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Author : Kien Dinh
Release : 2014
Genre :
Kind : eBook
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Book Synopsis Condition Assessment of Concrete Bridge Decks Using Ground Penetrating Radar by : Kien Dinh
Download or read book Condition Assessment of Concrete Bridge Decks Using Ground Penetrating Radar written by Kien Dinh. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Adam J. Sketchley
Release : 2014
Genre :
Kind : eBook
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Book Synopsis Condition Assessment of Reinforced Concrete Bridge Decks as Conductive Media Using GPR by : Adam J. Sketchley
Download or read book Condition Assessment of Reinforced Concrete Bridge Decks as Conductive Media Using GPR written by Adam J. Sketchley. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT Cont.'d : Finally, determined conductivities were compared to chloride contents measured from cores taken from each deck at the time of testing. Conductivity was shown to increase linearly with chloride content, confirming the ability of ground penetrating radar to detect chlorides. This relationship can be used to map chloride content across a bridge deck and estimate the time to corrosion, greatly increasing the efficiency of bridge deck inspection.
Author : Daniel E. Diaz
Release : 2018
Genre :
Kind : eBook
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Book Synopsis Ground Penetrating Radar for Concrete Bridge Deck Evaluation by : Daniel E. Diaz
Download or read book Ground Penetrating Radar for Concrete Bridge Deck Evaluation written by Daniel E. Diaz. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: As the nation's infrastructure continues to age, there is a need to effectively and economically monitor and inspect bridges. With the introduction of non-destructive testing technologies such as Ground Penetrating Radar (GPR) for condition assessment of bridge decks, states will be better equipped to inspect, assess, and prioritize transportation funding to maintain, preserve, and improve infrastructure. The objective of the research is to improve the condition assessment of bridge decks through the use of GPR which can increase the speed, effectiveness, and accuracy of inspections. The non-destructive evaluation technique provides information that can be used to identify the potential amount of internal deterioration of a concrete bridge deck that cannot be identified with a visual inspection. As in many other states, New Mexico currently uses the chain drag method in which the inspection of the deck condition is solely based on inspector's subjective interpretation of the sound produced by dragging a chain over the bridge deck. The use of GPR has the potential to greatly improve the quality of the inspections by collecting more reliable and less subjective information on the condition of bridge decks. Through the collection and analysis of data acquired from the GPR on a set of reinforced concrete decks, this research seeks to provide a better understanding of GPR technology, data acquisition, and training needs for adoption of GPR in bridge deck inspections in the state of New Mexico. With a better understanding of the technology, GPR can become and indispensable tool for more informed decisions for the allocation of funds for maintenance and improved asset management. This research improves implementation and provides effective economic methods to employ this technology to improve the inspection and maintenance of bridge infrastructure.
Author :
Release : 2016
Genre : Concrete
Kind : eBook
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Book Synopsis LTBP News by :
Download or read book LTBP News written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: Assessing the condition of bridge deck surfaces using ground penetrating radar (GPR), using electromagnetic pulses to text, characterize, or detect subsurface anomalies.
Author : Amos Wamweya
Release : 2009
Genre : Bridges
Kind : eBook
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Book Synopsis Application of Ground Penetrating Radar (GPR) for Bridge Deck Condition Assessment: Using a 1.5 GHz Ground-coupled Antenna by : Amos Wamweya
Download or read book Application of Ground Penetrating Radar (GPR) for Bridge Deck Condition Assessment: Using a 1.5 GHz Ground-coupled Antenna written by Amos Wamweya. This book was released on 2009. Available in PDF, EPUB and Kindle. Book excerpt: "This study is a GPR-based assessment of three bridge decks, two with a hot bituminous wearing surface and one with a bare concrete slab. The primary objectives of this study were: 1) to assess the integrity of the three bridge decks using a 1.5 GHz ground-coupled GPR antenna, and 2) to evaluate the utility of the 1.5 GHz ground-coupled antenna for bridge deck investigations. Core control (chloride ion concentration data and core integrity data) and visual inspection were used as interpretive constraint. The acquired GPR data were interpreted, and two plan view maps were generated. One depicts the magnitude of the reflections from the uppermost mat of rebar, and the second shows the arrival time of these reflections. Analysis of the GPR data and core control indicates that the magnitude of the reflected GPR signal from the uppermost mat of rebar is a direct function of concrete integrity. Higher magnitude reflections indicate higher quality concrete. To a lesser extent, the arrival time of the reflected energy is also indicative of concrete quality. Faster arrival times generally indicate higher quality concrete. Exceptions to this rule occur where the depth to the top layer of rebar varies. In this study, relative reflection amplitudes of less than 3000 on the bare concrete bridge and less than 5000 on the bituminous surface bridges indicate severe deterioration. Core control data was interpreted based on chloride ion corrosion threshold. Corrosion of rebar occurs once chloride ions content adjacent to the rebar reaches a threshold of approximately 0.033% to 0.04% by weight of concrete (or 330 ppm to 400 ppm). The GPR data correlates well with the core control, indicating that the 1.5 GHz antenna is an effective tool for assessing the condition of bridge decks"--Abstract, leaf iii
