Determination of optimum dosage of high⁃viscosity⁃modified asphalt based on silane⁃coupling⁃agent⁃modified montmorillonite/SBS/HVA blends and its performance

doi:10.19491/j.issn.1001-9278.2024.03.004

Abstract

Abstract:

Using the Box⁃Behnken’s response surface method and taking the dosages of silane⁃coupling⁃agent⁃modified montmorillonite， SBS， and high viscosity agent （HVA） as influence factors for asphalt， a model was established to determine the optimal dosages of three types of raw materials in the asphalt based on the Brinell viscosity at 170 ℃ as an evaluation criterion. The results indicated that the high⁃viscosity⁃modified asphalt containing 5 wt% SBS， 9 wt% HVA， and 8 wt% modified montmorillonite exhibited the best performance， and its penetration， ductility， softening point， and Brinell's viscosity at 170 ℃ were determined to be 4.52 mm， 42.9 cm， 86.1 ℃， and 2.371 Pa·s， respectively. Dynamic shear and Brinell's viscosity tests show that， compared to the pristine asphalt and the high⁃viscosity⁃modified asphalt TPS， the addition of modified montmorillonite greatly improved the high⁃temperature performance and rutting resistance of asphalt， resulting in a significant improvement in the viscosity. The functional groups were analyzed by Fourier⁃transmission infrared spectroscopy. The disappearance of the vibration peaks indicated that the silane coupling agent involved a chemical reaction with montmorillonite in the modification process.

Key words: modified bitumen, box?behnken, silane coupling agent, modified montmorillonite

CLC Number:

TQ325.2

SUN Jishu, PU Xiatian, YANG Kai, JIN Canzhang. Determination of optimum dosage of high⁃viscosity⁃modified asphalt based on silane⁃coupling⁃agent⁃modified montmorillonite/SBS/HVA blends and its performance[J]. China Plastics, 2024, 38(3): 18-25.

Figures/Tables 14

因素	水平
因素	-1	0	1
SBS掺量（A）/%	4	5	6
HVA掺量（B）/%	6	8	10
G⁃OMMT掺量（C）/%	4	8	12

Tab.1. Test factors and levels

序号	SBS/%	HVA/%	G⁃OMMT/%	针入度/0.1 mm	延度/cm	软化点/℃	170 °C布氏黏度/Pa·s
规范要求				$≥ 4$ 0	$≥$ 30	$≥$ 80	$≤$ 3
1	6	10	8	42.8	45.3	88.9	2.613
2	5	8	8	46.1	41.5	84.5	2.111
3	6	8	4	43.7	38.7	82.9	2.044
4	5	8	8	45.6	40.8	83.9	2.184
5	6	8	12	39.4	34.8	87.6	2.467
6	5	8	8	45.8	38.6	83.3	2.152
7	5	10	12	41.4	43.1	89.1	2.621
8	5	10	4	45.2	47.4	85.2	2.459
9	4	10	8	45.6	44.1	86.1	2.371
10	4	8	12	43.3	36.5	83.5	2.226
11	4	6	8	48.1	35.3	75.6	1.875
12	4	8	4	50.2	41.6	77.7	1.921
13	6	6	8	43.0	35.3	81.3	1.995
14	5	8	8	46.3	42.2	83.8	2.183
15	5	6	4	48.4	38.1	74.6	1.839
16	5	8	8	45.9	41.7	83.2	2.251
17	5	6	12	41.1	34.9	82.6	2.209

序号	SBS/%	HVA/%	G⁃OMMT/%	针入度/0.1 mm	延度/cm	软化点/℃	170 °C布氏黏度/Pa·s
规范要求				$≥ 4$ 0	$≥$ 30	$≥$ 80	$≤$ 3
1	6	10	8	42.8	45.3	88.9	2.613
2	5	8	8	46.1	41.5	84.5	2.111
3	6	8	4	43.7	38.7	82.9	2.044
4	5	8	8	45.6	40.8	83.9	2.184
5	6	8	12	39.4	34.8	87.6	2.467
6	5	8	8	45.8	38.6	83.3	2.152
7	5	10	12	41.4	43.1	89.1	2.621
8	5	10	4	45.2	47.4	85.2	2.459
9	4	10	8	45.6	44.1	86.1	2.371
10	4	8	12	43.3	36.5	83.5	2.226
11	4	6	8	48.1	35.3	75.6	1.875
12	4	8	4	50.2	41.6	77.7	1.921
13	6	6	8	43.0	35.3	81.3	1.995
14	5	8	8	46.3	42.2	83.8	2.183
15	5	6	4	48.4	38.1	74.6	1.839
16	5	8	8	45.9	41.7	83.2	2.251
17	5	6	12	41.1	34.9	82.6	2.209

Tab.2. Table of results of Box⁃Behnken method tests

模型	F	P	（P）	$R 2$	C.V./%
针入度	89.79	<0.000 1	0.124 1	0.991 4	0.88
延度	13.91	0.001 1	0.561 1	0.947 0	3.36
软化点	112.56	<0.000 1	0.312 4	0.985 4	0.75
170 °C布氏黏度	42.94	<0.000 1	0.592 9	0.982 2	2.18

模型	F	P	（P）	$R 2$	C.V./%
针入度	89.79	<0.000 1	0.124 1	0.991 4	0.88
延度	13.91	0.001 1	0.561 1	0.947 0	3.36
软化点	112.56	<0.000 1	0.312 4	0.985 4	0.75
170 °C布氏黏度	42.94	<0.000 1	0.592 9	0.982 2	2.18

Tab.3. Regression model analysis of variance table

Fig.1. Comparison of actual and predicted values of each property

Fig.2. Interaction between factors of needle penetration

Fig.3. Interaction between factors at the softening point

Fig.4. Interaction between the factors of ductility

Fig.5. Interaction between factors of Brinell viscosity at 170 °C

项目	目标	低限	高限
A：SBS	5 %	4	6
B：HVA	望小	6	10
C∶G⁃OMMT	在一定范围内	4	12
针入度	望大	39.4	50.2
延度	望大	34.8	47.4
软化点	望大	74.6	89.1
170 °C布氏黏度	望大	0	3

Tab.4. Multi⁃response surface optimisation treatment table

项目	预测值	GM⁃HVA	M⁃HVA	TPS
针入度/0.1mm	45.9	45.2	46.8	47.4
延度/cm	43.2	42.9	34.3	37.5
软化点/℃	84.5	85.2	83.5	82.8
170 °C布氏黏度/Pa·s	2.276	2.371	2.111	1.677

Tab.5. Experimental results of high viscosity modified asphalt with the optimal content

Fig.6. Plots of complex shear modulus and phase angle curves

Fig.7. Rutting factor graph

Fig.8. Brinell viscosity curves at different temperature

Fig.9. Infrared spectroscopy of the three materials

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