Summary Report on Aging of Asphalt-aggregate Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Summary Report on Aging of Asphalt-aggregate Systems write by Chris A. Bell. This book was released on 1989. Summary Report on Aging of Asphalt-aggregate Systems available in PDF, EPUB and Kindle. 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.
Summary Report on Aging of Asphalt-Aggregate Systems
Summary Report on Aging of Asphalt-Aggregate Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Summary Report on Aging of Asphalt-Aggregate Systems write by . This book was released on 1989-06-01. Summary Report on Aging of Asphalt-Aggregate Systems available in PDF, EPUB and Kindle.
Selection of Laboratory Aging Procedures for Asphalt-aggregate Mixtures
Selection of Laboratory Aging Procedures for Asphalt-aggregate Mixtures - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Selection of Laboratory Aging Procedures for Asphalt-aggregate Mixtures write by C. A. Bell. This book was released on 1994. Selection of Laboratory Aging Procedures for Asphalt-aggregate Mixtures available in PDF, EPUB and Kindle. 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.
Laboratory Aging of Asphalt-aggregate Mixtures
Laboratory Aging of Asphalt-aggregate Mixtures - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Laboratory Aging of Asphalt-aggregate Mixtures write by Chris A. Bell. This book was released on 1994. Laboratory Aging of Asphalt-aggregate Mixtures available in PDF, EPUB and Kindle. 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.
Aging
Aging - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Aging write by Chris A. Bell. This book was released on 1994. Aging available in PDF, EPUB and Kindle. 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. 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 the 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.
