温拌再生沥青胶结料二次老化性能

李强; 陆杨; 王家庆; 孙光旭; 赵曜

doi:10.19818/j.cnki.1671-1637.2022.04.007

温拌再生沥青胶结料二次老化性能

doi: 10.19818/j.cnki.1671-1637.2022.04.007

李强^1,,
陆杨¹,
王家庆^1, ,,
孙光旭²,
赵曜¹

1.
南京林业大学土木工程学院，江苏南京 210037
2.
华设设计集团股份有限公司，江苏南京 210005

基金项目:

国家自然科学基金项目 52108408

江苏省科技项目 BK20181404

江苏省科技项目 BK20210617

江苏省产学研合作项目 BY2021313

详细信息

作者简介:
李强(1982-)，男，江苏新沂人，南京林业大学教授，工学博士，从事路面结构与材料研究

通讯作者:
王家庆(1994-)，男，安徽六安人，南京林业大学副教授，哲学博士(美国)

中图分类号: U113
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出版历程
- 收稿日期: 2022-03-09
- 刊出日期: 2022-08-25

Secondary aging performance of warm-mix recycled asphalt binder

1.
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
2.
China Design Group Co., Ltd., Nanjing 210005, Jiangsu, China

Funds:

National Natural Science Foundation of China 52108408

Science and Technology Foundation of Jiangsu Province BK20181404

Science and Technology Foundation of Jiangsu Province BK20210617

Industry-University-Research Cooperation Project BY2021313

More Information

Author Bio:
LI Qiang(1982-), male, professor, PhD, liqiang2526@njfu.edu.cn

WANG Jia-qing(1994-), male, associate professor, PhD, jiaqingw@njfu.edu.cn

Article Text (Baidu Translation)

摘要

摘要: 为研究温拌再生沥青胶结料的二次老化性能，以2种常用温拌剂为基础，考虑再生剂与不同改性剂复杂耦合作用，提出3种不同的再生方案；基于动态剪切流变试验，分析3种不同温拌再生方案下的沥青胶结料在二次老化前后、不同二次老化程度下的黏弹性能、抗车辙性能及抗疲劳性能的变化规律，通过傅里叶红外光谱试验和环境扫描电镜试验分析了不同温拌再生方案下沥青胶结料表面化学官能团及其微观结构的变化规律。研究结果表明：Sasobit温拌剂较大程度提高了再生沥青胶结料在二次老化后的弹性特征及抗车辙性能，但其疲劳寿命在5%应变水平及二次老化作用下小于10 000次；Evotherm 3G与SBR胶乳及胶粉的结合在一定程度提升了再生沥青胶结料在二次老化后的高温性能，且保留了原有的低温性能，其与SBR胶乳的结合呈现出最佳的黏弹性能，而其与胶粉的结合呈现的不可恢复蠕变柔量在二次老化后仍小于0.05，展现出极佳的抗车辙性能；微观化学物理特性分析结果揭示了不同再生方案下的二次老化机理，其化学官能团及微观结构表征的变化规律与动态流变剪切特性的变化规律呈现出较好的相关性。
- 路面工程 /
- 温拌再生沥青 /
- 动态剪切流变 /
- 二次老化 /
- 胶粉 /
- 微观结构
Abstract: In order to investigate the secondary aging performance of warm-mix recycled asphalt binder, three different recycling schemes were proposed on the basis of two commonly used warm agents and considering the complex coupling effects of regenerants and different modifiers. By the dynamic shear rheological test, the change laws of viscoelasticity performance, rutting resistance performance, and fatigue resistance performance of asphalt binder were analyzed by using the three different warm-mix recycling schemes before and after secondary aging and under different secondary aging degrees. The change laws of surface chemical functional groups and microstructures of asphalt binder under different warm-mix recycling schemes were analyzed by the Fourier transform Infrared and environmental scanning electron microscopy (ESEM) test. Analysis results indicate that the elastic characteristics and rutting resistance performance of recycled asphalt binder after secondary aging are greatly improved by the warm agent Sasobit, but its fatigue life is less than 10 000 under the strain level of 5% and secondary aging. With the combination of Evotherm 3G with SBR latex and rubber powder, the high-temperature performance of recycled asphalt binder after secondary aging is promoted to some extent, and the original low-temperature performance is maintained. Under the combination of Evotherm 3G with SBR latex, the optimal viscoelastic performance is presented, while under the combination of Evotherm 3G with rubber powder, the irrecoverable creep compliance is still less than 0.05 after secondary aging, and excellent rutting resistance performance is shown. The secondary aging mechanisms under different recycling schemes are revealed by the analysis results of microchemical and microphysical properties, and the change laws of chemical functional groups and microstructure characteristics are well correlated with the change laws of dynamic shear rheological properties.
- pavement engineering /
- warm-mixed recycled asphalt /
- dynamic shear rheology /
- secondary aging /
- rubber powder /
- microstructure

