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  • Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures - Phase 3
    mix can cause asphalt mixtures to stiffen due to the hardening effect of the aged binder in RAP materials During the aging process of asphalt binders the amount of maltenes is decreased and an increase in volume of asphaltenes as maltenes change to asphaltenes Thus there will be less maltenes to disperse asphaltenes throughout the aged binder structure As a result the aged binder would become harder and more viscous but less ductile which could negatively affect the performance of the high RAP mixes in the field A low temperature cracking potential is a primary concern with high RAP mixtures To minimize a low temperature cracking various rejuvenators have been utilized in the past instead of bumping down a PG grade of the specified virgin asphalt for high RAP mixes However in some cases the premature failures such as rutting have been observed from the high RAP mixtures with rejuvenators Rejuvenators can be made from lubricating oil extract or extender oil which would be a great source of maltenes However rejuvenators may have certain amounts of saturates which may not be compatible with the asphaltenes in the aged binder Therefore two most critical issues associated with adding rejuvenators into the high RAP mixes would be 1 the quality of diffusion of that rejuvenator into the aged binder and 2 the uniformity of rejuvenator dispersion within a high RAP mix and Corbett 1975 Petersen 1984 A diffusion process of a rejuvenator into the aged binder would progress during mixing and construction process but it would stop after a certain period of time The diffusion rate would be influenced by the viscosity of maltenes in the aged binder and it would increase by increasing amounts of diluent oil fractions at higher temperature Oliver 1974 A mechanism of rejuvenators in high RAP mixtures

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-520688946 (2015-11-09)
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  • NCHRP Guidelines for Managing Geotechnical Risks in Design-Build Projects
    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 NCHRP Guidelines for Managing Geotechnical Risks in Design Build Projects Researcher s Principal investigators Doug Gransberg 515 294 2140 dgran iastate edu Project

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1467270340 (2015-11-09)
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  • Owner Operators versus Company Drivers Safety Performance Analysis
    Iowa State University All rights reserved Owner Operators versus Company Drivers Safety Performance Analysis Researcher s Principal investigator David Cantor Iowa State University Project status In progress Start date 06 01 15 End date 12 31 15 Sponsor s partner s Sponsor s Iowa State University Midwest Transportation Center USDOT OST R About the research Abstract The purpose of this study is the development of a proof of concept truck

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1949402476 (2015-11-09)
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  • Temporary Traffic Control Handbook for Local Agencies
    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 Temporary Traffic Control Handbook for Local Agencies Researcher s Principal investigator Paul Wiegand 515 294 7082 pwiegand iastate edu Project status In progress Start date 06 01 15 End date 05 31 16 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract The Work Zone Safety for Iowa handbook was last issued in January 2005 and needs to be reviewed and updated The 2005 Work Zone Safety handbook is based on the 2003 edition of the Manual on Uniform Traffic Control Devices MUTCD The State of Iowa is currently using the 2009 edition as the state standard Statewide Urban Design and Specifications SUDAS staff has taken on the task to update the 2005 Work Zone Safety handbook A committee of city county Iowa Department of Transportation DOT Iowa Local Technical Assistance Program LTAP and utility representatives is providing feedback on revisions to update the handbook However the SUDAS

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-189151427 (2015-11-09)
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  • Investigation of Glulam Girder Bridges with Composite Prefabricated Decks
    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 Investigation of Glulam Girder Bridges with Composite

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-2044422439 (2015-11-09)
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  • Machine Vision Based Roadway Health Monitoring and Assessment
    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 Machine Vision Based Roadway Health Monitoring and Assessment Researcher s Principal investigators Kasthurira Gopalakrishnan 515 294 3044 rangan iastate edu Iowa State University Co principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Halil Ceylan 515 294 8051 hceylan iastate edu Iowa State University Koray Celik koray iastate edu Iowa State University Arun Somani arun iastate edu Iowa State University Project status In progress Start date 05 15 15 End date 11 16 15 Sponsor s partner s Sponsor s Iowa State University Midwest Transportation Center USDOT OST R About the research Abstract There is a critical need to advance the state of the art and innovate to provide enabling technologies that can continuously monitor and enable health management of our transportation infrastructure systems This research project aims to design an automated consistent and cost effective condition monitoring device for the highway system based on state of the art machine vision techniques This objective will be achieved by developing

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=72765752 (2015-11-09)
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  • Evaluation of Fueling Our Future
    Iowa State University Project status In progress Start date 05 01 15 End date 08 31 16 Sponsor s partner s Sponsor s Iowa Department of Agriculture and Land Stewardship Iowa Department of Transportation About the research Abstract In an effort gain a greater understanding of the impacts of alternative blends of ethanol based fuels E30 in particular the Iowa Department of Agriculture and Land Stewardship IDALS and the Iowa Department of Transportation DOT have initiated a pilot project that builds upon IDALS existing Renewable Fuels Infrastructure Program This pilot project would provide funding as an incentive to private sector installation of renewable fueling pumps likely blender pumps however this will also include a research and analysis component to assess the impacts of installation of these pumps on consumer behavior and emissions The Fueling our Future pilot program is administered by the Iowa Renewable Fuel Infrastructure Program RFIP of the Iowa Department of Agriculture and Land Stewardship IDALS and the Iowa Department of Transportation IDOT This program seeks to gain better consumer information about their fueling preferences focus on marketing opportunities that will increase the use of higher blends of ethanol and biodiesel and provide a pathway to reduce particulate matter PM 2 5 or less in Iowa The project will utilize grant incentives to encourage interest and participation for specific infrastructure upgrades and data sharing The data sharing is expected to involve sharing of fuel sales over a specified time period and limited access to customers and employees to gather information and data The extent of this data sharing will be mutually agreed upon by all parties Two sites were selected 1 The Farmer s Cooperative station in Mount Ayr will offer ElO E15 and E30 ESO and E85 and BS B 10 and B20 Mount Ayr is in

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1273549754 (2015-11-09)
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  • Test Methods for LRFD Resistance Factors of Drilled Shafts
    294 5238 sri iastate edu Iowa State University Project status In progress Start date 05 01 15 End date 04 30 16 Sponsor s partner s Sponsor s Iowa Department of Transportation Midwest Transportation Center USDOT OST R About the research Abstract In recent years the Iowa Department of Transportation DOT as well as several other state DOTs have made increasing use of drilled shaft foundations on bridge projects Due to soil variability and the lack of redundancy the Iowa DOT typically requires that a bi directional Osterberg cell O cell load test be performed on a demonstration shaft at each new bridge project The load test results are then used to verify the predicted capacity and often to adjust the values of geotechnical shaft resistances used in designing the shafts for the entire bridge However O cell tests are very costly around 100k per test and often provide inconclusive results as only the upper or lower portion of the shaft or neither actually reach failure As a result extrapolation is commonly necessary to estimate the expected load displacement behavior of the bridge foundations under the actual top down loading conditions To address these shortcomings this research investigates the use

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1460195081 (2015-11-09)
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