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Title |
Evaluation of Setting Delay in Mortar Adding Superplasticizer Using Electrical Resistivity Measurement
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Authors |
이한주(Hanju Lee) ; 임홍재(Hong Jae Yim) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.009 |
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Keywords |
전기비저항 ; 모르타르 ; 유동화제 ; 비파괴평가 ; 응결시점 Electrical resistivity ; Mortar ; Nondestructive method ; Setting time ; Superplasticizer |
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Abstract |
According to the development and use of self-consolidating concrete in field, interest in material properties of early-age concrete is rising. Setting time with hydration process of cement is one of significant indicator to evaluate the early-age material properties of concrete, various nondestructive methods including penetration resistance measurement have been proposed to estimate setting time. This study performed an experimental approach to evaluate setting time delay in mortar adding superplasticizer using electrical resistivity measurement. For this purpose, total nine types of mortar samples were prepared, and its electrical resistivity was monitoring during 24h after mixing. From the experimental result, rising time of electrical resistivity was used to evaluate setting delay of mortar, and penetration resistance was also measured for comparison. In addition, dynamic elastic modulus and compressive strength of 1day mortar were measured to investigate a possibility the use of electrical resistivity measurement for evaluation of early-age material properties.
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