Download or read book Performance of Bridge Deck Overlays in Virginia Phase I State of Overlays written by Soundar S. G. Balakumaran and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maintaining the existing transportation infrastructure is a major concern of the Virginia Department of Transportation (VDOT). The increased user travel costs, safety concerns, and financial burdens involved in replacing deteriorating decks are reasons for finding appropriate rehabilitation actions that can safely extend the service life of structures. Virginia has been a leader in employing overlays as a rehabilitation method for bridge decks. VDOT's Manual of the Structure and Bridge Division contains guidance for the decision-making process related to maintenance and repair of structures. Yet there is a need to update the guidelines based on contemporary experience and the knowledge gained through technological advances. This report presents and discusses the preliminary findings of Phase I of a multi-phase study to determine the performance of bridge deck overlays in Virginia. Phase I focused on obtaining information regarding the experiences of VDOT's nine districts with regard to their use of different kinds of overlays and the factors that influence which overlays are used. In addition, VDOT's bridge inventory was analyzed to gain an understanding of the types of overlay systems used in Virginia. The overlay types identified to be the most commonly used by the nine VDOT districts were latex-modified concrete, epoxy concrete, silica fume concrete, very-early-strength latex-modified concrete, and hot-mix asphalt concrete with a water-resistant membrane. From interviews, wide ranges in service life, even for the same overlay type, were found in every VDOT district. The performance of overlays, irrespective of the type, was highly dependent on the construction workmanship and the attention paid to the crucial details. Another commonly observed influential factor was the degree of deck damage (i.e., deterioration) that existed when the overlay was installed; the higher the pre-overlay deck damage, the worse the performance of the overlay. The study recommends that a Phase II study be conducted that will involve an investigation of the overlays for bridges in VDOT's bridge inventory, including a review of inspection reports and a field survey of a selected number of bridge decks. The study further recommends that factors identified in the Phase I study, such as age of overlays, traffic volume, and salt usage, be taken into account when the bridges are selected. The results will support appropriate modifications to the bridge maintenance guidelines as they pertain to deck overlays in VDOT's Manual of the Structure and Bridge Division.

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.

Download or read book Latex Modified Concrete Bridge Deck Overlays field Performance Analysis Main report written by Alfred G. Bishara and published by . This book was released on 1979 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Roadway and Bridge Life Cycle Assessment 2020 written by John Harvey and published by CRC Press. This book was released on 2020-07-02 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: An increasing number of agencies, academic institutes, and governmental and industrial bodies are embracing the principles of sustainability in managing their activities. Life Cycle Assessment (LCA) is an approach developed to provide decision support regarding the environmental impact of industrial processes and products. LCA is a field with ongoing research, development and improvement and is being implemented world-wide, particularly in the areas of pavement, roadways and bridges. Pavement, Roadway, and Bridge Life Cycle Assessment 2020 contains the contributions to the International Symposium on Pavement, Roadway, and Bridge Life Cycle Assessment 2020 (Davis, CA, USA, June 3-6, 2020) covering research and practical issues related to pavement, roadway and bridge LCA, including data and tools, asset management, environmental product declarations, procurement, planning, vehicle interaction, and impact of materials, structure, and construction. Pavement, Roadway, and Bridge Life Cycle Assessment 2020 will be of interest to researchers, professionals, and policymakers in academia, industry, and government who are interested in the sustainability of pavements, roadways and bridges.

Download or read book Concrete Overlays for Bridge Decks in West Virginia written by Julio F. Davalos and published by . This book was released on 2011 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of concrete bridge deck overlays written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of Concrete Bridge Deck Overlays written by Chris Anderson and published by . This book was released on 1990 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chloride-ions penetrating into bridge decks and corroding the steel have been a major problem. As the steel corrodes it exerts stresses on the surrounding concrete. When the stresses exceed the strength of the concrete, cracks or delaminations occur. This, of course, causes deterioration and spalling of bridge deck surfaces. Both the Latex and Iowa Method were used to repair bridge decks for this project. The concrete was removed down to the steel and replaced with approximately 1 1/2 inches of low slump or latex modified concrete. The removal of unsound concrete below the top layer of steel was sometimes necessary. The objective of this project was to determine if the bridge overlays would provide a cost effective method of rehabilitation. To do this, unsound and delaminated concrete was removed and replaced by an overlay of low slump or latex modified concrete.

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.

