用于高模量沥青砼的复合改性硬质沥青低温性能

doi:10.13229/j.cnki.jdxbgxb20200846

Abstract

Abstract:

To find hard asphalts with perfect high temperature stability and low temperature crack resistance as the cementation material of high-modulus asphalt concrete， SBS modified asphalt was used to modify six kinds of natural hard asphalt. The relationship between the dosage of SBS and the dynamic modulus of the mixture was explored. The low-temperature performance of this hard asphalt before and after the modification was investigated from the three levels including asphalt， asphalt mortar and asphalt mixture. The results show that the low temperature performances of the modified asphalt， asphalt mortar， and mixture also have different degrees improvements. It is a good choice for producing high-modulus asphalt concrete. The study also found that among the many low-temperature performance evaluation indicators， low-temperature critical cracking temperature （T_CR） of asphalt mortar is the most relevant to the test results of low-temperature bending of the mixture. When selecting asphalt binder for high-modulus asphalt concrete， special attention should be paid to this indicator.

Key words: road engineering, high modulus asphalt concrete, hard asphalt, low temperature crack resistance performance, rutting resistance, interfacial adhesion coefficient

CLC Number:

U414

Quan-ping XIA,Jiang-ping GAO,Hao-yuan LUO,Qi-gong ZHANG,Zhi-jie LI,Fei YANG. Low⁃temperature performance of composite modified hard asphalt used in high modulus asphalt concrete[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(3): 541-549.

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指标	沥青型号							测试方法
指标	AL-50#	IT-50#	SP-50#	SC-50#	XJ-50#	TZ-50#	SBS-I	测试方法
25 ℃针入度/（0.1 mm）	49.2	47.0	61.6	56.2	54.1	42.7	40.3	T0604
针入度指数PI	0.8	-1.0	0.1	-1.8	-0.17	0.55	0.31	T0604
软化点/℃	48.5	50.6	47.9	48.3	53	62.5	87.5	T0606
5 ℃延度/cm（SBS）	-	-	-	-	-	-	35	T0605
10 ℃延度/cm	7.2	10.2	8.0	17	15	9	-	T0605
15 ℃延度/cm	13.0	57.0	13.7	＞100	89	81	-	T0604
RTFOT质量变化	-0.2	-0.1	-0.1	-0.1	-0.1	0.0	-0.045	T0610
残留针入度	59.6	72.7	62.5	62	63	75.6	77.2	T0604
10 ℃残留延度/cm	4.1	4.8	4.8	3	脆断	脆断	-	T0605
5 ℃残留延度/cm（SBS）	-	-	-	-	-	-	20	T0605
PG分级	64-16	70-16	64-16	64-22	76-16	82-16	70-22	AASHTO M320
英标针入度分级	50/70	40/60	50/70	50/70	35/50	30/45	40/60	EN 12591

指标	沥青型号						测试方法
指标	AL-SBS	IT-SBS	SP-SBS	SC-SBS	XJ-SBS	TZ-SBS	测试方法
25 ℃针入度/（0.1 mm）	34	30	32	41	28	19	T0604
针入度指数PI	1.56	0.91	0.49	1.1	1.21	0.65	T0604
软化点/℃	81.1	85.6	81.3	79.6	91	93.6	T0606
英标针入度分级	30/45	30/45	30/45	30/45	20/30	10/20	EN 12591

沥青样品	车辙深度/mm	抗车辙性能排名	技术要求
AL-50#	6.2	10	≤20
IT-50#	19 000次后失效	12
SP-50#	5.3	7
SC-50#	6.2	9
XJ-50#	5.7	8
TZ-50#	4.0	3
AL-SBS	3.7	2
IT-SBS	7.8	11
SP-SBS	4.4	5
SC-SBS	5.1	6
XJ-SBS	4.2	4
TZ-SBS	2.1	1

沥青样品	空隙率/%	弯曲模量/MPa	弯曲破坏应变ε_B/με	低温弯曲性能排名
AL-50#	2.8	2469	2560	7
IT-50#	2.6	3061	1694	11
SP-50#	2.5	3863	1716	10
SC-50#	1.8	3179	3125	5
XJ-50#	2.0	3186	1989	9
TZ-50#	2.4	3059	1457	12
AL-SBS	3.7	2759	3998	2
IT-SBS	2.9	3703	2835	6
SP-SBS	2.8	3570	3384	4
SC-SBS	2.5	3241	4201	1
XJ-SBS	2.4	3011	3853	3
TZ-SBS	2.8	4167	2421	8

Low⁃temperature performance of composite modified hard asphalt used in high modulus asphalt concrete

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