纳米二氧化硅与SBR复合改性乳化沥青的性能研究

用差示扫描量热法（DSC）对纳米二氧化硅与SBR复合改性乳化沥青蒸发残留物的热性能进行研究。结果表明，加入SBR乳液、纳米二氧化硅后样品的温度稳定性和耐高温性能均得到提高；其中SBR（质量分数0.03）加纳米二氧化硅（质量分数0.000 5）复合改性效果最佳。纳米二氧化硅与SBR形成网状结构以及SBR在体系中吸附油分后的溶胀作用是沥青性能改善的主要原因。;The thermal properties of evaporation residue of emulsion asphalt modified by nano-silica/SBR composite were investigated by DSC.The results showed that the thermal stability and resistance to elevated temperatures of the emulsion asphalt were improved when modified by nano-silica or SBR；the optimal modified composite was SBR(mass fraction 0.03)/nano-silica(mass fraction 0.000 5).The mainly reasons for the properties improvement of asphalt were the reticular construction of nano-silica/SBR and the swelling of the SBR after oil absorption in the system