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  • Asset Management and Safety: A Performance Perspective
    8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Asset Management and Safety A Performance Perspective Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Co principal investigators Konstantina Gkritza Neal Hawkins 515 294 7733 hawkins iastate edu Basak Aldemir Bektas 515 294 4033 basak iastate edu Project status Completed Start date 09 01 09 End date 03 31 11 Publications Report Asset Management and Safety A Performance Perspective 3 18 mb pdf October 2012 Tech transfer summary Asset Management and Safety A Performance Perspective 221 30 kb pdf Oct 2012 Sponsor s partner s Sponsor s Midwest Transportation Consortium About the research Abstract Incorporating safety performance measures into asset management can assist transportation agencies in managing their aging assets efficiently and improve system wide safety Past research has revealed the relationship between individual asset performance and safety but the relationship between combined measures of operational asset condition and safety performance has not been explored This project investigates the effect of pavement marking retroreflectivity and pavement condition on safety in a multi objective manner Data on one mile segments for all Iowa primary roads

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1284753788 (2015-11-09)
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  • Lane Departure Safety Countermeasures: Strategic Action Plan for the Iowa Department of Transportation
    Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Lane Departure Safety Countermeasures Strategic Action Plan for the Iowa Department of Transportation Continuous milled in centerline rumble strips and edge line rumble stripes in Iowa Roche 2011 Researcher s Principal investigators Shashi Nambisan Co principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Project status Completed Start date 03 01 09 End date 03 31 11 Publications Report Lane Departure Safety Countermeasures Strategic Action Plan for the Iowa Department of Transportation 31 30 mb pdf June 2011 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Lane departure crashes are the single largest category of fatal and major injury crashes in Iowa The Iowa Department of Transportation DOT estimates that 60 percent of roadway related fatal crashes are lane departures and that 39 percent of Iowa s fatal crashes are single vehicle run off road SVROR crashes Addressing roadway departure was identified as one of the top eight program strategies for the Iowa DOT in their Comprehensive Highway Safety Plan CHSP The goal is to reduce lane departure

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-798466006 (2015-11-09)
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  • Low-Cost Strategies to Reduce Speed and Crashes on Curves
    Loop Drive Suite 4700 Ames IA 50010 8664 Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Low Cost Strategies to Reduce Speed and Crashes on Curves Supplementary retroreflective material on chevron posts were one treatment evaluated Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Co principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Neal Hawkins 515 294 7733 hawkins iastate edu Student researcher Huishan Duan Project status Completed Start date 11 01 08 End date 03 31 11 Publications Reports Evaluation of Low Cost Treatments on Rural Two Lane Curves 2 52 mb pdf August 2012 MnDOT Toolbox of Countermeasures for Rural Two Lane Curves NA pdf October 2013 Toolbox of Countermeasures for Rural Two Lane Curves 4 00 mb pdf October 2013 Related publications Evaluation of Low Cost Treatments on Rural Two Lane Curves On Pavement Markings 1 59 mb pdf Tech transfer summary Oct 2012 Evaluation of Low Cost Treatments on Rural Two Lane Curves Post Mounted Delineators 1 22 mb pdf Tech transfer summary Oct 2012 Sponsor s partner s Sponsor

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1352703394 (2015-11-09)
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  • Development of Performance Properties of Ternary Mixtures: Laboratory Study on Concrete
    8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Development of Performance Properties of Ternary Mixtures Laboratory Study on Concrete Concrete slice Researcher s Principal investigators Peter Taylor 515 294 9333 ptaylor iastate edu Co principal investigator Paul Tikalsky The University of Utah Project status Completed Start date 03 06 08 End date 02 28 11 Publications Report Development of Performance Properties of Ternary Mixtures Laboratory Study on Concrete 4 54 mb pdf October 2012 Tech transfer summary Development of Performance Properties of Ternary Mixtures Laboratory Study on Concrete 613 kb pdf Mar 2011 Sponsor s partner s Sponsor s Federal Highway Administration TPF 5 117 About the research Abstract This research project is a comprehensive study of how supplementary cementitious materials SCMs can be used to improve the performance of concrete mixtures This report summarizes the findings of the Laboratory Study on Concrete phase of this work The earlier paste and mortar phase of this work considered several sources of each type of SCM fly ash slag and silica fume so that the material variability issues could be addressed Several different sources of portland cement and blended cement were

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1526309512 (2015-11-09)
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  • Development of Updated Specifications for Roadway Rehabilitation Techniques
    rights reserved Development of Updated Specifications for Roadway Rehabilitation Techniques Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Co principal investigators Paul Wiegand 515 294 7082 pwiegand iastate edu Larry Stevens Project status Completed Start date 11 25 08 End date 02 28 11 Publications Report Development of Updated Specifications for Roadway Rehabilitation Techniques 1 15 mb pdf May 2011 Tech transfer summary Development of Updated

