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  • Construction Manager/General Contractor Issue Identification
    Shane 515 294 1703 jsshane iastate edu Co principal investigators Doug Gransberg 515 294 2140 dgran iastate edu Project status Completed Start date 05 31 11 End date 08 31 12 Publications Report Construction Manager General Contractor Issue Identification NA pdf August 2012 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract The construction manager at risk CMR project delivery method also termed construction manager general contractor CM GC project delivery in several states enabling legislation is an integrated team approach to the planning design and construction of a project to control schedule and budget and assure quality for the project owner The team consists of the owner the designer which might be an in house engineer and the at risk construction manager Working toward a process to use the CM GC project delivery method the Minnesota Department of Transportation MnDOT identified industry stakeholders to engage and address concerns and work through ideas about CM GC The researchers reviewed the related literature analyzed the content of 30 Request for Proposal Request for Qualifications RFP RFQ solicitation documents and collected compiled responses to a questionnaire structured to answer MnDOT questions that was sent to agencies in

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1809206913 (2015-11-09)
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  • Development of a Bridge Safety Information System for the Saylorville Reservoir Bridge
    Copyright 1996 2009 Iowa State University All rights reserved Development of a Bridge Safety Information System for the Saylorville Reservoir Bridge The Saylorville Reservoir Bridge has five sections with five spans per section Researcher s Principal investigators Travis Hosteng 515 294 7197 kickhos iastate edu Project status Completed Start date 01 01 11 End date 08 31 12 Publications Report Development of a Bridge Safety Information System for the Saylorville

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1715855970 (2015-11-09)
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  • Improving the Accuracy and Usability of Iowa Falling Weight Deflectometer Data
    Iowa State University Co principal investigators Kasthurira Gopalakrishnan 515 294 3044 rangan iastate edu Iowa State University Sunghwan Kim sunghwan iastate edu Project status Completed Start date 08 31 11 End date 08 31 12 Publications Report Improving the Accuracy and Usability of Iowa Falling Weight Deflectometer Data 2 84 mb pdf May 2013 Tech transfer summary Improving the Accuracy and Usability of Iowa Falling Weight Deflectometer Data 690 30 kb pdf Jul 2013 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation About the research Abstract This study aims to improve the accuracy and usability of Iowa Falling Weight Deflectometer FWD data by incorporating significant enhancements into the fully automated software system for rapid processing of the FWD data These enhancements include 1 refined prediction of backcalculated pavement layer modulus through deflection basin matching optimization 2 temperature correction of backcalculated Hot Mix Asphalt HMA layer modulus 3 computation of 1993 AASHTO design guide related effective SN SN eff and effective k value k eff 4 computation of Iowa DOT asphalt concrete AC overlay design related Structural Rating SR and k value k and 5 enhancement of user friendliness of input

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1631390013 (2015-11-09)
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  • Investigation of Low Temperature Cracking in Asphalt Pavements
    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 Investigation of Low Temperature Cracking in Asphalt Pavements Researcher s Principal investigators Chris Williams 515 294 4419 rwilliam iastate edu Iowa State University Project status Completed Start date 06 17 08 End date 08 31 12 Publications Report Investigation of Low

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1616023225 (2015-11-09)
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  • Iowa Calibration of MEPDG Performance Prediction Models
    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 Iowa Calibration of MEPDG Performance Prediction Models Researcher s Principal investigators Halil Ceylan 515 294 8051 hceylan iastate edu Iowa State University Co principal investigators Kasthurira Gopalakrishnan 515 294 3044 rangan iastate edu Iowa State University Sunghwan Kim sunghwan iastate edu Project status Completed Start date 05 20 11 End date 08 31 12 Publications Report Iowa Calibration of MEPDG Performance Prediction Models 4 81 mb pdf June 2013 Tech transfer summary Iowa Calibration of MEPDG Performance Prediction Models 777 81 kb pdf Jun 2013 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract This study aims to improve the accuracy of AASHTO Mechanistic Empirical Pavement Design Guide MEPDG pavement performance predictions for Iowa pavement systems through local calibration of MEPDG prediction models A total of 130 representative pavement sites across Iowa were selected The selected pavement sites represent flexible rigid and composite pavement systems throughout Iowa The required MEPDG inputs

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1587328973 (2015-11-09)
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  • Revision to the SUDAS Traffic Signal Standards - Phase 2
    0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Revision to the SUDAS Traffic Signal Standards Phase 2 Researcher s Principal investigators Neal Hawkins 515 294 7733 hawkins iastate edu Co principal investigator Paul Wiegand 515 294 7082 pwiegand iastate edu Project status Completed Start date 03 01 11 End date 08 30 12 Publications Report Revision to the SUDAS Traffic Signal Standards Phase

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=734682827 (2015-11-09)
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  • Deicer Scaling Resistance of Concrete Pavements, Bridge Decks, and Other Structures Containing Slag Cement: Phase 2: Evaluation of Different Laboratory Scaling Test Methods
    Methods Researcher s Principal investigators Peter Taylor 515 294 9333 ptaylor iastate edu Co principal investigator Doug Hooton Project status Completed Start date 06 22 10 End date 07 25 12 Publications Report Deicer Scaling Resistance of Concrete Pavements Bridge Decks and Other Structures Containing Slag Cement Phase 2 Evaluation of Different Laboratory Scaling Test Methods 1 24 mb pdf October 2012 Sponsor s partner s Sponsor s Federal Highway Administration TPF 5 100 About the research Abstract With the use of supplementary cementing materials SCMs in concrete mixtures salt scaling tests such as ASTM C672 have been found to be overly aggressive and do correlate well with field scaling performance The reasons for this are thought to be because at high replacement levels SCM mixtures can take longer to set and to develop their properties neither of these factors is taken into account in the standard laboratory finishing and curing procedures As a result these variables were studied as well as a modified scaling test based on the Quebec BNQ scaling test that had shown promise in other research The experimental research focused on the evaluation of three scaling resistance tests including the ASTM C672 test with normal curing

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1813860571 (2015-11-09)
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  • Development of Performance Properties of Ternary Mixtures: Field Demonstration Projects
    Ternary Mixtures Field Demonstration Projects 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 08 26 09 End date 07 25 12 Publications Report Development of Performance Properties of Ternary Mixtures Field Demonstrations and Project Summary 14 91 mb pdf October 2012 Related publication Development of Performance Properties of Ternary Mixtures and Concrete Pavement Mixture Design and Analysis MDA Effect of Paste Quality on Fresh and Hardened Properties of Ternary Mixtures 1 20 mb pdf Oct 2012 Sponsor s partner s Sponsor s Federal Highway Administration TPF 5 117 About the research Abstract Supplementary cementitious materials SCM have become common parts of modern concrete practice The blending of two or three cementitious materials to optimize durability strength or economics provides owners engineers materials suppliers and contractors with substantial advantages over mixtures containing only portland cement However these advances in concrete technology and engineering have not always been adequately captured in specifications for concrete Users need specific guidance to assist them in defining the performance requirements for a concrete application and the selection of optimal proportions of the cementitious materials needed to produce the

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1265235142 (2015-11-09)
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