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  • Development of HMA Dynamic Modulus Master Curve Using FWD Data
    University Co principal investigators Kasthurira Gopalakrishnan 515 294 3044 rangan iastate edu Iowa State University Sunghwan Kim sunghwan iastate edu Project status Completed Start date 05 15 13 End date 05 14 14 Publications Report Development of Asphalt Dynamic Modulus Master Curve Using Falling Weight Deflectometer Measurements 4 51 mb pdf October 2014 Tech transfer summary Development of Asphalt Dynamic Modulus Master Curve Using Falling Weight Deflectometer Measurements 721 76 kb pdf Oct 2014 Sponsor s partner s Sponsor s Iowa Department of Transportation Iowa Highway Research Board About the research Abstract The asphalt concrete AC dynamic modulus E is a key design parameter in mechanistic based pavement design methodologies such as the American Association of State Highway and Transportation Officials AASHTO MEPDG Pavement ME Design The objective of this feasibility study was to develop frameworks for predicting the AC E master curve from falling weight deflectometer FWD deflection time history data collected by the Iowa Department of Transportation Iowa DOT A neural networks NN methodology was developed based on a synthetically generated viscoelastic forward solutions database to predict AC relaxation modulus E t master curve coefficients from FWD deflection time history data According to the theory of viscoelasticity if AC relaxation modulus E t is known E can be calculated and vice versa through numerical inter conversion procedures Several case studies focusing on full depth AC pavements were conducted to isolate potential backcalculation issues that are only related to the modulus master curve of the AC layer For the proof of concept demonstration a comprehensive full depth AC analysis was carried out through 10 000 batch simulations using a viscoelastic forward analysis program Anomalies were detected in the comprehensive raw synthetic database and were eliminated through imposition of certain constraints involving the sigmoid master curve coefficients The surrogate forward

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1670453428 (2015-11-09)
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  • Deicer Scaling Resistance of Concrete Mixtures Containing Slag Cement
    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 Deicer Scaling Resistance of Concrete Mixtures Containing Slag Cement Researcher s Principal investigators Peter Taylor 515 294 9333 ptaylor iastate edu Co principal investigator Doug Hooton Project status Completed Start date 04 15 10 End date 03 31 14 Publications Report Deicer Scaling Resistance of Concrete Mixtures Containing Slag Cement 514 95 kb pdf January 2014 Sponsor s partner s Sponsor s Federal Highway Administration Transportation Pooled Fund About the research Abstract Concern has been expressed about the deicer scaling resistance of concrete containing slag especially when the dosage of slag exceeds 50 of the total cementitious material in the mixture Much of the concern appears to be based on the results of laboratory scaling tests based on ASTM C 672 despite indications that such mixtures often perform well in the field The initial phase of this study showed that construction related issues played a bigger role in the observed scaling performance than did the amount of slag in the concrete mixture

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1552735088 (2015-11-09)
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  • Development of a Maintenance Workers Manual for the Alaska Department of Transportation
    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 Development of a Maintenance Worker s Manual for the Alaska Department of Transportation Researcher s Principal investigator Tom McDonald Project status Completed Start date 02 01 13 End date 02 01 14 Sponsor s partner s Sponsor s Alaska Department of

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-109535240 (2015-11-09)
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  • Iowa Mass Concrete for Bridge Foundations Study - Phase II
    investigators Charles Jahren 515 294 3829 cjahren iastate edu Co principal investigators Kejin Wang 515 294 2152 kejinw iastate edu Iowa State University Student researchers Jacob Shaw Jinxin Linda Li Project status Completed Start date 01 01 12 End date 01 31 14 Publications Report Iowa Mass Concrete for Bridge Foundations Study Phase II 15 05 mb pdf February 2014 Tech transfer summary Iowa Mass Concrete for Bridge Foundations Study Phase II 210 13 kb pdf Feb 2014 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation About the research Abstract The early age thermal development of structural mass concrete elements has a significant impact on the future durability and longevity of the elements If the heat of hydration is not controlled the elements may be susceptible to thermal cracking and damage from delayed ettringite formation In the Phase I study the research team reviewed published literature and current specifications on mass concrete In addition the team observed construction and reviewed thermal data from the westbound WB I 80 Missouri River Bridge Finally the researchers conducted an initial investigation of the thermal analysis software programs ConcreteWorks and 4C Temp Stress The

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1355505897 (2015-11-09)
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  • Comparison of Setting Time Measured Using Ultrasonic Wave Propagation With Saw-Cutting Times on Pavements in Iowa
    edu Copyright 1996 2009 Iowa State University All rights reserved Comparison of Setting Time Measured Using Ultrasonic Wave Propagation With Saw Cutting Times on Pavements in Iowa Researcher s Principal investigators Peter Taylor 515 294 9333 ptaylor iastate edu Student researcher Xuhao Wang Project status Completed Start date 01 01 13 End date 01 30 14 Publications Report 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 Sponsor s partner s Sponsor s FHWA Pooled Fund Study TPF 5 205 About the research Abstract Concrete setting behavior strongly influences scheduling of construction operations such as surfacing trowelling jointing and saw cutting To conduct pavement sawing activities effectively it is useful for contractors to know when a concrete mixture is going to reach initial set or when the sawing window will open Monitoring the set time of a fresh mixture also provides a tool to assess the uniformity between material and concrete batches The aim of this project was to confirm that initial set could be measured using an ultrasonic pulse velocity UPV approach and to assess whether there was

