Effect of Gamma-Irradiated Recycled Low-Density Polyethylene on the High- and Low-Temperature Properties of Bitumen

Table 4

DSR test results of the original and aged of base and γ-LDPE_R modified bitumens.

Binders		Temperature (°C)	G* (KPa)	δ (°)	G*/sin δ (KPa)	Specification limits (Pa)	Performance grading
B	Original	52	4.64	86.6	4.65	≥1000	PG 52-Y
		58	1.85	87.4	1.85
		64	0.766	88.2	0.767
	Aged	52	3.06	87.1	3.07	≥2200
		58	1.39	87.2	1.39
B-1-γ-LDPER	Original	52	2.75	80.7	2.78	≥1000	PG 58-Y
		58	1.31	77.3	1.35
		64	0.702	72.7	0.735
	Aged	52	9.47	82.3	9.56	≥2200
		58	4.07	84	4.10
		64	1.88	84.9	1.89
B-3-γ-LDPER	Original	52	3.60	85.8	3.61	≥1000	PG 58-Y
		58	1.66	85.5	1.66
		64	0.843	84.3	0.84
	Aged	52	10.6	78.7	10.6	≥2200
		58	4.66	77.9	4.76
		64	2.42	74.7	2.42
		70	1.25	71.2	1.32
B-5-γ-LDPER	Original	52	5.36	81.6	5.42	≥1000	PG 64-Y
		58	2.47	79.9	2.51
		64	1.27	77.1	1.30
		70	0.72	73.4	0.75
	Aged	52	16.8	80	17.1	≥2200
		58	7.07	82.4	7.13
		64	3.14	83.7	3.16
		70	1.52	84.3	1.53
B-7-γ-LDPER	Original	52	7.69	84.5	7.72	≥1000	PG 64-Y
		58	3.34	85.4	3.35
		64	1.62	85.4	1.63
		70	0.863	84.1	0.868
	Aged	52	20.7	77.7	21.2	≥2200
		58	9.04	80.2	9.18
		64	4.26	81.7	4.30
		70	2.13	82.3	2.15
B-9-γ-LDPER	Original	52	10.3	71.9	10.8	≥1000	PG 76-Y
		58	5.37	68.4	5.78
		64	3.13	64.6	3.47
		70	1.99	60.7	2.28
		76	1.33	57	1.59
		82	0.881	53.4	1.10
	Aged	52	51.4	69.1	55	≥2200
		58	25	70.9	26.4
		64	13	71.7	13.7
		70	5	70.3	5.31
		76	2.89	68.2	3.11
		82	1.78	65.2	1.96