Effect of Recycled Rubber on the Properties of Road Bitumen

Table 2

Bitumen modification at 220°C.

Sample no.	Modifiers (%)				Modification time (h)	Residue after devulcanization (%)
	Rubber 0.4	Rubber 0.8	PB solution	Sulfur donor
7	15	—	3	0.07	2	5.3
8	15	—	3	0.07	4	4.0
9	—	15	3	0.07	4	5.3
10	15	—	3	0.07	8	3.4
11	—	15	3	0.07	8	3.8
12	15	—	3	0.07	16	2.8
13	—	15	3	0.07	16	3.7