Mo, Yi-Lung2020-01-04May 20192019-05May 2019https://hdl.handle.net/10657/5758Past studies have demonstrated the use of self-consolidating carbon nanofiber concrete (SCCNFC) as a structural sensor which led to the development of carbon nanofiber aggregates (CNFAs). Many researchers have adopted the four probe technique to measure DC electrical resistance variation of concrete composites like CNFAs to study the effect of stimuli on structures. In this research, four probe CNFAs were modified into two-probe, and its response in circuits with DC and AC (20Hz to 300kHz) inputs for loaded and non-loaded states were compared. The study was further extended with the optimization of AC frequency and carbon nanofiber (CNF) content to achieve a maximum and reliable response from CNFAs in response to various stimuli. The optimized CNFAs were then tested to develop waterproof CNFAs with the outer coating. The study finally gave the optimized waterproof CNFA to be used in an AC circuit of optimized frequency that can be implemented in reliable and consistent real-time structural health monitoring.application/pdfengThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).Carbon Nanofiber AggregateCNFAOptimizationWaterproofingCarbon nanofibersCNFStructural health monitoringPolarization2020-01-04Thesisborn digital