Some textile products such as non-woven geotextiles are convenient for increasing the life-time and operation of asphalt and its coating, The Geotextile is able to damp received pressures of previous coating through tensile resistance. Geotextile as mediated layer would damp the pressures which are caused by horizontal or vertical cracks. Blending of nonwoven geotextiles with bitumen and asphalt creates an impermeable layer to surface water streams. Due to the proximity of polymer fibers properties to petroleum materials, the adsorption of bitumen and bonding materials to geotextile fabric is would be done well. This will save budget, reduce costs and increase the life time of asphalt.
TWO IMPORTANT MECHANISMS OF NONWOVEN GEOTEXTILES
First, as an intermediate layer which is mixed with bitumen, it absorbs stress and pressure, which is caused preventing the wide-spreading of cracks reflected from the previous coating to the new coating layer. Second, as a moisture insulation layer, it prevents snow, rain and other liquids to penetrate to the substrate through surface cracks in the asphalt and moistening the substrate and subsequently causing rupture and weakness in the asphalt substrate. With these two general mechanisms, it causes a significant increase of one hundred percent to one hundred and fifty percent of the asphalt life-time.
AC COATING
This coating is a common procedure for fixing the cracked roads , this method would cover roads cracks temporarily , And after the cover is replaced, it prevents any lateral or longitudinal movement of the road that causes the cracks of the previous cover to spread to the new cover.