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 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 Laboratory Evaluation of Pavement Surface Texture Characteristics in Relation to Skid Resistance written by S. H. Dahir and published by . This book was released on 1972 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Pavement Friction Characteristics written by John Jewett Henry and published by Transportation Research Board. This book was released on 2000 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis report will be of interest to pavement design, construction, management, and research engineers, highway safety officials, and others concerned with pavement friction characteristics. It describes the current state of the practice and discusses the methods used for evaluating wet pavement friction characteristics of new and restored pavements. This synthesis reviews models used for measuring and evaluating friction and texture, causes for friction changes over time, and aggregate and mix design to provide adequate friction. Also presented are construction and surface restoration practices for providing good pavement surface characteristics. In addition, considerations of noise and ride quality are discussed when compromise may be required.

Download or read book Computer Evaluation of Pavement Texture Technical report written by E. D. Howerter and published by . This book was released on 1977 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computer Evaluation of Pavement Texture written by and published by . This book was released on 1977 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Surface Condition performance Assessment written by Bouzid Choubane and published by ASTM International. This book was released on 2007 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This new ASTM publication presents the latest information on the practical and developmental aspects of pavement surface evaluation procedures and technologies, including their reliability and relevancy. Seven peer-reviewed papers cover: * Pavement surface characteristics measurement procedures and equipment * Approaches to enhance the reliability and accuracy of pavement surface evaluation systems * Approaches to harmonization between different measurement devices for specific pavement surface condition indicators * Assessment of current pavement condition indicators and their relevancy level for use in asset management * Assessment of factors influencing the interaction of tire/pavement surface characteristics * Assessment of automated distress survey systems * Evaluation of new/promising technologies for pavement condition surveys."--Publisher's website.

Download or read book Evaluation of Pavement Surface Properties and Vehicle Interaction written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1973 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computer Evaluation of Pavement Texture written by E. D. Howerter and published by . This book was released on 1977 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Pavement Surface Friction Treatments written by Shuo Li and published by Purdue University Press. This book was released on 2012-01-12 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The implementation of a pavement preservation program involves a learning curve with not only a determination to succeed, but also the courage to fail. Also, successful implementation of pavement preservation program requires knowledge of the performance of preservation surface treatments over time, which is critical to the select of candidate projects and the development of performance models for pavement management analysis. In addition, preservation surface treatments, such as chip seal, fog seal, microsurfacing, 4.75 mm thin or ultra-thin overlay, can not only repair certain pavement surface defects, but also change the surface characteristics of pavement and therefore affect pavement surface friction performance. Nevertheless, such information is currently not available but is essential for the Indiana Department of Transportation (INDOT) to evaluate the effectiveness of pavement preservation surface treatments. As a concentrated effort, this study focused on the long-term friction performance of preservation surface treatments, particularly those have been widely used and those have seen increasing use by INDOT. Based on the selected field pavement test sections, this study aimed to evaluate the surface characteristics, particularly the long-term friction performance for those surface treatments that have been widely used and have seen increasing use by INDOT, including chip seal, fog-chip, fog seal, rejuvenating seal, microsurfacing, ultrathin bonded wearing course (UBWC), 4.75-mm hot mix asphalt (HMA) thin overlay, and profile milling (or diamond grinding). The test sections for each type of surface treatment covered a wide range of traffic volume from light to high. The service life for the selected test sections varied from 6 months to 60 months. Friction testing was mainly conducted using ASTM E 274 locked wheel trailer. Surface texture testing was conducted using either the ASTM E 2157 circular track meter (CTM) or a laser scanner. Pavement roughness and noise tests were also conducted to address the smoothness and noise issues, particularly on microsurfacing. Detailed analysis was provided to evaluate the friction performance of 4.75-mm HMA overlays. It is believed that the test results and findings drawn from this study not only provides timely information for INDOT to improve its pavement preservation program, but also provides the original information for the potential readers to better utilize preservation surface treatments.

