Download or read book Research on Pavement Polishing written by S. H. Dahir and published by . This book was released on 1974 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Road Dust as Related to Pavement Polishing written by Luke Shuler and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Polishing Characteristics of Limestone and Sandstone Aggregates in Regard to Pavement Slipperiness written by William John Stutzenberger and published by . This book was released on 1958 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 The Prediction of Pavement Surface Aggregate Wear and Microtextural Polishing written by Adelia Nataadmadja and published by . This book was released on 2016 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Skid resistance of road surfaces generally decreases over time. Since there is a direct relationship between the inadequacy of skid resistance and the increasing number of crashes caused by wet pavements and loss of control vehicles, it is necessary to ensure the skid resistance of road surfaces is always present at an adequate level. Thus, it is desirable to be able to predict the long term in-field skid resistance performance of road materials (aggregates) before the road is constructed. The most popular method to assess the skid resistance performance of aggregates is the Polished Stone Value (PSV) test. However, the PSV test has been acknowledged to have certain limitations, and hence there are alternative laboratory tests that have been developed to replace the PSV test. In this research, two alternative laboratory tests were analysed, namely the Wehner/Schulze (WS) test and the Auckland Pavement Polishing Device (APPD) test (which is used in conjunction with the Dynamic Friction Tester (DFT)) to produce a more accurate assessment of skid resistance of aggregates or road surfaces. There are eight different New Zealand aggregates used in this research, which consist of three Greywacke, two Basalt, one Andesite and two artificial aggregates. This research explored four main areas, namely the mineralogy of aggregates, the laboratory tests, the historical infield skid resistance evolution and the microtexture evolution due to polishing. The research findings suggest that the APPD-DFT or the WS tests are better than the PSV test method in predicting the aggregates’ resistance to polishing, as they are more sensitive to polishing differences and that they are less reliant on the operator. A methodology has also been developed to convert the skid resistance test results generated by either the APPD-DFT test or the WS test to the in-field skid resistance as measured by the SCRIM+. Even though the APPD-DFT and the WS tests cannot predict the exact long term in-field skid resistance value of aggregates at different stage of polishing, but those tests can provide a global prediction of how the in-field skid resistance of an aggregate will perform under certain traffic conditions. The mineralogy of aggregates were also assessed by using the X-Ray Diffraction and Thin Section methods and two mineralogy parameters, Cd and dmp, were calculated to characterise the effect of mineral hardness on skid resistance. The Cd parameter represents the difference in mineral hardness in the aggregate, while the dmp parameter represents the average hardness of the minerals in the aggregate. It was found that there is a strong relationship between the skid resistance slope and the Cd parameter, which suggests that aggregates containing minerals with various hardness levels are less susceptible to polishing action, which is shown by the small skid resistance slope. The thesis also presents the early stages of research on how the skid resistance can be predicted through a contactless method, i.e. by quantifying microtexture changes throughout the polishing process. Five parameters characterising the microtexture were explored, namely the height root-mean-square Rq, the asperity-peak curvature, two angular parameters characterising the asperity sharpness and relief, and the peak density. It was found that the curvature parameter can be well correlated to skid resistance. The Rq parameter was also found to have a relationship with skid resistance evolution, but to a lesser extent than the curvature, while the sharpness, relief and peak density parameters cannot be used to explain the surface friction variation because of newly created asperities during the polishing process due to aggregate abrasion. In summary, the work presented herein has added some improvements to the research in skid resistance area, especially in the attempt to predict skid resistance. The improvements include: · Giving a recommendation on alternative laboratory test methodologies that can be used to provide in-field skid resistance performance prediction; · Introducing a new methodology to predict the global trend of the long term in-field skid resistance performance based on the laboratory test results; and · Developing a new methodology in characterizing microtexture of aggregates to be related to skid resistance.
Download or read book Long Term Validation of an Accelerated Polishing Test Procedure for HMA Pavements written by Robert Y. Liang and published by . This book was released on 2013 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ohio Department of Transportation (ODOT) has set strategic goals to improve driving safety by maintaining smooth pavement surfaces with high skid resistance. ODOT has taken the initiative to monitor pavement friction on Ohio roadways and remedy the pavement sections with low skid resistance. However, this is a passive and reactive approach toward the problem. A more proactive approach would be to test hot mix asphalt (HMA) in the laboratory during the mix design stage to ensure that the aggregates used will provide adequate friction over the life of the pavement. With the validity of a research-grade polishing machine established in a previous study, ODOT has initiated this project to conduct a long-term field study to collect field performance data over a longer time period. The research effort was aimed at further validating the applicability of the previously developed laboratory test protocol and acceptance criteria through a correlation and comparison study with long-term field performance data. This research has produced the following deliverables: (a) a new commercial grade accelerated polishing machine called "The Polisher," (b) models for predicting the field performance of asphalt pavement friction under traffic, and (c) supplemental notes with draft specifications for polishing HMA samples and for testing friction properties. The commercial grade polishing machine and the supplemental notes were recommended for ODOT implementation.
