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  • Effectiveness of Paved Shoulders in Iowa
    Publications Reports Safety Benefits of Paved Shoulders 1 69 mb pdf November 2009 Safety Benefits of Paved Shoulders in Iowa 2 69 mb pdf August 2010 Tech transfer summary Safety Benefits of Paved Shoulders 1 42 mb pdf Nov 2009 Sponsor s partner s Sponsor s Iowa Department of Transportation Midwest Transportation Center About the research Abstract Single vehicle run off road SVROR crashes are the largest type of fatal passenger vehicle crash in the US NCHRP 500 2003 In Iowa ROR crashes accounted for 36 of rural crashes and 9 of total crashes in 2006 Run off road crashes accounted for more than 61 8 of rural fatal crashes and 32 6 of total fatal crashes in Iowa in 2006 The research described in this report evaluates the effectiveness of paved shoulders Generalized linear models were used to investigate the relationship between crash reduction and implementation of paved shoulders The response variable was quarterly crash frequency Separate models were developed for cross centerline crashes run off road crashes and single vehicle run off road crashes The model for each independent variable considered over dispersion and excess zeroes The best fit model for total crashes per quarter was a zero inflated negative binomial model Model results indicated that the total amount of right shoulder presence of a median speed limit addition of a paved shoulder and years after addition of a paved shoulder were statistically significant The effect of paved shoulder varied over time depending on the years after treatment At 10 years the decrease is total crashes due to paved shoulders was 15 9 A negative binominal model was the best fit model for cross centerline crashes and the model indicated that effect of paved shoulders was not statistically significant ROR crashes were modeledassuming the distribution of the response

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=832537926 (2015-11-09)
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  • Development of a Device for Analysis of Portland Cement Concrete and Composite Pavements: Phase 1 Feasibility Study
    rights reserved Development of a Device for Analysis of Portland Cement Concrete and Composite Pavements Phase 1 Feasibility Study Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Co principal investigators Halil Ceylan 515 294 8051 hceylan iastate edu Iowa State University Reginald Souleyrette Project status Completed Start date 11 01 06 End date 10 31 07 Sponsor s partner s Sponsor s Iowa

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1173987080 (2015-11-09)
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  • Embankment Quality, Phase 4: Application to Unsuitable Soils (TR-492)
    compressive strength testing Compaction of unsuitable soils in embankments Fairfield IA Summer 2006 CPT and SPT testing and sampling using drill rigs Fairfield IA November 2006 Similar related projects Embankment Quality Phase 3 TR 401 Embankment Quality Phase 2 TR 401 Embankment Quality Phase 1 TR 401 Researcher s Principal investigators David White 515 294 1463 djwhite iastate edu Co principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Student researchers Joels Malama Brett Larsen Project status Completed Start date 05 15 03 End date 10 31 07 Publications Report Final Report Embankment Quality Phase 4 Application to Unsuitable Soils TR 492 6 5 mb pdf October 2007 Related publications MCT 2007 Paper Embankment construction QC QA using DCP and moisture control Iowa case history for unsuitable soils off site Oct 2011 TRB 2008 Paper Evaluation of dynamic cone penetration quality for cohesive soil embankment construction pilot project for new specification for quality control and quality assurance off site Oct 2011 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract The Quality Management Earthwork QM E special provision was implemented on a pilot project to evaluate quality control QC and quality assurance QA testing in predominately unsuitable soils Control limits implemented on this pilot project included the following 95 relative compaction moisture content not exceeding 2 of optimum moisture content soil strength not exceeding a dynamic cone penetrometer DCP index of 70 mm blow vertical uniformity not exceeding a variation in DCP index of 40 mm blow and lift thickness not exceeding depth determined through construction of control strips Four point moving averages were used to allow for some variability in the measured parameter values Management of the QC QA data proved to be one of the most challenging aspects of the pilot project

