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Articles 91 - 98 of 98
Full-Text Articles in Civil Engineering
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 3: Nonmetallic Reinforcement, Robert J. Frosch, Christopher P. Mosley, Ahmet Koray Tureyen
Performance-Related Specifications For Concrete Bridge Superstructures, Volume 3: Nonmetallic Reinforcement, Robert J. Frosch, Christopher P. Mosley, Ahmet Koray Tureyen
JTRP Technical Reports
In Volume 3 of the final report, research work conducted to investigate the behavior of fiber reinforced polymer (FRP) reinforcement is summarized. This study focused on the behavior of FRP reinforced concrete structures with an emphasis on bond and shear. For the bond investigation, three series of beam splice tests were performed on specimens reinforced with steel, glass FRP, and aramid FRP to determine the effect of the different types of reinforcement on bond, cracking, and deflections. The test results indicate that the use of FRP reinforcement leads to lower bond strengths and, therefore, require longer development lengths. The specimen …
Scour Monitoring Of Indiana Streams, Dennis A. Lyn, Thomas J. Cooper, Yong-Kon Yi, Rahul N. Sinha, A. Ramachandra Rao
Scour Monitoring Of Indiana Streams, Dennis A. Lyn, Thomas J. Cooper, Yong-Kon Yi, Rahul N. Sinha, A. Ramachandra Rao
JTRP Technical Reports
The project examines the survivability and reliability of fixed-in-place continuous scour monitors for possible use in Indiana streams. The report considers primarily the experience with a sonar device at the US52 crossing of the Wabash River. Although very large flow events did not occur over the project period, the device has survived a number of smaller events, and has operated continuously without failure due to physical damage. Further, the data obtained, after appropriate processing, were examined for their credibility in terms of their correlation with a hydrologic parameter, the stage. A reasonably strong correlation was found, suggesting that the recorded …
Sign Retroreflectivity Study, Austin Lyons Bischoff, Darcy M. Bullock
Sign Retroreflectivity Study, Austin Lyons Bischoff, Darcy M. Bullock
JTRP Technical Reports
Signing is a big yearly cost to state DOT’s in sign maintenance and replacement costs. In 2001 the Indiana Department of Transportation (INDOT) replaced 14,930 signs at a cost of $1,067,931 and did maintenance work on 34,084 signs at a cost of $2,136,076. Recently, guidelines have been proposed by the Federal Highway Administration (FHWA) for minimum retroreflectivity of traffic signs for state, county, and city roads in the United States. The purpose of this study was to evaluate if the majority of the signs currently used by INDOT will meet the new minimum requirements proposed by the FHWA. In addition, …
Counting Device Selection And Reliability: Synthesis Study, Srinivas Peeta, Pengchang Zhang
Counting Device Selection And Reliability: Synthesis Study, Srinivas Peeta, Pengchang Zhang
JTRP Technical Reports
Accuracy in traffic data detection is important for transportation operations and planning. Currently, inductive loop detectors are the most commonly used traffic counting devices in the field. New technologies are being developed to meet growing data counting and traffic surveillance needs. They include passive infrared, active infrared, passive magnetic, Doppler microwave, radar, passive acoustic, pulse and Doppler ultrasonic and video image processor. However, the relatively recent, but widespread, emergence of these technologies and the consequent sparseness in information on their performance characteristics preclude traffic agencies from making informed choices in the selection of traffic counting devices. This study performs a …
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 …
Public Perceptions Of The Midwest’S Pavements: Policies And Thresholds, David Kuemmel, Richard Robinson, Ronald C. Sonntag, Robert J. Griffin, James K. Giese
Public Perceptions Of The Midwest’S Pavements: Policies And Thresholds, David Kuemmel, Richard Robinson, Ronald C. Sonntag, Robert J. Griffin, James K. Giese
Marketing Faculty Research and Publications
A 5-year, pooled fund study with the Iowa, Minnesota, and Wisconsin departments of transportation assessed the public's perceptions of pavement improvement strategies and developed thresholds of satisfaction using the departments' physical indices, such as pavement ride and condition on rural, two-lane highways in the states. Approximately 3,600 drivers in the three states were involved in the three phases of the project, which included 18 focus groups, 400 statewide surveys in each state, and 2,300 targeted surveys across the three states. A multidisciplinary team from Marquette University and a mass media survey lab conducted the studies. A summary of focus group …