Download or read book Manual on Pavement Evaluation Techniques written by Satish Chandra and published by . This book was released on 2021-08-23 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement evaluation techniques which involve the use of state-of-art technologies and tools for functional and structural evaluation of pavements have become necessity today for health monitoring of road infrastructure and to take appropriate decisions for maintenance, planning and budgeting of road network based on scientific tools. The state-of-art infrastructure facilities available at CSIR-Central Road Research Institute motivates us to write this manual which concisely covers all the major equipment of pavement evaluation, so that the students and field practitioners understand the methodology and follow the correct procedure for functional and structural evaluation of pavement for various purposes. The first chapter of the manual deals with the evaluation of pavement surface roughness for rating the roads as per riding quality criteria. Apart from the methodology for roughness measurement using various equipment, this chapter will help the readers for deciding the appropriate technology depending upon the location and type of the road under study. Second chapter of the manual is related to the micro and macro level assessment of pavement surface characteristics which are related to the measurement of pavement surface texture, skid resistance and polish stone value, to ensure the safe riding pavement surface. Third chapter covers the details about distresses observed on flexible pavements and their measurement techniques. Details of most dominating distresses along with illustrating photographs and severity levels are also given in this chapter. Fourth chapter gives details of axle load surveys using static and weigh-in-motion systems which are required to know the current loading pattern on the project roads for their upgradation and various maintenance needs. Calculation of vehicle damage factor with examples has also been included in this chapter. The fifth chapter deals with the structural health monitoring of roads using Benkelman Beam and Falling Weight Deflection techniques. The details of these two methods and their measurements techniques are given in details with example for estimating the overlay needs using Falling Weight Deflectometer Technique. The use of Network Survey vehicle has also become necessity for road asset and pavement condition monitoring for development of pavement maintenance management systems at network level. The details of a typical network survey vehicle system including its calibration and validation details are given in chapter six. This chapter also includes the tentative specifications of Network Survey Vehicle System to meet the requirements of road asset management systems. We are hopeful that the readers will find the book useful as the procedures of pavement evaluation using equipment have been demonstrated in a simplified way. Suggestion and observations for further improvement of the manual are welcome.

Download or read book The Significance of Pavement Texture written by Glenn G. Balmer and published by . This book was released on 1975 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This paper discusses the influence of roadway surface textures on the skid resistance, the speed-gradient, the wet-pavement accident rate, pavement wear, and the generation of tire-road interaction noise. The tendency of a vehicle to hydroplane is reduced by increasing the texture magnitude. Appropriate textures are developed by using open-graded asphalt friction surface courses and by grooving portland cement concrete with steel tines or a vibrating float while the concrete is plastic. Hardened pavements can be textured by grooving with a diamond saw or by resurfacing with an overlay. More development is needed in texture measurement techniques, especially in automating the stereo-photo interpretation method and the linear polarized laser technique"--Technical report documentation page

Download or read book Texturing of Concrete Pavements Interim Report No 1 written by Joseph E. Ross and published by . This book was released on 1975 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Texture Measurement and Evaluation written by RR. Hegmon and published by . This book was released on 1975 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two methods of texture measurement are described: the outflow meter and profile analysis. The outflow meter measures the time for a fixed quantity of water to escape between a rubber seal and the pavement. Its development from a simple gravity flow instrument to a high-pressure device is described. The single number outflow parameter is not sufficient to provide adequate prediction of the pavement friction-speed relationship, but it is a parameter sensitive to pavement porosity in addition to surface texture. The profile tracer produces an electrical signal analogous to profile height as a stylus traverses the pavement. This signal is recorded and reduced to a meaningful set of parameters describing the root mean square values of the surface height and its derivatives. The profile spectral density is also obtained. Results for five test pavements are presented and compared with locked wheel skid data.

Download or read book Pavement Texture Evaluation and Relationships to Rolling Resistance at MnROAD written by Richard C. Sohaney and published by . This book was released on 2013 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of pavement surface texture were conducted on the test cells at the MnROAD research facility. The testing was performed using a mobile, line-laser-based, texture profiler that provides results in both the longitudinal and transverse directions. In addition to common texture metrics-for example, mean profile depth (MPD)-a variety of other metrics are calculated and reported. This includes the texture level in third-octave wavelength bands (the texture spectrum) and metrics that can distinguish between upward and downward oriented texture (for example, skew). These texture metrics are combined with other pavement surface characteristics measured on the same MnROAD test cells into a single database. The other surface characteristics are coefficient of rolling resistance (CRR), roughness, friction, and tire-pavement noise. Using the results in the database, multivariable linear regression analyses are conducted to investigate the dependency of the CRR on the other surface characteristics. The performance of the various regression analyses is compared and variable combinations yielding good performing models for CRR are presented. Among the conclusions is that many possible combinations of surface characteristic variables are shown to be eligible for a model to predict CRR.

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 Pavement Slipperiness Roughness and Condition Evaluation written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1970 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: