Investigation Of The Rolling Wheel Deflectometer As A Network Level Pavement Structural Evaluation Tool
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Investigation Of The Rolling Wheel Deflectometer As A Network Level Pavement Structural Evaluation Tool
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Author : Brian K. Diefenderfer
language : en
Publisher:
Release Date : 2010
Investigation Of The Rolling Wheel Deflectometer As A Network Level Pavement Structural Evaluation Tool written by Brian K. Diefenderfer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavements categories.
The Virginia Department of Transportation (VDOT) currently uses the results of automated surface distress surveys to assist in developing pavement maintenance strategies for its interstate and primary roadways. Totaling nearly 27,000 lane-miles, these roadways consist of flexible, rigid, and composite (flexible over rigid) pavements. These video-based surface distress data consist of quantities of distress that are visible in the pavement surface. Obtaining structural data from falling weight deflectometer (FWD) testing has only recently been implemented at the network level. A growing area of interest in pavements research is developing new and faster technologies that are well suited for nondestructively assessing the pavement structure without causing delays to the traveling public. One recently developed system, the rolling wheel deflectometer (RWD), measures the response from one-half of an 18-kip single-axle load traveling at normal highway speeds. This technology can measure deflections for approximately 200 to 300 lane-miles per day, which is approximately 10 times the production of traditionally used FWD testing. The primary advantages of using RWD are twofold: the testing can be conducted at highway speeds for increased safety, and the loading by the RWD is thought to replicate better the actual dynamic effects on pavements caused by heavy vehicle loading. A potential application might be to use the RWD to pre-screen the pavement network to identify areas where more detailed investigations are needed (e.g., by traditional FWD testing). This report provides the results of RWD testing on three Virginia routes and a comparison of the deflection results obtained with RWD and FWD testing on sections of I-64 and I-81. The RWD provided deflection measurements over long distances at or near highway speeds with minimal interruption to the highway users, and the RWD and FWD deflection results were not well correlated. Further, the standard deviation of the RWD deflection results fluctuated with changes in surface mix type. For these reasons, the study recommends that VDOT not pursue additional RWD testing on roadways that are expected to have low deflection values and are likely to be uniform in structural cross-section (i.e., conditions that might be expected on interstate facilities).
Network Level Testing For Pavement Structural Evaluation Using A Rolling Wheel Deflectometer
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Author : Daba S. Gedafa
language : en
Publisher:
Release Date : 2010
Network Level Testing For Pavement Structural Evaluation Using A Rolling Wheel Deflectometer written by Daba S. Gedafa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Pavement temperature categories.
Structural evaluation can be very useful at the network level of pavement management for project prioritization purposes. However, due to expenses involved in data collection and analysis, pavements are not tested for structural capacity at the network level. Rolling wheel deflectometer (RWD), which measures surface deflections at highway speed, is an alternate, faster method of pavement deflection testing for network level data collection. This study was initiated to assess the feasibility of using RWD for network level pavement deflection measurements. RWD deflection data was collected under an 80-kN axle load and at about highway speed on non-interstate highways in northeast Kansas in July 2006. Falling-wheel deflectometer (FWD) data on these roads, collected from 1998 to 2006, were also used for comparison. The computed effective structural numbers from both FWD and RWD deflection data were compared. The results show that the deflections measured by RWD and the center (first sensor) deflections from FWD are statistically similar. The effective structural numbers computed from the FWD and RWD deflection measurements are also statistically similar. Thus RWD appears to be a valuable tool for structural capacity evaluation of pavements at the network level.
Pavement Structural Evaluation At The Network Level
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Author : Gonzalo R. Rada
language : en
Publisher:
Release Date : 2016
Pavement Structural Evaluation At The Network Level written by Gonzalo R. Rada and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Pavements categories.
