Research on Composition Optimization and Performance of Composite Modified Asphalt Sealant

doi:10.12141/j.issn.1000-565X.220540

Abstract

Abstract:

Modified asphalt sealant has excellent repair effect and low production cost, and has been widely used in crack repair, but there are still problems such as insufficient adhesion, low flexibility and low durability. Thermoplastic vulcanized silicone (TPSiV) has the advantages of silicone rubber such as stable structure, good weather resistance, high strength and high elasticity of thermoplastic polyurethane, showing excellent adhesion, durability, flexibility and high and low-temperature stability. In this study, 90# matrix asphalt was used as the main raw material. Firstly, furfural extraction oil (FEO) was used to pre-swelling TPSiV, and then high-speed shear method was used to prepare a series of high efficiency composite modified asphalt sealant by adding styrene-butadiene-styrene (SBS), waste rubber powder (CR), CaCO₃ and other modifiers. The effects of SBS, TPSiV, CR content and CR particle size on the properties of modified asphalt sealant were systematically studied. Finally, the formula was verified through the indicators of the whole set of sealant. The thermal storage stability of the sealant was characterized by softening point difference method. The microstructure of TPSiV and TPSiV modified asphalt was observed by fluorescence microscope and scanning electron microscope. The IR spectra of asphalt before and after modification were characterized by Fourier infrared spectroscopy (FTIR).The results show that the increase of SBS content significantly improves its high temperature performance, and the best dosage is 3%. TPSiV improves the flexibility and cohesiveness of sealant, and the best dosage is 3%. With the decrease of CR particle size, the high-temperature performance is improved, while the low-temperature performance is decreased. The optimal particle size is 40 mesh. With the increase of CR content, the high-temperature performance of modified asphalt is improved, and the best dosage is 22%. The best sealant formula SBS∶TPSiV∶CR∶CaCO₃∶FEO mass ratio is 5∶3∶22∶5∶3, which meets the requirements of storage stability. TPSiV has a rough surface structure and the surface attached with silicone rubber particles is conducive to its adhesion to asphalt, and TPSiV disperses evenly in the composite modified asphalt. Chemical modification and physical modification of TPSiV compound modified asphalt exist simultaneously.

Key words: thermoplastic silicone vulcanizate, bituminous sealant, road crack, thermal storage stability, low-temperature performance

CLC Number:

TU533

XIA Huiyun, YANG Haotian, LU Changjie, et al. Research on Composition Optimization and Performance of Composite Modified Asphalt Sealant[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(6): 136-145.

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指标	试验结果	标准值	实验方法
软化点/℃	44.3 ℃	≥44 ℃	T 0606—2011
针入度（25 ℃，100 g，5 s）/0.1 mm	90	80~100	T 0604—2011
延度（15 ℃，5 cm/min）/cm	≥150	≥100	T 0605—2011
针入度指数	-1.5	-1.5~1.0	T 0604—2011
RTFOT质量变化	-0.2%	-0.8~0.8	T 0610—2011
RTFOT残留针入度比（25 ℃）	59.3%	≥57	T 0604—2011
RTFOT残留延度（10 ℃）/cm	9	≥6	T 0605—2011
RTFOT残留延度（15℃）/cm	9.1	实测值	T 0605—2011

指标	试验结果	试验方法
密度/（g·cm^-3）	1.1	ISO 1183
弯曲模量/MPa	22.4	ISO 178
泰伯耐磨性/mg	89	ASTM D1044
拉伸强度/MPa	5.2	ISO 37
100%定伸应力/MPa	2.2	ISO 37
断裂伸长率/%	600	ISO 37
硬度（邵氏A，15 s）	62	ISO 868
溶体流动速率/（g·（10 min）^-1）	20	ISO 1133

m（SBS∶TPSiV∶CR∶CaCO₃∶FEO）	锥入度/0.1 mm	软化点/℃	低温拉伸	弹性恢复率/%	流动值/1 mm	类型
	≤70	≥90	0 ℃，25%，3次循环，通过	30~70	≤3	高温型指标
	50~90	≥80	-10 ℃，50%，3次循环，通过	30~70	≤5	普通型指标
5∶0∶20∶5∶3	66.8	83	未通过	60.1	2.5	无
5∶2∶20∶5∶3	63.2	88	未通过	60.1	2.3	无
5∶2∶20∶5∶3	61.8	89	未通过	64.3	3.5	无
5∶3∶20∶5∶3	62.4	87	通过	69.3	4.1	普通型
5∶4∶20∶5∶3	58.7	92	通过	67.7	3.2	高温型
5∶5∶20∶5∶3	64.0	89	通过	64.6	3.0	普通型
5∶3∶16∶5∶3	63.2	88	通过	60.1	4.2	普通型
5∶3∶18∶5∶3	61.8	89	通过	64.3	3.8	普通型
5∶3∶22∶5∶3	58.7	93	通过	67.7	2.5	高温型、普通型
5∶3∶24∶5∶3	64.0	91	通过	64.6	2.6	高温型、普通型

样品	B_t/℃	B_b/℃	ΔB/℃
a1	86.9	84.9	2.0
a2	85.0	82.4	2.6
a3	58.7	58.6	0.1

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