Migration of fines in 0–20 mm crushed base during placement, compaction, and seepage under laboratory conditions

Abstract

The rate of deterioration of gravel base course materials may influence the durability of flexible pavements. In particular, selected gradation curves usually satisfy filter criteria thus avoiding migration of fines from one layer (subgrade, base, and subbase) into adjacent one. This paper shows that even if filter criteria are met between successive layers, some 0–20 mm materals do not satisfy the fines mobility criteria that presently are not considered in gradation criteria. This means that fines ( Key words: road, gravel base course, segregation, suffossion, seepage, gradation.