Stone matrix asphalt (SMA) mixtures rely on stone-on-stone contacts among
particles to resist applied forces and permanent deformation. Aggregates in SMA should
resist degradation (fracture and abrasion) under high stresses at the contact points. This
study utilizes conventional techniques as well as advanced imaging techniques to
evaluate aggregate characteristics and their resistance to degradation. Aggregates from
different sources and types with various shape characteristics were used in this study.
The Micro-Deval test was used to measure aggregate resistance to abrasion. The
aggregate imaging system (AIMS) was then used to examine the changes in aggregate
characteristics caused by abrasion forces in the Micro-Deval.
The resistance of aggregates to degradation in SMA was evaluated through the
analysis of aggregate gradation before and after compaction using conventional
mechanical sieve analysis and nondestructive X-ray computed tomography (CT). The
findings of this study led to the development of an approach for the evaluation of
aggregate resistance to degradation in SMA. This approach measures aggregate
degradation in terms of abrasion, breakage, and loss of texture.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/3342 |
| Date | 12 April 2006 |
| Creators | Gatchalian, Dennis |
| Contributors | Masad, Eyad |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 1443905 bytes, electronic, application/pdf, born digital |
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