- Ground floor 2 tight layer of asphalt concrete type I, the total minimum thickness of this surface layer must comply with in section 2.2.9: If the total number of standard axles accumulated in 15 years on 1 lane Ne = 2,16.106 the total thickness of at least 2 layers of asphalt concrete is 10 cm (Table 2.2, section 2.2.9) and because they were placed on semi-hard foundation layer should be 12-18 cm minimum but not less more than half the thickness of the hard layer of the nail;
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