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Full-Text Articles in Engineering
Multi-Probe Conductivity Method For Monitoring Time-Dependent Processes In Fresh Cementitious And Other Dense Slurry Systems, Pavate V. Trimbak, Kamal Khayat, Carmel Jolicoeur
Multi-Probe Conductivity Method For Monitoring Time-Dependent Processes In Fresh Cementitious And Other Dense Slurry Systems, Pavate V. Trimbak, Kamal Khayat, Carmel Jolicoeur
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The invention provides a novel probe comprising multiple conductivity electrodes, which can be used to monitor various types of time-dependent processes in aqueous suspension, slurries, pastes, etc. for example, fresh cementitious materials, such as grouts, mortars and concrete. The processes which can be monitored as function of time through this novel method can be either "physical" or "chemical"; physical-type processes comprise settling, sedimentation, segregation, water migration, surface bleeding, channelling, etc.; chemical-type processes comprise dissolution or precipitation of solids, and any reactions involving the solution and solid phases present in the slurry.
Radionuclide Leaching From Residual Soils: Screening Study, Mark W. Fitch, Ellen England
Radionuclide Leaching From Residual Soils: Screening Study, Mark W. Fitch, Ellen England
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Four soil samples, collected from a National Priorities Listed site contaminated with uranium, thorium, and radium, were leached for two, seven, and 30 days. The nonleached soils, leached soils, and leachates were analyzed using gamma spectroscopy, alpha spectroscopy, and delayed neutron activation. Unleached and leached soils had low radionuclide activities, and four different leaching solutions had no significant observable effect upon the resulting leachate activity. Three of the soils produced leachates with uranium activities below the expected primary drinking water standard of 30 µg/L for uranium, but the leachate from the fourth soil had an unacceptably high concentration of uranium …
Forensic Investigation Of Failed Mast Arms Of Traffic Signal Supported Structures, Genda Chen, Michael G. Barker, D. Scott Mackenzie, Christopher W. Ramsay, Joe Alderson, Lokeswarappa R. Dharani, Jiaqing Yu
Forensic Investigation Of Failed Mast Arms Of Traffic Signal Supported Structures, Genda Chen, Michael G. Barker, D. Scott Mackenzie, Christopher W. Ramsay, Joe Alderson, Lokeswarappa R. Dharani, Jiaqing Yu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In Missouri, 11 traffic signal mast arms fractured at the arm-post weld connection in 7 years. To reduce this fatigue failure, the Missouri Department of Transportation developed a fatigue-resistant weld profile that increases the weld leg and reduces the slope of the weld at the toe. This study investigated causes of the failed arms, compared performance of new and old weld profiles, and suggested retrofitting measures for further investigation. The scope included a metallurgical investigation of one failed field mast arm, laboratory fatigue testing of five prototype mast arms (two new and three old profiles), and laboratory failure analysis of …