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  • Evaluation of Air-Coupled Impact-Echo Test Method
    Jeramy Ashlock 515 294 6176 jashlock iastate edu Co principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Project status Completed Start date 07 01 13 End date 12 31 14 Publications Report Evaluation of Air Coupled Impact Echo Test Method 10 50 mb pdf May 2015 Sponsor s partner s Sponsor s Mid America Transportation Center U S DOT RITA About the research Abstract The final report presents the results of an experimental and computational study on the recently developed air coupled impact echo IE nondestructive testing NDT method in which microphones replace the traditional physically coupled IE sensors To develop an optimum testing system and verify the new method two concrete plates were tested in the laboratory one of which was a solid concrete slab and the other was a mock up reinforced concrete bridge deck with artificial defects An IE testing system was developed using a custom program written in LabVIEW The accuracy and feasibility of the air coupled test method to determine the solid thickness of concrete structures and to detect defects or flaws such as delaminations or voids were verified by comparing test results obtained via the air coupled and physically coupled sensors When using the air coupled IE method in practice ambient noise generated by wind traffic and machinery will be sensed by the microphones and therefore reduce the signal to noise ratio of the data Additionally a portion of the acoustic energy generated by the impacts during testing will be lost due to the mismatch in acoustic impedance between concrete and air To address these problems a parabolic reflector and a sound isolation enclosure were studied and found to improve the quality of recorded signals compared to using a microphone alone Finite element method FEM based numerical simulations were

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-329163251 (2015-11-09)
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  • Framework for Advanced Daily Work Report System
    2009 Iowa State University All rights reserved Framework for Advanced Daily Work Report System Researcher s Principal investigator Hyung Seok David Jeong 515 294 7271 djeong iastate edu Iowa State University Project status Completed Start date 07 01 13 End date 12 31 14 Publications Report Framework for Advanced Daily Work Report System 3 15 mb pdf March 2015 Sponsor s partner s Sponsor s Mid America Transportation Center About the research Abstract A significant amount of time and effort is invested to collect and document various field activity data of a highway project in Daily Work Report DWR Although there are many potential benefits of DWR data the current use of the data is very limited The objective of this study is to develop an ideal framework for an advanced DWR system to improve the DWR data collection and utilization practices A literature review and two surveys were conducted to investigate the current practices of collecting DWR data utilization of the data and challenges associated with advanced collection and utilization of DWR data The study found that there is a huge gap between the current and potential level of benefits of DWR data The challenges for better collection and

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-2032621278 (2015-11-09)
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  • Informational Guide on Road Diets and Other Roadway Reconfigurations
    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 Informational Guide on Road Diets and Other Roadway Reconfigurations Researcher s Principal investigators Keith Knapp 515 294 8817 kknapp iastate edu Project status Completed Start date 09 13 12 End date 12 31 14 Publications Report Road Diet Informational Guide NA pdf November 2014 Sponsor s partner s Sponsor s Federal Highway Administration Office of Safety Partner s Sub with Sam Schwartz Engineering and U of Utah to Leidos About the research Abstract A classic Road Diet converts an existing four lane undivided roadway segment to a three lane segment consisting of two through lanes and a center two way left turn lane TWLTL A Road Diet improves safety by including a protected left turn lane for mid block left turning motorists reducing crossing distance for pedestrians and reducing travel speeds that decrease crash severity Additionally the Road Diet provides an opportunity to allocate excess

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-365129771 (2015-11-09)
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  • Investigation of Field Corrosion Performance and Bond/Development Length of Galvanized Reinforcing Steel
    State University All rights reserved Investigation of Field Corrosion Performance and Bond Development Length of Galvanized Reinforcing Steel Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Co principal investigators Junwon Seo Brian Keierleber Buchanan County Iowa Project status Completed Start date 08 15 13 End date 12 31 14 Publications Report Investigation of Field Corrosion Performance and Bond Development Length of Galvanized Reinforcing

