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  • Integration of Road Weather Information with Traffic Data
    Bridge De icing Pilot Project Researcher s Principal investigator Tom Maze Student researchers Manish Agarwal Garrett Burchett Project status Completed Start date 08 01 04 End date 07 31 05 Publications Reports Impact of Weather on Urban Freeway Traffic Flow Characteristics and Facility Capacity technical report 461 kb pdf August 2005 Whether Weather Matters to Traffic Demand Traffic Safety and Traffic Flow general report 261 kb pdf August 2005 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Adverse weather reduces the capacities and operating speeds on roadways resulting in congestion and productivity loss A thorough understanding of the mobility impacts of weather on traffic patterns is necessary to estimate speed and capacity reductions Nearly all traffic engineering guidance and methods used to estimate highway capacity assume clear weather However for many northern states inclement weather conditions occur during a significant portion of the year The technical report describes how the authors quantified the impact of rain snow and pavement surface conditions on freeway traffic flow for the metro freeway region around the Twin Cities The research database includes four years of traffic data from in pavement system detectors weather data over the same period from 3 automated surface observing systems ASOS and two years of available weather data from 5 road weather information systems RWIS sensors at the freeway s roadside Our research classifies weather events by their intensities and identifies how changes in weather type and intensities impact the speed headways and capacity of roadways Results indicate that severe rain snow and low visibility cause the most significant reductions in capacities and operating speeds Rain more than 0 25 inch hour snow more than 0 5 inch hour and low visibility less than 0 25 mile showed capacity reductions of 10 17 19

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1210377284 (2015-11-09)
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  • Applications for Reuse of Lime Sludge from Water Softening (TR-535)
    Completed Start date 07 15 04 End date 07 15 05 Publications Report Applications for Reuse of Lime Sludge from Water Softening 1 10 mb pdf July 2005 Sponsor s partner s Sponsor s Ames Power Plant BMG Biosolids Cedar Rapids Water Department City of Ames Des Moines Water Works Iowa Department of Transportation Iowa Highway Research Board Kelderman Lime Newton Water Works Story County Engineer West Des Moines Water Works About the research Abstract Lime sludge an inert material mostly composed of calcium carbonate is the result of softening hard water for distribution as drinking water A large city such as Des Moines Iowa produces about 30 700 tons of lime sludge dry weight basis annually Jones et al 2005 Eight Iowa cities representing according to the U S Census Bureau 23 of the state s population of 3 million were surveyed They estimated that they collectively produce 64 470 tons of lime sludge dry weight basis per year and they currently have 371 800 tons dry weight basis stockpiled Recently the Iowa Department of Natural Resources directed those cities using lime softening in drinking water treatment to stop digging new lagoons to dispose of lime sludge Five Iowa cities with stockpiles of lime sludge funded this research The research goal was to find useful and economical alternatives for the use of lime sludge Feasibility studies tested the efficacy of using lime sludge in cement production power plant SOx treatment dust control on gravel roads wastewater neutralization and in fill materials for road construction Applications using lime sludge in cement production power plant Sox treatment and wastewater neutralization and as a fill material for road construction showed positive results but the dust control application did not Since the fill material application showed the most promise in accomplishing the project

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1122218602 (2015-11-09)
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  • Development of Internet-based RWIS (Road Weather Information System) AWOS (Airport Weather Observation System) Information Delivery Tools (AKA Weatherview)
    All rights reserved Development of Internet based RWIS Road Weather Information System AWOS Airport Weather Observation System Information Delivery Tools AKA Weatherview Researcher s Principal investigators Reginald Souleyrette Co principal investigator Bill McCall Project status Completed Start date 10 01 99 End date 06 30 05 Project webpage http www dotweatherview com Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract Weatherview is a traveler

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=377 (2015-11-09)
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  • Field Evaluation of Elliptical Fiber Reinforced Polymer Dowel Performance (Proj. 5)
    Dowel Performance Proj 5 Dowel bar basket assembly bars at 10 inch spacing Researcher s Principal investigators Max Porter 515 294 7456 mporter iastate edu Co principal investigators James K Cable Cable Concrete Consultation Student researchers John Harrington Anthony Post Nathan Pierson Project status Completed Start date 07 22 02 End date 06 30 05 Publications Report Field Evaluation of Elliptical Fiber Reinforced Polymer Dowel Performance Proj 5 2 mb pdf June 2005 Tech transfer summary Elliptical Fiber Reinforced Polymer Dowel Performance pdf Oct 2005 Sponsor s partner s Sponsor s Federal Highway Administration Hughes Brothers About the research Abstract Fiber reinforced polymer FRP composite materials are making an entry into the construction market in both buildings and pavements The application to pavements so far has come in the form of joint reinforcement dowels and tie bars FRP resistance to salt corrosion in dowels has made it an alternative to standard epoxy coated steel dowels for pavements Iowa State University has completed a large amount of laboratory research to determine the diameter spacing and durability of FRP dowels This report documents the performance of elliptical FRP dowels installed in a field situation Ten joints were monitored in three consecutive test

