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  • Optimizing Performance Characteristics of Steel Fiber-Reinforced Lightweight Concrete (SFRLWC) for Wearing Surface Application on Orthotropic Steel Decks
    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 Optimizing Performance Characteristics of Steel Fiber Reinforced Lightweight Concrete SFRLWC for Wearing Surface Application on Orthotropic Steel Decks Researcher s Principal investigator Vellore Gopalaratnam University of Missouri Columbia

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1656203067 (2015-11-09)
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  • Bridges for Life: Better Data in Support of Performance Management Analysis
    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 Bridges for Life Better Data in Support of Performance Management Analysis Researcher s Principal investigator Glenn Washer University of Missouri Columbia Project status

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1366302068 (2015-11-09)
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  • Developing Risk-Based Bridge Inspection Practices
    Research 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 Developing Risk Based Bridge Inspection Practices Researcher s Principal investigator Glenn Washer University of

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1526650387 (2015-11-09)
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  • LRFD Minimum Flexural Reinforcement Requirements
    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 LRFD Minimum Flexural Reinforcement Requirements Researcher s Principal investigators Sri Sritharan 515 294 5238 sri iastate edu Iowa State University Project status In progress Start date 09 30 13 End date 12 29 16 Sponsor s partner s Sponsor s American Association of State Highway and Transportation Officials AASHTO Federal Highway Administration National Cooperative Highway Research Program NCHRP About the research Abstract According to the American Association of State Highway and Transportation Officials AASHTO Load and Resistance Factor Design LRFD Bridge Design Specifications minimum reinforcement provisions are intended to reduce the probability of brittle failure by providing flexural capacity greater than the cracking moment There is a concern with the current AASHTO LRFD minimum flexural reinforcement requirements when it s applied to pretensioned or post tensioned concrete flexural members Increasing the nominal capacity of a member can result in increasing the cracking moment of the same member This makes the design process iterative and the current minimum reinforcement requirement for post tensioned members is difficult to satisfy This also may lead to less efficient

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-2091452883 (2015-11-09)
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  • Next Generation Concrete Pavement Road Map
    Taylor 515 294 9333 ptaylor iastate edu Project status In progress Start date 09 15 13 End date 09 14 18 Publications Report Long Term Plan for Concrete Pavement Research and Technology The Concrete Pavement Road Map Second Generation Volume I Background and Summary NA pdf April 2012 Sponsor s partner s Sponsor s Federal Highway Administration Transportation Pooled Fund About the research Abstract The Concrete Pavement CP Road Map The CP Road Map 2nd Edition is comprised of 12 integrated research tracks with more than 250 research problem statements It provides a collaborative structure for existing local state and national concrete pavement research programs to focus their investments on stakeholder identified needs and priorities This Next Gen CP Road Map pooled fund will continue this on going effort to synthesize concrete pavement research initiatives and needs for the nation particularly in three subject areas The CP Road Map was updated at the conclusion of the Federal Highway Administration FHWA Ied pooled fund in June 2012 Increasingly state departments of transportation DOTs are challenged to design and build longer life concrete pavements that result in a higher level of user satisfaction for the public with fewer resources One of the

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=560176627 (2015-11-09)
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  • Performance and Design of Bridge Approach Panels in Wisconsin
    State University All rights reserved Performance and Design of Bridge Approach Panels in Wisconsin Researcher s Principal investigators Brent Phares 515 294 5879 bphares iastate edu Iowa State University Justin Dahlberg Project status In progress Start date 08 13 13 End date 02 12 15 Sponsor s partner s Sponsor s Federal Highway Administration State Planning and Research Funding Wisconsin Department of Transportation About the research Abstract Within the recent past the Wisconsin DOT changed the bridge approach slab design from a system using only one expansion joint to a system using three expansion joints SDD 13B2 This change was due primarily to the need to accommodate differential expansion and contraction between the approach pavement and the bridge Since implementing the new design detail the Wisconsin DOT has become aware of the detail s difficulty of constructability As such a more easily constructed new standard design with one expansion joint and a sleeper slab was created Bridge Standard 12 and has been used more recently A review and analysis of Wisconsin approach slab performance was completed and other states practices were reviewed As a result of this work several conclusions and recommendations were made Several are listed below The expansion and contraction requirement does not warrant the use of multiple expansion and contraction joints as seen in SDD 13B2 SDD 13B2 is more highly susceptible to inadequacies within the approach supporting materials It is critical that the materials are prepared well and methods of preservation are built into the system for long term performance For Bridge Standard 12 it is recommended that the slab design is revisited to ensure it is properly sized and reinforced to act as a bridge between the sleeper slab and abutment paving notch in the event that settlement of the backfill and subbase occurs The

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=-1376585931 (2015-11-09)
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  • Permeability Performance and Lateral Load for Granular Backfill behind Abutments
    294 0467 Website www ctre iastate edu Copyright 1996 2009 Iowa State University All rights reserved Permeability Performance and Lateral Load for Granular Backfill behind Abutments Researcher s Principal investigators Pavana Vennapusa 515 294 2395 pavanv iastate edu Project status In progress Start date 08 13 13 End date 05 30 15 Sponsor s partner s Sponsor s Wisconsin Department of Transportation About the research Abstract The purpose of the granular backfill behind bridge abutments is to reduce the lateral earth pressure and eliminate the water pressure behind the abutments to use less reinforcement and apply a lower design lateral force on the abutment piles The current design uses a qualitative approach that assumes any water that infiltrates into the granular backfill will rapidly drain out of the system However other factors that affect lateral pressures including rate of water infiltration hydraulic properties of granular backfill and the short and long term effectiveness of the pipe underdrain challenge this assumption In addition hydraulic and mechanical characteristics of alternative granular materials for backfill such as recycled asphalt pavement RAP and foundry sand are not sufficiently characterized The objective of this research is to provide guidance and recommendations for design values used

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=1087079845 (2015-11-09)
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  • NCHRP Connection Details of Adjacent Precast Concrete Box Beam Bridges
    before or after transverse post tensioning prepackaged or non prepackaged grout materials post tensioned or non tensioned transverse ties a wide range of applied transverse post tensioning forces and cast in place concrete decks or no decks A few states reported that their methods had reduced the longitudinal cracking whereas others had not been successful using similar methods Research to evaluate those practices at the design and construction phases can lead to connection details that prevent cracking and leakage at the joints and extend the service life of the adjacent box beam bridges The objective of this research is to develop guidelines for the design and construction of connection details for adjacent precast concrete box beam bridges to eliminate cracking and leakage in the longitudinal joints between adjacent boxes The research will produce proposed design and construction specifications with commentary in the format of the American Association of State Highway and Transportation Officials AASHTO Load and Resistance Factor Design LRFD Bridge Specifications Accomplishment of the project objective will require at least the following tasks PHASE I Planning 1 Conduct a critical review of relevant specifications technical literature and owner and industry experiences The review should cover research findings from both domestic and foreign sources 2 Propose analytical and testing programs to investigate cracking in the longitudinal grouted joints between adjacent beams As a minimum the following factors should be considered i design methodology ii effect of span length iii bridge width iv skew angle v number and location both vertically and horizontally of transverse post tensioning ties vi differential camber vii optimum keyway shape and configuration viii keyway preparation ix keyway grout type and curing methods and x grouting and post tensioning sequence for two stage construction The testing program should cover the design of laboratory specimens to be tested

    Original URL path: http://www.ctre.iastate.edu/research/detail.cfm?projectID=407500380 (2015-11-09)
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