Abstract

To improve the performance of asphalt, the modified asphalt was prepared by adding styrene-butadiene-styrene block copolymer (SBS) and sulfur powders into the base asphalt. The storage behavior of asphalts was tested to optimize the quality of adding SBS and sulfur. The storage stability and viscoelastic properties of modified asphalts were also studied. The results showed that under the proportioning final addition of SBS and sulfur, the storage stability, the high and low-temperature performance of asphalt was greatly improved, making it possible to meet the stability requirements for high-temperature storage of asphalt. Additionally, only a small amount of acidic sulfur-containing gas such as H₂S escaped during the modification process. The microscopic observation showed that the “sea-islands” form of SBS-modified asphalt was changed to a uniform and continuous dual-phase structure after sulfur addition. Finally, it was proposed that sulfur induced the chemical reaction between SBS and asphalt to form a stable network structure, which was the intrinsic mechanism to improve the performance of asphalt.

中文翻译：

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SBS/硫复合改性沥青的机理及性能研究

摘要

为提高沥青的性能，在基层沥青中加入苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）和硫磺粉制备改性沥青。测试了沥青的储存行为以优化添加 SBS 和硫磺的质量。还研究了改性沥青的储存稳定性和粘弹性能。结果表明，在SBS和硫磺的配比最终添加下，沥青的储存稳定性、高低温性能有较大的提高，可以满足沥青高温储存的稳定性要求。此外，只有少量的酸性含硫气体如 H ₂S在修改过程中逃逸。微观观察表明，SBS改性沥青的“海岛”形态在加硫后转变为均匀连续的双相结构。最后提出硫诱导SBS与沥青发生化学反应形成稳定的网络结构，这是提高沥青性能的内在机制。