The Properties And Performance Of Polymer
Fibre Reinforced Bituminous Mixtures
Author(s)
I. Kamaruddin & M. Napiah
Abstract
The low tensile strength of bituminous mixtures has been recognized as a source
of its poor performance, particularly that which relates to cracking. Laboratory
investigations into improving their tensile properties have been performed
utilizing polypropylene and polyester fibres which were added to Hot Rolled
Asphalt (HRA) bituminous mixtures as partial replacement of Ordinary Portland
Cement (OPC) used as the filler material.
The incorporation of the polymer fibres into the bituminous mixtures altered
the rheological properties and behaviour of the resulting binder whilst resulting
in a higher optimum bitumen content for the mixture. Laboratory tests showed
that the fibres reduced the density, stability and stiffness of the resulting mixture
while increasing its porosity and permeability.
Bituminous mixtures containing the fibres displayed lower susceptibility to
moisture induced damage. Even though these mixtures have a higher void
content than the base mixture, the additional bitumen in the fibre mixtures
increased the film thickness on the aggregate particles thus affording greater
protection from moisture. The addition of the fibres into the bituminous mixtures
caused a slight decrease in the tensile strength and a slight increase in the tensile
strain (elongation) at failure, indicating that the additional bitumen added
flexibility or extensibility to the mixtures. This was manifested in the higher
toughness and energy that was obtained in the mixtures, thus improving its
resistance to cracking. This was supported by the fatigue tests which showed
improved fatigue performance of the mixtures. The fatigue properties of the fibre
mixtures were not enhanced at low strain levels; but at high strain levels, the
fibre mixtures provided a far superior performance than the base mixture,
making it appealing for use as a base-course in highway construction.
Keywords
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