Date of Award
Civil and Environmental Engineering
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Load induced damage in plain mortar and fiber reinforced mortar starts microcracking after the stress level called 'initiation stress'. Rapid damage starts with the stress level called 'critical stress'. In this research, sonic techniques, namely Acoustic Emission (AE) and Ultrasonic Pulse Transmission (UPT), were tested for their sensitivity of the damage level. The UPT data was analyzed in time domain as well as in frequency domain. From the time domain, Ultrasonic Pulse Velocities (UPV) were calculated. From the frequency domain, Modified Attenuation Coefficients (MAC), which define the energy transfer property of the materials, were calculated. The energies of the acoustical signals were calculated form the AE data. Three different mixes were tested namely, Mortar, Steel Fiber Reinforced Mortar (SFRM) and Carbon Fiber Reinforced Mortar (CFRM). UPV, MAC and Acoustic Energies were calculated for specimens loaded both under monotonous compressive load and under cyclical compressive load. In addition to sensitivity of those methods to damage level, sensitivity of attenuation to the heterogeneities of the plain and fiber reinforced mortar specimens were analyzed. MAC was found the most sensitive method to the levels of damage and it was also found sensitive to the heterogeneity of the specimens.Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2002 .D47. Source: Masters Abstracts International, Volume: 41-04, page: 1138. Adviser: Nataliya Hearn. Thesis (M.A.Sc.)--University of Windsor (Canada), 2002.
Dervisoglu, Ozgun., "Use of attenuation to monitor load-induced damage in plain and fiber-reinforced mortars." (2002). Electronic Theses and Dissertations. 4471.