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-984873598 (2015-11-09)
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  • The Actual Cost of Food Systems on Roadway Infrastructure
    research CTRE is an Iowa State University center administered by the Institute for Transportation Address 2711 S Loop Drive Suite 4700 Ames IA 50010 8664 Phone 515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved The Actual Cost of Food Systems on Roadway Infrastructure Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Project status Completed Start date 08 08 09 End date 02 28 11 Publications Report The Actual Cost of Food Systems on Roadway Infrastructure 636 19 kb pdf March 2011 Tech transfer summary The Actual Cost of Food Systems on Roadway Infrastructure 151 95 kb pdf Mar 2011 Sponsor s partner s Sponsor s Leopold Center for Sustainable Agriculture About the research Abstract The impact on the transportation infrastructure is very much dependent on the type of vehicle used to move goods While heavier vehicles are employed on cross country distances for local and regional mid to light trucks are used to move shorter distances The project found strong reasons why Iowa should invest more in the local food system as it has the least impact on roadway infrastructure

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1021684724 (2015-11-09)
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  • Evaluation of Safety Edge Benefits in Iowa
    to control their vehicle when inadvertently leaving the paved driving area In addition scrubbing between the pavement edge and tire can result in loss of control The Federal Highway Administration FHWA 2010 estimates that 160 fatalities and more than 11 000 injuries annually are related to unsafe pavement edges The FHWA developed the Safety Edge based on results of research indicating that a sloped pavement edge surface could more easily be traversed by the driver of a vehicle leaving its lane and attempting to remount the pavement edge The Safety Edge is a design feature that creates about a 30 degree fillet along the outermost edge of the paved section of the roadway The Safety Edge is most commonly placed during hot mix asphalt HMA paving using a device that shapes and consolidates the asphalt material at the pavement edge into about a 30 degree fillet The shape created by the Safety Edge reduces the likelihood that tire scrubbing will occur and provides a gradual rather than an abrupt transition back to the roadway as drivers of errant vehicles remount the pavement surface Because use of the Safety Edge was relatively new to Iowa the Iowa Department of Transportation DOT and the FHWA Iowa Division commissioned the Center for Transportation Research and Education CTRE at Iowa State University ISU to develop educational materials market the Safety Edge to Iowa counties and conduct some early analyses of the Safety Edge One of the project objectives was to encourage use of the Safety Edge by marketing it to state and local agencies in Iowa With input from the advisory group a list of potential projects where the Safety Edge could be applied was developed A survey of counties identified planned projects for the 2010 construction season These counties were then contacted to determine interest in using the Safety Edge concept Participating Iowa counties added the Safety Edge to projects by contract plans or extra work orders depending on project letting dates When requested the CTRE team provided various types of technical assistance including project design recommendations attendance at pre construction meetings open houses to demonstrate the Safety Edge loan of equipment for actual roadway construction with the Safety Edge troubleshooting and monitoring of work The CTRE research team also provided technical assistance as needed to agencies where the Safety Edge was used The project resulted in a final report and three deliverables which can be used nationally by state county and local roadway agencies 1 Training Material for Local Technical Assistance Programs LTAP The CTRE team worked with a number of counties during the 2010 construction season to educate agencies and contractors and provide technical assistance before and during construction The team developed materials to educate counties and contractors who had not used the Safety Edge before Additionally during the season the team worked with agencies to resolve a number of problems that occurred during construction Discussions with other state DOT and agencies indicated that they had also experienced similar problems but

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=947242180 (2015-11-09)
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  • Identification and Evaluation of Pavement - Bridge Interface Ride Quality Improvement and Corrective Strategies
    DCP test in backfill sand Plate load test to determine in situ collapse potential MSE wall abutment Subsurface approach void Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Co principal investigators Jake Bigelow David White 515 294 1463 djwhite iastate edu Student researchers Jiake Zhang Mark Berns Project status Completed Start date 08 07 08 End date 01 31 11 Publications Report Final Report Identification and Evaluation of Pavement Bridge Interface Ride Quality Improvement and Corrective Strategies 29 21 mb pdf January 2011 Tech transfer summary Tech Transfer Summary Identification and Evaluation of Pavement Bridge Interface Ride Quality Improvement and Corrective Strategies 297 15 kb pdf Jan 2011 Sponsor s partner s Sponsor s Ohio Department of Transportation About the research Abstract Bridge owners have long recognized that the approach pavement at bridges is prone to exhibiting both settlement and cracking which manifest as the bump at the end of the bridge This deterioration requires considerable on going maintenance expenditures added risk to maintenance workers increased distraction to drivers reduced steering control increased damage to vehicles a negative public perception of the highway system and a shortened useful bridge life This problem has recently begun to receive significant national attention as bridge owners have increased the priority of dealing with this recurring problem No single factor in and of itself individually leads to significant problems Rather it is an interaction between multiple factors that typically leads to problematic conditions As such solutions to the problem require interdisciplinary thinking and implementation The bridge abutment interface is a highly complex region and an effective bump at the end of the bridge solution must address the structural geotechnical hydraulic and construction engineering disciplines Various design alternatives construction practices and maintenance methods exist to minimize bridge approach

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1594982158 (2015-11-09)
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