RET/胶粉复合改性沥青制备及其混合料性能评价

doi:10.13229/j.cnki.jdxbgxb.20210850

摘要/Abstract

摘要：

为确定反应性弹性体三元共聚物（RET）/胶粉复合改性沥青最佳组成配比，借助Design-Expert分析了RET、胶粉和油分掺量与沥青性能之间的定量关系，采用动态剪切流变仪、红外光谱仪和荧光显微镜探究了复合改性机理，并对复合改性沥青路用性能和疲劳性能进行了验证评价。结果表明：RET和胶粉掺量与改性沥青性能存在非线性函数关系，RET、胶粉和油分最佳掺量分别为沥青质量的1.69%、16.52%和1.83%；RET/胶粉复合体系可与沥青发生化学反应生成新的吸收峰，使改性剂与沥青之间的边界减弱，改善胶粉与沥青的相容性，提升RET沥青的低温性能，从而提高沥青混合料的路用性能。

关键词: 道路工程, 改性沥青, 反应性弹性体三元共聚物, 胶粉, 组分优化, 改性机理

Abstract:

To determine the optimal ratio of reactive elastomer terpolymer（RET） and rubber modified asphalt， the quantitative relationship between asphalt performance and the content of RET， rubber and oil was comprehensively investigated based on Design-Expert. The modification mechanism of composite modified asphalt was investigated by Dynamic Shear Rheometer， Infrared Spectrometer and fluorescence microscope and the road performance and fatigue performance of composite modified asphalt were verified and evaluated. The results show that the relationship between asphalt performance and the content of RET and rubber is not linearly， the optimum content of RET， rubber powder and oil is respectively 1.69%， 16.52% and 1.83% of the asphalt. The RET/rubber powder composite system can react with asphalt to generate new absorption peaks， which weakens the boundary between the modifier and asphalt. Thus， the compatibility of rubber powder and asphalt and the low temperature performance of RET modified asphalt were improved， which can significantly improve the road performance of asphalt mixture.

Key words: road engineering, modified asphalt, reactive elastomeric terpolymer, rubber powder, component optimization, modified mechanism

中图分类号:

U414

郑睢宁,何锐,路天宇,徐紫祎,陈华鑫. RET/胶粉复合改性沥青制备及其混合料性能评价[J]. 吉林大学学报(工学版), 2023, 53(5): 1381-1389.

Sui-ning ZHENG,Rui HE,Tian-yu LU,Zi-yi XU,Hua-xin CHEN. Preparation and evaluation of RET/rubber composite modified asphalt and asphalt mixture[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(5): 1381-1389.

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试验项目	试验结果	规定值
针入度/（25 ℃，0.1 mm）	66	60~80
软化点/℃	50	≥46
延度/（15 ℃，cm）	>100	≥100

序号	沥青/%	RET/%	胶粉/%	油分/%
F1	100	1.0	10	1.5
F2	100	1.0	15	2.5
F3	100	1.0	20	3.5
F4	100	1.5	10	3.5
F5	100	1.5	15	1.5
F6	100	1.5	20	2.5
F7	100	2.0	10	2.5
F8	100	2.0	15	3.5
F9	100	2.0	20	1.5
JZ	100	-	-	-
JF	100	-	20	3.5
RE	100	2	-	-

序号	针入度/（25 ℃，0.1 mm）	软化点/℃	延度/（5 ℃，cm）	135 ℃粘度/（Pa·s）	存储稳定性/℃
F1	57	64.5	12.3	2.351	1.7
F2	51	66.0	15.4	2.774	1.9
F3	47	69.5	16.2	2.927	2.2
F4	55	73.0	11.2	2.470	1.0
F5	50	75.5	15.4	2.607	1.9
F6	47	74.5	17.6	3.015	2.3
F7	52	76.5	10.6	2.672	0.8
F8	47	78.0	15.7	2.794	1.3
F9	43	81.5	16.0	3.154	2.4
JZ	66	50.0	8.3	0.528	-
JF	45	58.5	17.7	2.847	7.3
RE	61	65.0	7.8	2.187	0.5

试验	沥青/%	RET/%	胶粉/%	油分/%	针入度/（25 ℃，0.1 mm）	软化点/℃	延度/（5 ℃，cm）	135 ℃粘度/（Pa·s）	存储稳定性/℃
预测值	100	1.69	16.52	1.83	48	75.0	17.3	2.809	1.78
试验值	100	1.69	16.52	1.83	49	75.5	17.2	2.782	1.6

级配组成	通过率/%
级配组成	16 mm	13.2 mm	9.5 mm	4.75 mm	2.36 mm	1.18 mm	0.6 mm	0.3 mm	0.15 mm	0.075 mm
级配上限	100	100	85	69	50	39	28	20	16	8
级配下限	100	90	69	39	24	13	10	8	4	4
级配中值	100	95.2	78.4	54.6	38.8	27.2	19.6	14.4	10.0	6.5