Effect of Aggregate Angularity on Base Material Properties
Publication: Journal of Materials in Civil Engineering
Volume 16, Issue 6
Abstract
This paper summarizes the results of tests on the impact of aggregate angularity on the resilient modulus and shear strength of the base/subbase layers in a pavement structure. Tests conducted with large-scale samples ( in diameter) found that, at low bulk stress levels, the resilient modulus of 0% crushed (natural) material was higher than for 100% crushed mixture. This trend was reversed when the bulk stress was greater than . The void ratio also had an impact on the resilient modulus when the crushed content was 50% or less. It was also found that with standard -diameter samples, the resilient modulus was higher for the natural material than for 100% crushed material at all stress levels; it was also about higher than from the large-scale tests. From the standard samples, the angle of internal friction ranged between 41 and for void ratios around 0.22. For the large-scale samples for a void ratio around 0.16, the angle of internal friction was about . The particle index is a good indicator of the crushed (angular) content of a given base course. For all practical purposes, the particle index is not a good indicator of the resilient properties of the base course aggregate.
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Copyright © 2004 ASCE.
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Published online: Nov 15, 2004
Published in print: Dec 2004
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