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1077045773 (2015-11-09)
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  • Field Testing of Integral Abutments (HR-399)
    Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract Integral abutment bridges which do not contain expansion joints provide a very attractive alternative to the more traditional stub abutment bridges that have expansion joints Jointless bridges have lower construction and maintenance costs than those costs for bridges with expansion joints The integral connection between the abutment bridge girders and piles introduces additional strains and corresponding stresses in the bridge members as a result of thermal expansion and contraction of the bridge superstructure Experience of bridge engineers from many state departments of transportation who design and construct integral abutment bridges indicate that these bridges are performing well The objectives of this research program were to evaluate the state of art for the design of prestressed concrete PC integralabutment bridges to validate the assumptions that are incorporated in the current design procedures for these types of bridges when they are subjected to thermal loading conditions and as appropriate to revise and improve the current design procedures for this type of a bridge as that design relates to the thermally induced displacements of the abutments and the thermally induced forces in the abutments and abutment piles Two skewed PC girder integral abutment bridges in the State of Iowa were instrumented over a two year period to measure structural behavior Longitudinal and transverse displacements and rotation of the integral abutments strains in the steel piles and in the PC girders and temperature distributions were recorded throughout the monitoring period for both bridges The coefficient of thermal expansion and contraction for the concrete in core specimens that were taken from 20 bridge decks and from several PC girders was experimentally measured at the 100 dry and 100 saturated conditions The longitudinal displacements of the integral abutments

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=321 (2015-11-09)
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  • Four-Lane to Three-Lane Analysis
    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 Four Lane to Three Lane Analysis Similar related projects Guidelines for the Conversion of 4 lane Undivided Roadways to 3 lane 2 way Left turn Lane Facilities Researcher s Principal investigators Reginald Souleyrette Student researcher Thomas B Stout Project status Completed Start date 01 01 05 End date 06 30 05 Publications Project webpage http www ctre iastate edu research 4laneto3lane htm Related publications Three lanes really can be safer than four pdf Technology News Jun 2006 Four Lane to Three Lane Conversions pdf Tech transfer summary Apr 2006 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract The safety impacts of the conversion of a 4 lane undivided roadway to a 3 lane roadway are evaluated using classical before and after studies with yoked pairs and the cities of some 14 sites Iowa DOT databases were used to evaluate the changes in the

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=646830874 (2015-11-09)
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  • Implementing the Mechanistic-Empirical Pavement Design Guide (TR-509)
    8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Implementing the Mechanistic Empirical Pavement Design Guide TR 509 Researcher s Principal investigators Brian Coree Co principal investigators Halil Ceylan 515 294 8051 hceylan iastate edu Iowa State University Dale Harrington Snyder Student researchers Alper Guclu Sung Hwan Kim Project status Completed Start date 11 01 03 End date 06 30 05 Publications Reports Implementing the Mechanistic Empirical Pavement Design Guide TR 509 Implementation Plan 1 3 mb pdf June 2005 Implementing the Mechanistic Empirical Pavement Design Guide TR 509 Technical Report 4 7 mb pdf June 2005 Tech transfer summary Implementing the M E Pavement Design Guide in Iowa pdf May 2005 Sponsor s partner s Sponsor s Iowa Highway Research Board About the research Abstract The current 1993 American Association of State Highway and Transportation Officials AASHTO Pavement Design Guide is based on the empirical interpretation of the results of the 1960 AASHTO Road Test With the release of the new Mechanistic Empirical M E Pavement Design Guide pavement design has taken a quantum leap forward Implementation Plan In order to effectively and efficiently transition to the M E

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1853830914 (2015-11-09)
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  • Iowa Pavement Management Program, Phase X
    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 Iowa Pavement Management Program Phase X Similar related projects Implementation of Iowa DOT Pavement Management Optimization Model

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-2038131106 (2015-11-09)
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