Production of normal bitumen and modified bitumen based on used elastomers

Normal bitumen and modified bitumen based on used elastomers is produced by blowing an intermediate product from secondary crude oil recovery into a bitumen product having specified penetration range. Production of normal bitumen and modified bitumen based on used elastomers comprises blowing an intermediate product (A) from secondary oil recovery via a two-stage oxidation at 240-280 deg C at 1-3 bar into a bitumen base product (B) having a penetration of 20-30 x 10-1 mm at 25o C, obtaining the products (C) to (F) (C = 35-50 x 10-1 mm, D = 50-70 x 10-1 mm, E = 70-100 x 10-1, F = 160-210 x 10-1, all at 25o C), adding up to 5 wt.% used elastomers (G) in portions to product (F) and homogenizing to form a polymer-modified bitumen base product (H) having a penetration of at least 20 x 10-1 mm at 25 deg C and a softening point of 55-63 deg C, and adding product (F) to product (H) until the polymer-modified bitumen (I) and (J) are obtained (I = penetration of at least 50 x 10-1 and softening point of 48-55 deg C, (J) = penetration of at least of at least 120 x 10-1 and softening point of 40-48 deg C).