The assessment of suitability of oil shale aggregates for use in bituminous mixes

Abstract EN

The assessment of the suitability of El-Lajjiin oil shale rocks as aggregaies in hot bituminous mixes for use in layers of flexible pavements is reported.

Crushed ا؛ه shale particles are angular, sharp cornered, highly absorbant, light weight and have a rough surface texture.

Aggregates mined from the upper 20 m of the open pit are less absorbant, higher in specif!،: gravity and more resistant to abrasion and crushing ذا those mined from lower layers.

Only those upper aggregates are conforming to requirement for hot bituminous mixes and only mixes employing these aggregates conform to required specifications with regard to stability، Marshall flow, air voids and voids in the mineral aggregates.

Produced mixes are light in weight and they exhibited stability values ranging from 6.5—9.5 K.N.

Full scale trial strips of the investigated bitmtiinous mixes should be constructed on roads in order to evaluate their performance under actual traffic and environmental conditions.