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
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/35197 |
| Date | 13 December 1994 |
| Creators | Kliewer, Julie E. |
| Contributors | Bell, Chris A. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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