Relating the Electrical Resistance of Fresh Concrete to Mixture Proportions

被引:11
作者
Obla, K. [1 ]
Hong, R. [1 ]
Sherman, S. [1 ]
Bentz, D. P. [2 ]
Jones, S. Z. [2 ]
机构
[1] Natl Ready Mixed Concrete Assoc, 900 Spring St, Silver Spring, MD 20910 USA
[2] NIST, Engn Lab, 100 Bur Dr Stop 8615, Gaithersburg, MD 20899 USA
来源
ADVANCES IN CIVIL ENGINEERING MATERIALS | 2018年 / 7卷 / 01期
关键词
cement content; electrical resistance; formation factor; mixture proportions; paste content; porosity; resistivity; water-cement ratio; water content;
D O I
10.1520/ACEM20170126
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Characterization of fresh concrete is critical for assuring the quality of the United States' constructed infrastructure. While fresh concrete arriving at a job site in a ready-mixed concrete truck is typically characterized by measuring temperature, slump, unit weight, and air content, here the measurement of the electrical resistance of a freshly cast cylinder of concrete is investigated as a means of assessing mixture proportions, specifically cement and water contents. Both cement and water contents influence the measured electrical resistance of a sample of fresh concrete: the cement by producing ions (chiefly potassium, sodium, and hydroxide) that are the main source of electrical conduction and the water by providing themain conductive pathways through which the current travels. Relating the measured electrical resistance to attributes of the mixture proportions, such as water-cement ratio by mass (w/c), is explored for a set of eleven different concrete mixtures prepared in the laboratory. In these mixtures, w/c, paste content, air content, fly ash content, high range water reducer dosage, and cement alkali content are all varied. Additionally, concrete electrical resistance data are supplemented by measuring the resistivity of its component pore solution obtained from five laboratory-prepared cement pastes with the same proportions as their corresponding concrete mixtures. Only measuring the concrete electrical resistance can provide a prediction of the mixture's paste content or the product w*c; conversely, when pore solution resistivity is also available, w/c and water content of the concrete mixture can be reasonably assessed.
引用
收藏
页码:71 / 86
页数:16
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