As State transportation departments consider structural adequacy as part of their routine pavement management system (PMS) activities by incorporating deflection testing, it is important to advance their practices from measuring deflection using falling weight deflectometers, which involves a slow, stop-and-go operation and requires lane closures, to a more viable alternative for network-level pavement management applications. The development of moving deflection testing devices that can measure pavement responses at traffic speeds represents this more viable alternative. The modern versions of the moving deflection testing devices that are actively used today include the Traffic Speed Deflectometer (TSD) and a Rolling Wheel Deflectometer (RWD). The goal of this project was to establish a reliable measure of the structural condition of bound pavement layers above the unbound base layer as it deteriorates over time under traffic and environmental loading based on moving pavement deflection technology measuring at traffic speeds. Moreover, this measure needed to be robust enough in capturing the structural condition or deterioration of the pavement layer notwithstanding the seasonal and spatial variation in base and subgrade layers. As part of the project, a literature review was conducted, and questionnaires were developed for device manufacturers, owners, and users, which were then followed up by interviews. Both the TSD and RWD were found to be potentially viable devices. Based on this finding, a work plan was developed and implemented to evaluate if the two devices met a minimum set of specifications related to the structural evaluation of pavements at the network level including accuracy and precision of deflection measurements, monitoring applied load, operating speed, and distance between deflection measurements. Field evaluations and validation analyses were completed in accordance with the work plan. Ultimately, analysis methodologies and processes were developed for incorporating pavement structural information within highway agencies' PMS applications.
Pavement Asset Management
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Author : Ralph Haas
language : en
Publisher: John Wiley & Sons
Release Date : 2015-05-26
Pavement Asset Management written by Ralph Haas and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-26 with Technology & Engineering categories.
Comprehensive and practical, Pavement Asset Management provides an essential resource for educators, students and those in public agencies and consultancies who are directly responsible for managing road and airport pavements. The book is comprehensive in the integration of activities that go into having safe and cost-effective pavements using the best technologies and management processes available. This is accomplished in seven major parts, and 42 component chapters, ranging from the evolution of pavement management to date requirements to determining needs and priority programming of rehabilitation and maintenance, followed by structural design and economic analysis, implementation of pavement management systems, basic features of working systems and finally by a part on looking ahead. The most current methodologies and practical applications of managing pavements are described in this one-of-a-kind book. Real world up-to-date examples are provided, as well as an extensive list of references for each part.
Surface Deflections Of Perpetual Pavement Sections
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Author : Douglas A. Steele
language : en
Publisher:
Release Date : 2012
Surface Deflections Of Perpetual Pavement Sections written by Douglas A. Steele and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Falling-weight deflectometer (FWD) categories.
Structural evaluation provides valuable information at the network level of pavement management for project evaluation and prioritization purposes. However, due to the expenses involved in data collection and analysis, structural capacity is usually not evaluated at the network level. A rolling-wheel deflectometer (RWD), which measures surface deflections at highway speed, can be an alternate, faster method of pavement deflection evaluation for network-level data collection. This study was initiated in order to assess the feasibility of using an RWD for network-level pavement deflection measurements. RWD deflection data were collected under an 80 kN axle load and at a highway speed of about 88 km/h on four perpetual pavement sections in Kansas. Falling-weight deflectometer (FWD) data were also collected concurrently. The FWD first-sensor deflections were normalized to a load of 40 kN and then corrected to a temperature of 20° C. The RWD deflections were also corrected for temperature. FWD and RWD center deflections were then compared statistically. The results show that the deflections measured by RWD and the center (first sensor) deflections from the FWD are statistically similar. Furthermore, there is a linear relationship between FWD and RWD center deflections for all sections.
Network Level Pavement Structural Testing With The Traffic Speed Deflectometer
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Author : Samer W. Katicha
language : en
Publisher:
Release Date : 2020
Network Level Pavement Structural Testing With The Traffic Speed Deflectometer written by Samer W. Katicha and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Pavements, Asphalt concrete categories.
