College :
L.D.COLLEGE OF ENGINEERING,
AHMEDABAD - 380015,
GUJARAT
Stone Matrix Asphalt (SMA) is a gap graded mix, characterized by high coarse aggregates,
high asphalt contents and polymer or fibre additives as stabilizers. High concentration of
coarse aggregate maximizes stone-to-contact and interlocking in the mix which provides
strength, and the rich mortar binder provides durability. The stabilizing additives composed
of cellulose fibres, mineral fibres or polymers are added to SMA mixtures to prevent
draindown from the mix. In comparison to dense graded mixtures SMA has higher proportion
of coarse aggregate, lower proportion of middle size aggregate and higher proportion of
mineral filler. It resists permanent deformation and has the potential for long term
performance and durability.
In the present study, an attempt has been made to study the engineering properties of
mixtures of stone matrix asphalt made with one type of binder namely conventional bitumen
60/70, with a non-conventional natural fibre, namely coconut fibre and jute fibre. The binders
and fibres in different proportions are used for preparation of mixes with a selected aggregat
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