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Structural Concrete Overlays In Bridge Deck Rehabilitation
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Book Synopsis Structural Concrete Overlays in Bridge Deck Rehabilitation by : Frieder Seible
Download or read book Structural Concrete Overlays in Bridge Deck Rehabilitation written by Frieder Seible and published by . This book was released on 1989 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of experimental results, analytical studies and design recommendations -- Experimental program.
Book Synopsis Structural Concrete Overlays in Bridge Deck Rehabilitation by : Frieder Seible
Download or read book Structural Concrete Overlays in Bridge Deck Rehabilitation written by Frieder Seible and published by . This book was released on 1988 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Concrete Overlays in Bridge Deck Rehabilitation by :
Download or read book Structural Concrete Overlays in Bridge Deck Rehabilitation written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Concrete Overlays in Bridge Deck Rehabilitation ; Summary of Experimental Results, Analystical Studies and Design Recommendations by :
Download or read book Structural Concrete Overlays in Bridge Deck Rehabilitation ; Summary of Experimental Results, Analystical Studies and Design Recommendations written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Testing of an Ultra-high Performance Concrete Overlay by : Zachary B. Haber
Download or read book Field Testing of an Ultra-high Performance Concrete Overlay written by Zachary B. Haber and published by . This book was released on 2017 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge decks are commonly rehabilitated using overlays depending on the cause of deck deterioration, available budget, and desired service life of the rehabilitated structure. One emerging solution for bridge deck rehabilitation is thin, bonded ultra-high performance concrete (UHPC) overlays. As an overlay material, UHPC can provide both structural strengthening and protection from ingress of contaminates using a 1-in (25 mm) to 2-in (51 mm) layer of material. The first U.S. deployment of UHPC as a bridge deck overlay was completed in May 2016 on a reinforced concrete slab bridge located in Brandon. A few months after installing the UHPC overlay, a field inspection of the bridge identified some locations along the deck where delamination may have occurred. To address this concern, a field study was conducted in November 2016 to evaluate the bond between the UHPC overlay and the substrate concrete bridge deck. Researchers from the Federal Highway Administration’s (FHWA) Turner-Fairbank Highway Research Center (TFHRC) synthesized photographic evidence, conducted a field inspection of the bridge deck surface using a chain drag, and conducted physical testing of the UHPC-concrete interface bond using the direct tension bond pull-off test. Tested samples were taken back to TFHRC and the UHPC-concrete interface subsequently analyzed using scanning electron microscopy (SEM). The pull-off test data indicated that the UHPC overlay and the existing concrete bridge deck was intact, which was confirmed by SEM analysis.
Book Synopsis Rehabilitation and Strengthening of Rc Bridge Structures by :
Download or read book Rehabilitation and Strengthening of Rc Bridge Structures written by and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increased demands for higher legal loads and permit overloads on the nation's highway system necessitate the strengthening of a large number of existing short and medium span bridge structures. Frequently, the strengthening of bridge superstructures goes hand in hand with rehabilitation measures of the bridge deck and the road surface such as structural concrete overlays or widening measures to accommodate additional traffic lanes. As part of an ongoing research project with CalTrans, a 12 ft wide by 60 ft long section of an existing 25 year old cast-in-place concrete T-beam was brought to the Structural Systems Laboratory at the University of California, San Diego for full-scale investigation of different repair and strengthening measures. The repair and strengthening measures investigated were: 1) bridge deck rehabilitation by full depth structural concrete overlays; 2) repair of flexurally cracked bridge superstructures by epoxy injection; 3) strengthening by means of external post-tensioning tendons, and 4) addition of a thin high-strength prestressed bottom soffit panel to the bridge superstructure. Before and after the implementation of repair and strengthening measures, forced vibration tests as well as concentric and eccentric working load level tests were conducted in order to monitor the change in structural characteristics. A brief description of the implementation of each measure is provided together with experimental behavioural data and nonlinear analytical parameter studies. For the covering abstract of the Conference see IRRD Abstract no. 807839.