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1664553186 (2015-11-09)
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  • Field Monitoring of Curved Girder Bridges with Integral Abutments
    rights reserved Field Monitoring of Curved Girder Bridges with Integral Abutments Project involves all of the bridges at the I 80 I 235 I 35 interchange in Des Moines Iowa Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Project status Completed Start date 06 01 08 End date 01 01 14 Publications Report Field Monitoring of Curved Girder Bridges with Integral Abutments 15 24 mb pdf January 2014 Related publications Field Monitoring of Curved Girder Bridges with Integral Abutments 149 17 kb pdf Tech transfer summary Jan 2014 Evaluation of Bridge Movement Measurement Using GPS 442 85 kb pdf Tech transfer summary Jan 2012 Sponsor s partner s Sponsor s Federal Highway Administration Transportation Pooled Fund Iowa Department of Transportation Ohio Department of Transportation Pennsylvania Department of Transportation Wisconsin Department of Transportation About the research Abstract Nationally there is concern regarding the design fabrication and erection of horizontally curved steel girder bridges due to unpredicted girder displacements fit up and locked in stresses One reason for the concerns is that up to one quarter of steel girder bridges are being designed with horizontal curvature The concerns are significant enough that a National Cooperative

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=424330467 (2015-11-09)
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  • AASHTOWare BrM Bridge Management System Implementation and Operation
    515 294 8103 FAX 515 294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved AASHTOWare BrM Bridge Management System Implementation and Operation Researcher s Principal investigators Omar Smadi 515 294 7110 smadi iastate edu Iowa State University Co principal investigator Basak Aldemir Bektas 515 294 4033 basak iastate edu Project status Completed Start date 11 06 06 End date 12 31 13 Sponsor s partner s Sponsor s Iowa Department of Transportation About the research Abstract The objective of this project is to provide support to the Iowa Department of Transportation DOT to implement and operate AASHTO s PONTIS bridge management software PONTIS is a comprehensive bridge management system developed as a tool to assist in the challenging task of bridge management PONTIS stores bridge inventory and inspection data formulates network wide preservation and improvement policies for use in evaluating the needs of each bridge in a network and makes recommendations for which projects to include in an agency s capital plan for deriving the maximum benefit from limited funds The Iowa DOT has been working on the development and implementation of their bridge management system using PONTIS The system will allow the

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-920215122 (2015-11-09)
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  • Boone County Expo Research Phase I - Granular Road Compaction and Stabilization
    geogrid for subgrade stabilization Triaxial geogrid for subgrade stabilization Geocell reinforcement of subbase Researcher s Principal investigators David White 515 294 1463 djwhite iastate edu Co principal investigators Pavana Vennapusa 515 294 2395 pavanv iastate edu Student researcher Peter Becker Project status Completed Start date 03 14 12 End date 12 31 13 Publications Reports Tech Brief High Energy Impact Roller Compaction 731 14 kb pdf December 2013 Tech Brief Overview of Foundation Stabilization Technologies 5 31 mb pdf December 2013 Tech Brief Roller Integrated Compaction Monitoring of Subbase 4 37 mb pdf December 2013 Tech Brief Stiffness Based QC QA Testing 1 98 mb pdf December 2013 Tech Brief Subgrade Stabilization Using Geosynthetics 3 41 mb pdf December 2013 Related publications Tech Brief Fly Ash Stabilization of Subgrade 2 53 mb pdf Tech transfer summary Dec 2013 Tech Brief Cement Stabilization of Subbase and Subgrade 3 20 mb pdf Tech transfer summary Dec 2013 Tech Brief Cement Stabilization with Fiber Reinforcement of Subbase 2 95 mb pdf Tech transfer summary Dec 2013 Tech Brief Mechanical Stabilization of Subgrade Layer 2 79 mb pdf Tech transfer summary Dec 2013 Tech Brief Geocell Reinforcement of Subbase 2 04 mb pdf Tech transfer summary Dec 2013 Tech Brief On Site Reclaimed Material as Subbase Layer 2 08 mb pdf Tech transfer summary Dec 2013 phase II video off site Nov 2013 Boone county expo mp4 off site Mar 2013 Sponsor s partner s Sponsor s Boone County Iowa Federal Highway Administration State Planning and Research Funding Iowa Department of Transportation Partner s Iowa Department of Transportation Boone County Iowa Engineer About the research Abstract The Iowa Department of Transportation DOT worked with its research partners to design comparative pavement foundation test sections at the Central Iowa Expo Site in Boone Iowa The

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-275497063 (2015-11-09)
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