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Investigating Causes And Determine Repair Needs To Mitigate Falling Concrete From Bridge Decks
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Book Synopsis Investigating Causes and Determine Repair Needs to Mitigate Falling Concrete from Bridge Decks by : Nabil F. Grace
Download or read book Investigating Causes and Determine Repair Needs to Mitigate Falling Concrete from Bridge Decks written by Nabil F. Grace and published by . This book was released on 2012 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study developed a procedure to identify concrete bridge decks that are exhibiting the characteristics associated with falling concrete. Field exploratory work on reinforced concrete bridge decks was supported by analytical and laboratory investigations. The field work included visual inspection, non-destructive tests, and sampling of full-depth cores and powder samples from the bottom of the bridge deck. Chief variables assessed were the chance of corrosion by the half-cell potential, chloride content at the location of the bottom reinforcement, and the concrete pH level. The chloride diffusivity was estimated from the chloride profile. The laboratory investigation was performed on bridge deck beams. The beams were constructed from concrete containing chloride levels known to cause corrosion as well as from a control concrete. Beams were subjected to freeze-thaw or saltwater followed by repeated loading to simulate field conditions. The following characteristics were quantified: chance of corrosion, corrosion rate, chloride content, flexural response as a function of environmental exposure and repeated loads, and ultimate strength. The size of the porous zone around the reinforcement was determined using an environmental scanning electron microscope. Finally, a strategy was developed to assess if a bridge deck exhibited the characteristics associated with falling concrete. The strategy included visual inspection of cracking and spalling, assessment of chance of corrosion, chloride content, and pH levels. If any of these measures exceed critical levels a service life calculation needs to be performed. Based on existing mathematical models, the time to corrosion initiation and time to corrosion cracking can be predicted. The resulting time is then compared to the age of the bridge. From this information proper planning for future repair needs can be made.
Book Synopsis Preliminary Investigation of the Systematic Approach to the Repair Versus Replacement Decision-Making Process for Deteriorated Concrete Bridge Decks by : Charles William Protasio
Download or read book Preliminary Investigation of the Systematic Approach to the Repair Versus Replacement Decision-Making Process for Deteriorated Concrete Bridge Decks written by Charles William Protasio and published by . This book was released on 1986 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete bridge deck deterioration, especially premature deterioration, is a major problem for the state transportation agencies throughout the United States. Moreover, this deck deterioration, which manifests itself in the form of cracking, scaling and spalling, accounts for a large portion of the number of the nation's structurally deficient bridges. In particular, the New England states have expressed concern over the dilemma of repair versus replacement strategies for those decks on the grey zone (deck condition code 4-6). Thus, the purpose of this thesis is to provide a preliminary investigation into the systematic approach to the repair versus replacement decision-making process for deteriorated concrete decks. For a large number of states, the existing decision-making process is characterized by a piecemeal synthesis oriented towards emphasizing the advantages of one repair or replacement alternative and underestimating its disadvantages. An actual cost-effective comparison of all possible alternatives is not routinely undertaken.
Book Synopsis Field Investigation of Spalling in Bridge Decks with Partial-depth Precast Concrete Panel Systems Using Non-destructive Testing by : Kandi Rebecca Wieberg
Download or read book Field Investigation of Spalling in Bridge Decks with Partial-depth Precast Concrete Panel Systems Using Non-destructive Testing written by Kandi Rebecca Wieberg and published by . This book was released on 2010 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study involved the investigation of the causes of spalling observed in several partial-depth precast prestressed bridge decks in the state of Missouri. Recently it has been observed that several bridges in Missouri with this type of construction have experienced spalling of concrete at the edges of the panels revealing an extreme condition of corrosion in the prestressing tendons, some to the point of rupture. Ground penetrating radar (GPR), which has been shown to be successful in bridge deck evaluation, was used to determine the relative condition of the prestressing tendons as well as the relative condition of the concrete throughout the deck in order to identify areas of cracking and corrosion. Particular techniques were used in an attempt to identify areas of delamination at the interface between the precast panels and cast-in-place topping slab, namely the acquisition of data from both the top and bottom deck surfaces as well as specialized data interpretation techniques. Core control and visual inspection were utilized to interpret and validate the GPR data. Half-cell, resistivity and rebound hammer testing was performed on bridge deck panels to determine the corrosion levels of the prestressing strands and material properties of the panels. Findings indicate that spalling in the PPC panels is the result of the penetration of water and chlorides through the reflective cracking in the CIP topping, to the interface between the CIP topping and the PPC panels, then through the PPC panels to the prestressing tendons located near the panel joints. Increased crack control in the CIP topping delays the onset of spalling at the panel joints. Most deterioration is occurring near the area of reflective cracking in the CIP topping and not in the area of concrete over the middle of the panels. Some delamination is occurring at the CIP topping and panel interface"--Abstract, leaf iii.
