Good Morning All
Our Department of Transport in the Northern Territory, Australia has recently
implemented the use of a waterproof membrane (usually a 10mm PMB seal) under all
asphalt wearing surfaces used on our road network as there is a perceived
problem of water penetrating the wearing course. Obviously this has increased
our costs by 40-50% on new roads. Does anyone have any research they have
carried out on the permeability of asphalt. I can understand the reason to use
this under an open graded asphalt but it seems an ineffiecient and costly
exercise under a dense graded mix.
Regards
Paul Bicknell
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|