Download or read book Accuracy and Precision Evaluation of Traffic Speed Pavement Deflection Devices written by Jorge A. Velarde Moreno and published by . This book was released on 2015 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pavement Structural Evaluation at the Network Level written by Gonzalo R. Rada and published by . This book was released on 2016 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Use of Embedded Sensors to Evaluate Performance of Traffic Speed Deflection Devices written by J. A. Velarde and published by . This book was released on 2016 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural adequacy, which is an important aspect of pavement management activities, is typically evaluated using surface pavement deflections measured by the falling weight deflectometer (FWD). Technology that can collect continuous deflection data at traffic speeds can potentially supplant single-point location deflection measurements provided by the FWD for network-level pavement management system (PMS) applications. Previous studies have evaluated the traffic speed deflection devices (TSDD) performance by comparing their results with the FWD measurements. Although appropriate correlations and indices to compensate for the differences in load have been made, a direct comparison under the same loading conditions has not been reported in the literature. The purpose of this paper was to present the results of a field study to evaluate TSDDs by comparing their pavement deflection parameters with those from embedded sensors under actual loads. Two TSDDs were used in this study: the Greenwood traffic speed deflectometer (TSD), and the Applied Research Associates, Inc. (ARA) rolling wheel deflectometer (RWD). The lessons learned from the study are emphasized for further consideration toward developing a calibration methodology for value-added future analyses.
Download or read book Bearing Capacity of Roads Railways and Airfields written by Andreas Loizos and published by CRC Press. This book was released on 2017-07-20 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bearing Capacity of Roads, Railways and Airfields includes the contributions to the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017, 28-30 June 2017, Athens, Greece). The papers cover aspects related to materials, laboratory testing, design, construction, maintenance and management systems of transport infrastructure, and focus on roads, railways and airfields. Additional aspects that concern new materials and characterization, alternative rehabilitation techniques, technological advances as well as pavement and railway track substructure sustainability are included. The contributions discuss new concepts and innovative solutions, and are concentrated but not limited on the following topics: · Unbound aggregate materials and soil properties · Bound materials characteritics, mechanical properties and testing · Effect of traffic loading · In-situ measurements techniques and monitoring · Structural evaluation · Pavement serviceability condition · Rehabilitation and maintenance issues · Geophysical assessment · Stabilization and reinforcement · Performance modeling · Environmental challenges · Life cycle assessment and sustainability Bearing Capacity of Roads, Railways and Airfields is essential reading for academics and professionals involved or interested in transport infrastructure systems, in particular roads, railways and airfields.
Download or read book Evaluation of Pavement Deflection Measuring Equipment written by and published by . This book was released on 1987 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the research performed on evaluation of pavement deflection equipment under Contract DTFH61-85-C-00115 for the Federal Highway Administration. The following devices were included in side-by-side field tests conducted in the Austin, Texas area during the week of August 11, 1986: the Benkelman Beam, C.E.B.T.P. Curviameter, Dynaflect, Dynatest Falling Weight Deflectometer (FWD), Kuab FWD, Phonix FWD, and the Road Rater. The report includes descriptions and comparisons of the devices through information obtained from a literature search, field tests and user survey conducted for this study. The side-by-side test program was performed over a broad range of pavement structures, including thick and thin flexible and rigid pavements, and composite pavements. The measured deflections were compared statistically. Mechanistic interpretations of the measured deflection basins were made and compared.
Download or read book State Departments of Transportation Experiences and Applications with Traffic Speed Deflection Devices written by and published by . This book was released on 2022 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic speed deflection devices (TSDDs) are designed to measure pavement deflections or deflection velocities in response to loads applied by trucks moving at or near prevailing traffic speeds. TRB's Transportation Research Circular E-C276: State Departments of Transportation Experiences and Applications with Traffic Speed Deflection Devices details a 2019 workshop, Workshop on the Use of Traffic Speed Deflection Device Data in Network-and Project-Level Pavement Decisions, which brought together six national and international experts on the subject who shared their thoughts, experiences, and vision for the future of TSDDs.
Download or read book Development of an Integrated Survey Vehicle for Measuring Pavement Surface Conditions at Highway Speeds Technical report written by James C. Wambold and published by . This book was released on 1990 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to develop an integrated survey vehicle for measuring pavement surface conditions at highway speeds. This was accomplished by determining the requirements and operating characteristics for such a system, preparing a design, and estimating initial and operating costs. Volume 1 contains a review of the data and measurement needs for pavement condition surveys. The equipment available and under development for this purpose are identified with emphasis on measurements at highway speeds. Volume 2 contains detailed information about the design, costs, specifications, and software associated with the integrated survey vehicle. The system drawings for the vehicle are provided.
