Modified asphalt

The invention discloses modified asphalt which comprises 100-110 parts of matrix asphalt in parts by weight, and further comprises a styrene-butadiene-styrene block copolymer with the mass fraction of2-5%, an asphalt modifier with the mass fraction of 3-9%, an anti-ultraviolet agent with the mass fraction of 0.8-2.6% and a coupling agent with the mass fraction of 5-13% on the basis of the weightof the matrix asphalt, wherein the asphalt modifier comprises sodium dodecyl benzene sulfonate, furan resin and water; and the mass ratio of the sodium dodecyl benzene sulfonate to the furan resin tothe water is (21-27): (3-15): (0.1-3). The weather resistance of the modified asphalt is remarkably improved, and the service life of the modified asphalt is prolonged. 本发明公开了一种改性沥青，包括：基质沥青100-110重量份，以基质沥青重量为基础，还包括质量分数2～5％的苯乙烯-丁二烯-苯乙烯嵌段共聚物、3-9％的沥青改性剂、0.8-2.6％的抗紫外剂、5-13％的联结剂；所述沥青改性剂包括十二烷基苯磺酸钠、呋喃树脂和水；十二烷基苯磺酸钠、呋喃树脂和水的质量比为21-27∶3-15∶0.1-3。本发明显著增加了改性沥青的耐候性，增加了其使用寿命。