Download or read book Three dimensional Pavement Surface Texture Measurement and Statistical Analysis written by Qingfan Liu and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide for Pavement Friction written by and published by AASHTO. This book was released on 2008 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.

Download or read book Improving Pavement Surface Texture Using Laser Scanning and Numerical Analysis written by Sareh Kouchaki and published by . This book was released on 2019 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safe roads need pavement surfaces that provide an adequate level of skid resistance to reduce accidents, especially under wet conditions. The extent of skid resistance available on any given pavement is dependent on the design of the surface texture. When the pavement surface texture is worn, the tire-pavement friction decreases and consequently the safety of the road users is reduced. Proper aggregate selection before construction helps in preserving adequate levels of skid resistance over the service life of the pavements. The critical engineering features expected from aggregates are their surface texture and resistance to the polishing actions of traffic. Currently, there are no standard quantitative test methods to measure the surface texture of aggregate particles directly. Besides, the existing laboratory test procedures used to evaluate the polishing resistance of aggregates are time-consuming, subjective, and cannot appropriately represent their frictional properties. A laboratory protocol is needed to assess the quality of aggregate particles for frictional purposes accurately. Investigating the changes in pavement macrotexture is also required during the life of pavements to assess the potential skid-related problems and reduce crashes effectively. The pavement macrotexture is predominantly described by the Mean Texture Depth (MTD) using the Sand Patch Test (SPT), and by the Mean Profile Depth (MPD) using non-contact single-point profilometers. The reliability of the SPT is questionable because it is operator-dependent and the MPD calculated using a single texture profile cannot adequately describe the pavement texture. The limitations of the current measuring methods for pavement texture have directed researchers toward looking for new, more objective, accurate and reliable technologies that could potentially contribute towards better pavement surface texture evaluation. With a better texture characterization, highway agencies can better assess the level of skid resistance of their highway network with the aim of ensuring safer roads for the public. The main contributions of this dissertation include a series of procedures and algorithms, developed using a high-resolution line laser scanner (LLS) prototype, to improve capturing and characterizing hot-mix asphalt (HMA) pavement surface texture. The methods and algorithms that have been developed in this dissertation include: 1) An outlier and spikes removal technique and set of criteria employing several filters to create clean 3D models of pavement surfaces, 2) A methodology to obtain the micro- and macrotexture of the surface profiles captured by the LLS, and automatically calculate the MPD based on pavements 3D texture data, 3) An algorithm to mimic the SPT on pavements 3D models and to automatically estimate the MTD based on the 3D texture data, 4) A new approach for quantification and differentiation the aggregates surface texture by using spectral analysis, 5) Using the Micro-Deval machine along with the LLS to develop a method for measuring aggregate polishing resistance, and 6) To categorize the aggregate particles based on their polishing resistance using model-based clustering techniques. This study was complemented by conducting a series of experimental field tests to compare the performance of the developed macrotexture characterization algorithms with current test methods. Results confirmed that the proposed algorithms could provide efficient, reliable, repeatable, and accurate measurements of the pavement surface macrotexture. Laboratory experiments were also conducted to characterize the polishing properties of seven types of aggregates based on their texture evolution. Following the polishing process, surface elevation profiles were obtained using the LLS and analyzed to determine the rate of change in the surface texture of aggregate samples. Texture measurements were carried out by using several texture parameters. Both visual examinations and statistical analysis were used to identify the differences between the aggregates polishing properties. The results showed that the polishing tendency of aggregates evaluated could be grouped according to the rate of change in surface texture

