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  • Warm Mix Asphalt Phase II: Evaluation of WMA Quality Assurance Testing Protocols
    WMA Quality Assurance Testing Protocols Researcher s Principal investigators Chris Williams 515 294 4419 rwilliam iastate edu Iowa State University Student researcher Ashley Buss Project status Completed Start date 06 07 11 End date 08 31 13 Publications Report Investigation of Warm Mix Asphalt for Iowa Roadways Phase II 7 34 mb pdf November 2013 Tech transfer summary Investigation of Warm Mix Asphalt for Iowa Roadways Phase II 807 45 kb pdf Sep 2013 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Phase II of this study further evaluated the performance of plant produced warm mix asphalt WMA mixes by conducting additional mixture performance tests at a broader range of temperatures adding additional pavements to the study comparing virgin and recovered binder properties performing pavement condition surveys and comparing survey data with the Mechanistic Empirical Pavement Design Guide MEPDG forecast for pavement damage over 20 years of service life Further objectives detailing curing behavior quality assurance testing and hybrid technologies were as follows Compare the predicted and observed field performance of existing WMA trials produced in the previous Phase I study to that of hot mix asphalt HMA control sections to determine if Phase I conclusions are translating to the field Identify any curing effect and timing of the effect of WMA mixtures and binders in the field Determine how the field compacted mixture properties and recovered binder properties of WMA compare to those of HMA over time for technologies common to Iowa Identify the protocols for WMA sample preparation for volumetric and performance testing that best simulate field conditions To comprehensively study WMA materials multiple WMA technologies were included for a variety of asphalt mixtures that were monitored by a yearly pavement conditioning survey Eleven field produced mixes were

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-529140120 (2015-11-09)
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  • A Guidebook for Construction Manager-at-Risk Contracting for Highway Projects
    Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved A Guidebook for Construction Manager at Risk Contracting for Highway Projects Researcher s Principal investigators Doug Gransberg 515 294 2140 dgran iastate edu Co principal investigators Jennifer Shane 515 294 1703 jsshane iastate edu Project status Completed Start date 03 08 11 End date 07 31 13 Publications Report A Guidebook for Construction Manager at Risk Contracting for Highway Projects NA pdf June 2013 Sponsor s partner s Sponsor s National Cooperative Highway Research Program NCHRP About the research Abstract Construction Manager General Contractor CMGC project delivery is an integrated team approach to the planning design and construction of a highway project to control schedule and budget and to 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 The aim of this project delivery method is to engage at risk construction expertise early in the design process to enhance constructability manage risk and facilitate concurrent execution of design and construction without the owner giving up control over the details of design as it would in a design build

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-671936815 (2015-11-09)
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  • Improving Traffic Safety Culture in Iowa - Phase II
    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 Traffic Safety Culture in Iowa Phase II Researcher s Principal investigators Konstantina Gkritza Co principal investigator Chris Albrecht Student researcher Wanjun Li Project status Completed Start date 05 19 11 End date 07 31 13 Publications Report Improving Traffic Safety Culture in Iowa Phase II 706 11 kb pdf August 2013 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Phase II of Improving Traffic Safety Culture in Iowa focuses on producing actions that will improve the traffic safety culture across the state and involves collaboration among the three large public universities in Iowa Iowa State University University of Northern Iowa and University of Iowa More specifically this second phase synthesizes the expert opinions solicited in Phase I with prevailing public views and or opinions gathered from a follow up survey on Iowa s 2000 public opinion survey which the University of Northern Iowa

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1111823762 (2015-11-09)
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  • Moisture Sensor Investigation for Historic Covered Bridges
    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 Moisture Sensor Investigation for Historic Covered Bridges Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Project status Completed Start date 07 09 10

