Evaluation Of Hot Mix Asphalt Macro And Microtexture
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| Author | : M. Stroup-Gardiner |
| Publisher | : |
| Total Pages | : 10 |
| Release | : 2004 |
| Genre | : Asphalt pavement |
| ISBN | : |
Pavement macrotexture is considered the primary factor in skid resistance at speeds over 65 km/h (40 mph). A total of 18 projects (9 Superpave and 9 Marshall mix designs) were evaluated to determine if the macrotexture of the pavement surface was influenced by gradation changes associated with the move to Superpave mix designs. The Federal Highway Administration ROSAN high-frequency laser system was used to measure macrotexture. Changes in microtexture, also a factor in skid resistance, were evaluated using a British Pendulum (BP) tester to determine the BP numbers of laboratory-compacted samples. Results indicated that the macrotexture did not change as a result of changes in mix design practices. The nominal maximum size of aggregate seemed to be the key factor in change in pavement surface macrotexture. Mixes, either Superpave or Marshall, with a nominal maximum size 9.5 mm or 12.5 mm have macrotextures of less than 0.5 mm. Based on information in the literature, the skid resistance for these Alabama pavements was estimated at 40 or higher.
| Author | : Kevin K. McGhee |
| Publisher | : |
| Total Pages | : 42 |
| Release | : 2003 |
| Genre | : Flatness measurement |
| ISBN | : |
This study introduces Virginia's efforts to apply high-speed texture measurement as a tool to improve the uniformity of hot-mix asphalt (HMA) pavements. Three approaches for detecting and quantifying HMA segregation through measuring pavement surface macrotexture were evaluated: (1) applying the methods proposed in NCHRP Report 441, which build on the ability to predict the expected "non-segregated" macrotexture; (2) using acceptance bands for texture similar to those used for HMA density; and (3) considering the standard deviation of the macrotexture as a measure of construction uniformity. Based on the findings from a series of field tests, the researchers concluded that macrotexture measurement holds great promise as a tool to detect and quantify segregation for quality assurance purposes. None of the available equations for predicting non-segregated macrotexture (the approach in NCHRP Report 441) was found to work for all the construction projects evaluated. Additional information is necessary to establish target macrotexture levels. The acceptance bands approach produced reasonable results in most of the field-verification experiments, but it was significantly influenced by the actual variability within the section. An approach that used target levels of standard deviations was selected for further testing and implementation on a pilot basis
| Author | : Douglas E. Knoll |
| Publisher | : |
| Total Pages | : 132 |
| Release | : 1999 |
| Genre | : Pavements |
| ISBN | : |
| Author | : |
| Publisher | : AASHTO |
| Total Pages | : 87 |
| Release | : 2008 |
| Genre | : Pavements |
| ISBN | : 1560514280 |
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.
| Author | : |
| Publisher | : Transportation Research Board |
| Total Pages | : 285 |
| Release | : 2011 |
| Genre | : Asphalt concrete |
| ISBN | : 0309155649 |
| Author | : Randy Clark West |
| Publisher | : Transportation Research Board |
| Total Pages | : 162 |
| Release | : 2013 |
| Genre | : Pavements, Asphalt |
| ISBN | : 0309259134 |
TRB's National Cooperative Highway Research Program (NCHRP) Report 752: Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content describes proposed revisions to the American Association of State Highway and Transportation Officials (AASHTO) R 35, Superpave Volumetric Design for Hot Mix Asphalt, and AASHTO M 323, Superpave Volumetric Mix Design, to accommodate the design of asphalt mixtures with high reclaimed asphalt pavement contents.
| Author | : John Jewett Henry |
| Publisher | : Transportation Research Board |
| Total Pages | : 76 |
| Release | : 2000 |
| Genre | : Technology & Engineering |
| ISBN | : 9780309068741 |
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.
| Author | : R. Christopher Williams |
| Publisher | : |
| Total Pages | : 138 |
| Release | : 2010 |
| Genre | : Pavements, Asphalt |
| ISBN | : |
Pavements are subjected to different stresses during their design lives. A properly designed pavement will perform adequately during its design life, and the distresses will not exceed the allowable limits; however, there are several factors that can lead to premature pavement failure. One such factor is moisture sensitivity. AASHTO T 283 is the standard test used in the moisture susceptibility evaluation of asphalt mixtures, but the results of the test are not very representative of the expected behavior of asphalt mixtures. The dynamic modulus test measures a fundamental property of the mixture. The results of the dynamic modulus test can be used directly in the Mechanistic-Empirical Pavement Design Guide (MEPDG) and are considered a very good representation of the expected field performance of the mixture. Further research is still needed to study how the dynamic modulus results are affected by moisture. The flow number test was studied in previous research as a candidate test for moisture-susceptibility evaluation, but the results of that research were not favorable. This research has four main objectives. The first objective of this research is to evaluate the usefulness of the dynamic modulus and flow number tests in moisture-susceptibility evaluation. The second objective is to compare the results to those achieved using the AASHTO T 283 test. The third objective is to study the effect of different methods of sample conditioning and testing conditions. The fourth objective of the research is to study the variability in the test results.
| Author | : Louay Nadhim Mohammad |
| Publisher | : ASTM International |
| Total Pages | : 216 |
| Release | : 2006 |
| Genre | : Anisotropy |
| ISBN | : 0803134959 |
| Author | : |
| Publisher | : ASTM International |
| Total Pages | : 204 |
| Release | : |
| Genre | : |
| ISBN | : |
