Masters Theses


"A new concept for the design of coaxial cables was previously proposed and developed at the University of Missouri--Rolla (UMR). These sensors were designed based on the change in topology of the cable structure when the cable is subjected to strain effects. They were shown 10~50 times more sensitive than commercially available technology with communication cables. This study focuses on the implementation issues of coaxial cable crack sensors, including manufacturability, predictability, and environmental effects. These issues are discussed to further advance the emerging technology towards its commercialization and implementation for crack monitoring and detection in reinforced concrete (RC) structures. Topics discussed in this thesis include a plasma sprayed coating of a coaxial cable sensor, correlation between the reflection coefficient and the crack width, temperature and moisture effects, and interference of steel reinforcing bars with the electromagnetic field used for time-domain reflectometry measurements. Test results have shown that the sprayed coating can significantly enhance the uniformity of coaxial cable sensors and thus the quality of measured data. With controlled crack tests, the peak reflection coefficient was found to have linear regions after the initial cracking of the beam, related to the width of a crack in the test range. This study will also address the ability of these sensors to perform under field conditions. Furthermore, the interference by the adjacent steel bars is negligible even when a coaxial sensor is nearly in contact with a reinforcing bar"--Abstract, page iii.


Chen, Genda

Committee Member(s)

Myers, John J.
Pommerenke, David


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


National Science Foundation (U.S.)


Financial support to complete this study was provided in part by the National Science Foundation (NSF) under award No. CMS0409420 and industrial support through the NSF Industry/University Cooperative Research Center on Repair of Buildings & Bridges with Composites (RB2C) at UMR.


Missouri University of Science and Technology

Publication Date

Summer 2008


x, 57 pages

Note about bibliography

Includes bibliographical references (page 39).


© 2008 Michael Allen Brower, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Coaxial cables
Reinforced concrete construction -- Earthquake effects -- Testing
Smart materials -- Testing

Thesis Number

T 9399

Print OCLC #


Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

Share My Thesis If you are the author of this work and would like to grant permission to make it openly accessible to all, please click the button above.