Summary Report on Aging of Asphalt-aggregate Systems PDF Download
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Author: Chris A. Bell
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 128
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Book Description
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.
Author: Chris A. Bell
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 128
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Book Description
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.
Author:
Publisher:
ISBN: 9780685410226
Category :
Languages : en
Pages :
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Book Description
Author: C. A. Bell
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 106
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Book Description
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.
Author: Chris A. Bell
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 228
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Book Description
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.
Author: Chris A. Bell
Publisher:
ISBN:
Category : Social Science
Languages : en
Pages : 104
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 144
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Book Description
Author: University of California, Berkeley
Publisher: National Research Council
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 176
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Book Description
This report provides a brief summary of the processes that led to the selection of performance-related tests to define asphalt-aggregate interactions that result in fatigue, permanent deformation, thermal cracking, aging, and water sensitivity. Inherent in this test selection process was the emphasis on the ability of the tests to measure fundamental material properties that, when incorporated into prediction models, will depend less on empirical correlations than has been traditionally the case. Also included are the results of validation studies for each of the tests and frameworks for the use of the tests in mix design and analysis. Several levels of design are provided for each distress, some of which incorporate reliability concepts.
Author: National Research Council (U.S.). Transportation Research Board
Publisher:
ISBN:
Category : Transportation
Languages : en
Pages : 94
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Book Description
Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 148
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Book Description
Author: C. A. Bell
Publisher:
ISBN: 9780309057707
Category :
Languages : en
Pages : 204
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Book Description
