Semi Dense Bituminous Concrete:
Semi Dense Bituminous Concrete (SDBC) is similar to BC, but with a higher void content (5-10 per cent, as against 3-5 per cent in the case of BC). The thickness of the layer is 20-25 mm. The binder percentage is 4.5-6.0. The mixing and rolling operations are similar to BC. The mix design is done by the Marshall test, and a stability value of 3.4 kN (340 Kg) is aimed at.