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-515217571 (2015-11-09)
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  • Performance of Recycled Asphalt Shingles in Hot Mix Asphalt
    2013 Illinois DOT s Project Involvement 349 03 kb pdf Tech transfer summary Sep 2013 Indiana DOT s Project Involvement 326 73 kb pdf Tech transfer summary Sep 2013 Iowa DOT s Project Involvement 322 33 kb pdf Tech transfer summary Sep 2013 Minnesota DOT s Project Involvement 342 59 kb pdf Tech transfer summary Sep 2013 Missouri DOT s Project Involvement 347 08 kb pdf Tech transfer summary Sep 2013 Wisconsin DOT s Project Involvement 337 71 kb pdf Tech transfer summary Sep 2013 Performance of Recycled Asphalt Shingles in Hot Mix Asphalt 440 93 kb pdf Tech transfer summary Sep 2013 Sponsor s partner s Sponsor s California Department of Transportation Colorado Department of Transportation Federal Highway Administration Transportation Pooled Fund Illinois Department of Transportation Indiana Department of Transportation Iowa Department of Transportation Minnesota Department of Transportation Missouri Department of Transportation Wisconsin Department of Transportation About the research Abstract State highway agencies are increasingly intersted in using recycled asphalt shingles RAS in hot mix asphalt HMA applications yet many agencies share common questions about the effect of RAS on the performance of HMA Previous research has allowed for only limited laboratory testing and field surveys The complexity of RAS materials and lack of past experiences led to the creation of Transportation Pooled Fund TPF Program TPF 5 213 The primary goal of this study is to address research needs of state DOT and environmental officials to determine the best practices for the use of recycled asphalt shingles in hot mix asphalt applications Agencies participating in the study include Missouri lead state California Colorado Illinois Indiana Iowa Minnesota Wisconsin and the Federal Highway Administration The agencies conducted demonstration projects that focused on evaluating different aspects factors of RAS that include RAS grind size RAS percentage RAS source post consumer

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1715105792 (2015-11-09)
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  • Work-Zone Traffic Performance Measures
    0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Work Zone Traffic Performance Measures Researcher s Principal investigators Shauna Hallmark 515 294 5249 shallmar iastate edu Iowa State University Project status Completed Start date 07 15 12 End date 06 30 13 Publications Report Synthesis of Work Zone Performance Measures 2 44 mb pdf September 2013 Tech transfer summary Work Zone Traffic Performance Measures

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1304327238 (2015-11-09)
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  • De-Icing Agent Performance Evaluation
    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 De Icing Agent Performance Evaluation Researcher s Principal investigators Fatih Bektas 515 294 5857 fbektas iastate edu Peter Taylor 515 294 9333 ptaylor iastate edu Project status Completed Start date 09 01 12 End date 05 31 13 Publications Report De Icing Agent Performance Evaluation 1 00 mb pdf May 2013 Sponsor s partner s Sponsor s Iowa Center for Industrial Research and Service CIRAS Iowa State University Extension and Outreach About the research Abstract The presence of snow and ice during winter in northern states including Iowa leads to many problems related to public safety and transportation efficiency Therefore selecting a deicing product to solve these problems is important There is a continuous search for the ideal product that is effective against ice and not harmful to pavement and environment at the same time A laboratory program was carried out to investigate the effects

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=2092657899 (2015-11-09)
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  • Design of UHPC Waffle Deck Panel System for Broader Bridge Applications
    0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Design of UHPC Waffle Deck Panel System for Broader Bridge Applications Researcher s Principal investigators Sri Sritharan 515 294 5238 sri iastate edu Iowa State University Co principal investigators Sriram Aaleti Terry Wipf 515 294 6979 tjwipf iastate edu Project status Completed Start date 11 01 11 End date 05 31 13 Publications Report Design Guide for Precast UHPC Waffle Deck Panel System including Connections 6 69 mb pdf June 2013 Related publication Designing a Better Bridge with Ultra High Performance Concrete Jun 2013 Sponsor s partner s Sponsor s FHWA Highways for LIFE HfL About the research Abstract As a part of an innovation project funded by the Federal Highway Administration FHWA Highways for LIFE program a full depth precast ultra high performance concrete UHPC waffle deck panel and appropriate connections suitable for field implementation of waffle decks were developed Following a successful full scale validation test on a unit consisting of two panels and there different types of connections under laboratory conditions the waffle deck was successfully installed on a replacement bridge in Wapello County Iowa The subsequent load testing confirmed the desirable

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1813499468 (2015-11-09)
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