Laboratory Aging of Asphalt-Aggregate Mixtures
| Author | : C. A. Bell |
| Publisher | : |
| Total Pages | : 204 |
| Release | : 1994-04-01 |
| Genre | : |
| ISBN | : 9780309057707 |
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Laboratory Aging of Asphalt-aggregate Mixtures
| Author | : Chris A. Bell |
| Publisher | : Strategic Highway Research Program (Shrp) |
| Total Pages | : 228 |
| Release | : 1994 |
| Genre | : Technology & Engineering |
| ISBN | : |
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The hardening or stiffening associated with heating asphalt is referred to as aging and occurs in two stages: short-term aging, which occurs during mixture mixing and placement, and long-term aging, which occurs throughout the life of the pavement. A portion of the Strategic Highway Research Program has been dedicated to developing accelerated performance tests for aging asphalt mixtures. Two test procedures developed at the Oregon State University utilize oven aging at 135 deg C and 85 or 100 deg C to simulate short- and long-term field aging. This report presents the results of the field validation of these two procedures.
Selection of Laboratory Aging Procedures for Asphalt-aggregate Mixtures
| Author | : C. A. Bell |
| Publisher | : Strategic Highway Research Program (Shrp) |
| Total Pages | : 106 |
| Release | : 1994 |
| Genre | : Technology & Engineering |
| ISBN | : |
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Two major effects dominate aging of asphalt-aggregate mixtures: 1) loss of volatile components and oxidation in the construction phase (short-term aging) and 2) progressive oxidation of the in-place mixture in the field (long-term aging). Aging results in hardening (stiffening) of a mixture, which alters its performance both positively and negatively. This report presents the results of a preliminary investigation to evaluate aging methods for asphalt-aggregate mixtures. Short-term methods included oven aging and extended mixing, while long-term methods included oven aging and oxygen enrichment. The effects of temperature and aging duration are presented. The effects of aging were determined using the diametral resilient modulus test. Recommendations for short- and long-term aging are provided.
Summary Report on Aging of Asphalt-aggregate Systems
| Author | : Chris A. Bell |
| Publisher | : |
| Total Pages | : 128 |
| Release | : 1989 |
| Genre | : Aggregates (Building materials) |
| ISBN | : |
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This is a report on the state of the art of research on the phenomenon of the aging of asphalt-aggregate mixtures. Compared to research on the aging of asphalt cement, there has been little research on the aging of asphalt mixtures. Binder studies are considered as well as mixture sutdies, the relationship between laboratory aging tests and field performance, and the relationship between chemical composition and field performance. Recommendations are made for aging procedures which show promise for laboratory investigation. Test methods to evaluate aging are also considered. It is noted that extended heating procedures show the most promise for short-term aging and pressure oxidation and/or extended heating the most promise for long-term aging.
Field Validation of Laboratory Aging Procedures for Asphalt Aggregate Mixtures
| Author | : |
| Publisher | : |
| Total Pages | : 36 |
| Release | : 1994 |
| Genre | : |
| ISBN | : |
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Laboratory Evaluation of Aging for Asphalt-aggregate Mixtures
| Author | : Dan Sosnovske |
| Publisher | : |
| Total Pages | : 248 |
| Release | : 1994 |
| Genre | : Asphalt |
| ISBN | : |
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This research was conducted as part of the Strategic Highway Research Program (SHRP) A-003A contract at Oregon State University to validate the findings of SHRP contracts A-002A and A-003B with regard to aging of asphalt-aggregate mixtures. One short-term and four long-term aging methods were used to simulate aging of asphalt-aggregate mixes in the field. Four aggregates and eight asphalts for a total of 32 different material combinations were tested using different aging methods. Results of the aging studies are compared with the A-002A and A-003B studies of asphalt binder or asphalt mixed with fine aggregate. This research concludes that aging of asphalt mixes cannot be predicted by tests on asphalt binder alone since results show that aggregates have considerable influence on aging.
Relating Asphalt and Aggregate Properties and Their Laboratory Aging to Field Performance of Asphalt Mixtures
| Author | : Chris A. Bell |
| Publisher | : |
| Total Pages | : 18 |
| Release | : 1994 |
| Genre | : |
| ISBN | : |
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Investigation of the Relationship Between Field Performance and Laboratory Aging Properties of Asphalt Mixtures
| Author | : CA. Bell |
| Publisher | : |
| Total Pages | : 18 |
| Release | : 1995 |
| Genre | : Aging |
| ISBN | : |
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Short- and long-term aging procedures were developed at Oregon State University under the Strategic Highway Research Program (SHRP) A-003A project. Several alternative methods for short- and long-term aging of asphalt-aggregate were examined. These were subjected to extensive laboratory and field validation test programs. Laboratory validation was done with an extensive testing program using 8 asphalts and 4 aggregates. Field validation utilized 20 test sites and compared the modulus of field aged and laboratory aged specimens.
Short-term Laboratory Conditioning of Asphalt Mixtures
| Author | : David Newcomb |
| Publisher | : |
| Total Pages | : 196 |
| Release | : 2015 |
| Genre | : Asphalt |
| ISBN | : |
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This report develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning of Hot-Mix Asphalt (HMA), and a proposed AASHTO practice for conducting plant aging studies. The report will be of immediate interest to materials engineers in state highway agencies and the construction industry with responsibility for design and production of hot and warm mix asphalt.
Long-term Aging of Asphalt Mixtures for Performance Testing and Prediction
| Author | : Y. Richard Kim |
| Publisher | : |
| Total Pages | : 104 |
| Release | : 2018 |
| Genre | : Pavements, Asphalt |
| ISBN | : 9780309446839 |
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