compacted by a steam roller renders even clay as a solid material. Think of the density of clay soil, compacted even further. Clay bricks, clay pipe, etc.
Full of heavy metals , if as you say, but under the surface of the road, meaning what? Define how these heavy metals would have an effect in real life scenario, under these circumstances. I know, the rain would cause it to leach and get into the adjacent soil. BUT WAIT, the ashphaly is a bonding agent, a water resistant bonding agent.
News 
Market Data 
Discover 
