ABSTRACT

This study is to characterise rheological properties of sulfur-extended asphalts with/without crumb rubber at high, intermediate, and low temperatures using standard asphalt binder tests. Four dosages of sulfur (i.e. 0%, 15%, 30% and 45%) by weight of neat asphalt binder were used. The results indicated that a low level of sulfur addition, such as 15%, softened original asphalt binder. When the sulfur dosage was larger than 15%, the extra sulfur would act as fillers to stiffen asphalt binder. The addition of crumb rubber significantly increased high temperature performance grade. For sulfur-extended asphalts with/without crumb rubber, an increase in the sulfur dosage resulted in an increase of low temperature performance grade. Sulfur-extended asphalt with 15% sulfur exhibited the largest non-recovery creep compliance (Jnr) value, while the 30% and 45% exhibited the lowest values since more extra sulfur acts as fillers to stiffen asphalt binder. The addition of sulfur significantly decreased viscosity. The semi-circular bending fracture test results indicated that the mixture with the addition of 15% sulfur was softer and behaved in a more ductile manner than the others, which is consistent with the asphalt binder test results of high temperature performance grade and non-recovery creep compliance.

摘要

本研究旨在使用标准沥青粘合剂测试来表征含/不含粒状橡胶的硫磺膨胀沥青在高温、中温和低温下的流变性能。使用按重量计纯沥青粘合剂的四种硫剂量（即 0%、15%、30% 和 45%）。结果表明，低水平的硫添加，例如 15%，软化了原始沥青粘合剂。当硫磺用量大于15%时，多余的硫磺会起到填料的作用，使沥青结合料变硬。粒状橡胶的加入显着提高了高温性能等级。对于含/不含粒状橡胶的加硫沥青，硫用量的增加导致低温性能等级的提高。硫含量为 15% 的硫磺沥青表现出最大的非恢复蠕变柔量 (Jnr) 值，而 30% 和 45% 的值最低，因为更多的额外硫作为填料来硬化沥青粘合剂。添加硫显着降低粘度。半圆弯曲断裂试验结果表明，添加 15% 硫的混合料比其他混合料更软，延展性更强，这与高温性能等级和不可恢复的沥青结合料试验结果一致。蠕变顺应性。