The Effect of Aging on the Cracking Resistance of Recycled Asphalt

Table 4

BBR test results.

Aging	Binder	Rejuvenator	Temp. (°C)	Creep stiffness (MPa)	m-value	Stiffness; critical temp. (°C)	m-value; critical temp. (°C)	High temp. true grade (°C)
Standard aging; RTFO + 20 hours PAV	Binder 1	Original	−12	190	0.309	−25.4	−22.7	87.7
			−18	430	0.228
		HPE	−12	72.8	0.353	−31.5	−25.9	83.4
			−18	178	0.27
		CWE	−12	81.1	0.346	−31.4	−26.8	81.9
			−18	187	0.288
	Binder 2	Original	−12	159	0.313	−27.5	−24.2	91.4
			−18	319	0.277
		HPE	−12	62.3	0.342	−30.9	−24.2	88.2
			−18	180	0.229
		CWE	−12	80.3	0.332	−33.5	−27.8	86.7
			−18	160	0.299
Extended aging; 60 hours PAV	Binder 1	Original	−6	143	0.299	−23.3	−15.8	96.6
			−12	263	0.258
			−18	475	0.202
		HPE	−6	46.1	0.319	−33.5	−19.9	93.4
			−12	89.8	0.29
			−18	169	0.258
		CWE	−6	55.3	0.311	−31.3	−19.0	93.0
			−12	112	0.289
			−18	212	0.241
	Binder 2	Original	−6	105	0.31	−26.0	−17.9	101.4
			−12	191	0.279
			−18	374	0.223
		HPE	−6	36.5	0.372	−29.4	−22.6	94.6
			−12	79.8	0.309
			−18	233	0.205
		CWE	−6	58.4	0.309	−32.4	−18.0	96.3
			−12	112	0.282
			−18	198	0.265