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Abstract

SBS modifiers can effectively improve the high-temperature performance of rubber asphalt and its mixtures. By taking the softening point and viscosity as the indicators characterizing the high-temperature performance of asphalt, various processes were designed to prepare composite rubber asphalt (CR/SBS). Finally, the optimal preparation process of composite rubber asphalt was selected based on the high-temperature performance. On this basis, the contents of CR and SBS and the mesh size of rubber powder of composite rubber asphalt were determined through orthogonal experiments. The influence of the number of heating times on the performance of composite rubber asphalt was explored. The results show that the optimal preparation process of composite rubber asphalt is as follows: the rubber powder and SBS are added to the asphalt simultaneously and stirred until a uniform solution is formed. The solution is then sheared at 180 °C for 30 minutes, then stirred for another 30 minutes, and finally swell in an oven for 30 minutes. The optimal material composition of CR/SBS is 17% rubber powder, 2% SBS, and 40-mesh rubber powder. After multiple heating, the high-temperature performance of the three types of asphalt all decline to a certain extent, but the decline is not obvious. The softening point difference of CR/SBS is greater than 10 °C, and the stability is poor. The stability of the other two types of asphalt is relatively good. Through microscopic observation, after multiple heats, the SBS modifier and adhesive powder in CR/SBS change from an aggregated state to a dispersed state and accumulate at the bottom.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.040

First Page

225

Last Page

230

Submission Date

May 2025

Reference

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