SYMPOSIA PAPER Published: 01 January 1960

A Test for Production of Plastic Fines in the Process of Degradation of Mineral Aggregates


Degradation of mineral aggregates, particularly in base courses under flexible paving mats, is a natural process that results from the kneading action of moving wheel loads. Over a period of time, heavy traffic will tend to produce not only a progressively finer aggregate grading than was initially placed in the base course but also an excess of fine material in the particle-size range of silt and bordering on that of clay. The results of such degradation of base-course aggregates are: (1) reduction of angularity and interlock of the courser particles and (2) some “lubrication” of the coarser particles by increasing amounts of fine material distributed through the aggregate under moist conditions. The net effect is to reduce the stability of the base course.

Author Information

Ekse, M
University of Washington, Seattle, Wash.
Morris, HC
University of Washington, Seattle, Wash.
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Developed by Committee: D04
Pages: 122–126
DOI: 10.1520/STP38776S
ISBN-EB: 978-0-8031-5600-5
ISBN-13: 978-0-8031-5599-2