageous factor when it used lightweight aggregate. The previous study of ITZ properties have measured interfacial toughness, identified influencing factors ITZ, and it progressed SEM and XRD analysis on cement matrix without using coarse aggregates. also it was identified microstructure using EMPA-BSE equipment. However, in previous studies, it is difficult to understand the microstructure and mechanical properties. Therefore, in this study, a method of measuring electrical resistance using EIS(Electrochemical Impedance Spectroscopy) measuring equipment was adopted to identify the ITZ between natural aggregate and lightweight aggregate, and it was tested the change of ITZ by surface coating of lightweight aggregate with ground granulated blast furnace slag. As a result, the compressive strength of natural aggregate and lightweight aggregate appear high strength of natural aggregate with high density, surface coating lightweight aggregate appear strength higher than natural aggregate. The electrical resistivity of ITZ according to the aggregate appeared difference.
Keywords
ITZ(interfacial transition zone); EIS(electrochemical impedance spectroscopy); Lightweight aggregate; Phase angle;
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Times Cited By KSCI : 1  (Citation Analysis)
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