3
The compression modulus
)(
tD
can be determined as follows
)
1
(
)(
)(
2
t
tD
where
)(
t
is the true stress at time t and
1
2
is Cauchy’s deformation.
where
is the compression ratio,
0
h
h
t
.
and
vt
h h
t
0
where
t
h
is the height (mm) at time t,
0
h
is the initial height (mm),
v
is the speed of the compression (mm/min) and
t
is the time (min) or (sec).
Results and Discussion
- Effect of aggregate size
The effects of aggregate size on the compression properties of natural rubber - asphalt - aggregate blends.
The results are shown in Figures 1 – 6.
Figure 1
Stress
-
Cauchy’s deformation, aggregate diameter of 4.75 - 9.50 mm (Small, S), 9.50 - 12.50 mm (Medium,
M) and 12.50 - 19.00 mm (Large, L), the amount of natural rubber (Rubber, R) 0 % wt, the speed of the compression
(Speed) at 50 mm/min and the time at 0 min for mastication (Masticate).
