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  • Verification of LRFD Resistance Factors for Drilled Shafts Using Field Tests
    0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Verification of LRFD Resistance Factors for Drilled Shafts Using Field Tests Researcher s Principal investigators Sri Sritharan 515 294 5238 sri iastate edu Iowa State University Co principal investigator Jeramy Ashlock 515 294 6176 jashlock iastate edu Project status In progress Start date 06 25 14 End date 06 30 16 Sponsor s partner s

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1529115889 (2015-11-09)
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  • INV 969: Barriers to Right-of-Way Acquisition and Recommendations for Changes
    1996 2009 Iowa State University All rights reserved INV 969 Barriers to Right of Way Acquisition and Recommendations for Changes Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Project status In progress Start date 06 23 14 End date 02 28 16 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract The Right of Way ROW acquisition process significantly affects the final cost and schedule of a transportation project and is a socially sensitive issue dealing with property owners rights Aleithawe et al 2012 Many counties and cities in Minnesota are spending more than 30 of their transportation project budgets for ROW acquisition Sandberg 2013 The Iowa State research team is currently involved in National Cooperative Highway Research Program NCHRP 15 51 study of preconstruction costs and impacts and as a result is keenly aware that minimizing the cost and time required for ROW acquisition is a high priority in the highly constrained budget environments that Minnesota municipalities and agencies must operate The ROW acquisition process is a complex process made even more complicated process by factors like alignment coordination issues diverse state and local laws conflicting public policies environmental issues public involvement agency staffing appraiser qualifications mediation processes condemnation processes project characteristics parcel types location etc that can significantly affect ROW acquisition cost and duration The team is also working on Strategic Highway Research Program SHRP2 R 10 Strategies for Complex Project Management and has developed a comprehensive understanding of the impacts of those multi dimensional issues and factors on the ROW acquisition and identified tools in use in the nation that may be appropriate for addressing the challenges of the rising ROW acquisition costs and time in Minnesota The proposed study will identify barriers and obstacles that occur during

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-640368870 (2015-11-09)
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  • INV 971: Optimal RAP Content for Minnesota Gravel Roads
    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 INV 971 Optimal RAP Content for Minnesota Gravel Roads Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Project status In progress Start date 06 23 14 End date 10 31 16 Sponsor s partner

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1604819468 (2015-11-09)
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  • MnDOT Alternate Design Methods to Renew Lightly Traveled Paved Roads
    FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved MnDOT Alternate Design Methods to Renew Lightly Traveled Paved Roads Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Project status In progress Start date 06 23 14 End date 08 31 15 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract With the growing acceptance of pavement preservation concepts and declining budgets for road maintenance the interest of highway agencies in low cost pavement maintenance technologies for low volume roads is continuously increasing The conventional maintenance strategy is to apply an asphalt overlay usually more than 2 inches thick to aged pavement surface or reconstruct the pavement when the life of a road ends Both of these strategies have been proven to be less cost effective when compared to alternate technologies that are designed to extend the road service life and improve conditions of the surface and structure at lower costs Such technologies include a variety of base and surface treatments over a wide range from pavement preventive maintenance methods to rehabilitation methods such as thin and ultra thin hot mix asphalt HMA

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1411589091 (2015-11-09)
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  • Pavement Performance: New Approaches using Data Analytics
    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 Pavement Performance New Approaches using Data Analytics Researcher s Principal investigator Ravi Nath rnath creighton edu Creighton University Project status In progress Start date 06 14 14 End date

