9
had no time to relax and to move (Sombat, 2009). The residual stress was within the polymer blends (Sombat, 2009).
As a result, the stress increased.
Conclusions
The effects of aggregate size were found to cause the increase of the stress as the aggregate size became
smaller. The compression modulus also increased when the aggregate size increased. The effects of the speed of the
compression made the stress increased as it was increased. It was also found that the compression modulus increased
as the speed of compression increased.
Acknowledgements
The authors wish to express gratitude to Division of Physics, Faculty of Science and Technology, Prince of
Songkla University (Pattani) for allowing to carry out the laboratory experiments and Pattani Highway District for
providing materials.
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