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  • Laboratory and Field Testing of an Accelerated Bridge Construction Demonstration Bridge: US Highway 6 Bridge over Keg Creek
    ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Laboratory and Field Testing of an Accelerated Bridge Construction Demonstration Bridge US Highway 6 Bridge over Keg Creek Moment resisting transverse UHPC joints at pier locations was a first for the US on this bridge Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Co principal investigators Matt Rouse 515 201 6686 jmr19 iastate edu Terry Wipf 515 294 6979 tjwipf iastate edu Project status Completed Start date 07 05 11 End date 04 08 13 Publications Report Laboratory and Field Testing of an Accelerated Bridge Construction Demonstration Bridge US Highway 6 Bridge over Keg Creek 5 26 mb pdf April 2013 Tech transfer summary Laboratory and Field Testing of an Accelerated Bridge Construction Demonstration Bridge US Highway 6 Bridge over Keg Creek 176 96 kb pdf Apr 2013 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation About the research Abstract The US Highway 6 Bridge over Keg Creek outside of Council Bluffs Iowa is a demonstration bridge site chosen to put into practice newly developed Accelerated Bridge Construction ABC concepts One

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1843325604 (2015-11-09)
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  • Measuring Salt Retention
    principal investigator Research by sponsor Research by keyword Project pages maintained by PI Search 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 Measuring Salt Retention Salt sample collection per run and grid square Close up of zero velocity spreader from high speed video capture Researcher s Principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Co principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Basak Aldemir Bektas 515 294 4033 basak iastate edu Project status Completed Start date 09 15 12 End date 03 31 13 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation About the research Abstract This research developed and completed a field evaluation of salt distribution equipment The evaluation provides a direct comparison of three different types of salt spreaders at three different truck speeds and rates of pre wetting A rubber mat was divided into eight sample areas to measure the

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1532150439 (2015-11-09)
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  • Compaction "Roadeo" Field Demonstration: Roller-Integrated Compaction Monitoring and Subgrade Geosynthetic Reinforcement
    09 25 07 End date 12 31 12 Publications Report Compaction Roadeo Field Demonstration Roller Integrated Compaction Monitoring and Subgrade Geosynthetic Reinforcement 10 68 mb pdf December 2012 Sponsor s partner s Sponsor s Second Strategic Highway Research Program SHRP 2 About the research Abstract This field demonstration project which was part of the SHRP 2 R02 project Geotechnical Solutions for Soil Improvement Rapid Embankment Construction and Stabilization of the Pavement Working Platform was conducted on the SR9B construction project in Jacksonville Florida from May 16 to May 19 2011 A Caterpillar CS74 vibratory smooth drum self propelled roller weighing about 34 000 pounds was used on the project The machine was setup with a roller integrated compaction monitoring RICM system Four test beds TBs were constructed and tested using the on site poorly graded sand embankment fill A 3 according to the AASHTO classification system TB1 involved constructing six test sections incorporating several different geosynthetic reinforcement materials biaxial geogrid BX geogrid nonwoven geotextile geocomposite C30 polypropylene woven fabric PPWF and 100 mm or 150 mm geocell GC materials and one control section TB2 involved compacting a thick loose lift about 1 2 m deep in two sections one with

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-159867489 (2015-11-09)
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  • Evaluating the Effectiveness of the City of Des Moines LED and RRFB Pedestrian Crossing Treatments
    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 Evaluating the Effectiveness of the City of Des Moines LED and RRFB Pedestrian Crossing Treatments Two supplementary pedestrian activated sign treatments were evaluated Researcher s Principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Co principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Project status Completed Start date 10 22 10 End date 12 31 12 Publications Report Evaluating the Effectiveness of the City of Des Moines LED and RRFB Pedestrian Crossing Treatments 1 63 mb pdf January 2013 Tech transfer summary Evaluating the Effectiveness of the City of Des Moines LED and RRFB Pedestrian Crossing Treatments 1 17 mb pdf Dec 2012 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract This project provides the City of Des Moines Iowa with field information relative to pedestrian and motorist compliance when light emitting diode LED pedestrian crossing signs or rectangular rapid flash beacons RRFBs are used at

