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  • Safety and Operational Effectiveness of One-lane Roundabouts at High Speed Highways
    Iowa State University All rights reserved Safety and Operational Effectiveness of One lane Roundabouts at High Speed Highways Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Project status In progress Start date 05 01 05 End date 10 31 06 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract Roundabout construction has taken off in the U S

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=779786850 (2015-11-09)
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  • County Non-FAE Paved Road Condition: Data Collection, Summary, and Delivery, Phase II
    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 County Non FAE Paved Road Condition Data Collection Summary and Delivery Phase II Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Project status In progress Start

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=91156874 (2015-11-09)
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  • Planning, Implementation, and Operation of the Iowa Pavement Management Program
    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 Planning Implementation and Operation of the Iowa Pavement Management Program Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Co principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Project status In

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=2121924698 (2015-11-09)
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  • Sign Management System for Iowa DOT
    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 Sign Management System for Iowa DOT Researcher s Principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Co principal investigators Zachary Hans 515 294 2329 zhans iastate edu Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Project status In

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1111080969 (2015-11-09)
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  • Development of Non-Petroleum-Based Binders for Use in Flexible Pavements - Phase II
    investigators Chris Williams 515 294 4419 rwilliam iastate edu Iowa State University Project status Completed Start date 10 31 12 End date 11 30 15 Publications Report Development of Non Petroleum Based Binders for Use in Flexible Pavements Phase II 2 48 mb pdf October 2015 Tech transfer summary Development of Non Petroleum Based Binders for Use in Flexible Pavements Phase II 801 08 kb pdf Oct 2015 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Bio binders can be utilized as asphalt modifiers extenders and replacements for conventional asphalt in bituminous binders From the rheology results of Phase I of this project it was found that the bio binders tested had good performance similar to conventional asphalt except at low temperatures Phase II of this project addresses this shortcoming and evaluates the Superpave performance of laboratory mixes produced with the enhanced bio binders The main objective of this research was to develop a bio binder capable of replacing conventional asphalt in flexible pavements by incorporating ground tire rubber GTR into bio oil derived from fast pyrolysis of agriculture and forestry residues

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-857837332 (2015-11-09)
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  • Iowa Pavement Asset Management Decision-Making Framework
    edu Copyright 1996 2009 Iowa State University All rights reserved Iowa Pavement Asset Management Decision Making Framework Researcher s Principal investigator Hyung Seok David Jeong 515 294 7271 djeong iastate edu Iowa State University Co principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Doug Gransberg 515 294 2140 dgran iastate edu Project status Completed Start date 01 01 13 End date 11 30 15 Publications Report Iowa Pavement Asset Management Decision Making Framework 1 75 mb pdf October 2015 Related publications Iowa Pavement Asset Management Decision Making Framework 163 46 kb pdf Tech transfer summary Oct 2015 Pavement Treatment Selection Tool PTST for Local Agencies 1 15 mb pdf Tech transfer summary Oct 2015 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Most local agencies in Iowa currently make their pavement treatment decisions based on their limited experience due primarily to lack of a systematic decision making framework and a decision aid tool The lack of objective condition assessment data of agency pavements also contributes to this problem This study developed a systematic pavement treatment selection framework for local agencies to assist them in selecting the most appropriate treatment and to help justify their maintenance and rehabilitation decisions The framework is based on an extensive literature review of the various pavement treatment techniques in terms of their technical applicability and limitations meaningful practices of neighboring states and the results of a survey of local agencies The treatment selection framework involves three different steps pavement condition assessment selection of technically feasible treatments using decision trees and selection of the most appropriate treatment considering the return on investment ROI and other non economic factors An Excel based spreadsheet tool that automates the treatment selection framework was also

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1934952583 (2015-11-09)
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  • Comparison of Setting Time Measured Using Ultrasonic Wave Propagation with Saw-Cutting Times on Pavements
    Pavements Researcher s Principal investigators Peter Taylor 515 294 9333 ptaylor iastate edu Co principal investigators Kejin Wang 515 294 2152 kejinw iastate edu Iowa State University Project status Completed Start date 05 01 14 End date 10 31 15 Publications Report Comparison of Setting Time Measured Using Ultrasonic Wave Propagation with Saw Cutting Times on Pavements 0 97 mb pdf October 2015 Tech transfer summary Comparison of Setting Time Measured Using Ultrasonic Wave Propagation with Saw Cutting Times on Pavements 341 87 kb pdf Oct 2015 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract At present there is little fundamental guidance available to assist contractors in choosing when to schedule saw cuts on joints To conduct pavement finishing and sawing activities effectively however contractors need to know when a concrete mixture is going to reach initial set or when the sawing window will open Previous research investigated the use of the ultrasonic pulse velocity UPV method to predict the saw cutting window for early entry sawing The results indicated that the method has the potential to provide effective guidance to contractors as to when to conduct early entry sawing

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1059529941 (2015-11-09)
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  • Quantifying Road Roughness from Terrestrial Laser Scanning
    collection using stationary laser scanner Flat black and white target for laser scan referenrce point used for post processing registration Spherical target for laser scan reference point used for post processing registration Taking images of aggregate road surface for photogrammetry Comparison of spatial difference in elevation between terrestrial laser scanning and photogrammetry clouds for a parking lot after paving Researcher s Principal investigators David White 515 294 1463 djwhite iastate edu Project status Completed Start date 06 15 15 End date 10 31 15 Publications Report Comparison of Roadway Roughness Derived from LIDAR and SFM 3D Point Clouds 6 46 mb pdf November 2015 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract The final report for this project describes a short term study undertaken to investigate the potential for using dense three dimensional 3D point clouds generated from light detection and ranging LIDAR and photogrammetry to assess roadway roughness Spatially continuous roughness maps have potential for the identification of localized roughness features which would be a significant improvement over traditional profiling methods The report specifically illustrates the use of terrestrial laser scanning TLS and photogrammetry using a process known as structure from motion SFM

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1379274748 (2015-11-09)
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