Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 6: 136 - 145

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

Materials Science & Technology

Research on Composition Optimization and Performance of Composite Modified Asphalt Sealant

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  • College of Materials Science and Engineering，Chang’an University，Xi’an 710064，Shaanxi，China
夏慧芸（1981-），女，博士，副教授，主要从事交通功能材料研究。

Received date: 2022-08-22

  Online published: 2022-11-16

Supported by

the Science and Technology Project of Zhejiang Provincial Transportation Department(2021012);the Special Fund for Basic Scientific Research of Central Universities of Chang’an University(300102310301)

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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

Cite this article

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), 2023 , 51(6) : 136 -145 . DOI: 10.12141/j.issn.1000-565X.220540

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