This report describes research conducted to incorporate pavement structural condition information obtained from the Traffic Speed Deflectometer (TSD) into the Virginia Department of Transportation (VDOT) pavement management system decision making process for bituminous pavement sections. Testing was conducted on a 4,000-mile (1,500 interstate miles and 2,500 primary roads miles) subset of the VDOT network. The report showed that the pavement structural condition, as measured by the TSD, has an impact on the rate of deterioration of the pavement surface. In addition, for the set of collected data, the consistency between the TSD and Falling Weight Deflectometer (FWD) in identifying the same weak sections was found to be higher than the consistency between repeated sets of FWD measurements performed in the Bristol district. The consistency was defined as the percentage of structurally weak sections identified by both devices as a proportion of the number of weak sections. Also, the distribution of the effective structural number (SNeff) calculated from the TSD measurements on interstate roads was found to be similar to that obtained from the FWD measurements. The relatively good consistency between the TSD and FWD SNeff and the similarities between the SNeff distributions suggest that the structural information derived from the TSD can be successfully used as an alternative to similar data derived from the FWD for VDOT network level pavement management applications. The resilient modulus (MR) based on FWD testing is a metric currently used by VDOT to characterize the subgrade strength. A number of TSD-based indices have been proposed in the literature to replace the FWD-based MR. In this study, all indices investigated that could be used to replace the FWD-based MR were also found to be highly correlated to the overall TSD-based structural properties of the pavement and not very highly correlated to the FWD based MR. Thus, adding a TSD-based measure of the subgrade strength was not recommended at this time. Although the reasons for this lack of correlation between TSD-based and FWD-based subgrade strength measurements are not clear, they likely include unquantified differences in subgrade moisture conditions between measurements from the two devices and also possible limitations of the TSD technology in capturing very small deflections far away from the load application. An augmented structural condition matrix was used to investigate the effects of incorporating the TSD-based structural condition on the annual mix of pavement rehabilitation treatments recommended and on the resulting average maintenance cost per mile on interstate roads. The approach did not account for the traffic level and pavement age as currently used by VDOT. The treatment categories considered by VDOT are Do Nothing, Preventive Maintenance, Corrective Maintenance, Restorative Maintenance, and Reconstruction. The augmented matrix modifies these treatments based on whether the structural condition is Strong, Fair, or Weak. In general, applying the augmented matrix on the tested interstate network reduced the percentage of the network recommended for Corrective Maintenance and increased the recommended percentages of the other treatments, mainly Preventive Maintenance and Restorative Maintenance, and to a lesser extent the percentages recommended for Do Nothing or Reconstruction.
Quality Management Of Pavement Condition Data Collection
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Author : Gerardo W. Flintsch
language : en
Publisher: Transportation Research Board
Release Date : 2009
Quality Management Of Pavement Condition Data Collection written by Gerardo W. Flintsch and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Technology & Engineering categories.
Use Of Falling Weight Deflectometer Data For Assessing Pavement Structural Evaluation Values
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Author : Tanveer Chowdhury
language : en
Publisher:
Release Date : 1999
Use Of Falling Weight Deflectometer Data For Assessing Pavement Structural Evaluation Values written by Tanveer Chowdhury and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Pavements categories.
Structural evaluation can be very useful at the network level for project prioritization purposes. In the project priority ranking procedure of the Kansas Department of Transportation (KDOT), a pavement rating attribute, Pavement Structural Evaluation (PSE), is used. These ratings are subjective. his study outlines an approach based on the classical multiple regression analysis resulting in a better estimation of the PSE values using the results from the Falling Weight Deflectometer (FWD) tests and network-level distress survey. The regression models proposed in this study predict the decrease in PSE values by taking into account the FWD data, age, thickness, and distress levels of pavements, and very closely approximate the current PSE ratings obtained at the district level.
Nchrp Synthesis 401
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Author :
language : en
Publisher: Transportation Research Board
Release Date :
Nchrp Synthesis 401 written by and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Issues In Teaching And Education Policy Research And Special Topics 2011 Edition
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Author :
language : en
Publisher: ScholarlyEditions
Release Date : 2012-01-09
Issues In Teaching And Education Policy Research And Special Topics 2011 Edition written by and has been published by ScholarlyEditions this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-09 with Education categories.
Issues in Teaching and Education Policy, Research, and Special Topics: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Teaching and Education Policy, Research, and Special Topics. The editors have built Issues in Teaching and Education Policy, Research, and Special Topics: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Teaching and Education Policy, Research, and Special Topics in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Teaching and Education Policy, Research, and Special Topics: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.