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通过研究,将纳米CaCO3、5%的SBS以及基质沥青进行不同剂量的调配,并使用常规的试验方法对配制成的几种改性沥青测量其各项宏观性能指标。对比评价纳米CaCO3/SBS复合改性沥青的常规技术性能,确定纳米CaCO3的最佳含量,同时通过粘度和共混机理对纳米CaCO3/SBS改性沥青的微观结构与改性机理进行研究与探讨,得出结论:总体上纳米CaCO3/SBS改性沥青的一些性能,如温度敏感性、低温等与纳米CaCO3的剂量呈正相关关系。尤其是5℃延度表现的比较明显,最高达到了40cm以上。然而,纳米CaCO3/SBS改性沥青的软化点则伴着纳米CaCO3剂量的增加而有所下降,但变化甚微,因此认为其高温性能变化不大。综合考虑确定SBS和纳米CaCO3剂量均在5%的情况下,纳米CaCO3/SBS改性沥青的性能达到了很好的效果。
Through the research, the nano-CaCO3, 5% SBS and matrix asphalt were mixed with different dosage, and the macroscopic performance indexes of the prepared modified asphalt were measured by the conventional test methods. By comparing the conventional technical performance of nano-CaCO3 / SBS modified bitumen and determining the optimum content of nano-CaCO3, the microstructure and modification mechanism of nano-CaCO3 / SBS modified bitumen were studied and studied by means of viscosity and blending mechanism. Conclusions: In general, some properties of nano-CaCO3 / SBS modified asphalt, such as temperature sensitivity, low temperature and the dose of nano-CaCO3 showed a positive correlation. In particular, 5 ℃ ductility performance is more obvious, up to 40cm or more. However, the softening point of nano-CaCO3 / SBS modified asphalt decreased with the increase of the dose of nano-CaCO3, but little changed, so the change of high temperature performance was not obvious. Considering that the dosage of SBS and nano-CaCO3 are both 5%, the performance of nano-CaCO3 / SBS modified asphalt has achieved good results.