Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement Layers




SUMMARY

Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement Layers

Unbound pavement layers in flexible and rigid pavements generally serve to provide (1) a

working platform, (2) structural layers for the pavement system, (3) drainage layers, (4) frostfree

layers, and (5) select fill material (sometimes as part of the working platform). The properties

of recycled aggregates (recycled asphalt pavement [RAP] and recycled concrete

pavement

[RCP]) greatly influence their performance as unbound granular pavement layers.

Failure of an unbound pavement layer results in pavement distresses. Fatigue cracking,

rutting/corrugations, depressions, and frost heave of flexible pavements are distresses (performance

parameters) that can result from poor performance of aggregate in unbound base

and

subbase layers. Similarly, cracking, pumping/faulting/loss of support, frost heave, and

erosion

in rigid pavements can result from poor performance of subbase layers.


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