blown asphalt is a kind of asphalt that is treated by blowing air through it at elevated temperature to give it characteristics desired for certain it uses such as roofing, pipe coating, undersealing portland cement concrete pavements, membrane envelopes and hydraulic applications. Oxidized asphalts are used in roofing operations, pipe coating, undersealing for Portland cement concrete pavements, hydraulic applications, membrane envelopes, some paving-grade mixes and the manufacture of paints