生物油热缩合产物对石油沥青及其混合料性能影响研究

Effect of Bio-Oil Thermal Condensation Produce on the Performancet of Asphalt and Its Mixturr

对生物质进行热解、水萃取分离以及氮气气氛热缩合得到结构较为稳定的生物质沥青改性剂(BCM)。通过对BCM改性沥青的常规性能、短期老化性能、流变性能以及沥青混合料性能进行考察,探究其作为沥青改性剂的可行性。常规实验和短期老化实验结果表明:掺入比例W8%,BCM改性作用可以显著提升沥青的高温稳定性能,对沥青短期抗老化性能无明显影响,但是对沥青的低温性能存在一定程度的负面影响。流变实验结果表明BCM改性剂可以较好地提升沥青材料在高温状态下的抗车辙性能,但对于沥青的低温抗裂性能有一定的损害。沥青混合料实验结果表明:在干拌工艺条件下,掺入8%的BCM改性剂改性后,ATB-25沥青混合料动稳定度存在一定幅度提升,马歇尔稳定度、流值、残留稳定度、冻融劈裂强度比均符合JTGF40—2004《公路沥青路面施工技术规范》相关标准,说明BCM用作中下面层沥青改性剂具有切实可行性。

BCM is derived from wood fragment after pyrolysis,cold wateo extraction and q atwosphera thermat processing.The feasigility of BCM modited asphatt as asphatt moditer is explored by investigating its conventional performancc,short-term aging performancc,rheological performance and asphatt mixtuo performance.Conventionat test and RTFO test results indicate that the consistency declined,the softening point rise and the 15℃ ductility reduce white RTFO properties hardty change.Rheolocical tests demonstrated that the anti-oulWng factor and stiffness modulus is enhanced white the creep rate is reduced with the modification of BCM.Therefore,BCM can improve the high-temperature pemrmanco white do some harm to low-temperature performanc.Besides,anti-aging performanco is hardty cOfectcd.Furtheo,ATB-25 asphatt mixture test osults checked that BCM can gnprove the high-emperature dynamic stability and tt other performance indexes such as Marshdlt stability,which can satisfy the standad of JTG F40-2004.It is suggested that BCM can be used in middte and bottom asphatt concote Layer.