<P>The initial mix-design developed was improved during the project and evolved through the selection of constituents, mix-design and laboratory application processes and assessment of behaviour. This was assessed for critical properties such as: skid resistance; binder function; protection of lower pavement layers; cracking behaviour; and bond between the cementitious and the bituminous substrate. The results showed that the thickness of the fibre-reinforced mortar layer needed to be minimised to control costs. At the same time, it needed to be thick enough to allow for good penetration of the chippings in the fresh mortar.</P>
<P>Testing showed that HPCM has great strength and integrity and there is a high probability that wearing courses of the material will be practically maintenance-free during a likely service life of 30 years, even on roads with heavy traffic volumes.Production of HPCM uses existing know-how and equipment although laying the material and inserting the chippings will require some modification to existing machines. Further testing in the field is also needed to achieve the best balance between mixing/handling/placing and the performance of the hardened material. However HPCM has the potential to offer high skid resistance, comfort, durability and moderate noise emissions.</P>Statistics: Posted by qizhenapp — Tue Jun 06, 2017 12:27 pm
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