Download or read book Polishing of Asphalt Pavements written by Xianhua Chen and published by . This book was released on 2015 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polishing of asphalt pavements and the consequent decreases of skid resistance are world-wide issues regarding vehicle traffic safety. This paper provided a detailed and up-to-date overview of skid resistance and polishing of asphalt pavements. It presented the latest long-term field survey results and discussed the characterization of pavement surface texture, skid resistance, and its evolution. It analyzed the mechanism of polishing and discussed the state-of-the-practice for testing pavement friction. It also discussed the primary principles for an accelerated polishing test in the laboratory. It is suggested that an integral analysis from macro- to micro-scale will be required for better understanding of the behaviors of aggregates and their mineral components in polishing process, and also for recognizing the critical material-dependent factors that determine the skid resistance level of asphalt mixture and the decreasing rate of skid resistance due to tire polishing.
Download or read book Laboratory Pavement Polishing Device wear Machine Vs Field Friction Test Unit written by H. F. Godwin and published by . This book was released on 1978 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Continuing Investigation of Polishing and Friction Characteristics of Limestone Aggregates in Ohio written by Robert Y. Liang and published by . This book was released on 2009 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to increased focus on maintaining highway operating safety and reducing wet weather accidents, the Ohio Department of Transportation has initiated a research to develop a laboratory scale accelerated polishing device that can mimic the actual abrasion and polishing actions between the vehicle rubber tires and the HMA (Hot Mix Asphalt) surface.
Download or read book Laboratory Pavement Polishing Device wear Machine Versus Field Friction Test Units and Accumulative Average Daily Traffic ADT written by and published by . This book was released on 1981 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paving Materials and Pavement Analysis written by American Society of Civil Engineers and published by Amer Society of Civil Engineers. This book was released on 2010 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement Design And Paving Material Selection are important for efficient, cost effective, durable, and safe transportation infrastructure Paving Materials and Pavement Analysis contains 73 papers examining bound and unbound material characterization, modeling, and performance of highway and airfield pavements. The papers in this publication were presented during the GeoShanghal 2010 International Conference held in Shanghai, China, June 3-5, 2010.
Download or read book Methods for Assessing the Polishing Characteristics of Coarse Aggregates for Use in Pavement Surface Layers written by Linbing Wang and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The predominant aggregate resources located in the western parts of Virginia are carbonate rocks. The mineral components of these rocks tend to be relatively soft and subject to abrasive wear under traffic that leads to a fairly rapid smoothing of the aggregate surface and the surface of pavements containing them. This smoothing or polishing leads to a loss of surface friction and thus skid resistance of the pavement, creating potential safety issues. As a consequence, surface courses of pavements are constructed with nonpolishing aggregates, which in the western districts can mean lengthy transport of materials. With rising economic and environmental costs associated with transportation, increasing the use of locally available materials through improved methods to discern subtle differences in polishing tendencies or blending of polishing with nonpolishing aggregates could translate into significant cost savings. In this study, a suite of carbonate aggregates suspected to show a range of polishing characteristics based on previous studies was selected for evaluation along with several sources currently used as nonpolishing aggregates. The aggregates were examined petrographically, and the carbonate sources were tested for insoluble residue and subjected to a dilute acid etch to form the basis for a tentative classification of polishing susceptibility. The aggregates were tested in the Micro-Deval apparatus using both the standard procedure for coarse aggregates and a cyclical A/P procedure with silica sand devised for this study to examine how the various aggregate types responded when subjected to various degrees of wearing under similar conditions. Following abrasion cycles, 2-D digital aggregate images were obtained and analyzed using specialized software to assess their morphological properties with emphasis on angularity and surface texture. These properties were assessed before and after abrasion to determine the degree and rate of change in surface texture as well as the texture distribution within an aggregate sample. In addition, pictures were taken of the exposed surfaces of three experimental pavement sections in the Virginia Department of Transportation's Bristol District containing carbonate rock as the fine aggregate blended with nonpolishing coarse aggregate to visually assess the effect of traffic in the last 3 years. The carbonate rocks evaluated could be grouped according to polishing and wear tendency based on petrographic characteristics and mass loss in the Micro-Deval tests. Although visual distinctions could be discerned, these differences were not identified statistically by the image analysis program, but factors affecting the program were identified. A second phase of work is proposed that focuses on developing an accelerated pavement wearing protocol for assessing polishing tendencies and evaluating various mixtures of carbonate and nonpolishing aggregates.
Download or read book Evaluating the Polishing Properties of Aggregates and Bituminous Pavement Surfaces by Means of the Penn State Reciprocating Polishing Machine written by S. Isozaki and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the polishing properties of coarse aggregates and bituminous pavement mixtures were investigated by means of the Penn State Reciprocating Polishing Machine. The test results were evaluated by BPN5000, which is the measured British Pendulum Number (BPN) after 5000 polishing passes of a rubber pad using alumina (35 ?m) abrasive. Aggregate mineral hardness was measured by the Shore Hardness Testing Machine.
Download or read book Design Building and Testing of a Portable Polishing Machine for Pavement Evaluation written by Gary C. Marshall and published by . This book was released on 1972 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Polished Stone Value of Aggregates and In service Skidding Resistance written by P. G. Roe and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Polishing of Pavement Cores and Comparison with Field Performance written by Rudolph Reuven Hegmon and published by . This book was released on 1972 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Polishing of Roadstone in Relation to the Resistance to Skidding of Bituminous Road Surfacings written by D. J. Maclean and published by . This book was released on 1958 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