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=867134283 (2015-11-09)
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  • Evaluation of Dynamic Speed Feedback Signs on Curves: A National Demonstration Project
    speed feedback sign on curve 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 Project status Completed Start date 09 04 07 End date 12 31 12 Publications Report Evaluation of Dynamic Speed Feedback Signs on Curves A National Demonstration Project NA pdf November 2015 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board Midwest Transportation Consortium Texas Department of Transportation U S Department of Transportation About the research Abstract Lane departure crashes are a significant safety concern The majority of lane departure crashes occur on rural two lane roadways with a disproportionate number of these crashes on horizontal curves Curve related crashes involve a number of roadway and driver causative factors A primary driver factor is speeding Dynamic speed feedback sign DSFS systems are one method to reduce vehicle speeds and consequently crashes on curves These systems show promise but they have not been fully evaluated on curves The Center for Transportation Research and Education at Iowa State University conducted a national demonstration project to evaluate the effectiveness of two different DSFSs in reducing speed and crashes on curves at 22 total sites on rural two lane roadways in seven States The goal is to provide traffic safety engineers and other professionals with additional tools to manage speeds and crashes on rural horizontal curves more effectively Data were collected before and at 1 12 and 24 months after installation of the DSFS On average most sites had decreases in mean speeds with decreases up to 10 9 miles per hour mph noted for both the point of curvature PC and center of curve CC Most sites

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1246486313 (2015-11-09)
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  • Evaluation of the Safety Edge in Iowa: Phase II
    5249 shallmar iastate edu Iowa State University Co principal investigators Robert Sperry Tom McDonald Project status Completed Start date 07 07 11 End date 12 31 12 Publications Report Evaluation of the Safety Edge in Iowa Phase II 4 13 mb pdf December 2012 Tech transfer summary Recommendations for Achieving Safety Edge Consistency during Paving 2 14 mb pdf Dec 2012 Sponsor s partner s Sponsor s Federal Highway Adminisitration Accelerating Safety Activities Program Iowa Department of Transportation About the research Abstract Roadway departure crashes are a serious traffic safety concern These crashes account for about 53 percent of US highway fatalities and one million injuries annually The Iowa Department of Transportation DOT estimates approximately 52 percent of roadway related fatal crashes in Iowa are lane departures The Federal Highway Administration FHWA estimated in 2010 that 160 fatalities and more than 11 000 injuries related to unsafe pavement edges occur annually The Safety Edge is a design feature that creates a 30 degree fillet along the outside edge of a roadway during paving operations The FHWA developed the Safety Edge based on research that indicated a sloped pavement edge surface could be traversed more easily by vehicles attempting to remount

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1421519206 (2015-11-09)
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  • Field Evaluation of Methods to Minimize Transverse Glulam Deck Deflection Phase III
    title Research by principal investigator Research by sponsor Research by keyword Project pages maintained by PI Search 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 Field Evaluation of Methods to Minimize Transverse Glulam Deck Deflection Phase III Researcher s Principal investigators Terry Wipf 515 294 6979 tjwipf iastate edu Co principal investigators Travis Hosteng 515 294 7197 kickhos iastate edu Brent Phares 515 294 5879 bphares iastate edu Iowa State University Project status Completed Start date 08 15 07 End date 12 31 12 Publications Report All Materials for Glulam on National Center for Wood Transportation Structures website NA pdf May 2015 Sponsor s partner s Sponsor s USDA Forest Products Laboratory About the research Abstract The objective of the second phase of this project was to conduct full scale field evaluations of various methods identified in previous research related to differential panel deflection and wearing surface distress in transverse glulam deck panels supported by longitudinal glulam stringers The purpose of

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=877844592 (2015-11-09)
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  • Implementation of Concrete Pavement Preservation and PCC Surface Characteristics: Tire Pavement Noise Program
    rights reserved Implementation of Concrete Pavement Preservation and PCC Surface Characteristics Tire Pavement Noise Program Researcher s Principal investigator Paul Wiegand 515 294 7082 pwiegand iastate edu Co principal investigators Dale Harrington Snyder Tom Cackler Theodore Ferragut Project status Completed Start date 01 29 07 End date 12 31 12 Publications Reports Concrete Pavement Surface Characteristics Key Findings and Guide Specifications 1 59 mb pdf August 2012 How to Reduce

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1317576198 (2015-11-09)
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