Download or read book Bridge Deck Inspection and Dowel Bar Detection written by Wooyoung Kim and published by . This book was released on 2003 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The present study is comprised of two separate GPR case studies on a bridge deck and a concrete pavement respectively. These typical concrete structures were investigated using GPR with several objectives: 1) to find the reason of discrepancies between GPR results and the results of the other tests through bridge deck inspection, 2) to investigate the bridge deck under various weather conditions, 3) to determine the relative spatial locations of the imbedded dowel bars in the new concrete pavement, and finally 4) to evaluate the present capabilities of GPR technology including survey scheme and analysis through these two case studies."--Abstract, p. iii.
Download or read book Inspection and Monitoring Techniques for Bridges and Civil Structures written by G Fu and published by Elsevier. This book was released on 2005-09-20 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: The safety, maintenance and repair of bridges and buildings depend on effective inspection and monitoring techniques. These methods need to be able to identify problems often hidden within structures before they become serious. This important collection reviews key techniques and their applications to bridges, buildings and other civil structures. The first group of chapters reviews ways of testing corrosion in concrete components. Given their continuing importance and vulnerability to decay, the next series of chapters describes ways of testing wood components within civil structures. A final group of chapters looks at visual and acoustic techniques and their use to assess bridges in particular. Inspection and monitoring techniques for bridges and civil structures is an invaluable reference for civil engineers involved in safety inspection, maintenance and repair of bridges and civil structures. Reviews key inspection and monitoring techniques and their applications to bridges, building and other civil structures Edited by a leading authority in the field
Download or read book A Case Study of Three Methods Used in Detecting Bridge Deck Deterioration Associated with Spalling written by Charles E. Smith and published by . This book was released on 1973 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three most widely used current methods for detecting deterioration of concrete bridge decks associated with spalling were compared with a visual inspection of the reinforcing steel and to each other in order to determine the degree of agreement among the methods. The three methods are known as the Chain Drag Method, Measurement of Corrosion Potentials, and the Hammer Method. On a bridge scheduled for deck replacement, each of the methods was used to designate the areas of deck to be removed and the results were compared with the findings of a visual inspection of the rebar. It was concluded that the three techniques were practical and effective. However, in order to ensure that a high percentage of deteriorated areas are located, two of the detection methods should be used and the areas indicated by both methods should be removed.
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.
Download or read book Detection of Steel Corrosion in Bridge Decks and Reinforced Concrete Pavement written by Vernon J. Marks and published by . This book was released on 1977 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Iowa Department of Transportation initiated this research to evaluate the realiability, benefit and application of the corrosion detection device. Through field testing prior to repair projects and inspection at the time of repair, the device was shown to be reliable. With the reliability established, twelve additional devices were purchased so that this evaluation procedure could be used routinely on all repair projects. The corrosion detection device was established as a means for determining concrete removal for repair. Removal of the concrete down to the top reinforcing steel is required for all areas exhibiting electrical potentials greater than 0.45 Volt. It was determined that the corrosion detection device was not applicable to membrane testing. The corrosion detection device has been used to evaluate corrosion of reinforcing steel in continuously reinforced concrete pavement.
