Preparation of waste oil/resin/dioctyl adipate composite regenerant and evaluation of protective effect of warm mixing agent on asphalt mixing aging

doi:10.19491/j.issn.1001-9278.2024.05.018

Abstract

Abstract:

To verify the applicability of waste oil for the recovery of asphalt aging performance， a composite waste oil regeneration agent was prepared by means of a response surface method using waste oil， C₉ petroleum resin， and dioctyl adipate as raw materials. To avoid the volatilization and aging of lightweight components during the mixing process of recycled asphalt， a warm mixing agent was introduced to reduce the mixing temperature and obtain performance protection of recycled asphalt. At the same time， the regeneration effect of the recycled agent on the aged asphalt and the protective effectiveness of the warm mixed agent were investigated. The results indicated that the defects of poor low⁃temperature ductility of aged asphalt were recovered. The recycled asphalt exhibited a better resistance to high⁃temperature deformation than base asphalt. After warm mixing， there were more viscous components in the recycled asphalt. This resulted in superior low⁃temperature rheological performance. The regenerant supplemented the aromatic compounds of the aged asphalt effectively. The small molecular oil substances in the warm mixed recycled asphalt were well protected， and the generation of large molecular matter groups during the secondary aging was controlled.

Key words: road engineering, recycled asphalt, warm mixing agent, secondary aging, performance loss

CLC Number:

TQ321

SUN Jishu, PENG Junbo, ZHANG Min, GUO Yanfang. Preparation of waste oil/resin/dioctyl adipate composite regenerant and evaluation of protective effect of warm mixing agent on asphalt mixing aging[J]. China Plastics, 2024, 38(5): 100-106.

Figures/Tables 18

沥青

种类

针入度（25 ℃）/

0.1 mm

Tab.1. Technical indicators of the base and aged asphalt

闪点/

℃

Tab.2. Performance indicators of the waste engine oil and waste edible oil

外观	相对密度	凝固点/℃	闪点/℃	黏度/MPa·s
无色油状液体	0.93	-67	196	14

Tab.3. Performance indicators of the dioctyl adipate

软化点/℃	闪点/℃	酸值/mg KOH·g^-1	比重/g·cm^-3
115	255	>1.4	1.08

Tab.4. Performance indicators of the C9 petroleum resin

形态	密度/g·cm^-3	黏度（20℃）/MPa·s
棕褐色液体	0.9~0.96	520

Tab.5. Performance indicators of the surfactant DWMA⁃1

控制变量	名称	单位	低水平	高水平
A	基础油分	质量分数（%）	70	80
B	增塑剂	质量分数（%）	18	21
C	增黏树脂	质量分数（%）	5	9

Tab.6. Experimental factors and levels

序号	A/%	B/%	C/%	软化点/ ℃	针入度/ 0.1 mm	延度/ cm
1	70	19.5	9	51.4	71.2	31.8
2	80	21.0	7	50.1	67.3	67.7
3	70	21.0	7	50.5	75.2	22.0
4	70	18.0	7	50.5	85.7	36.7
5	75	19.5	7	50.3	82.4	46.1
6	80	19.5	5	48.4	80.8	35.4
7	70	19.5	5	49.5	67.5	27.9
8	80	19.5	9	50.9	66.4	52.3
9	75	21.0	9	50.8	72.1	43.4
10	75	21.0	5	48.8	77.1	45.0
11	75	19.5	7	50.3	82.6	46.1
12	75	19.5	7	50.4	81.4	47.1
13	75	19.5	7	50.3	82.4	46.1
14	80	18.0	7	50.2	72.2	30.2
15	75	18.0	9	51.1	69.5	58.0
16	75	19.5	7	50.3	82.4	46.1
17	75	18.0	5	49.7	89.1	38.5

Tab.7. Design of the response surface method test

模型	F值	P	$决定调整系数 (R 2)$	变异系数/%
针入度	3.68	0.049 7	0.825 7	5.850 0
软化点	44.16	<0.000 1	0.910 6	0.503 9
延度	10.87	0.002 4	0.933 2	9.500 0

模型	F值	P	$决定调整系数 (R 2)$	变异系数/%
针入度	3.68	0.049 7	0.825 7	5.850 0
软化点	44.16	<0.000 1	0.910 6	0.503 9
延度	10.87	0.002 4	0.933 2	9.500 0

Tab.8. Analysis of variance of the regression model

Fig.1. （a）Comparison of actual and predicted values of penetration，（b）comparison of actual and predicted values of softening point，（c）comparison of actual and predicted values of ductility

Fig.2. Response surface relationship of the penetration

Fig.3. Response surface relationship of the softening point

Fig.4. Response surface relationship of the ductility

Fig.5. Viscosity⁃temperature curves

Fig.6. G* and δ of the samples

Fig.7. （a） Stiffness modulus and （b） creep rate of the samples

Fig.8. Shear strain of the samples at （a）58 ℃ and （b） 64 ℃

Fig.9. FTIR spectra of the samples

沥青种类	I_C=O	I_S=O
OA	0.023 6	0.017 1
AA	0.045 3	0.038 2
RA	0.024 5	0.021 1
WMRA	0.028 3	0.023 7
HMRA	0.031 1	0.024 5

Tab.9. IC=O and IS=O of the samples

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