Download or read book First Year Performance of Microsilica Concrete Bridge Deck Overlays written by and published by . This book was released on 1991 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field Performance of Latex modified and Low slump Dense Concrete Bridge Deck Overlays in the United States written by W. P. Chamberlin and published by . This book was released on 1994 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bridge Deck Performance in Virginia written by James Davis and published by . This book was released on 1971 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most comprehensive programs for the evaluation and definition of the performance of concrete in bridge decks was that undertaken cooperatively by the Portland Cement Association, the Bureau of Public Roads, and eight states distributed throughout the United States. Detailed studies of a few bridges were made in four states and surveys were made on from 100 to 150 bridges in each of eight states, including Virginia, and these were reported. The Research Council's special study of the bridge deck concrete included observation of construction and sampling on 17 structures distributed throughout the state with the exception of the easternmost (Suffolk) and westernmost (Bristol) highway construction districts. These decks were constructed during the spring and summer of 1963 under specifications, subsequently upgraded, that were adjudged to produce concrete of "borderline" performance in bridge decks. These decks had been under traffic for six winters. Because of the similarity of the objectives of the two studies it was deemed desirable to include during the survey of the 17 bridges of the Research Council's project a resurvey of the structures included in the PCA-BPR survey last inspected in 1961.

Download or read book Latex Modified Concrete Bridge Deck Overlays written by Bishara, Alfred G. and published by . This book was released on 1979 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of the Installation and Initial Condition of High Performance Concrete Overlays Placed on Route 60 Over Lynnhaven Inlet in Virginia written by Michael M. Sprinkel and published by . This book was released on 1999 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sixteen high performance concrete overlays were placed on two 28-span bridges on Rte. 60 over Lynnhaven Inlet, Virginia Beach, Virginia, in the spring of 1996. The construction was funded with 20 percent Virginia Department of Transportation maintenance funds and 80 percent special ISTEA Section 6005 federal funds specifically allocated to demonstrate overlay technologies. ISTEA funds were also used to evaluate the installation and initial condition of the overlays and to prepare this report. The installation included 13 different concrete mixtures, an overlay with a thickness of only 19 mm (0.75 in), and spans with and without topical treatments of two corrosion inhibitors, for a total of 16 different overlays. The overlay types are 7% silica fume (SF), 5% SF and 35% slag (S), 5% SF and 15% class F fly ash (FA), 15% latex-modified concrete (LMC), 13% SF and 15% FA, 13% SF and 15% FA placed 19 mm thick, 7% SF and Rheocrete corrosion inhibiting admixture (CIA) (RCI), 7% SF and Armatec CIA (ACI) and ACI topical treatment (A), 7% SF and ACI, 7% SF and Darex CIA (DCI) and Postrite (P) topical treatment, 7% SF and DCI, 40% S, 7% SF and shrinkage reducing admixture (CQI), 7% SF and polyolefin fibers (POF), 7% SF and steel fibers (STF), and 7% SF and polypropylene fibers (PPF). With the exception of system F, overlays were required to have a minimum thickness of 32 mm. Also, system E had a variable thickness that ranged from 32 mm to 19 mm to provide good ride quality.

Download or read book Evaluation of the Construction and Performance of Polymer Concrete Overlays on Five Bridges written by Michael M. Sprinkel and published by . This book was released on 1983 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: The installation of thin polymer concrete overlays on five bridges on I-85 near Williamsburg, Virginia, has demonstrated that an overlay of low permeability and high skid resistance can be successfully installed by a contractor with a minimum of disruption to traffic of approximately eight hours per lane. The initial condition of the overlays was excellent from the standpoint of permeability, skid resistance, and bond, although some overlays were better than others. All were in good to excellent condition after one year in service, but the permeability had increased and the bond strength and skid resistance had decreased significantly. Based on the data collected during the first year it is projected that the overlays constructed with LB183 resin will have a useful service life of at least five years and that the MMA overlay will fail in less time.

Download or read book Protective Coatings for Concrete Bridge Decks written by Richard J. Irwin and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Performance of protective coatings for bridge decks is evaluated. Applications to bridges on the New York State highway system from 1961 through 1967 included 1) surface overlays, 2) membranes between the structural slab and bituminous wearing course, and 3) surface sealants. Overlays and membranes consisted of epoxies, polyesters, polyurethanes, latexes, neoprenes, silicone rubbers, and asphalt cutbacks. Surface sealants included silicones, distillate oils, and linseed oil. None of the surface overlays lasted more than 2 to 3 yr. However, a flexible polyester resin with fiber glass has provided satisfactory service for 1-1/2 yr and will remain under observation. Leakage of box-girder bridges with a membrane was primarily due to shear-key construction (since modified), while the same materials applied to composite bridges were associated with leakage that could not be explained. A more comprehensive survey of membranes is planned. Silicone and distillate oil sealants on non-air-entrained concrete did not improve long-term durability. Air-entrained concrete, both with and without linseed oil treatment, showed no evidence of deterioration after 4 yr of exposure.

Download or read book Concrete Bridge Deck Performance written by H. G. Russell and published by Transportation Research Board. This book was released on 2004 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

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.