Download or read book Inspection of Timber Bridge Longitudinal Decks with Ground Penetrating Radar written by Brian K. Brashaw and published by . This book was released on 2014 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced nondestructive inspection techniques like stress wave timing and resistance microdrilling have been used to successfully inspection timber bridges, but it is most effective on girder style bridges. There is a noted need to develop additional inspection techniques for longitudinal deck/slab timber bridges, which comprise about 20% of the national bridge inventory. One technique that holds potential is ground penetrating radar, a recognized nondestructive testing technique that has been used effectively for many different environmental and transportation applications. It has been utilized successfully to identify buried objects, internal defects and material changes. The objective of this research was to assess the potential for using GPR to identify and assess simulated deterioration in longitudinal timber deck timber bridges. GPR scans were completed in the longitudinal and transverse directions of a screw laminated timber bridge deck before and after a bituminous layer was added to assess embedded defects that simulated voids, decay, insect damage and horizontal shear splitting. Assessment of the GPR wave energy signal was completed using visualization software that was provided with the commercial GPR unit used for the testing. The radar signal was analyzed in both the longitudinal direction (antenna front to back) and the transverse direction (antenna side to side). Interpretation of the radar signals allowed for the identification of various internal defects present in the deck. Based on the results, GPR has the potential to identify internal defects in timber bridge decks before and after a bituminous layer was added. Large, rectangular void defects (at least 6‐ by 12‐ by 5 in. (15.2‐ by 30.4‐ by 12.7 cm)) that were hollow, filled with foam, or filled with sawdust/adhesive were most easily identified under all scanning conditions. The addition of a bituminous layer, common to slab bridge construction, damped the signal response and made it more difficult to identify defects. Several smaller defects that were found in the deck without a bituminous layer were not identified in scanning completed after the bituminous layer was added.
Download or read book Detection of Bridge Deck Deterioration written by William Michael Moore and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automatic Delamination Detection of Concrete Bridge Decks Using Acoustic Signatures written by Gang Zhang and published by . This book was released on 2010 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Bridge Deck Delamination Investigation Methods written by Henrique L. M. dos Reis and published by . This book was released on 1998 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: An objective view of the relative advantages and limitations of the nondestructive testing and evaluation methods that are currently used in the inspection of bridge decks is presented and discussed. The three main nondestructive testing technologies that were evaluated are impact-echo, ground penetrating radar, and infrared thermography. Nondestructive testing and evaluation procedures, including methodology and equipment to evaluate concrete bridge decks with asphalt overlays, are also presented and discussed. Current results indicate that a combination of ground penetrating radar and infrared thermography would provide the best methodology for evaluating the structural integrity, e.g., delaminations, of concrete bridge decks with overlays. Furthermore, current results also indicate that the impact-echo method shows promising future development towards the nondestructive evaluation of bridge superstructures.
Download or read book The Detection of Common Concrete Bridge Deck Defects Using Thermography Impact Echo and Ground Penetrating Radar written by Saleh Z. Nabulsi and published by . This book was released on 2005 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bridge Deck Delamination Study Infrared Inspection for Iowa Department of Transportation Highway Division and Iowa Highway Research Board written by and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the week of June 14, 1982, Donohue & Associates, Inc. performed an infrared thermographic scan of 19 bridges and 1 section of continuously reinforced concrete pavement. The bridges and pavement were located throughout the northwest quarter and central portion of. Iowa. The scanning was undertaken under various environmental conditions to evaluate the technique under typical conditions. During the data collection phase surface temperatures were measured with a digital contact thermometer. Temperature measurements were taken in delaminated and solid areas. The ability to detect delaminations accurately is dependent upon the temperature differential between the solid and delaminated pavement. The larger the temperature differential the easier it will be detected by the infrared scanner. The temperature differential is dependent upon the depth of the delamination, amount of separation at the delamination, and environmental conditions. The environmental conditions under which the data was collected is summarized on Table 2 along with the temperature differentials between the solid and delaminated pavement. The environmental conditions varied on each of the five days that data was collected. These conditions together with the range of temperature differentials are shown in Table 3.
Download or read book Bridge Optimization written by Yun Lai Zhou and published by BoD – Books on Demand. This book was released on 2020-02-05 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of several applications for condition monitoring and damage identification in bridge structures. Bridge structural condition monitoring is essential since it can provide early warning of potential defects in bridges, which may induce catastrophic accidents and result in huge economic loss. Such bridge condition monitoring relies on sensing techniques, especially advanced sensing techniques that can provide detailed information on bridge structures. Additionally, postprocessing systems can interpret the captured data and warn of any potential faults. This book will give students a thorough understanding of bridge condition monitoring.
