Thesis (Ph. D.)--Carleton University, 2003. / Includes bibliographical references (p. 138-146). Also available in electronic format on the Internet.

Thesis (M.S.)--Brigham Young University. Dept. of Civil and Environmental Engineering, 2006. / Includes bibliographical references (p. 43-46).

No description available.

The main goal of this study consists of the development of new asphalt mixes, based on industrial waste materials as replacement of natural aggregates. To achieve this purpose, a new characterisation of these pavements was proposed so to verify that the new mix has good mechanical performance without any detrimental impact to the environment. This characterisation was divided in three distinct steps: • a physical and chemical characterisation of the different constituents of asphalt concrete, as well the natural materials as the industrial waste considered as potentially secondary aggregates, • a study of the bitumen-aggregate interface by means of two techniques: a qualitative method (scanning electron microscope) and a quantitative one (nanoindentation) • an evaluation of the mechanical performance of mixes containing industrial waste, before and after recycling, by means of four standard road-engineering tests. The numerous results allowed to put in evidence the possibility to reuse some industrial waste materials in asphalt concrete. In addition, this characterisation containing both chemical and mechanical aspects, at the microscopic and macroscopic scales, would permit the transposition of this study to the whole of asphalt concrete./ Le principal objectif de ce travail consiste en le développement de nouveaux mélanges bitumineux utilisant des déchets industriels en tant que remplacement des matériaux naturels. Pour ce faire, une nouvelle caractérisation de ces revêtements a été proposée afin de vérifier que le nouveau revêtement obtenu présente de bonnes performances mécaniques tout en évitant un impact environnemental néfaste. Cette caractérisation a été scindée en trois étapes distinctes : • une caractérisation physique et chimique des différents constituants de l’enrobé bitumineux, à savoir les granulats naturels mais également les déchets industriels, candidats en tant que matériaux secondaires, • une étude de l’interface bitume-granulat et ce, au moyen de deux techniques : une méthode qualitative (microscope électronique à balayage)et une méthode quantitative (nanoindentation), • une évaluation des performances mécaniques des mélanges comportant des déchets industriels avant et après recyclage et ce, au moyen de quatre tests usuels de l’ingénierie routière. Les nombreux résultats obtenus ont permis de mettre en évidence la possibilité de valoriser certains déchets industriels dans les enrobés bitumineux. De plus, la mise en place d’une caractérisation comportant des aspects chimiques et mécaniques, à la fois à l’échelle microscopique et macroscopique, permettra la transposition de cette étude à l’ensemble des enrobés bitumineux.

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In 1987, Congress authorized a 5 year $150 million dollar research program called the Strategic Highway Research Program (SHRP). SHRP was divided into four major areas, including the asphalt research program. The asphalt research program was divided into six major research contracts, one such contract, SHRP-003A was called Performance Related Testing and Measuring of Asphalt Aggregate Interaction and Mixtures. Oregon State University performed the portion of this contract related to the development and validation of accelerated test procedures for aging, low temperature cracking, and moisture sensitivity of asphalt-aggreagte mixtures. This thesis contains five independent papers that discuss elements of the development, validation, and or implementation of these accelerated test procedures. In the first paper, the relationship between field performance and laboratory aging properties of asphalt-aggregate mixtures is discussed, including the relative importance of asphalt binder and aggregate type on the amount of aging experience. Based on this work recommended aging procedures are presented to simulate different environmental conditions and pavement age. The second paper makes use of the large body of resilient modulus data conducted as part of the SHRP research effort to compare data obtain in the diametral and the triaxial mode. It is not possible to give a relationship between triaxial and diametral resilient modulus, without describing specimen geometry and other test conditions. The third paper discusses the effect of aging on the thermal cracking properties of asphalt-aggregate mixtures. The temperature at which aging occurs affects the way cold temperature fracture properties change with time. Low temperatures result in quenching of the aging process, while high temperatures result in continued aging. The fourth paper discusses work conducted in association with the Oregon Department of Transportation to extend the environmental conditioning system (ECS) test procedure for moisture assessment to open graded mixtures. Comparison in the ECS of mixtures with and without anti-strip agents added indicates that they don't always decrease moisture damage potential. The final paper presents a discussion of asphalt chemistry and its relationship to asphalt-aggregate mixture performance. Using the SHRP asphalt model, aging and low temperature performance data collected at Oregon State University is explained. / Graduation date: 1995

The transportation infrastructure systems in the United States were built between the 50's and 80's, with 20 years design life. As most of them already exceeded their original life expectancy, state transportation agencies (STAs) are now under increased needs to rebuild deteriorated transportation networks. For major highway maintenance projects, a federal rule enforces to perform a life-cycle cost analysis (LCCA). The lack of analytical methods for LCCA creates many challenges of STAs to comply with the rule. To address these critical issues, this study aims at developing a new methodology for quantifying the future maintenance cost to assist STAs in performing a LCCA. The major objectives of this research are twofold: 1) identify the critical factors that affect pavement performances; 2) develop a stochastic model that predicts future maintenance costs of flexible-type pavement in Texas. The study data were gathered through the Pavement Management Information System (PMIS) containing more than 190,000 highway sections in Texas. These data were then grouped by critical performance-driven factor which was identified by K-means cluster analysis. Many factors were evaluated to identify the most critical factors that affect pavement maintenance need. With these data, a series of regression analyses were carried out to develop predictive models. Lastly, a validation study with PRESS statistics was conducted to evaluate reliability of the model. The research results reveal that three factors, annual average temperature, annual precipitation, and pavement age, were the most critical factors under very low traffic volume conditions. This research effort was the first of its kind undertaken in this subject. The maintenance cost lookup tables and stochastic model will assist STAs in carrying out a LCCA, with the reliable estimation of maintenance costs. This research also provides the research community with the first view and systematic estimation method that STAs can use to determine long-term maintenance costs in estimating life-cycle costs. It will reduce the agency's expenses in the time and effort required for conducting a LCCA. Estimating long-term maintenance cost is a core component of the LCCA. Therefore, methods developed from this project have the great potential to improve the accuracy of LCCA.

The underlying purpose of any pavement is to provide a safe, smooth and reliable surface for the intended users. In the case of hot mix asphalt (HMA) pavements, this includes producing a surface that is resistant to the principal HMA distress types: permanent deformation (or rutting) and fatigue damage (or cracking). To protect better against these distress types, there have recently been changes in HMA mixture design practice. These changes have had the positive effect of producing more damage resistant mixtures but have also had the effect of producing mixtures that require more compaction effort to obtain required densities. It is important to understand what properties of an HMA mixture contribute to their compactability. This study presents analysis of the correlation between HMA mixture properties and laboratory compaction parameters for the purpose of predicting compactability. Mixture property data were measured for a variety of mixtures; these mixtures were compacted in the laboratory and compaction parameters were collected. A statistical analysis was implemented to correlate the mixture data to the compaction data for the purpose of predicting compactability. The resulting model performs well at predicting compactability for mixtures that are similar to the ones used to make the model, and it reveals some mixture properties that influence compaction. The analysis showed that the binder content in an HMA mixture and the slope of the aggregate gradation curve are important in determining the compactability of a mixture.

Thesis (Ph. D.)--University of Tennessee, Knoxville, 2003. / Title from title page screen (viewed Sept. 26, 2003). Thesis advisor: Eric C. Drumm. Document formatted into pages (xx, 249 p. : ill. (some col.)). Vita. Includes bibliographical references.

No description available.