Download or read book Measurement and Characterization of Asphalt Pavement Surface Macrotexture Using Three Dimensional Laser Scanning Technology written by Feng Hong and published by . This book was released on 2014 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement macrotexture plays a critical role in highway users' safety. It is also closely related to tire-pavement interaction noise. In recent years, continuous effort has been made toward three-dimensional macrotexture measurement in the field to accommodate pavement management. This study presents a newly developed macrotexture measuring system with 3D laser scanning technology. The underlying system demonstrates a series of desirable properties including: (1) 3D surface feature, (2) high speed data collection, (3) large sampling capacity, (4) high resolution and accuracy, and (5) ease of operation. Based on data collected on a real-world asphalt pavement by the system, it is demonstrated that the existing pavement macrotexture evaluation indexes are extended from 2D to 3D. By comparison, it is shown that the 3D indexes are able to characterize pavement macrotexture in a more comprehensive and realistic manner. The correlation among the 3D indexes is also evaluated, which provides pavement researchers and engineers more flexibility in selecting relevant indexes in macrotexture property evaluation.

Download or read book Entropy in Image Analysis written by Amelia Carolina Sparavigna and published by MDPI. This book was released on 2019-06-24 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Image analysis is a fundamental task for extracting information from images acquired across a range of different devices. Since reliable quantitative results are requested, image analysis requires highly sophisticated numerical and analytical methods—particularly for applications in medicine, security, and remote sensing, where the results of the processing may consist of vitally important data. The contributions to this book provide a good overview of the most important demands and solutions concerning this research area. In particular, the reader will find image analysis applied for feature extraction, encryption and decryption of data, color segmentation, and in the support new technologies. In all the contributions, entropy plays a pivotal role.

Download or read book Road and Airfield Pavement Technology written by H. R. Pasindu and published by Springer Nature. This book was released on 2022-03-03 with total page 917 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations, and applications in the field of pavement technology, presented at the 12th International Conference in Road and Airfield Pavement Technology (ICPT), hosted by the University of Moratuwa, Sri Lanka, and held on July 14-16, 2021. It covers topics such as pavement design, evaluation and construction, pavement materials characterization, sustainability in pavement engineering, pavement maintenance and rehabilitation techniques, pavement management systems and financing, transportation safety, law and enforcement related to pavement engineering, pavement drainage and erosion control, GIS applications, quarry material assessment, pavement instrumentation, IT and AI applications in pavement. Featuring peer-reviewed contributions by leading international researchers and engineers, the book is a timely and highly relevant resource for materials scientists and engineers interested in pavement engineering.

Download or read book Analysis of Three dimensional Surface Texture written by Brian Donald Boudreau and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Surface Texture Significance and Measurement Volume I Summary Report written by James C. Wambold and published by . This book was released on 1984 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterisation of Areal Surface Texture written by Richard Leach and published by Springer Science & Business Media. This book was released on 2013-04-03 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: The function of a component part can be profoundly affected by its surface topography. There are many examples in nature of surfaces that have a well-controlled topography to affect their function. Examples include the hydrophobic effect of the lotus leaf, the reduction of fluid drag due to the riblet structure of shark skin, the directional adhesion of the gecko foot and the angular sensitivity of the multi-faceted fly eye. Surface structuring is also being used extensively in modern manufacturing. In this way many properties can be altered, for example optical, tribological, biological and fluidic. Previously, single line (profile) measurements were adequate to control manufacture of surfaces, but as the need to control the functionality of surfaces increases, there is a growing need for three-dimensional (areal) measurement and characterisation techniques. For this reason there has been considerable research, development and standardisation of areal techniques. This book will present the areal framework that is being adopted by the international community. Whereas previous books have concentrated on the measurement aspects, this book concentrates on the characterisation techniques, i.e. how to interpret the measurement data to give the appropriate (functional) information for a given task. The first part of the book presents the characterisation methods and the second part case studies that highlight the use of areal methods in a broad range of subject areas - from automobile manufacture to archaeology. Contents Introduction to Surface Topography The Areal Field Parameters The Areal Feature Parameters Areal Filtering Methods Areal Form Removal Areal Fractal Methods Choosing the Appropriate Parameter Characterisation of Individual Areal Features Multi-Scale Signature of Surface Topography Correlation of Areal Surface Texture Parameters to Solar Cell Efficiency Characterisation of Cylinder Liner Honing Textures for Production Control Characterisation of the Mechanical Bond Strength for Copper on Glass Plating Applications Inspection of Laser Structured Cams and Conrods Road Surfaces

