Theses and Dissertations

Date of Award

5-2023

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Civil Engineering

First Advisor

Dr. Philip Park

Second Advisor

Dr. Robert Jones

Third Advisor

Dr. Yoonsu (Paul) Choi

Abstract

Electrically conductive asphalt concrete is considered as a multifunctional construction material due to its structural and non-structural functions. This study aims to investigate piezoresistivity of conductive asphalt concrete. Piezoresistivity is an electrical property of some materials which electrical resistivity changes with induced strain and subsequently, it has the potential for self-sensing smart technology. Graphite Powder F-516 with various contents was added into the asphalt mixtures to impart the electrical conductivity. Electrochemical impedance spectroscopy (EIS) was selected to measure the electrical properties of the specimens in dry and wet conditions, and low and high temperatures. The impedance measurement shows that the mixtures are conductive when 30% or higher portion of traditional filler were replaced with graphite. In highly conductive specimens containing 40% or higher graphite contents, moisture content does not have significant effect on the conductivity. The temperature of specimens changes the impedance: the impedance increases with the increase of temperature. A freeze-thaw cycle raises the impedance of specimens. Material Testing System was used to perform a uniaxial compression test (monotonic loading). Significant changes in impedance with loading are observed, but it is difficult to conclude whether the impedance changes are caused by strain or by damage.

Comments

Copyright 2023 Mateo Schmit Mendoza. All Rights Reserved.

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