Stability Evaluation Indexes of Emulsified Asphalt for Cold Regeneration

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Stability Evaluation Indexes of Emulsified Asphalt for Cold Regeneration

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[1]WANG Decai,HAO Peiwen,SUN Yang,et al.Stability Evaluation Indexes of Emulsified Asphalt for Cold Regeneration[J].Journal of Zhengzhou University (Engineering Science),2021,42(01):82-88.[doi:10.13705/j.issn.1671-6833.2021.01.011]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 42 Number of periods: 2021 01 Page number: 82-88 Column: Public date: 2021-03-14

Title:: Stability Evaluation Indexes of Emulsified Asphalt for Cold Regeneration

Author(s):: WANG Decai1; 2; HAO Peiwen3; SUN Yang2; LI Ruixia2; 1.School of Civil Engineering and Communication,North China University of Water Resources and Electric Power, Zhengzhou 450045，China; 2.School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China; 3.Key Laboratory of Highway Engineering in Special Region of Ministry of Education，Chang′an University，Xi′an 710064，China

Keywords:: cold regeneration; emulsified asphalt; stability; particle size; Zeta potential; interfacial tension; grey entropy correlation analysis

CLC:: U414

DOI:: 10.13705/j.issn.1671-6833.2021.01.011

Abstract:: Aiming at the stability of emulsified asphalt for cold regeneration, laboratory tests were carried out on the types and dosage of emulsifier, particle size, Zeta potential and interfacial tension of SBR modified emulsified asphalt, and the index requirements for characterizing the stability of emulsified asphalt were put forward. The results showed that the particle size and distribution of the emulsified asphalt prepared by different emulsifier types were different. With the increase of the amount of emulsifier, the average particle size, D90 and ununiformity coefficient regeneration and the stability increased. The type and amount of emulsifier had a significant effect on the Zeta potential and interfacial tension. As the amount of emulsifier increased, the Zeta potential increased significantly and the interfacial tension decreased. When the amount reached a certain level, the emulsion stability tended to be stable. The particle size and distribution of SBR modified emulsified asphalt were basically the same as those before unmodified, but the Zeta potential increased, and the storage stability slightly reduced. The grey entropy correlation analysis showed that the interfacial tension and particle size ununiformity coefficient had the best correlation with the stability of emulsified asphalt, followed by D90 and average particle size, and the Zeta potential had the smallest. It was recommended that when D90≤7 μm, average particle size ≤4 μm, ununiformity coefficient ≤4, Zeta potential>28 mV, interfacial tension <3.3 mN/m, it could meet the stability requirements of the current specification.

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Last Update: 2021-03-15