Book Synopsis Performance of Bridge Deck Concrete Overlays by : K. Babaei
Download or read book Performance of Bridge Deck Concrete Overlays written by K. Babaei and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper documents performance of twelve concrete bridge decks in Washington State that were rehabilitated and/or protected with latex-modified concrete and low-slump dense concrete overlays in order to prevent further deicing salt penetration and concrete deterioration caused by reinforcing steel corrosion. An evaluation is made of the factors that have affected the serviceability of those overlaid bridge decks, and recommendations are made based on that evaluation for the design and construction of concrete overlays in order to improve bridge deck performance and to extend bridge deck service life. The factors evaluated are overlay freeze-thaw scaling, surface wear and skid resistance, surface cracking, bond with the underlying deck, chloride and water intrusion, and finally the concrete overlay's ability to retard continued reinforcing steel corrosion and corresponding concrete deterioration.
Book Synopsis Assessment and Rehabilitation Strategies/guidelines to Maximize the Service Life of Concrete Structures by : Teresa M. Adams
Download or read book Assessment and Rehabilitation Strategies/guidelines to Maximize the Service Life of Concrete Structures written by Teresa M. Adams and published by . This book was released on 2002 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Bridge Protection and Rehabilitation by : Michael M. Sprinkel
Download or read book Concrete Bridge Protection and Rehabilitation written by Michael M. Sprinkel and published by Strategic Highway Research Program (Shrp). This book was released on 1993 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the rapid methods used by state highway agencies for the protection, repair and rehabilitation of bridge decks. The report is based on a review of the literature; the responses to questionnaires sent to state departments of transportation, Canadian provinces, selected turnpike and thruway authorities, technology transfer centers, and material suppliers; and the evaluation of 50 bridge decks located in seven states. Polymer overlays, sealers, high-early strength hydraulic cement concrete overlays, and patches are compared for their performance characteristics and service life.
Book Synopsis Performance of Bridge Deck Overlays in Virginia: Phase II: Service Life Performance by : Soundar S.G. Balakumaran
Download or read book Performance of Bridge Deck Overlays in Virginia: Phase II: Service Life Performance written by Soundar S.G. Balakumaran and published by . This book was released on 2019 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overlaying bridge decks has remained one of the best rehabilitation methods to extend their service life, and the Virginia Department of Transportation (VDOT) has been a leader in the use of bridge deck overlays. Although VDOT has extensive experience in overlays, the long-term performance of overlays has not been entirely understood. One of the biggest challenges for studying the performance of overlays is that only minimal information is available in bridge inventory and inspection records. This limits any scientific assessment of this system. Therefore, the purpose of this study was to provide a strong framework for the understanding of the long-term performance of overlays and the factors affecting them. This Phase II report reports on an extensive data collection process that led to the development of a robust database of 133 overlaid bridge decks after verification of historical inspection reports, verification of as-built plans and communication with VDOT district bridge engineers. This helped in developing a model for understanding the amount of time it takes for bridge decks to require the first major rehabilitation and the major factors influencing the durability. A database of information about overlays that were replaced at the end of their functional service life was compiled. This helped develop a multiple regression model for understanding the factors that affected the durability of overlays. Survival analyses were conducted to estimate the service life of overlays and corresponding risk. As a preventive method, epoxy concrete (EC) overlays were predicted to serve an average of 20.9 years, with 18 to 22 years at a 95 percent confidence level. As a rehabilitative method, rigid concrete overlays were predicted to serve an average of 25.9 years, with 21 to 32 years at a 95 percent confidence level. The recent trend of preferred overlay types has been identified as EC and very-early- strength latex-modified concrete (VELMC) overlays. EC overlays have proven to be one of the better performing overlays through extensive VDOT experience. VELMC overlays are an improvement upon latex-modified concrete overlays by vastly reducing the time of construction and thus become more suitable for decreased construction time, reduced traffic disruption, and lessened worker exposure to the field environment. An important discovery was the identification of the influence of the degree of deck damage prior to overlaying on the service life of overlays. Preventive EC overlays should be used in a preventive sense, as the name suggests. If preventive EC overlays are installed on bridge decks with spalls, patches, or delaminations, irrespective of the amount of damage, an increased rate of deterioration in the overlays is likely to follow. The future performance of rehabilitative overlays such as latex-modified concrete, silica fume, and VELMC overlays will not be influenced by the presence of bridge deck damage prior to overlaying. This might be because of the removal of deteriorated concrete before these rigid overlays are constructed. This emphasizes the importance of proper removal of poor quality concrete from bridge decks before overlaying during rehabilitation.