Download or read book Pavement Design and Materials written by A. T. Papagiannakis and published by John Wiley & Sons. This book was released on 2017-02-22 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art guide to pavement design and materials With innovations ranging from the advent of SuperpaveTM, the data generated by the Long Term Pavement Performance (LTPP) project, to the recent release of the Mechanistic-Empirical pavement design guide developed under NCHRP Study 1-37A, the field of pavement engineering is experiencing significant development. Pavement Design and Materials is a practical reference for both students and practicing engineers that explores all the aspects of pavement engineering, including materials, analysis, design, evaluation, and economic analysis. Historically, numerous techniques have been applied by a multitude of jurisdictions dealing with roadway pavements. This book focuses on the best-established, currently applicable techniques available. Pavement Design and Materials offers complete coverage of: The characterization of traffic input The characterization of pavement bases/subgrades and aggregates Asphalt binder and asphalt concrete characterization Portland cement and concrete characterization Analysis of flexible and rigid pavements Pavement evaluation Environmental effects on pavements The design of flexible and rigid pavements Pavement rehabilitation Economic analysis of alternative pavement designs The coverage is accompanied by suggestions for software for implementing various analytical techniques described in these chapters. These tools are easily accessible through the book’s companion Web site, which is constantly updated to ensure that the reader finds the most up-to-date software available.

Download or read book Texturing of Concrete Pavements written by Jim W. Hall and published by Transportation Research Board. This book was released on 2009 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores a recommended process for determining the type of concrete pavement texture that may be used for a specific highway project. The process considers the effects of texture type on friction and noise characteristics.

Download or read book Introduction to Unmanned Aircraft Systems Second Edition written by Douglas M. Marshall and published by CRC Press. This book was released on 2015-10-26 with total page 1944 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.

Download or read book Design of Long life Flexible Pavements for Heavy Traffic written by M. E. Nunn and published by . This book was released on 1997 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to an increase in traffic levels over the last 20 years, the costs and disruption of roadworks have increased proportionately. This has led to a re-evaluation of previous standards, and a proposal that a design life of 40 years for heavily trafficked areas should become the new standard. This report reviews design practice and information on flexible pavement performance, and develops an improved design method for heavily trafficked, flexible pavement. design criteria and design concepts. A well constructed pavement, built above threshold strength, will have a very long structural service life provided that distress, in the form of cracks and ruts appearing at the surface, is treated before it begins to affect the structural integrity of the road.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1976 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Pavement Surface Texture written by James C. Wambold and published by . This book was released on 1984 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: "It is generally agreed that the skid resistance of a pavement is controlled by the surface texture characteristics. Therefore, by measuring the relevant parameters describing texture, or by measuring a physical process dependent on texture, regression techniques can be used to relate skid resistance to the chosen texture parameter or process. Two scales of texture are of particular importance: microtexture (small-scale asperities) and macrotexture (large-scale asperities). This report describes work performed to: (1) review candidate macrotexture and microtexture measurement methods that can be made at highway speeds (at or above 40 mph), which are presently used or have potential for use in pavement texture measurement; (2) design and build a prototype of the most promising method; (3) evaluate the effects of pavement surface texture on skid resistance; and (4) investigate non-friction-related effects of pavement surface texture. A prototype noncontact vision system which takes texture measurements at highway speeds was developed, and several improvements were made to upgrade the system to provide an advanced-operational prototype. Both hardware and software enhancements have yielded a texture measurement system that is a fast, efficient, and reliable way of obtaining pavement macrotexture data"--Technical report documentation p.

Download or read book Three dimensional Imaging Optical Metrology and Inspection written by and published by . This book was released on 1999 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Surface Texture Significance and Measurement Volume II Comprehensive Report Final Report written by James C. Wambold and published by . This book was released on 1984 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: