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  • Development of Non-Petroleum Based Binders for Use in Flexible Pavements (TR-594)
    Principal investigators Chris Williams 515 294 4419 rwilliam iastate edu Iowa State University Student researcher Mohamed Abdel Raouf Mohamed Metwally Project status Completed Start date 08 01 08 End date 07 31 09 Publications Report Development of Non Petroleum Based Binders for Use in Flexible Pavements TR 594 4 56 mb pdf October 2011 Tech transfer summary Development of Non Petroleum Based Binders for Use in Flexible Pavements TR 594 176 72 kb pdf Oct 2011 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Most bituminous adhesives or binders that are used for pavement materials are derived primarily from fossil fuels With petroleum oil reserves becoming depleted and the drive to establish a bio based economy there is a push to produce binders from alternative sources particularly from biorenewable resources However until now no research has studied the applicability of utilizing bio oils as a bitumen replacement 100 replacement in the pavement industry The main objective of this research was to test various properties of bio oils in order to determine the applicability of using bio oils as binders in the pavement industry The overall conclusions about the applicability of

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1705579814 (2015-11-09)
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  • Evaluation of the Iowa Driver Improvement Program
    State University All rights reserved Evaluation of the Iowa Driver Improvement Program Driver improvement course Researcher s Principal investigators Konstantina Gkritza Co principal investigators Shashi Nambisan Student researcher Wei Zhang Project status Completed Start date 08 01 08 End date 07 31 09 Publications Report Evaluation of the Iowa Driver Improvement Program 2 14 mb pdf December 2009 Tech transfer summary Evaluation of Iowa s Driver Improvement Program 319 kb pdf Dec 2009 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract This study examines the effectiveness of the Iowa Driver Improvement Program DIP measured as the reduction in the number of driver convictions subsequent to the DIP The analysis involved a random sample of 9 055 drivers who had been instructed to attend DIP and corresponding data on driver convictions crashes and driver education training history that were provided by the Iowa Motor Vehicle Division The sample was divided into two groups based on DIP outcome satisfactory or unsatisfactory completion Two evaluation periods were considered one year after the DIP date probation period and the period from the 13th to 18th month after the DIP date The evaluation of the Iowa DIP showed that there is evidence of effectiveness in terms of reducing driver convictions subsequent to attending the DIP Among the 6 790 75 drivers who completed the course satisfactorily 73 of drivers had no actions and 93 were not involved in a crash during the probation period Statistical tests confirmed these numbers However the positive effect of satisfactory completion of DIP on survival time that is the time until the first conviction was not statistically significant 13 months after the DIP date Econometric model estimation results showed that regardless of the DIP outcome the likelihood of conviction occurrence and frequency of subsequent

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1261081517 (2015-11-09)
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  • Implementation of Intelligent Compaction Performance Based Specifications in Minnesota
    iastate edu Co principal investigators Max Morris mmorris iastate edu Department of Statistics Tom Cackler Heath Gieselman Pavana Vennapusa 515 294 2395 pavanv iastate edu Student researcher Jiake Zhang Project status Completed Start date 04 01 07 End date 07 31 09 Publications Report Final Report Implementation of Intelligent Compaction Performance Based Specifications in Minnesota 18 49 mb pdf July 2009 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract This study documents relationships between intelligent compaction measurement values IC MVs and various insitu point measurement techniques for monitoring compaction of non granular and granular materials Factors affecting correlations are discussed e g soil type moisture contents stress level etc Measurements from earth pressure cells document the relationship between in ground stresses for rollers and various in situ test methods Comparisons were made between test roller rut depth measurements and IC MVs and various point measurements as a quality assurance QA check for the subgrade pavement foundation layer It was concluded that IC MVs and in situ point measurements can serve as reliable alternatives to test rolling Site specific target values were calculated for IC MVs dynamic cone penetrometer DCP light weight deflectometer LWD and

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=134926669 (2015-11-09)
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  • Construction Project Administration and Management for Mitigating Work Zone Accidents and Fatalities: An Integrated Risk Management Model
    Zone Accidents and Fatalities An Integrated Risk Management Model Researcher s Principal investigators Jennifer Shane 515 294 1703 jsshane iastate edu Co principal investigators Kelly Strong 515 294 1460 kstrong iastate edu Student researcher Daniel Enz Project status Completed Start date 03 01 08 End date 06 30 09 Publications Report Construction Project Administration and Management for Mitigating Work Zone Accidents and Fatalities An Integrated Risk Management Model 1 41 mb pdf October 2009 Sponsor s partner s Sponsor s Midwest Transportation Consortium About the research Abstract The goal of this research is to mitigate the risk of highway accidents crashes and fatalities in work zones The approach of this research has been to address the mitigation of work zone crashes through the creation of a formal risk management model to be utilized during the construction management and administration of highway projects for all stages of the project life cycle The result of these efforts is realized through the design of an integrated risk management model A standard risk management model has three components risk identification risk analysis and risk response The risks are identified by the factors that contribute to work zone crashes The risk analysis involves understanding the tendency of a hazard to influence the frequency or severity of a loss and the risk response relates to the appropriate countermeasures to the factors that contribute to work zone crashes The number of hazards and mitigation strategies corresponding to work zone crashes can be substantial The intent of this research is to develop a formalized risk management plan to identify potential hazards on plans designs or jobsites and to cue a risk response to the hazards Mitigation strategies may take the form of a mitigation method alert motorist assist worker motorist control motorist inform motorist and protect worker motorist