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1226130922 (2015-11-09)
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  • Design and Performance Verification of a Bridge Column/Footing/Pile System for Accelerated Bridge Construction (ABC)
    rights reserved Design and Performance Verification of a Bridge Column Footing Pile System for Accelerated Bridge Construction ABC Researcher s Principal investigators Sri Sritharan 515 294 5238 sri iastate edu Iowa State University Co principal investigators Jeramy Ashlock 515 294 6176 jashlock iastate edu Brent Phares 515 294 5879 bphares iastate edu Iowa State University Project status In progress Start date 06 01 14 End date 05 31 16 Sponsor s partner s Sponsor s Federal Highway Administration State Transportation Innovation Council STIC Incentive funding Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Accelerated bridge construction ABC has gained significant momentum among various state departments of transportation DOTs as it helps in reducing the period of onsite construction thereby reducing the impact to the traveling public In addition the FHWA has recently initiated an effort to reduce the time required to bring new bridges into service and has also increased the design life of bridges from 50 to 75 years In response to these changes and to facilitate ABC practices several state DOTs have developed a variety of structural connection details for prefabricated bridge elements ranging from full depth precast deck panels to precast girders to

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-909977509 (2015-11-09)
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  • Risk-Based Bridge Management: A Methodology to Assess and Incorporate Risk in Decision-Making
    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 Risk Based Bridge Management A Methodology to Assess and Incorporate Risk in Decision Making Researcher s Principal investigator Basak Aldemir Bektas 515 294 4033 basak iastate edu Co principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Project status In progress Start date 06 01 14 End date 05 31 16 Sponsor s partner s Sponsor s Iowa Department of Transportation Midwest Transportation Center USDOT OST R About the research Abstract In recent years risk based management of infrastructure assets has gained precedence in infrastructure asset management The Moving Ahead for Progress in the 21st Century Act MAP 21 aligned with this progress requires state transportation agencies to incorporate risk based management in planning systematic preventive maintenance replacement or rehabilitation decisions for their bridge networks However the legislation does not provide guidance on a methodology states are flexible in what type of methodology they choose or how they define risk At present state agencies are challenged by identifying and quantifying these

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1587454895 (2015-11-09)
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  • Performance and Load Response of Rigid Pavement Systems
    software for variables and pavement conditions at state and local levels This in turn requires the collection of region specific field data on climate material properties load response and pavement performance for use in calibration and implementation of the software Mechanistic Empirical Pavement Design software uses these data inputs to more accurately simulate the load response of pavements and long term pavement performance Local calibration of the software involves comparing long term performance simulation results to actual performance data at local sites if possible or from matching pavements in the Federal Highway Administration Long Term Pavement Performance LTPP database Several numerical models are available to predict pavement performance and these models are an effective tool to predict the likelihood of pavement damage and longevity These numerical models also enable improvements in road design methods whether for new or rehabilitated pavements that will help mitigate the problems of load induced damage However most of these models have not been calibrated against actual field data obtained under realistic conditions To enhance the effectiveness of these models and to assist in their application instrumented test sections of pavement can be monitored and data gathered to monitor performance factors such as soil pressure pavement temperature strains and deflections caused by daily changes in temperature within the pavement along with air temperature wind speed relative humidity solar radiation and precipitation The pavement construction process can also be monitored and the materials used in the pavement can be tested in the laboratory or in the field using non destructive testing to ascertain material property information As pavement systems are highly nonlinear in their responses to loads and load related strains field data collected via instrumentation helps indicate which parameters need to be emphasized in the models to describe pavement performance and response to conditions Data from the laboratory tests or from non destructive field testing is input to the model to predict the road response The predicted response is then compared to the measured response A sensitivity analysis also helps determine which parameters should be adjusted to best fit actual conditions Also the LTPP database can be used for calibration in addition to data related to material properties traffic data and pavement performance data provided by other DOTs In the long term the calibrated model is used in conjunction with existing Mechanistic Empirical design models and Mechanistic Empirical Pavement Design software to improve the design method The data can be put into a format directly useful to designers and engineers Since 2001 the New York State Department of Transportation NYSDOT has significantly invested in instrumenting test pavement sections to acquire local data to improve calibration of Mechanistic Empirical Pavement Design software The instrumented field pavements in New York include Interstate 490 Interstate 90 and Interstate 86 The installed sensors are still functioning to an extent that permits data collection of additional useful scientific information and I 490 is providing high quality data that will positively impact future design construction and maintenance of roads As NYSDOT progresses

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-67350441 (2015-11-09)
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