Theses and Dissertations

Date of Award

8-2021

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Civil Engineering

First Advisor

Dr. Philip Park

Second Advisor

Dr. Jong-min Kim

Third Advisor

Dr. Thang Pham

Abstract

Electrically conductive concrete has various potential non-structural functions such as self-sensing, de-icing, and electromagnetic shielding. Since conductive concrete is a composite containing moisture and discrete conductive additives, its electrical properties are very complex. Understanding these properties is the fundamental requirement for developing its non-structural applications. In this research, graphite powder is used as a conductive additive with varying percentages (0% to 30%) by cement paste volume. Both AC impedance analysis and DC measurement are performed in both wet and dry conditions. The results show that the resistivity measured by DC are not consistent because of polarization before/during the measurement. On the other hand, the AC measurements yield consistent results. The resistivity of concrete is lower in wet conditions than in dry conditions. The AC impedance spectroscopy shows that conductive concrete behaves like a circuit made of resistor and capacitor, and the capacitance causes polarization. Various impedance circuits were tested, and the best equivalent circuits for the conductive concrete in dry and wet conditions were proposed based on the simulation results.

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