Download or read book Detection of Sub surface Anomalies in Concrete Bridge Decks Using Ground Penetrating Radar written by Vasudev A. Bhandarkar and published by . This book was released on 1993 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bridge Deck Inspection Utilizing Infrared Thermal Imaging Technique written by Sharef Farrag and published by . This book was released on 2014 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Infrared Thermography (IRT) is a promising Non-destructive Evaluation (NDE) technique that has been widely used in bridge deck inspection. It is a quick and easy alternative to provide preliminary information of possible defected areas in bridge decks. However, detection capabilities and sensitivity to environmental conditions and material properties impose some challenges for the application of IRT. In this study, the effect of varying concrete mixtures on passive IRT was investigated. Four different concrete mixtures, conventional, high-strength, self-consolidated and lightweight concrete, were included in the evaluation. Various defects with relatively small sizes and depths were simulated and planted in cast-in-place slabs. The casting and testing took place in the United Arab Emirates (UAE), which is considered a hot weather region. The defected specimens were imaged, and the images were compared to non-defected specimens to enhance the judgment on defect detection. Thermal conductivity of each mix was estimated using the Maxwell- Eucken 2-phase composite material model, and Rapid Chloride Penetration was tested and used as an indication of density. The slabs were imaged during the cooling cycle. Results indicated that mix variation had a significant effect on IRT. High strength concrete achieved the highest detection possibility among the mixes. Furthermore, results showed that the higher the density and thermal conductivity coefficient, the better the defect detection using IRT at ideal imaging conditions is. For the UAE, ambient conditions are favorable for passive IRT, as the results indicated minimal sensitivity to wind, relative humidity, and temperature as opposed to other locations in the world where passive IRT would not be applicable. Nevertheless, because of IRT limitations, it would be better employed as a health monitoring technique with baseline comparisons rather than an independent primary inspection NDT tool for bridges."--Abstract.
Download or read book Automated Impact Response Sounding for Accelerated Concrete Bridge Deck Inspection written by Jacob Lynn Larsen and published by . This book was released on 2018 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrastructure deterioration is an international problem requiring significant attention. One particular manifestation of this deterioration is the occurrence of sub-surface cracking (delaminations) in reinforced concrete bridge decks. Of many techniques available for inspection, air-coupled impact-echo testing, or sounding, is a non-destructive evaluation technique to determine the presence and location of delaminations based upon the acoustic response of a bridge deck when struck by an impactor. In this work, two automated air-coupled impact echo sounding devices were designed and constructed. Each device included fast and repeatable impactors, moving platforms for traveling across a bridge deck, microphones for air-coupled sensing, distance measurement instruments for keeping track of impact locations, and signal processing modules. First, a single-channel automated sounding device was constructed, followed by a multi channel system that was designed and built from the findings of the single-channel apparatus. The multi channel device performed a delamination inspection in the same manner as the single-channel device but could complete an inspection of an entire traffic lane in one pass. Each device was tested on at least one concrete bridge deck and the delamination maps produced by the devices were compared with maps generated from a traditional chain-drag sounding inspection. The comparison between the two inspection approaches yielded high correlations for bridge deck delamination percentages. Testing with the two devices was more than seven and thirty times faster, respectively, than typical manual sounding procedures. This work demonstrates a technological advance in which sounding can be performed in a manner that makes complete bridge deck scanning for delaminations rapid, safe, and practical.
Download or read book Rapid Non destructive Delamination Detection written by Richard P. Joyce and published by . This book was released on 1986 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delaminations in concrete bridge decks are a major cause of bridge maintenance problems. Sonic inspection techniques are currently being used for condition surveys to identify those bridge decks on which expenditures of funds are both necessary and cost effective. While the current sonic methods are reliable, they are too slow for the survey application. A need exists for a rapid, non-destructive method for assessing the general condition of the bridge decks without closing the deck to traffic. The inspection techniques considered for use were infrared thermography, electro-magnetic sounding, nuclear radiation and acoustic techniques. Electromagnetic sounding, by using pulsed radar, has the best potential for use in the development of a rapid survey system.
Download or read book Condition Assessment of Concrete Bridge Decks Using Ground Penetrating Radar written by Kien Dinh and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