Book Synopsis Control and Repair of Bridge Deck Cracking by : Robert J. Frosch
Download or read book Control and Repair of Bridge Deck Cracking written by Robert J. Frosch and published by . This book was released on 2010-11-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessment of the Cracking Problem in Newly Constructed Bridge Decks in Colorado by : Yunping Xi
Download or read book Assessment of the Cracking Problem in Newly Constructed Bridge Decks in Colorado written by Yunping Xi and published by . This book was released on 2003 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early age cracking on concrete bridge decks has been experienced by many state departments of transportation (DOTs). In Colorado the cracking problem on newly constructed bridge decks has not been completely solved. In this study, the extent and causes of the cracking problem were investigated, and necessary changes to alleviate the cracking problem were identified. To achieve these goals, current Colorado Department of Transportation (CDOT) practice was reviewed and compared with other DOTs practices for construction of bridge decks. A database analysis of field inspection results was performed.
Book Synopsis Bridge Deck Repair Investigation and Quantity Estimation by : Yail J. Kim
Download or read book Bridge Deck Repair Investigation and Quantity Estimation written by Yail J. Kim and published by . This book was released on 2020 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a case study on the evaluation of bridge decks using various non-destructive test methods. The primary interest lies in quantifying delaminated areas in deck concrete covered with asphalt overlays. Analytical and computational models are formulated to decompose the intensity of GPR scales into two categories: i) initiation and progression of corrosion and ii) delamination of deck concrete, which show good agreement with repaired areas. Parametric investigations emphasize the significance of rebar spacing and concrete cover in determining the extent of deck delamination.
Author :United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight Publisher : ISBN 13 : Total Pages :894 pages Book Rating :4.3/5 (121 download)
Book Synopsis Flexible Funding and Planning Provisions of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) by : United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight
Download or read book Flexible Funding and Planning Provisions of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) written by United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight and published by . This book was released on 1995 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt: Distributed to some depository libraries in microfiche.
Book Synopsis Deterioration Prediction Modeling for the Condition Assessment of Concrete Bridge Decks by : Aqeed Mohsin Chyad
Download or read book Deterioration Prediction Modeling for the Condition Assessment of Concrete Bridge Decks written by Aqeed Mohsin Chyad and published by . This book was released on 2018 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges are key elements in the US transportation system. There are more than six hundred thousand bridges on the highway system in the United States. Approximately one third of these bridges are in need of maintenance and will cost more than $120 billion to rehabilitate or repair. Several factors affect the performance of bridges over their life spans. Identifying these factors and accurately assessing the condition of bridges are critical in the development of an effective maintenance program. While there are several methods available for condition assessment, selecting the best technique remains a challenge. Therefore, developing an accurate and reliable model for concrete bridge deck deterioration is a key step towards improving the overall bridge condition assessment process. Consequently, the main goal of this dissertation is to develop an improved bridge deck deterioration prediction model that is based on the National Bridge Inventory (NBI) database. To achieve the goal, deterministic and stochastic approaches have been investigated to model the condition of bridge decks. While the literatures have typically proposed the Markov chain method as the best technique for the condition assessment of bridges, this dissertation reveals that some probability distribution functions, such as Lognormal and Weibull, could be better prediction models for concrete bridge decks under certain condition ratings. A new universal framework for optimizing the performance of prediction of concrete bridge deck condition was developed for this study. The framework is based on a nonlinear regression model that combines the Markov chain method with a state-specific probability distribution function. In this dissertation, it was observed that on average, bridge decks could stay much longer in their condition ratings than the typical 2-year inspection interval, suggesting that inspection schedules might be extended beyond 2 years for bridges in certain condition rating ranges. The results also showed that the best statistical model varied from one state to another and there was no universal statistical prediction model that can be developed for all states. The new framework was implemented on Michigan data and demonstrated that the prediction error in the combined model was less than each of the two models (i.e. Markov and Lognormal). The results also showed that average daily traffic, age, deck area, structure type, skew angle, and environmental factors have significant impact on the deterioration of concrete bridge decks. The contributions of the work presented in this dissertation include: 1) the identification of the significant factors that impact concrete bridge deck deterioration; 2) the development of a universal deterioration prediction framework that can be uniquely tailored for each state’s data; and 3) supporting the possibility of extending inspection schedules beyond the typical 2-year cycles. Future work may involve: 1) evaluating each of the factors that impact the deterioration rates in more depth by refining the investigation ranges; 2) investigating the possibility of revising the regular bridge deck inspection intervals beyond the 2-year cycles; and 3) developing deterioration prediction models for other bridge elements (i.e. superstructure and substructure) using the framework developed in this dissertation.
