摘要
为改善SBR改性沥青的高温性能,选取纳米CaCO3作为改性剂,制备纳米CaCO3/SBR复合改性沥青。通过室内试验,评价了纳米CaCO3/SBR复合改性沥青及混合料的高温性能。结果表明:随着纳米CaCO3掺量的增加,纳米复合改性沥青的软化点、当量软化点、135℃运动粘度明显增大,延度则呈现先上升后下降的趋势;原样及老化状态下,纳米CaCO3/SBR复合改性沥青的车辙因子均远远高于SBR改性沥青;与SBR改性沥青混合料相比,纳米CaCO3/SBR复合改性沥青混合料的动稳定度提高了38.2%,流变次数Fn、流变时间Ft分别提高了34.5%、63.2%,破坏弯拉应变虽稍有下降,但仍能满足夏炎冬寒地区的要求。因此,采用纳米CaCO3改善SBR改性沥青的高温性能是可行的。
In order to improve the high-temperature property of SBR modified asphalt, the nano-CaCO3/SBR modified asphalt was prepared while taking nano-CaCOa as modifier. The high-temperature performance of nano-Ca- CO3/SBR modified asphalt and mixture were studied by laboratory experiments. The results show that with the in- crease dosage of nano-CaCOa, the softening point, the equivalent softening point T800, the 135 ℃ kinematic viscosity of nano-CaCOa/SBR modified asphalt increase obviously, while the 5℃ ductility rise in the first stage and then decrease. The rutting factor of nano-CaCO3/SBR modified asphalt is far higher than that of SBR modified asphalt whether they are in the original condition or aging condition. The dynamic stability, the flow number Fn, the flow time Ft of nano-CaCOa/SBR modified asphalt mixture are 38. 2%, 34. 5% and 63.2%higher than those of SBR modified asphalt mixture. The failure strain of nano-CaCOa/SBR modified asphalt mixture decrease slightly, but still meet the specification requirement of cold region. Therefore, using nano-CaCOa to improve the high-temperature performance of SBR modified asphalt is feasible.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2016年第8期122-126,共5页
Materials Reports
基金
陕西省交通科技项目(13-01K)