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-325374815 (2015-11-09)
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  • Mass Transit Sustainability in the St. Louis Region
    Researcher s Principal investigator Ray Mundy rmundy umsl edu University of Missouri St Louis Project status Completed Start date 01 01 14 End date 12 31 14 Publications Report Mass Transit Sustainability in the St Louis Region 1 87 mb pdf October 2015 Related publication Mass Transit Sustainability Aug 2015 Sponsor s partner s Sponsor s Midwest Transportation Center University of Missouri Saint Louis USDOT OST R About the research Abstract It has been often suggested that the definition of insanity is doing the same thing and expecting a different outcome Unfortunately a dispassionate evaluation of the current state of public transit in the United States would easily fit this definition Public transportation funding continues to require federal state and local tax reserves in an attempt to address the needs and adapt to the trends of growing urban communities and support sustainable mass transit solutions Fifty years of increased funding for domestic mass transit infrastructure and services has been met with overall ridership decline as a percentage of urban population Caught between looming deficits and a failure to attract consumers is a mangled web of inefficient operations financially unsustainable funding commitments and an inability to adequately modernize transit systems Despite good intentions investments are now contributing to an unsustainable trend Successful and scalable examples of ways to improve sustainability are already in place around the globe and are promoting an era of shared responsibility for mass transit between public and private sectors Latin America being the earliest adopter of modern and sustainable mass transit systems operations and infrastructure has seen great economic and consumer success Now other regions China India South Africa North America and Eastern Europe are committing to innovative and rewarding approaches to leveraging and restructuring mass transit systems Although still a work in progress for some cities

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=2099391107 (2015-11-09)
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  • Modeling Multimodal Freight Transportation Network Performance under Disruptions
    iastate edu Copyright 1996 2009 Iowa State University All rights reserved Modeling Multimodal Freight Transportation Network Performance under Disruptions Researcher s Principal investigators Jing Dong 515 294 3957 jingdong iastate edu Project status Completed Start date 07 01 13 End date 12 31 14 Publications Report Modeling Multimodal Freight Transportation Network Performance under Disruptions 10 89 mb pdf February 2015 Sponsor s partner s Sponsor s Mid America Transportation Center U S DOT RITA About the research Abstract To facilitate a region s freight transportation systems planning and operations and minimize the risk associated with increasing multimodal freight movements this study presents a modeling framework for evaluating and optimizing freight flows on a multimodal transportation network under disruption Unexpected events such as earthquakes floods and other manmade or natural disasters would cause significant economic losses When parts of the transportation network are closed or operated at a reduced capacity the delay of commodity movements would further increase such losses Shifting to an alternative route or mode might help to mitigate the negative impacts In this study a multimodal freight transportation network was developed to simulate commodity movements evaluate the impacts of disruptions and develop effective emergencyoperation plans A fluid based

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-352488468 (2015-11-09)
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  • Optimizing Pavement Base, Subbase and Subgrade Layers for Cost and Performance on Local Roads
    12 31 14 Publications Report Optimizing Pavement Base Subbase and Subgrade Layers for Cost and Performance on Local Roads Final Field Report 18 14 mb pdf December 2014 Related publications Optimizing Pavement Base Subbase and Subgrade Layers for Cost and Performance on Local Roads tech transfer summary 1 40 mb pdf Tech transfer summary Dec 2014 Guidance for Improving Foundation Layers to Increase Pavement Performance on Local Roads off site Dec 2014 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract It is common for local street and road pavements to be constructed from portland cement concrete PCC supported on natural subgrade without considering subgrade treatment or structural support layers such as granular subbase When support layers are considered they typically only serve as a construction platform Incorporation of support layers or subgrade treatment in design has the potential to improve the level of stability and uniformity for the pavement foundation which can result in increased performance and thus increased pavement life A granular subbase for example can improve the drainage under the pavement slab which helps prevent water entrapment in concrete joints which minimizes joint deterioration Mechanical or chemical subgrade stabilization can improve the long term durability of the layer When designing a PCC pavement and foundation system it is important to consider the life cycle cost of the pavement Costs include maintenance over the life of the pavement in addition to the construction cost It has been stated that improvement to the pavement s subgrade and subbase layers will extend pavement life Design Guide for Subgrades and Subbases TR 525 Therefore based on that study the life cycle costs of a pavement placed on subbase or on treated subgrade should be lower than that of a pavement on natural

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1349075806 (2015-11-09)
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  • Pavement Management Performance Modeling: Evaluating the Existing PCI Equations
    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 Pavement Management Performance Modeling Evaluating the Existing PCI Equations Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Co principal investigator Fatih Bektas 515 294 5857 fbektas iastate edu Project status Completed Start date 04 02 13 End date 12 31 14 Publications Report Pavement Management Performance Modeling Evaluating the Existing PCI Equations 2 77 mb pdf December 2014 Tech transfer summary Pavement Management Performance Modeling Evaluating the Existing PCI Equations 143 06 kb pdf Dec 2014 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation About the research Abstract This project included the activities required for the evaluation development and enhancement of the Iowa Department of Transportation DOT pavement condition information as part of their pavement management system operation The study covers all of the Iowa DOT s interstate and primary National Highway System NHS and non NHS system A new pavement condition rating system that provides a consistent unified approach in rating

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=136647723 (2015-11-09)
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