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图 1 老化模拟方法流程

Figure 1. Flow of aging-simulation method

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图 2 动态剪切流变仪

Figure 2. Dynamic shear rheometer

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图 3 再生方案A二次老化后复数剪切模量主曲线

Figure 3. Principal curves of complex shear modulus after secondary aging of recycling plan A

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图 4 再生方案B二次老化后复数剪切模量主曲线

Figure 4. Principal curves of complex shear modulus after secondary aging of recycling plan B

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图 5 再生方案C二次老化后复数剪切模量主曲线

Figure 5. Principal curves of complex shear modulus after secondary aging of recycling plan C

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图 6 温拌再生沥青二次老化后J_{nr, τ}

Figure 6. J_{nr, τ} after secondary aging of warm-mixed recycled asphalt

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图 7 温拌再生沥青二次老化后R_τ

Figure 7. R_τ after secondary aging of warm-mixed recycled asphalt

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图 8 温拌再生沥青二次老化后J_nr-diff

Figure 8. J_nr-diff after secondary aging of warm-mixed recycled asphalt

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图 9 再生方案A二次老化后损伤特征曲线

Figure 9. Damage characteristic curves of recycling plan A after secondary aging

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图 10 再生方案B二次老化后损伤特征曲线

Figure 10. Damage characteristic curves of recycling

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图 11 再生方案C二次老化后损伤特征曲线

Figure 11. Damage characteristic curves of recycling plan C after secondary aging

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图 12 2.5%、5.0%应变水平下温拌再生沥青二次老化后的疲劳寿命

Figure 12. Fatigue lifes after secondary aging of warm-mixed recycled asphalt with a strain level of 2.5% and 5.0%

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图 13 温拌再生沥青二次老化前后红外光谱

Figure 13. Infrared spectra of warm-mixed recycled asphalt before and after secondary aging

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图 14 A类再生沥青扫描结果

Figure 14. Scanning results of class A recycled asphalt

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图 15 B类再生沥青及二次老化后扫描结果

Figure 15. Scanning results of class B recycled asphalt and after secondary aging

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图 16 C类再生沥青及二次老化后扫描结果

Figure 16. Scanning results of class C recycled asphalt and after secondary aging

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表 1 不同阶段SBS改性沥青技术指标

Table 1. Technical indexes of SBS modified asphalt at different stages

技术指标	原样SBS	初次老化	二次老化
针入度(25 ℃，5 s，100 g)/0.1 mm	50.0	37.2	29.3
针入度指数	0.01
延度(10 ℃，5 cm·min^-1)/cm	41.8	25.5	6.45
软化点(环球法)/℃	79.0	86.4	84.5
布氏黏度(135 ℃)/(Pa·s)	2.1
闪点(克利夫兰开口杯法)/℃	320
溶解度(三氯乙烯)/%	99.82
离析、软化点差/℃	1
弹性恢复/%	92
动力黏度(60 ℃、真空减压毛细管法)/(Pa·s)	2 025	7 635	5 219
密度(15 ℃)/(g·cm^-3)	1.030

