Study on Processing Rheological Properties of High Content Desulfurization Rubber Modified Asphalt
The desulfurization process can effectively solve the bottleneck of rubber modified asphalt(RMA)development for the small rubber dosage and large pollution,but high-doped crumb rubber desulfu-rization modified asphalt processing and flow change performance are still unclear.In this paper,the influence of the degree of crumb rubber desulfurization and the content of crumb rubber on the rheological properties of RMA was investigated based on rheological indicators,and the optimal desulfurization degree and rubber pow-der content were determined.The results indicated that the crumb rubber desulfurization process can reduce the construction temperature of RMA,which can be reduced by about 20 ℃ with the same rubber powder con-tent.At the same time,the crumb rubber desulfurization process improved the storage stability of RMA.The SI index of DRMA under the same rubber powder content was only 1/3 of RMA.Comprehensively comparing the rheological indicators,it was recommended that the optimum crumb rubber desulfurization degree was a-chieved the when Mooney viscosity of the rubber powder was ML60,and the optimum DVR dosage was 30wt％～40wt％.
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