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1216322435 (2015-11-09)
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  • Effectiveness of Special Deer Management Hunts on Deer-Vehicle Crash Reduction
    Average deer population and number of deer vehicle crashes for deer management zones in Cedar Rapids Researcher s Principal investigators Konstantina Gkritza Co principal investigators Zachary Hans 515 294 2329 zhans iastate edu Student researcher Michael Baird Project status Completed Start date 07 01 08 End date 06 30 09 Publications Report Effectiveness of Special Deer Management Hunts on Deer Vehicle Crash Reduction 8 48 mb pdf February 2010 Tech transfer summary Assessing Traffic Safety in Iowa s Urban Deer Herd Management Zones 1 13 mb pdf Feb 2010 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Many states are striving to keep their deer population to a sustainable and controllable level while maximizing public safety In Iowa measures to control the deer population include annual deer hunts and special deer herd management plans in urban areas While these plans may reduce the deer population traffic safety in these areas has not been fully assessed Using deer population data from the Iowa Department of Natural Resources and data on deer vehicle crashes and deer carcass removals from the Iowa Department of Transportation the authors examined the relationship between deer vehicle collisions deer density and land use in three urban areas in Iowa that have deer management plans in place Cedar Rapids Dubuque and Iowa City over the period 2002 to 2007 First a comparison of deer vehicle crash counts and deer carcass removal counts was conducted at the county level Further the authors estimated econometric models to investigate the factors that influence the frequency and severity of deer vehicle crashes in these zones Overall the number of deer carcasses removed on the primary roads in these counties was greater than the number of reported deer vehicle crashes on those roads These differences can be

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1929073743 (2015-11-09)
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  • Electronic Construction Collaboration - Phase 1
    cjahren iastate edu Student researcher Aaron Zutz Project status Completed Start date 07 01 08 End date 06 30 09 Publications Report Electronic Construction Collaboration Phase 1 710 kb pdf July 2009 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Bridge construction projects are becoming increasingly complex as the demand for context sensitive solutions aesthetic designs and accelerated bridge construction becomes more prevalent In addition the Iowa Department of Transportation Iowa DOT is entering a phase of design and construction of large border bridges such as the I 80 let 2008 for 56 million and US 34 bridges over the Missouri River and I 74 over the Mississippi River Compared to typical construction projects these bridges generate more contractor Requests for Information RFIs Value Engineering VE proposals Requests for Changes RFCs and shop drawings Management of these submittals is a significant challenge for Resident Construction Engineers RCEs and other Iowa DOT staff In addition some submittals require cross departmental and project consultant reviews Commercially available software exists for managing submittals and project collaboration teams in house solutions may also be possible Implementation is intended to speed construction submittal review time reduce incidence of delay

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-2040863207 (2015-11-09)
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  • Evaluation for Effective Shielding of Bridge Piers
    of Bridge Piers Truck crash at unshielded pier on I 380 March 2009 Researcher s Principal investigator Tom Maze Co principal investigator Tom McDonald Project status Completed Start date 05 15 08 End date 06 30 09 Publications Report Analysis of Safety Benefits for Shielding of Bridge Piers 5 2 mb pdf June 2009 Tech transfer summary Safety Benefits of Bridge Pier Shielding 941 kb pdf May 2009 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract The highway system in the State of Iowa includes many grade separation structures constructed to provide maximum safety and mobility to road users on intersecting roadways However these structures can present possible safety concerns for traffic passing underneath due to close proximity of piers and abutments Shielding of these potential hazards has been a design consideration for many years This study examines historical crash experience in the State of Iowa to address the advisability of shielding bridge piers and abutments as well as other structure support elements considering the offset from the traveled way A survey of nine Midwestern states showed that six states had bridge pier shielding practices consistent with those in Iowa Data used for the

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1747454055 (2015-11-09)
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  • Evaluation Framework for the Creation and Analysis of Integrated Spatially-referenced Driver-Crash Databases
    the Creation and Analysis of Integrated Spatially referenced Driver Crash Databases Researcher s Principal investigator Tim Strauss University of Northern Iowa Project status Completed Start date 01 01 07 End date 06 30 09 Publications Report Evaluation Framework for the Creation and Analysis of Integrated Spatially referenced Driver Crash Databases 366 kb pdf April 2009 Tech transfer summary Framework for Integrated Spatially Referenced Driver Crash Databases 265 pdf Apr 2009 Sponsor s partner s Sponsor s Midwest Transportation Consortium About the research Abstract This project examines the potential of and constraints on the integration of transportation safety databases in a spatially referenced geographic information systems GIS environment The project focuses specifically on the analysis of crash records and driver records The objective of such database integration is to facilitate the improved analysis of issues related to transportation safety The objective of such database integration is to facilitate improved analyses of issues related to transportation safety This report begins with a review of existing databases These include traffic records databases and other databases that may enhance safety analyses The report then outlines several existing applications which are typically in a non spatial framework of integrated databases related to transportation safety The

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1215716177 (2015-11-09)
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