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  • Major Equipment Life-Cycle Cost Analysis
    State University All rights reserved Major Equipment Life Cycle Cost Analysis Researcher s Principal investigators Doug Gransberg 515 294 2140 dgran iastate edu Project status Completed Start date 08 12 13 End date 04 30 15 Publications Report Major Equipment Life Cycle Cost Analysis NA pdf April 2015 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract Equipment life cycle cost analysis LCCA is typically used as one component of the equipment fleet management process and allows the fleet manager to make equipment repair replacement and retention decisions on the basis of a given piece of equipment s economic life The objective of this research was to develop a robust method that permits equipment fleet managers to maximize the cost effectiveness of the fleet by optimizing the overall life cycle value of each piece in the fleet Minneapolis Public Works Fleet Services Division MPWFSD equipment fleet data were utilized in developing the proposed stochastic LCCA model for the public agency s fleet The research compared output using actual data from current software to output from the new stochastic LCCA method using equipment deterioration curves and probabilistic input variables for capital costs fuel and other operating

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-349441815 (2015-11-09)
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  • Iowa's Bridge and Highway Climate Change and Extreme Weather Vulnerability Assessment Pilot
    Vulnerability Assessment Pilot I 80 near Davenport Iowa in 2008 Keven Arrowsmith Iowa DOT I 35 and US 30 in Ames Iowa 2010 James Moreland retired Iowa DOT Motor Vehicle Enforcement Researcher s Principal investigator Gene Takle gstakle iastate edu ISU Climate Science Program Co principal investigator Chris Anderson cjames iastate edu ISU Climate Science Program Project status Completed Start date 10 15 13 End date 04 01 15 Publications Report Iowa s Bridge and Highway Climate Change and Extreme Weather Vulnerability Assessment Pilot 2 77 mb pdf April 2015 Tech transfer summary Iowa s Bridge and Highway Climate Change and Extreme Weather Vulnerability Assessment Pilot 1 96 mb pdf Apr 2015 Sponsor s partner s Sponsor s Federal Highway Administration Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation Statewide Transportation Improvement Program STIP Partner s University of Iowa Iowa DOT BridgeWatch About the research Abstract The Iowa Department of Transportation DOT is responsible for approximately 4 100 bridges and structures that are a part of the state s primary highway system which includes the Interstate US and Iowa highway routes A pilot study was conducted for six bridges in two Iowa river basins the Cedar River Basin and the South Skunk River Basin to develop a methodology to evaluate their vulnerability to climate change and extreme weather The six bridges had been either closed or severely stressed by record streamflow within the past seven years An innovative methodology was developed to generate streamflow scenarios given climate change projections The methodology selected appropriate rainfall projection data to feed into a streamflow model that generated continuous peak annual streamflow series for 1960 through 2100 which were used as input to PeakFQ to estimate return intervals for floods The methodology evaluated the plausibility of rainfall projections and credibility

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1076895620 (2015-11-09)
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  • Aggregate Road Surface Rejuvenation
    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 Aggregate Road Surface Rejuvenation Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Project status Completed Start date 01 30 13 End date 03 31 15 Publications Report Aggregate Road Surface Rejuvenation NA pdf April 2015 Related publication Blending Fines into Existing Loose Gravel Costs Less Than Regraveling Feb 2015 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract Aggregate surfaced roads become coarser and coarser after a few years of service due to an inherent problem dust emission Fines in the surfacing material are kicked up by traffic and blown away by the wind as fugitive dust One of the alternative rejuvenation methods is to replenish the missing fines to restore the gradation and plasticity of the in situ material Savings in the material and cost could in return benefit the environment and financial condition of the jurisdiction Control and experimental test sections were established in three counties of Minnesota and performance of the sections were assessed using methods

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-326583257 (2015-11-09)
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  • Assessment of Asphalt Interlayer Designed on Jointed Concrete Pavement
    515 294 4419 rwilliam iastate edu Iowa State University Project status Completed Start date 07 01 13 End date 03 31 15 Publications Report Assessment of Asphalt Interlayer Designed on Jointed Concrete Pavement 1 76 mb pdf December 2014 Tech transfer summary Assessment of Asphalt Interlayer Designed on Jointed Concrete Pavement 397 87 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 Reflective cracking in hot mix asphalt HMA overlays has been a common cause of poor pavement performance in Iowa for many years Reflective cracks commonly occur in HMA overlays when deteriorated portland cement concrete is paved over with HMA This results in HMA pavement surfaces with poor ride quality and increased transportation maintenance costs To delay the formation of cracks in HMA overlays the Iowa Department of Transportation DOT has begun to implement a crack relief interlayer mix design specification The crack relief interlayer is an asphalt rich highly flexible HMA that can resist cracking in high strain loading conditions In this project the field performance of an HMA overlay using a one inch interlayer was compared to a conventional HMA

