A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of Laboratory Procedures for Compacting Asphalt-Aggregate Mixtures
The study examined three laboratory compaction methods (Texas gyratory, kneading, and rolling wheel). Unlike static and impact compactors, these compactors subject the densifying mixture to shearing motions similar to those induced during field compaction. During compaction, the three compactors may differ most in the stress applied to the aggregate particles and in the magnitude and randomness of interparticle displacements. A greater effective stress promotes more interparticle contact, and larger and more random displacement promote a tightly interlocked aggregate structure. Under gyratory compaction, the effective stress can be relatively low due to pore pressures building up in the fluid (asphalt and air voids) phase, and the interparticle shearing motion is relatively small and uniform. The net result is a relatively 'weak' aggregate structure. Differences among the compaction methods are greatest for mixtures with low air voids, presumably because pore pressures are larger when there are fewer air voids in the mixture. Notwithstanding these generalities, it also appears that, depending on their design and operation, compactors within a given genre may produce specimens having quite different engineering properties.
Evaluation of Laboratory Procedures for Compacting Asphalt-Aggregate Mixtures
The study examined three laboratory compaction methods (Texas gyratory, kneading, and rolling wheel). Unlike static and impact compactors, these compactors subject the densifying mixture to shearing motions similar to those induced during field compaction. During compaction, the three compactors may differ most in the stress applied to the aggregate particles and in the magnitude and randomness of interparticle displacements. A greater effective stress promotes more interparticle contact, and larger and more random displacement promote a tightly interlocked aggregate structure. Under gyratory compaction, the effective stress can be relatively low due to pore pressures building up in the fluid (asphalt and air voids) phase, and the interparticle shearing motion is relatively small and uniform. The net result is a relatively 'weak' aggregate structure. Differences among the compaction methods are greatest for mixtures with low air voids, presumably because pore pressures are larger when there are fewer air voids in the mixture. Notwithstanding these generalities, it also appears that, depending on their design and operation, compactors within a given genre may produce specimens having quite different engineering properties.
Evaluation of Laboratory Procedures for Compacting Asphalt-Aggregate Mixtures
J. B. Sousa (author) / J. Harvey (author) / L. Painter (author) / J. A. Deacon (author) / C. L. Monismith (author)
1991
264 pages
Report
No indication
English
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