It provides the pavement with added stiffness and resistance to fatigue for

It provides the pavement with added stiffness and

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It provides the pavement with added stiffness and resistance to fatigue, for which reason the material used in a roadbase must always be of reasonably high quality. Roadbase materials range from crush rock and/or unbound soils to chemically stabilised soils. 20
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Lecture 7 13/04/14 PAVEMENT DESIGN SURFACE COURSE (SURFACING) This is the uppermost layer of the flexible pavement. The materials used may range from loose mixtures of soil and gravel to the very highest quality bituminous mixtures. The surface course, when composed of bituminous materials may consist of one homogenous layer or, in high-quality pavements, of two distinct sub-layers known as the wearing course and a basecourse respectively. The wearing course provides the actual surfacing on which vehicles run, whilst the basecourse acts as a regulating layer to provide the wearing course with a better riding quality. The basecourse is normally composed of a more pervious material than the wearing course . 21
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Lecture 7 13/04/14 PAVEMENT DESIGN Bituminous surfacings are generally expected to: Contribute to the structural strength of the pavement, Provide a high resistance to plastic deformation and resistance to cracking under traffic, Provide good skid-resistant driving surface and low tyre noise, and Good drainage, including prevention of the penetration of surface water into underlying layers. 22
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  • Summer '14
  • Freeway, Motorway, roundabout, Grade separation, At-grade intersection, Turbo Roundabouts

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