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-162657904 (2015-11-09)
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  • Assessment of Non-Destructive Testing Technologies for Quality Control/Quality Assurance Testing of Asphalt Mixtures
    status Completed Start date 01 01 13 End date 03 31 15 Publications Report Assessment of Non Destructive Testing Technologies for Quality Control Quality Assurance of Asphalt Mixtures 20 1 mb pdf April 2015 Tech transfer summary Assessment of Non Destructive Testing Technologies for Quality Control Quality Assurance Testing of Asphalt Mixtures 616 46 kb pdf Mar 2015 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation Iowa Highway Research Board Partner s University of Iowa About the research Abstract Asphalt pavements suffer various failures due to insufficient quality within their design lives The American Association of State Highway and Transportation Officials AASHTO Mechanistic Empirical Pavement Design Guide MEPDG has been proposed to improve pavement quality through quantitative performance prediction Evaluation of the actual performance quality of pavements requires in situ nondestructive testing NDT techniques that can accurately measure the most critical objective and sensitive properties of pavement systems The purpose of this study is to assess existing as well as promising new NDT technologies for quality control quality assurance QC QA of asphalt mixtures Specifically this study examined field measurements of density via the PaveTracker electromagnetic gage shear wave velocity via surface wave testing methods and dynamic stiffness via the Humboldt GeoGauge for five representative paving projects covering a range of mixes and traffic loads The in situ tests were compared against laboratory measurements of core density and dynamic modulus The in situ PaveTracker density had a low correlation with laboratory density and was not sensitive to variations in temperature or asphalt mix type The in situ shear wave velocity measured by surface wave methods was most sensitive to variations in temperature and asphalt mix type The in situ density and in situ shear wave velocity were combined to calculate

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1377876078 (2015-11-09)
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  • Concrete Pavement Mixture Design and Analysis
    1996 2009 Iowa State University All rights reserved Concrete Pavement Mixture Design and Analysis Researcher s Principal investigators Peter Taylor 515 294 9333 ptaylor iastate edu Project status Completed Start date 05 15 09 End date 03 31 15 Publications Reports Concrete Pavement Mixture Design and Analysis MDA An Innovative Approach to Proportioning Concrete Mixtures 1 64 mb pdf March 2015 Download Spreadsheet Concrete Pavement Mixture Design and Analysis MDA Application of a Portable X Ray Fluorescence Technique to Assess Concrete Mix Proportions 831 90 kb pdf March 2012 Concrete Pavement Mixture Design and Analysis MDA Assessment of Air Void System Requirements for Durable Concrete 723 45 kb pdf June 2012 Concrete Pavement Mixture Design and Analysis MDA Comparison of Setting Time Measured Using Ultrasonic Wave Propagation With Saw Cutting Times on Pavements in Iowa 948 09 kb pdf January 2014 Concrete Pavement Mixture Design and Analysis MDA Development and Evaluation of Vibrating Kelly Ball Test VKelly Test for the Workability of Concrete 1 08 mb pdf March 2015 Concrete Pavement Mixture Design and Analysis MDA Effect of Aggregate Systems on Concrete Mixture Properties 1 07 mb pdf July 2012 Concrete Pavement Mixture Design and Analysis MDA Effect of Paste Quality on Fresh and Hardened Properties of Ternary Mixtures 1 20 mb pdf July 2012 Concrete Pavement Mixture Design and Analysis MDA Evaluation of Foam Drainage Test to Measure Air Void Stability in Concrete 666 68 kb pdf March 2015 Concrete Pavement Mixture Design and Analysis MDA Evaluation of the Fresh and Hardened Properties of Concrete Mixtures Containing Permeability Reducing Admixtures to Develop Standard Test Protocol 2 46 mb pdf November 2014 Concrete Pavement Mixture Design and Analysis MDA Factors Influencing Drying Shrinkage 586 80 kb pdf November 2015 Concrete Pavement Mixture Design and Analysis MDA Guide Specification for Highway

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=531824887 (2015-11-09)
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  • Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures - Phase II
    Principal investigators Chris Williams 515 294 4419 rwilliam iastate edu Iowa State University Hosin David Lee University of Iowa Project status Completed Start date 05 15 13 End date 03 31 15 Publications Report Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures Phase II NA pdf March 2015 Tech transfer summary Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures Phase II Mar 2015 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract To conserve natural resources and energy the amount of recycled asphalt pavement has been steadily increasing in the construction of asphalt pavements The objective of this study is to develop quality standards for inclusion of high RAP content To determine if the higher percentage of RAP materials can be used on Iowa s state highways three test sections with target amounts of RAP materials of 30 35 and 40 by weight were constructed on Highway 6 in Iowa City To meet Superpave mix design requirements for mixtures with high RAP contents it was necessary to fractionate the RAP materials Three test sections with actual RAP materials of 30 0 35 5 and 39 2 by weight were constructed and the average field densities from the cores were measured as 95 3 94 0 and 94 3 respectively Field mixtures were compacted in the laboratory to evaluate moisture sensitivity using a Hamburg Wheel Tracking Device After 20 000 passes rut depths were less than 3mm for mixtures obtained from three test sections The binder was extracted from the field mixtures from each test section and tested to identify the effects of RAP materials on the performance grade of the virgin binder Based on Dynamic Shear Rheometer

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=573908266 (2015-11-09)
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  • Lightly-Surfaced Roads: Stabilized Aggregate Applications
    University All rights reserved Lightly Surfaced Roads Stabilized Aggregate Applications Researcher s Principal investigators Charles Jahren 515 294 3829 cjahren iastate edu Co principal investigators Doug Gransberg 515 294 2140 dgran iastate edu Project status Completed Start date 11 15 12 End date 03 31 15 Publications Report Lightly Surfaced Roads Stabilized Aggregate Applications NA pdf February 2015 Sponsor s partner s Sponsor s Minnesota Department of Transportation About the research Abstract Minnesota has a large network of aggregate roads The majority of the system is maintained by counties and townships Some of the aggregate roads need to be upgraded with a sealed surface for dust control or to provide a smoother driving experience as well as for local economic development Local road officials are often faced with the responsibility of upgrading the roads with a limited budget Light surface treatments LSTs are considered an economical alternative to the conventional upgrade approaches using hot mix asphalt HMA or concrete pavements The currently used methods in Minnesota for the structural design of LSTs for aggregate roads were originally developed for structural design of flexible pavements This research evaluated the design methods that can be used to design LSTs for aggregate roads

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1705255346 (2015-11-09)
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