Ground-penetrating Radar Used to Locate and Quantify Voids Beneath Concrete Pavement PDF Download

Author: Florida. Department of Transportation
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 10

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Author: Gerardo G. Clemeña
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 46

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A survey of a jointed, reinforced concrete pavement with groundpenetrating radar indicated that the equipment provides a nondestructive inspection technique that can be used at a minimum rate of 5 lane miles of pavement per hour and with only minimal interference with traffic. The coring of some slabs and subsequent use of a devised water test revealed that the radar was very effective in detecting voids deeper than 1/8 in but considerably less .effective in spotting shallow voids. The overall accuracy was approximately 68%, which indicates that the sensitivity of the equipment needs to be improved. The location component used with the radar unit showed insufficient accuracy. A regression analysis of the recorded quantities of grout used daily in subsealing portions of the pavement versus the total linear feet of vbids detected underneath the slabs grouted each day yielded only a 51% correlation. However, the regression was found to be significant at a 95% probability level. It is believed that if the width and depth of each void can be conveniently estimated so that the extent of voids can be expressed in terms of volume instead of length only, an even more successful method of estimating grout quantities would be available. It has been shown that information derived from a radar survey can be very useful in developing a sound and cost-effective slab stabilization operation through the proper placement of grout holes.

Author: Rexford M. Morey
Publisher: Transportation Research Board
ISBN: 9780309061100
Category : Technology & Engineering
Languages : en
Pages : 48

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This synthesis will be of interest to state Department of Transportation (DOT) geotechnical, bridge, and pavement engineers, engineering geologists, consultants involved with ground penetrating radar (GPR) investigations for state DOTs, and researchers. It describes the current state of the practice of using GPR for evaluating subsurface conditions for transportation facilities. This was accomplished by conducting a literature search and review and an extensive survey of U.S. and Canadian transportation agencies and practitioners, as well as limited international information collection. GPR is a noninvasive nondestructive tool used in transportation applications such as evaluation and characterization of pavement systems, soils, and environmental problems. This report of the Transportation Research Board presents information on the principles, equipment, logistics, applications, and limitations of GPR pertaining to transportation applications. Selected case studies for which ground truth information is available are presented. In addition, an extensive bibliography and glossary are provided as well as appending information about GPR manufacturers from their literature.

Author: Albert Jasper Bush
Publisher: ASTM International
ISBN: 0803112602
Category : Kaldırımlar-Deneme
Languages : en
Pages : 701

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Author: Dar Hao Chen
Publisher:
ISBN:
Category : Earth pressure
Languages : en
Pages : 8

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Detecting the presence and extent of subsurface voids under a roadway structure is critical in preventing major failures from occurring. In this study, a 400 MHz Ground-coupled Penetrating Radar (GCPR) was utilized in four projects to locate voids. The air voids present a strong dielectric contrast to GPR waves and therefore these anomalies are clearly identified on GCPR results/plots. In one study, a large void more than 1.8 m in depth was located under the continuous reinforced concrete pavement on IH40 in the Amarillo District of Texas. In total, 3.8 cubic metres of flowable fill was used to fill the void. Voids with depths from 50 to 400 mm were identified and verified in studies on SH6, IH35, and Spur 380. The voids are typically located directly under the surface pavement layer. This study has successfully demonstrated that the GCPR is able to identify void locations. However, drilling and coring should also be done to determine the extent and depth of the void.

Author: George Morcous
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 80

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Author: Lawrence B. Conyers
Publisher: Altamira Press
ISBN:
Category : Science
Languages : en
Pages : 238

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Traditional archaeological excavation methods are sometimes daunting due to political or financial complications. Other times, an improperly planned dig can destroy or entirely overlook the features or artifacts being sought. In either case, Ground-Penetrating Radar, or GPR, is an increasingly applicable technology, but one that few archaeologists truly understand. That is where this book excels. It is tailored towards an archaeological community which is for the most part apprehensive about using "high tech" instruments and feel more comfortable on their hands and knees digging in the dirt. Its abundant illustrations and easy-to-understand tables help to keep this potentially daunting subject matter accessible. It also contains more complex equations and theory so that the more technically-oriented can use it as a reference tool.

Author: Andrea Benedetto
Publisher: Springer
ISBN: 3319048139
Category : Science
Languages : en
Pages : 373

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This book, based on Transport and Urban Development COST Action TU1208, presents the most advanced applications of ground penetrating radar (GPR) in a civil engineering context, with documentation of instrumentation, methods and results. It explains clearly how GPR can be employed for the surveying of critical transport infrastructure, such as roads, pavements, bridges and tunnels and for the sensing and mapping of underground utilities and voids. Detailed attention is also devoted to use of GPR in the inspection of geological structures and of construction materials and structures, including reinforced concrete, steel reinforcing bars and pre/post-tensioned stressing ducts. Advanced methods for solution of electromagnetic scattering problems and new data processing techniques are also presented. Readers will come to appreciate that GPR is a safe, advanced, non destructive and noninvasive imaging technique that can be effectively used for the inspection of composite structures and the performance of diagnostics relevant to the entire life cycle of civil engineering works.

Author: Stanley S. Smith
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 196

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Author: Waheed Uddin
Publisher:
ISBN:
Category : Ground penetrating radar
Languages : en
Pages : 120

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