Book Synopsis Concrete Bridge Protection and Rehabilitation by : Richard E. Weyers
Download or read book Concrete Bridge Protection and Rehabilitation written by Richard E. Weyers and published by . This book was released on 1994 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a study on estimating the service life cycle of reinforced concrete bridge components exposed to chloride-laden environments. Current treatment options are identified and an opinion survey was used to obtain first estimates of service life. To estimate the service life of untreated and rehabilitated bridge decks, data from 52 bridge decks distributed in different environmental conditions were collected. Models estimating the service life of untreated and rehabilitated bridge decks were developed and compared with models developed based on historical data and the time-to-rehabilitate model.
Book Synopsis Bridge Deck Rehabilitation by : John E. Whiting
Download or read book Bridge Deck Rehabilitation written by John E. Whiting and published by . This book was released on 1989 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Iowa demonstration project to promote the rehabilitation of bridge deck concrete by rebonding delaminations with injected epoxy is a 150 ft x 150 ft high truss bridge on Iowa route No. 210 over Indian Creek near Maxwell in Story County (Service level D, AADT-730, Inventory Rating HS-16.9, Operating Rating HS-25). The objective of this study was to evaluate the effectiveness of repairing a delaminated bridge deck by epoxy injection, specifically a bridge deck with a delaminated portland cement concrete overlay.
Book Synopsis Long-term Performance of Polymer Concrete for Bridge Decks by : David W. Fowler
Download or read book Long-term Performance of Polymer Concrete for Bridge Decks written by David W. Fowler and published by Transportation Research Board. This book was released on 2011 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 423: Long-Term Performance of Polymer Concrete for Bridge Decks addresses a number of topics related to thin polymer overlays (TPOs). Those topics include previous research, specifications, and procedures on TPOs; performance of TPOs based on field applications; the primary factors that influence TPO performance; current construction guidelines for TPOs related to surface preparation, mixing and placement, consolidation, finishing, and curing; repair procedures; factors that influence the performance of overlays, including life-cycle cost, benefits and costs, bridge deck condition, service life extension, and performance; and successes and failures of TPOs, including reasons for both.
Book Synopsis Cracking in Fully Reinforced Bridge Deck Overlays and PCC Tapered Approach Slabs by : Carl F. Stewart
Download or read book Cracking in Fully Reinforced Bridge Deck Overlays and PCC Tapered Approach Slabs written by Carl F. Stewart and published by . This book was released on 1987 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1984, the California Department of Transportation started a new concept for rehabilitating deicing salt damaged bridge decks. It consists of placing a fully reinforced (epoxy coated), full depth deck overlay on the existing deck. The new deck is tied to the old with reinforcing steel dowels grouted in predrilled holes along girder centerlines. When the original approach is PCC, tapered PCC approaches are installed. The construction is usually done in stages, with traffic using one portion of the deck while an overlay is being placed on another. Inordinate cracking occurred in some of the first 20 concrete placements. This report documents the extent of cracking and covers possible causes for the cracking in both these and subsequent placements. It also discusses the role traffic, weather and construction practices may have had.
Book Synopsis Evaluation of Concrete Overlays for Bridge Applications by : Khossrow Babaei
Download or read book Evaluation of Concrete Overlays for Bridge Applications written by Khossrow Babaei and published by . This book was released on 1987 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bridge Deck Rehabilitation Using Cathodic Protection with a Low-slump Concrete Overlay by : Andrew D. Halverson
Download or read book Bridge Deck Rehabilitation Using Cathodic Protection with a Low-slump Concrete Overlay written by Andrew D. Halverson and published by . This book was released on 1985 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Conference on Cathodic Protection of Reinforced Concrete Bridge Decks, San Antonio, Texas, February 12-13, 1985 by :
Download or read book Proceedings of the Conference on Cathodic Protection of Reinforced Concrete Bridge Decks, San Antonio, Texas, February 12-13, 1985 written by and published by . This book was released on 1985 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference focused on the major problem facing highway and bridge engineers: deterioration of concrete bridge decks caused by corrosion of the reinforcing steel. The conference was aimed primarily at giving bridge owners and engineers an understanding of cathodic protection as the only means to stop corrosion on bridge decks.