Download or read book Evaluation of Traffic Speed Deflectometer for Pavement Structural Evaluation in Louisiana written by Zia Uddin Ahmed Zihan and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances on Testing and Experimentation in Civil Engineering written by Carlos Chastre and published by Springer Nature. This book was released on 2022-08-17 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the recent advances on testing and experimentation in civil engineering, especially in the branches of geotechnics, transportation, hydraulics, and natural resources. It includes advances in physical modelling, monitoring techniques, data acquisition and analysis, and provides an invaluable contribution for the installation of new civil engineering experimental facilities. The first part of the book covers the latest advances in testing and experimentation in key domains of geotechnics: soil mechanics and geotechnical engineering, rock mechanics and rock engineering, and engineering geology. Some of the topics covered include new developments in topographic survey acquisition for applied mapping and in situ geotechnical investigations; laboratory and in situ tests to estimate the relevant parameters needed to model the behaviour of rock masses and land structures; monitoring and inspection techniques designed for offshore wind foundations. The second part of the book highlights the relevance of testing and monitoring in transportation. Full-scale accelerated pavement testing, and instrumentation becomes even more important nowadays when, for sustainability purposes, non-traditional materials are used in road and airfield pavements. Innovation in testing and monitoring pavements and railway tracks is also developed in this part of the book. Intelligent traffic systems are the new traffic management paradigm, and an overview of new solutions is addressed here. Finally, in the third part of the book, trends in the field and laboratory measurements and corresponding data analysis are presented according to the different hydraulic domains addressed in this publication, namely maritime hydraulics, surface water and river hydraulics and urban water.
Download or read book Evaluation of Rut Depth Accuracy and Precision Using Different Automated Measurement Systems written by Pedro A. Serigos and published by . This book was released on 2014 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collecting accurate rutting data is important to assess network-level pavement conditions and to determine maintenance and rehabilitation needs and funding levels to optimize the use of available economic resources. The technical objective of this study was the assessment of the rut-depth (RD) accuracy and precision of different continuous automated systems (CASs), which represent the state-of-the-art for the automated data collection of rutting and discrete automated systems (DASs), which are still used by several departments of transportation in the United States. The RD values analyzed in this study were obtained by: (1) field measurements at highway speeds using five different optical CASs, and (2) calculation simulating the use of DASs with different configurations. The analysis of the first type of values assessed the closeness of the RD produced by the different CASs to the RD manually measured for this study. The analysis of the second type of values assessed the effects of the number of sensors and the width of measurement on the accuracy and precision of the DASs. In addition, the impact of the RD accuracy and precision on the assessed pavement condition at the network level was analyzed for both the CAS that participated in the experiment and the simulated DAS.
Download or read book Network Level Testing for Pavement Structural Evaluation Using a Rolling Wheel Deflectometer written by Daba S. Gedafa and published by . This book was released on 2010 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Quality Management of Pavement Condition Data Collection written by Gerardo W. Flintsch and published by Transportation Research Board. This book was released on 2009 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by Albert Jasper Bush and published by ASTM International. This book was released on 1989 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 1999 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by Shiraz D. Tayabji and published by ASTM International. This book was released on 2000 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: As with the previous two symposia, the 32 papers from the June/July, 1999, Seattle symposium present advances in the nondestructive testing of pavements using conventional falling weight deflectometer techniques and other promising techniques such as ground penetrating radar, rolling weight deflecto
Download or read book Semi Active Suspension Control Design for Vehicles written by Sergio M. Savaresi and published by Elsevier. This book was released on 2010-08-13 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semi-Active Suspension Control Design for Vehicles presents a comprehensive discussion of designing control algorithms for semi-active suspensions. It also covers performance analysis and control design. The book evaluates approaches to different control theories, and it includes methods needed for analyzing and evaluating suspension performances, while identifying optimal performance bounds. The structure of the book follows a classical path of control-system design; it discusses the actuator or the variable-damping shock absorber, models and technologies. It also models and discusses the vehicle that is equipped with semi-active dampers, and the control algorithms. The text can be viewed at three different levels: tutorial for novices and students; application-oriented for engineers and practitioners; and methodology-oriented for researchers. The book is divided into two parts. The first part includes chapters 2 to 6, in which fundamentals of modeling and semi-active control design are discussed. The second part includes chapters 6 to 8, which cover research-oriented solutions and case studies. The text is a comprehensive reference book for research engineers working on ground vehicle systems; automotive and design engineers working on suspension systems; control engineers; and graduate students in control theory and ground vehicle systems. Appropriate as a tutorial for students in automotive systems, an application-oriented reference for engineers, and a control design-oriented text for researchers that introduces semi-active suspension theory and practice Includes explanations of two innovative semi-active suspension strategies to enhance either comfort or road-holding performance, with complete analyses of both Also features a case study showing complete implementation of all the presented strategies and summary descriptions of classical control algorithms for controlled dampers
Download or read book Finding Solutions of the 21st Century Transportation Problems Through Research and Innovations written by Zahid Hossain and published by Springer Nature. This book was released on 2021-07-14 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents challenges in transportation infrastructures and geotechniques, advancements in recycling, soil stabilization and reinforcement technologies, and assessments of roadway conditions using modern tools and techniques. The articles presented in this volume focus on fundamental investigations on various aspects of civil engineering materials and structures. The scope of this volume is the application of findings for solving problems in geotechnical, pavement, concrete and transportation engineering using through smart, green and emerging techniques. The primary audience of this work will be researchers, professionals, and practitioners around the world. This volume is based on contributions to the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- Nanchang, China, 2021.
