A kind of low rolling resistance modified asphalt mixture and preparation method thereof

Abstract

The invention relates to a low rolling resistance modified asphalt mixture and a preparation method thereof. The modified asphalt is prepared from an adhesive, an elastomer blend, multi-wall carbon nanotubes, a high polymer material internal lubricant, a rubber cross-linking agent and a stannous chloride vulcanizing agent. The preparation method comprises the following steps: firstly, crushing solution polymerized styrene-butadiene rubber into coarse particles and mixing the coarse particles with a thermoplastic elastomer according to equal proportions; uniformly stirring and then crushing a uniform mixture to obtain a subdivided polymer elastomer; secondly, mixing the subdivided polymer elastomer in the first step with hydroxyl multiwalled carbon nanotubes and a high polymer lubricant according to proportions; carrying out high-speed uniform stirring to obtain a low loss factor asphalt modifier; thirdly, heating the adhesive to certain temperature, adding the low loss factor asphalt modifier in the second step and grinding until no particles are found; finally, and adding the crosslinking agent and the vulcanizing agent at equal proportions for stirring, thereby obtaining the lowrolling resistance modified asphalt mixture. The low rolling resistance modified asphalt mixture disclosed by the invention has the advantages that the low rolling resistance performance of the asphalt is greatly improved while ensuring high complex modulus.

Description

technical field [0001] The invention relates to the technical field of building energy-saving materials, in particular to a low rolling resistance modified asphalt mixture and a preparation method thereof. Background technique [0002] With the development of high-grade highway construction, by the end of 2016, the total mileage of expressways in China had reached 135,000 kilometers, ranking first in the world. Various polymer-modified asphalts have been widely used, and the pavement performance of asphalt pavement has been greatly improved, but there is still little research on energy-saving, emission-reducing, green and long-life asphalt pavement. According to the national energy-saving, environmental protection, low-carbon, green transportation development strategy, and the improvement of people's awareness of energy conservation and environmental protection, more functional requirements are put forward for new pavement materials, such as fuel consumption of driving vehic...

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Problems solved by technology

Even for high modulus modified asphalt, although the complex modulus of modified asphalt has been greatly improved and has good anti-rutting ability, the phase angle is still between 60-80°, indicating that the ratio of viscous modulus to elastic modulus Larger, larger loss factor, higher dynamic heat generation. According to the law of energy conservation, the energy consumption of driving vehicles is higher. In addition, the dynamic heat generation of modified asphalt is high. Under the action of repeated loads, the internal temperature of the asphalt pavement rises It is easy to produce flow deformation, aggregate particles are displaced to form permanent deformation, and rutting disease occurs

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