Book Synopsis Cathodic Protection for Reinforced Concrete Bridge Decks by : John B. Vrable
Download or read book Cathodic Protection for Reinforced Concrete Bridge Decks written by John B. Vrable and published by Transportation Research Board National Research. This book was released on 1977 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bridge Inspection and Rehabilitation by : Parsons Brinckerhoff
Download or read book Bridge Inspection and Rehabilitation written by Parsons Brinckerhoff and published by John Wiley & Sons. This book was released on 1993-01-12 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than a third of America's bridges are considered substandard--either structurally deficient, functionally obsolete or both. Offers first-rate, practical guidance regarding the inspection and rehabilitation of aging bridge infrastructure including all elements involving structure, various materials and design types. Features seismic retrofit and coverage of environmental issues. Each chapter is written by an authority on the subject. Contains top-quality, detailed line illustrations plus photographs of actual rehab projects.
Book Synopsis Engineering and Design by : Us Army Corps Of Engineers
Download or read book Engineering and Design written by Us Army Corps Of Engineers and published by Military Bookshop. This book was released on 1995-06 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual provides guidance on evaluating the condition of the concrete in a structure, relating the condition of the concrete to the underlying cause or causes of that condition, selecting an appropriate repair material and method for any deficiency found, and using the selected materials and methods to repair or rehabilitate the structure. Guidance is also included on maintenance of concrete and on preparation of concrete investigation reports for repair and rehabilitation projects. Considerations for certain specialized types of rehabilitation projects are also given.
Author :National Research Council (U.S.). Transportation Research Board Publisher :Transportation Research Board National Research ISBN 13 : Total Pages :80 pages Book Rating :4.0/5 ( download)
Book Synopsis Durability of Concrete Bridge Decks by : National Research Council (U.S.). Transportation Research Board
Download or read book Durability of Concrete Bridge Decks written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1979 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This synthesis will be of special interest and usefulness to bridge engineers and others seeking information on design, construction, and maintenance of bridge decks. Detailed information is presented on the causes, prevention, evaluation, and rehabilitation of deck deterioration related to corrosion of steel reinforcement."--Avant-propos.
Author :United States. Congress. House. Committee on Ways and Means. Subcommittee on Oversight Publisher : ISBN 13 : Total Pages :574 pages Book Rating :4.0/5 ( download)
Book Synopsis Impact of Truck Overloads on the Highway Trust Fund by : United States. Congress. House. Committee on Ways and Means. Subcommittee on Oversight
Download or read book Impact of Truck Overloads on the Highway Trust Fund written by United States. Congress. House. Committee on Ways and Means. Subcommittee on Oversight and published by . This book was released on 1980 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Report on Investigation of Levees, Bank Revetment, Dams, Etc by : R. M. Elder
Download or read book Report on Investigation of Levees, Bank Revetment, Dams, Etc written by R. M. Elder and published by . This book was released on 1918 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Traffic-induced Vibrations on Bridge-deck Repairs by : David G. Manning
Download or read book Effects of Traffic-induced Vibrations on Bridge-deck Repairs written by David G. Manning and published by Transportation Research Board National Research. This book was released on 1981 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This synthesis will be of special interest to engineers concerned with placements of concrete for construction or repair of bridge decks. Recommendations are provided for restoring, patching, and widening bridge decks in the presence of traffic."--Avant-propos.
Author :United States. Congress. House. Committee on Ways and Means. Subcommittee on Oversight Publisher : ISBN 13 : Total Pages :576 pages Book Rating :4.:/5 (31 download)
Book Synopsis Impact of Truck Overloads on the Highway Trust Fund, Volume II by : United States. Congress. House. Committee on Ways and Means. Subcommittee on Oversight
Download or read book Impact of Truck Overloads on the Highway Trust Fund, Volume II written by United States. Congress. House. Committee on Ways and Means. Subcommittee on Oversight and published by . This book was released on 1980 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Highway Practice by : National Cooperative Highway Research Program
Download or read book Synthesis of Highway Practice written by National Cooperative Highway Research Program and published by . This book was released on 1981 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
