INVESTIGATING RUTTING PERFORMANCE OF FOAMED COLD-MIX ASPHALT UNDER SIMULATED TRAFFICKING
ABSTRACT: A trial
section of a
foamed cold mix asphalt
(FCMA) pavement was constructed
and investigated under
simulated trafficking in the
Pavement Test Facility
(PTF). A combination
of crushed limestone
and reclaimed asphalt
pavement (RAP) aggregates with
selected binder was
used to simulate
recycled construction. Trafficking
was carried out at an approximate velocity
of 3 km/hr
for various applied single wheel load
applications. The results have
provided preliminary indication of rutting resistance characteristics of
foamed asphalt material. The rutting performance depends on the mixture
proportion, binder type and the presence of cement. It was found that foamed
bitumen bound mixtures that contained a
higher proportion of
RAP and a
softer binder exhibited
greater deformation. The effect
of mix proportions and
penetration grade of
the binder on rutting
was more pronounced
during early life
and at low
loads, but when
the mixture was subjected
to higher loads,
this effect was
less significant. It
was also well
observed that the use
of small amount of cement can
accelerate the curing process and significantly reduced the measured rutting.
Author: Sri Sunarjono
Journal Code: jptsipilgg090012