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=587 (2015-11-09)
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  • Field Evaluation of Timber Preservation Treatments for Iowa Highway Applications (IHRB-05-10)
    Copyright 1996 2009 Iowa State University All rights reserved Field Evaluation of Timber Preservation Treatments for Iowa Highway Applications IHRB 05 10 Poor exterior stringer with creosote bleeding and severe split Researcher s Principal investigators Terry Wipf 515 294 6979 tjwipf iastate edu Co principal investigators Wayne Klaiber 515 294 8763 klaiber iastate edu Michael LaViolette Carol Clausen USDA Forest Service Forest Products Laboratory Stan Lebow USDA Forest Service Forest Products Laboratory Project status Completed Start date 04 01 06 End date 10 31 07 Publications Report Field Evaluation of Timber Preservation Treatments for Iowa Highway Applications IHRB 05 10 2 mb pdf December 2007 Tech transfer summary Timber Preservation Treatments for Highway Applications 394 k pdf Oct 2007 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract Timber material repair and replacement cost for timber bridges is a considerable expense to highway agencies in Iowa especially to county road departments To address these needs the objectives of this investigation was to study the field effectiveness of various treatment alternatives used on Iowa roadway projects and to determine if the current specifications and testing are adequate for providing proper wood preservation To satisfy the research

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-727723858 (2015-11-09)
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  • Improving Transportation for Large Scale Events Within the State of Iowa
    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 Improving Transportation for Large Scale Events Within the State of Iowa Iowa State Fairgrounds parking Iowa State Fair traffic control staff Iowa State Fair dynamic message sign for shuttle Iowa State Fair portable dynamic message sign for shuttle Researcher s Principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Student researcher Hillary Isebrands Project status Completed Start date 11 01 06 End date 10 31 07 Publications Reports Iowa State Fair Special Events Management Strategic Plan 1 98 mb pdf April 2010 Iowa State University Football Special Events Management Strategic Plan 3 37 mb pdf April 2010 Special Events Strategic Planning 221 02 kb pdf April 2010 University of Iowa Football Special Events Management Strategic Plan 1 64 mb pdf April 2010 Sponsor s partner s Sponsor s Iowa Department of Transportation Partner s ITERIS About the research Abstract The development

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-350831498 (2015-11-09)
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  • Investigation of Steel Stringer Bridges: Superstructures and Substructures, Vol II (TR-522)
    Substructure and Superstructure Volume II 12 8 mb pdf October 2007 Final Report Investigation of Steel Stringer Bridges Superstructures and Substructures Volume I 4 2 mb pdf October 2007 Related publications MCT 2007 Paper Determination of load ratings for non composite steel girder bridges off site Oct 2011 Tech Transfer Summary Investigation of Steel Stringer Bridges 750 kb pdf Tech transfer summary Oct 2007 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract There are hundreds of structurally deficient or functionally obsolete bridges in the state of Iowa With the majority of these bridges located on rural county roads where there is limited funding available to replace the bridges diagnostic load testing can be utilized to determine the actual load carrying capacity of the bridge One particular family or fleet of bridges that has been determined to be desirable for load testing consists of single span bridges with non composite cast in place concrete decks steel stringers and timber substructures Six bridges with poor performing superstructure and substructure from the aforementioned family of bridges were selected to be load tested The six bridges were located on rural roads in five different counties in Iowa Boone Carroll Humboldt Mahaska and Marshall Volume I of this report presents diagnostic load tests on the superstructure of the six bridges The results of the diagnostic load tests were used to calibrate analytical models of the bridges for rating purposes All of the bridges were independently rated by three rating agencies using a codified approach Those ratings were then compared to ratings calculated using a bridge model calibrated to the actual response of the bridge due to the load test The calibrated bridge model was then used to rate the bridges and determine whether an increase in the initial codified

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=99017351 (2015-11-09)
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  • Modern Roundabout Guidance for the Iowa DOT
    www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Modern Roundabout Guidance for the Iowa DOT Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Student researcher Hillary Isebrands Project status Completed Start date 04 01 06 End date 09 30 07 Publications Related publication Planning Level Guidelines for Modern Roundabouts 3 8 mb pdf Nov 2008 Sponsor s partner

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1155222883 (2015-11-09)
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  • Administrative Support Group for Concrete Pavement (CP) Road Map
    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 Administrative Support Group for Concrete Pavement CP Road Map Researcher s Principal investigators Tom Cackler Project status Completed Start date 09 11 06 End date

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1931551033 (2015-11-09)
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