TENSILE STRENGTH AND STIFFNESS MODULUS OF FOAMED ASPHALT APPLIED TO A GRADING REPRESENTATIVE OF INDONESIAN ROAD RECYCLED PAVEMENT MATERIALS
ABSTRACT: Saving energy and
sustainable construction are becoming important issues in pavement engineering.
These issues constitute a strong incentive towards the use of foamed asphalt
technology worldwide. Unfortunately, there is no current research attempting
implementation of foamed
asphalt technology in
Indonesia. Therefore, this
paper contributes an important
figure of cold
recycling construction in
which a deteriorated
pavement with a
grading representative of Indonesian
road was stabilised
using foamed bitumen. The
specimens containing 2%
foamed bitumen were fabricated with diameter 100mm and
height 50mm. The specimens were cured at ambient temperature prior to tensile
strength and stiffness modulus testing
at various curing
period. The results have
provided preliminary indication
of foamed asphalt characteristics.
During curing period, the
properties can be
identified into 3 stages; (1) moisture dependent
region in which the tensile
strength and stiffness modulus increase with time due to loss of moisture, (2)
critical region in which the correlation between moisture and properties is not clear and affected by
temperature regime, and (3) ageing or loss of latent moisture
region in which
the properties is
predicted increase with
longer curing time.
The correlation between tensile strength
and stiffness modulus has
been established in
which its stiffness
(MPa) is about
4 times of
its strength (kPa).
Keywords: foamed asphalt, stiffness
modulus, tensile strength, moisture content, recycling, Indonesian road
Author: Sri Sunarjono
Journal Code: jptsipilgg070001
