增容剂对煤直接液化残渣改性沥青低温性能的影响

季节; 李辉; 王佳妮; 索智; 许鹰

增容剂对煤直接液化残渣改性沥青低温性能的影响

季节^{1, 2, ,},
李辉¹,
王佳妮^{1, 2},
索智^{1, 2},
许鹰^{1, 2}

1.
北京建筑大学土木与交通工程学院, 北京 100044
2.
北京未来城市设计高精尖创新中心, 北京 100044

基金项目:

国家自然科学基金 51778038

北京市自然基金委-北京市教委联合资助项目 KZ201910016017

长江学者和创新团队发展计划资助项目 IRT-17R06

市属高校基本科研业务费项目-ZC重大重点科研支撑专项-ZC05科研创新团队建设计划 X18259

详细信息

中图分类号: U414
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- 被引次数: 0
出版历程
- 收稿日期: 2019-04-08
- 修回日期: 2019-06-05
- 网络出版日期: 2021-01-23
- 刊出日期: 2019-08-10

Effect of compatibilizer on low-temperature performances of modified asphalts from direct coal liquefaction residue

JI Jie^{1, 2
, ,},
LI Hui¹,
WANG Jia-ni^{1, 2},
SUO Zhi^{1, 2},
XU Ying^{1, 2}

1.
School of Civil Engineering and Transportation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2.
Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China

Funds:

the National Natural Science Foundation of China 51778038

Beijing Natural Science Foundation Committee-Beijing Municipal Education Commission KZ201910016017

Yangtse Rive Scholar and Innovation Team Development Plan IRT-17R06

Fundamental Research Business Expenses of Municipal Universities-ZC Major Key Scientific Research Support Projects-ZC05 Scientific Research and Innovation Team Building Plan X18259

More Information

Corresponding author: JI Jie, E-mail: jijie@bucea.edu.cn

摘要

摘要: 为了评价不同增容剂对煤直接液化残渣改性沥青低温性能的影响，首先，通过正交实验确定出三种增容剂（硅烷偶联剂、苯甲醛、二甲苯）各自的最佳掺量及掺入方式；其次，采用双边缺口拉伸（DENT）试验评价加入三种增容剂后沥青的低温抗延性断裂性能；最后，结合SEM照片并利用Image Pro plus图像处理软件计算加入三种增容剂后沥青中煤直接液化残渣的分散面积比，以定量地表征三种增容剂对煤直接液化残渣改性沥青低温性能的改善效果。结果表明，加入适量增容剂在一定程度上有助于煤直接液化残渣在沥青中的分散，提高两者之间的相容性，保持煤直接液化残渣改性沥青体系的长期稳定状态，避免因煤直接液化残渣的沉淀聚集而在相界面产生应力集中，增强煤直接液化残渣改性沥青的低温抗延性断裂性能。三种增容剂对煤直接液化残渣改性沥青低温性能改善效果不同，硅烷偶联剂最优，次之为苯甲醛，最差为二甲苯。
- 增容剂 /
- 煤直接液化残渣改性沥青 /
- 双边缺口拉伸实验 /
- 低温性能 /
- 分散面积比
Abstract: In order to evaluate influence of different compatibilizers on low-temperature performances of direct coal liquefaction residue modified asphalts (DCLR modified asphalt), 3 compatibilizers including silane coupling agent, benzaldehyde and xylene were used. At first, the optimum dosage and mixing mode of the compatibilizers were determined by orthogonal test. Secondly, resistance to low-temperature cracking of the asphalt after adding compatibilizer was evaluated using the Double-Edge-Notched Tension (DENT) test. Finally, dispersion state of DCLR in asphalt were analyzed by scanning electron microscopy and software of Image Pro Plus diagram to quantitatively analyze low-temperature performances of the asphalts after adding compatibilizer. The test results show that addition of compatibilizer is helpful to improve dispersion of DCLR in asphalt and compatibility between them. Thus, the long-term stability of DCLR modified asphalt after adding compatibilizer can be maintained and its low-temperature performances are enhanced. Additionally, the 3 compatibilizers have different effects on low-temperature performances of the DCLR modified asphalt, silane coupling agent is the best, followed by benzaldehyde and xylene.
- compatibilizer /
- direct coal liquefaction residue modified asphalt /
- double edge notched tension test /
- low-temperature performance /
- dispersion area ratio

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图 1 DCLR改性沥青制备工艺

Figure 1 Preparation technology of DCLR modified asphalt

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图 2 三个指标随因素和水平的变化

Figure 2 Change of three indicators over factors and levels

(a): 10 ℃ ductility; (b): 25 ℃ penetration; (c): softenig point

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图 3 不同韧带宽度的荷载-位移图

Figure 3 Load-displacement diagrams under different ductility band widths

(a): benzaldehyde-direct coal liquefaction residue modified asphalt; (b): silane coupling agents-direct coal liquefaction residue modified asphalt; (c): xylene-direct coal liquefaction residue modified asphalt; (d): direct coal liquefaction residue modified asphalt

