How much asphalt should be placed over a cemented stabilised layer?
In local roads as little as 25 mm of asphalt has successful worked on cemented materials. In heavy trafficked roads, 50 to 100 mm of asphalt is used provided crack sealing is carried out when they reflect to the surface to prevent water ingress below the pavement. To minimise reflective cracking for heavy duty pavements and take advantage of the second stage or cracked phase of life, Austroads recommends 175 mm of asphalt over a cemented material. Before placing the asphalt layer, AustStab recommends for local roads a Sami seal be placed over the cement stabilised layer to minimise the probability of reflective cracking appearing in the surface.
