8
Figure 12
Compression modulus (D (t)) - time, the speed of the compression (Speed) at 50, 150 and 250 mm/min, the
amount of natural rubber (Rubber, R) 11 % wt, aggregate size, diameter of 4.75 - 9.50 mm (Small, S) and the time at 0
min for mastication (Masticate)
.
Table 2
The stress of natural rubber - asphalt - aggregate blends of Cauchy’s deformation at 0.5 under the effects of
the speed of the compression (Speed) at 50, 150 and 250 mm/min, the amount of natural rubber (Rubber, R) 0, 5, 11
% wt, the molecular weight of natural rubber on the masticate (Masticate) 0 min (1,412,000 g/mol), 10 min (616,000
g/mol) and 30 min (418,000 g/mol), aggregate diameter of 4.75 - 9.50 mm (Small, S).
The speed of
the compression
(mm/min)
Stress (MPa) of Cauchy’s deformation at 0.5
Masticate: 0 min
(1,412,000 g/mol)
Masticate: 10 min
(616,000 g/mol)
Masticate: 30 min
(418,000 g/mol)
R: 0
%wt
R: 5
%wt
R: 11
%wt
R: 0
%wt
R: 5
%wt
R: 11
%wt
R: 0
%wt
R: 5
%wt
R: 11
%wt
50
0.665
0.238
0.155
0.665
0.318
0.312
0.665
0.182
0.145
150
1.010
0.468
0.269
1.010
0.560
0.389
1.010
0.369
0.251
250
1.618
0.697
0.473
1.618
0.784
0.561
1.618
0.647
0.441
Figures 7, 9 and 11 show the deformation behavior of polymer blends, it was found that the linear
viscoelastic behavior at the initiation of the compression due to the relaxation of polymer blends (Sombat, 2004). The
linear viscoelastic region describes the resistance of the polymer blends to loading and thus rutting and cracking due to
fatigue (Navarro
et al
., 2002). As the deformation increases, it was found that the non-linear viscoelastic behavior was
apparent due to the relaxation and creep of polymer blends and the movement of the aggregate (Sombat, 2009).
From Tables 2 the stress of Cauchy’s deformation at 0.5 (less time in the compression), it was found that
the stress increased when the speed of the compression increased. In addition, the relationship of compression
modulus - time, the compression modulus increased by the speed of compression. When the speed of the compression
increases, the chain of the natural rubber did not relaxed (Sombat, 2009). The chain of the asphalt and the aggregate