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图 4 达到最大屈服荷载时间

Figure 4 Time to reach the maximum yield load

note: direct coal liquefaction residue modified asphalt with different kinds of compatibilizers in the figure is expressed as "the name of compatibilizer-DCLR", the same below

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图 5 不同韧带宽度的最大屈服荷载

Figure 5 Maximum yield load under different ductility band widths

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图 6 最大屈服荷载下降为零的时间

Figure 6 Time to decrease the maximum yield load to zero

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图 7 不同DCLR改性沥青的CTOD值

Figure 7 CTOD value of different DCLR modified asphalts

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图 8 不同DCLR改性沥青扫描电镜照片

Figure 8 Scanning electron microscopy of different DCLR modified asphalts

(a): direct coal liquefaction residue modified asphalt; (b): benzaldehyde-direct coal liquefaction residue modified asphalt; (c): xylene-direct coal liquefaction residue modified asphalt; (d): silane coupling agents-direct coal liquefaction residue modified asphalt

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图 9 DCLR在不同沥青中的分散面积比

Figure 9 Dispersion area ratios for DCLR in different asphalts

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表 1 Shell-90及DCLR的基本性能

Table 1 Physical properties of Shell-90 and DCLR

Properties	Penetration at 25 ℃, 100 g, 5s (0.1mm)	Ductility, 10 ℃, 5 cm/min(cm)	Softening point t/℃	Four component w/%
Properties	Penetration at 25 ℃, 100 g, 5s (0.1mm)	Ductility, 10 ℃, 5 cm/min(cm)	Softening point t/℃	saturates	aromatics	asphaltenes	resins
Shell-90	81.4	45.1	82.5	10.2	48.1	10.2	31.5
DCLR	6	2.3	169	0.8	4.4	80.2	14.6

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表 2 增容剂的基本性质

Table 2 Physical properties of compatibilizers

Index	Benzaldehyde	Silane coupling agents	Xylene
Character	colorless liquid	colorless liquid	colorless liquid
Boiling point t/℃	179	190	144.4
Density ρ/(g·mL^-1)	1.042	0.950	0.860
Refractive index(n20/D)	1.5455	1.045	1.494

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表 3 正交实验设计表

Table 3 Orthogonal experimental design

Level/Factor	Types of compatibilizers /A	Dosage /B	Shearing time /C
1	silane coupling agents	0.5%	90 min
2	xylene	1.0%	45 min
3	benzaldehyde	1.5%	0 min
4	-	2.0%	-

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表 4 正交实验方案

Table 4 Orthogonal experiment scheme

Number	Types of compatibilizers/A	Dosage /B	Shearing time /C	Combination
1	silane coupling agents	0.5%	90 min	A₁B₁C₁
2	silane coupling agents	1.0%	45 min	A₁B₂C₂
3	silane coupling agents	1.5%	0 min	A₁B₃C₃
4	silane coupling agents	2.0%	90 min	A₁B₄C₁
5	xylene	0.5%	45 min	A₂B₁C₂
6	xylene	1.0%	90 min	A₂B₂C₁
7	xylene	1.5%	45 min	A₂B₃C₂
8	xylene	2.0%	0 min	A₂B₄C₃
9	benzaldehyde	0.5%	0 min	A₃B₁C₃
10	benzaldehyde	1.0%	0 min	A₃B₂C₃
11	benzaldehyde	1.5%	90 min	A₃B₃C₁
12	benzaldehyde	2.0%	45 min	A₃B₄C₂

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表 5 正交实验结果分析

Table 5 Orthogonal experiment results analysis

Properties		Types of compatibilizers/A	Dosage /B	Shearing time /C
Ductility, 10 ℃, 5 cm/min	K₁	12.00	8.10	9.35
	K₂	9.40	10.83	14.40
	K₃	12.20	12.03	9.85
	K₄	-	13.83	-
	range R	2.80	5.73	5.05
	correction R′	2.91	4.47	5.25
	best combination		A₃B₄C₂
Penetration at 25 ℃, 100 g, 5 s	K₁	60.43	54.40	53.53
	K₂	67.05	57.60	73.63
	K₃	57.40	63.57	57.73
	K₄	-	70.93	-
	range R	9.65	16.53	20.10
	correction R′	10.04	12.88	20.90
	best combination		A₂B₄C₂
Softenig point	K₁	48.90	51.14	50.10
	K₂	48.45	48.88	47.16
	K₃	49.22	48.30	49.31
	K₄	-	47.10	-
	range R	3.500	4.667	2.633
	correction R′	0.80	3.15	3.06
	best combination	A₃B₃C₂

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