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 Polished Stone Value of Aggregates and In Service Skidding Resistance written by P. G. Roe and published by Thomas Telford. This book was released on 1999-02-10 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: - Executive Summary - Introduction - Background - Studies of aggregate performance in-service - Discussion - implications of desk studies - Laboratory studies of polishing mechanism - Developing a revised standard - Proposed revision to HD28 - Further research - Conclusions - Acknowledgements - References - Appendix A: Laboratory studies of polishing mechanism - Appendix B: Comparison of PSV requirements in HD28/94 with proposed replacement - Abstract - Related publications
Download or read book The Skidding Resistance of Concrete written by R. E. Franklin and published by . This book was released on 1978 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selection of Aggregates for Skid Resistance written by P. D. Cenek and published by . This book was released on 2012 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistical modelling was undertaken to develop a means for reliably predicting the expected in-service skid resistance of any rural section of the New Zealand state highway network surfaced with chip seal. The measure of slow-speed skid resistance used was the sideways-force coefficient routine inspection machine (SCRIM) coefficients averaged over a 10m length. The statistical modelling was based on data from the 2006-2007 high-speed condition survey of the entire New Zealand state highway network, which amounts to a sealed length of 23,113 lane km. The resulting database contains a total of 976,338 observations allowing identification of statistically significant relationships between the dependent variable (the measured in-service skid resistance) and the independent variables (road geometry, traffic characteristics and aggregate characteristics). One aggregate-related variable investigated was a categorical parameter, representing the name of the quarry from which the aggregate was sourced. This parameter inherently encompasses not only polished stone value but all other important influencing factors such as chip shape, chip hardness, mineralogical properties and crusher type. The major finding was that the categorical variable 'aggregate source' is a better predictor of in-service skid resistance performance than the numeric variable 'polished stone value'.
Download or read book Polishing machine for road aggregates and skid resistance tester written by Centre de Recherches Routieres and published by . This book was released on 1980 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthetic Aggregates of High Resistance to Polishing written by J. R. Hosking and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Aggregates and Skid Resistance written by Kathleen T. Diringer and published by . This book was released on 1990 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predetermining the Polish Resistance of Limestone Aggregates written by W. Cullen Sherwood and published by . This book was released on 1971 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book PRO 28 6th International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials PTEBM 03 written by Manfred N. Partl and published by RILEM Publications. This book was released on 2003 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance and Durability of Bituminous Materials written by J.G. Cabrera and published by CRC Press. This book was released on 2003-09-02 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers new advances in materials and methods, particularly orientated towards the optimization of energy expenditure required for the preparation of aggregates, bituminous binders and bituminous mixtures and the implications which arise with regard to the European specifications and codes of practice.
Download or read book Asphalt Mixture Specification and Testing written by Cliff Nicholls and published by CRC Press. This book was released on 2017-05-12 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide reviews the way asphalt mixture can be specified, with particular emphasis on the test methods used to measure performance. The advantages and limitations of the tests are described for measuring the desired property, and engineers can specify a test according to the material’s use. The book starts with a resume of specifications and their relative advantages and disadvantages for different situations. Then different properties are discussed in terms of: their specification; the test methods that can be used (primarily the EN 12697 suite of European methods, of which the author has been responsible for drafting); the extent to which the results predict performance; the levels that can be achieved with different asphalt mixes and types; what levels, if any, should be specified in various situations and pavement layers; and which other properties are adversely affected by enhanced performance. The final section covers various aspects of sustainability, with a strong emphasis on durability. Better understanding should enable clients and consultants who specify pavements to produce durable asphalt pavements more economically, and also help asphalt producers and students trying to understand the black art of asphalt.
Download or read book Bituminous Mixtures in Road Construction written by Robert N. Hunter and published by Thomas Telford. This book was released on 1994 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Every year more than 30 million tonnes of bituminous mixtures are laid in the UK in the course of maintenance and improvements of the road network. However, much of the technology associated with road construction and maintenance has never been published - until now. Bituminous mixtures in road construction has been published as the definitive guide to blacktop and addresses the theoretical and practical aspects of the design, manufacture and laying of bituminous mixtures. Written by a team of leading experts, the book provides up-to-the-minute thinking in materials specification, test methods and harmonisation of standards and covers all aspects of fully flexible road construction from foundation design through to surface treatment. In one handy volume, Bituminous mixtures in road construction presents the best of British expertise and will prove to be an essential guide for all engineers working on the construction and maintenance of highways.
Download or read book Advances in Aggregates and Armourstone Evaluation written by John-Paul Latham and published by Geological Society of London. This book was released on 1998 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: The maintenance and upgrading of our built environment, including large sections of coastal defences, relies heavily on natural construction materials. The text aims to highlight a range of pressing research issues in natural construction materials of direct relevance to an industry facing growing pressures for environmental sustainability and standardization of product quality within Europe. Tests and specifications given in the forthcoming Eurostandards for aggregates and armourstones are considered and correlated with older more widely used tests, including those which could impact upon current road safety. This text should be useful to: aggregate and amourstone suppliers and users; civil and engineering geologists; quarry companies; and Local and County Authority engineers and coastal engineers.
Download or read book Proceedings of the Conference written by Australian Road Research Board and published by . This book was released on 1978 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Significance of Tests and Properties of Concrete and Concrete Making Materials written by C. H. Best and published by ASTM International. This book was released on 1985-02 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Geology and Geotechnics written by F. G. Bell and published by Elsevier. This book was released on 2013-10-22 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering Geology and Geotechnics discusses engineering survey methods. The book is comprised of 12 chapters that cover several concerns in engineering, such as building foundations, slopes, and construction materials. Chapter 1 covers site investigation, while Chapter 2 tackles geophysical exploration. Chapter 3 deals with slope and open excavation, while Chapter 4 discusses subsurface excavation. Foundation for buildings, reservoir, and dams and dam sites are also covered in the book. A chapter then tackles hydrogeology and underground water supply. The text also encompasses river and beach engineering. The last two chapters cover engineering seismology and construction materials. This book will be of great use to researchers, practitioners, and students of engineering.
