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Research on Reagent of Viscosity-reducing for Asphalt and Technical Performance of the Warm Mix Asphalt

Author: LiuYong
Tutor: PeiJianZhong
School: Chang'an University
Course: Road and Railway Engineering
Keywords: warm mix technology thickened oil viscosity reduction technology SSM copolumer viscosity-reducing mechanism technical performance technical parameter
CLC: U414
Type: Master's thesis
Year: 2011
Downloads: 187
Quote: 4
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Abstract

At the end of the" 11th five-year plan" and the beginning of"12th five-year plan", China’s transportation business is on the way of rapid development. We will product billions tons of hot mix asphalt mixture in China each year. Large amount of pollution emissions of gases were piped away. As one country of the Kyoto protocol, we will face the force of energy and the environment, including in reducing emissions of greenhouse gases and atmospheric pollutants. The warm mix asphalt technology can reduce the viscosity of asphalt through some technical measures, thus it makes asphalt can be mixed at lower temperature, but the using performance is the same as hot mix asphalt.Base on the analysis and research of warm mix asphalt, and combine with oil-soluble viscosity reducer technology. This essay selected higher acrylic ester malefic anhydride and styrene which acted as monomers of polymerization for making SSM. Add the polymeric into the asphalt and research the influence of this process. In this essay, we study the influence of SSM to the mixture.The research showed that:the SSM copolymer can be prepared in laboratory, and the Infrared Spectrum analysis was used to study the Synthetic polymer. The result proved the existence of various functional characterization and copolymerization; Viscosity of asphalt decreased obviously with SSM copolymer adding into the matrix asphalt, and the viscosity difference varied with different content and ratio; Three indexes of modified asphalt were tested, The results showed that, compared to matrix asphalt, softening point of the matrix was reduced, and the Penetration and the Penetration index increased, and the extensibility increased; Grey relational analysis showed that anhydride volume in SSM copolymer made the greatest effect on viscosity difference, softening point and extensibility, and the penetration was influenced most by styrene. The fuzzy mathematical analysis indicated that the optimal mix for SSM was 5:3:3, and the content was 5%; The IR spectrum and the differential scanning calorimetric (DSC) amount analysis showed that, chemical reaction did not happen between SSM copolymer and matrix asphalt. SSM copolymer began to soften at 40℃.The viscosity degradation mechanism for SSM copolymer was to break up the asphalt-colloid overlapping layered structure, and the lightweight components in the original package network was released. SSM copolymer could reduce matrix asphalt viscosity. Compared to matrix asphalt, mixing and compaction temperature decrease ranged from 4 to 6℃for modified asphalt with 5% SSM additives. The mixing and compaction temperature was decreased by approximately 20℃for SBS &SSM copolymer composite modified asphalt compared to SBS modified asphalt; Laboratory test results showed the that the mixture mixing compaction temperature could be decreased by 20℃with 5% SSMS copolymer. Technical performance analysis showed that SSM copolymer modified asphalt showed good storage stability, and the aging test results met specification requirements, and the performance prosperities of modified asphalt at high and low temperature were both improved.In the study, SSM copolymer was added into matrix asphalt, and analyzes were performed on different content and mix on the viscosity and performance prosperities of modified asphalt, and evaluated the variation rules of technical parameters in subject to the content and mix. And the eassy suggested the reasonable admixture and mix of SSM copolymer. The study also discussed the viscosity damping mechanism. In this article thickened oil viscosity reduction technology was introduced into the petroleum, warm mix asphalt technical means has been enriched,and provided a guidance for the development of new warm mixed asphalt modification technology to apply organic viscosity damping products in warm mixed asphalt technology.

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