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表 2 再生方案

Table 2. Recycling schemes

方案	再生沥青胶结料组成	添加剂(按添加顺序排列)
A	老化沥青+再生剂+Sasobit温拌剂	Sasobit再生剂
B	老化沥青+再生剂+Evotherm 3G温拌剂+SBR胶乳	Evotherm再生剂、SBR胶乳
C	老化沥青+再生剂+Evotherm 3G温拌剂+胶粉	Evotherm再生剂、胶粉

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表 3 温拌再生沥青胶结料二次老化后CA模型参数

Table 3. CA model parameters of warm-mixed recycled asphalt binder after secondary aging

再生方案	老化时间	T_g/℃	ω_c/Hz	R_I
A	二次老化前	-1.263	0.222	3.253
	PAV老化0 h	-0.460	0.342	3.075
	PAV老化6 h	-0.313	0.746	2.921
	PAV老化16 h	0.204	0.673	2.856
	PAV老化28 h	1.455	0.418	2.838
B	二次老化前	-11.176	30.609	2.707
	PAV老化0 h	-15.430	49.714	2.607
	PAV老化6 h	-10.396	21.497	2.620
	PAV老化16 h	-8.354	13.533	2.635
	PAV老化28 h	-6.314	5.569	2.748
C	二次老化前	-8.626	0.588	3.378
	PAV老化0 h	-8.011	0.080	3.665
	PAV老化6 h	-7.462	0.062	3.737
	PAV老化16 h	-7.155	0.043	3.807
	PAV老化28 h	-5.955	0.032	3.883

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表 4 温拌再生沥青二次老化后VECD相关参数

Table 4. VECD related parameters after secondary aging of warm-mixed recycled asphalt

再生方案	老化时间	α	β₁	β₂	P_0.1	Q₁	Q₂
A	二次老化前	1.788	5.297×10⁶	-3.576	1.000	0.139	0.346
	PAV老化0 h	1.844	2.624×10⁶	-3.688	1.000	0.149	0.337
	PAV老化6 h	1.846	1.674×10⁶	-3.692	1.000	0.155	0.332
	PAV老化16 h	1.916	1.925×10⁶	-3.832	1.000	0.168	0.320
	PAV老化28 h	2.012	1.663×10⁶	-4.025	1.000	0.188	0.306
B	二次老化前	1.479	6.314×10⁵	-2.957	1.000	0.041	0.543
	PAV老化0 h	1.513	6.924×10⁵	-3.025	1.000	0.053	0.502
	PAV老化6 h	1.651	7.560×10⁵	-3.303	1.000	0.075	0.450
	PAV老化16 h	1.580	7.509×10⁵	-3.360	1.000	0.068	0.460
	PAV老化28 h	1.637	7.213×10⁵	-3.505	1.000	0.079	0.433
C	二次老化前	1.795	1.244×10⁷	-3.591	1.000	0.084	0.399
	PAV老化0 h	1.860	1.189×10⁷	-3.720	1.000	0.102	0.371
	PAV老化6 h	1.881	1.187×10⁷	-3.763	1.000	0.101	0.373
	PAV老化16 h	2.002	1.099×10⁷	-3.708	1.000	0.128	0.337
	PAV老化28 h	2.122	1.095×10⁷	-3.712	1.000	0.108	0.357

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表 5 温拌再生沥青老化前后官能团指数

Table 5. Functional group indexes before and after aging of warm-mixed recycled asphalts

沥青种类	I_B	I_Ar	I_C=O	I_S=O
A	0.198	0.113	0.010	0.016
A-PAV老化28 h	0.190	0.111	0.025	0.083
B	0.185	0.082	0.037	0.023
B-PAV老化28 h	0.199	0.050	0.091	0.059
C	0.192	0.065	0.011	0.005
C-PAV老化0 h	0.193	0.088	0.030	0.024
C-PAV老化6 h	0.194	0.073	0.052	0.048
C-PAV老化16 h	0.198	0.068	0.053	0.050
C-PAV老化28 h	0.203	0.053	0.055	0.053

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