摘要
选择以木屑为原材料生产出的生物质重油,将其加入50号基质沥青,并掺入外掺剂,制备不同生物质重油掺量的生物沥青,对RTFO老化前后生物沥青样品的针入度、软化点、延度(10℃)、质量变化进行分析,通过结合料试验优选出符合规范要求的生物沥青结合料,然后制备生物沥青混合料并对其进行车辙试验、冻融劈裂试验、小梁弯曲试验和低温黏结性试验等,考察生物质重油掺量变化对生物沥青混合料路用性能的影响。结果表明:随着生物质重油掺量的增加,生物沥青的针入度增加、软化点降低、延度增加,高温性能受到一定程度的影响,但低温抗裂性能得到提高;与50号基质沥青混合料相比,生物质重油掺量(w)为10%的生物沥青混合料的最大弯拉应变比提高20.90%,低温性能有所提高,冻融循环后的劈裂抗拉强度提高12.56%,水稳定性有所提高,黏附性能大幅提高,高温性能有所降低;生物质重油掺量(w)为10%的生物沥青混合料的各项指标均满足《公路工程沥青及沥青混合料试验规程》(JTG E20—2011)的要求。
Bio-oil was prepared using wood powder, and then mixed with 50# asphalt product and additives to obtain bio-binders with different bio-oil/asphalt ratios. The penetration,softening point,duetility（10℃）and other properties of the samples before and after RTFO aging were investigated. The bio-binder meeting the requirements of the specification was selected followed by preparation of bio-binder mixture. The rutting test, freeze-thaw splitting te s t, small beam bending te s t, low temperature bonding test were conducted for the mixture to investigate the effect of the amount of bio-oil blended into asphalt on the performance of the road bio-binder. The results showed that with increasing the bio-oil amount added,the penetration and ductility along with the low temperature crack resistance are improved; the softening point is reduced,indicating the negative effect for the high temperature performance. Compared with that of 50 ^asphalt mixture, the maximum bending strain ratio of the bio-binder mixture with 10% w bio-oil is improved by 20. 90 % , the splitting tensile strain of freeze-thaw cycle samples increases by 12. 56%, the water stability and low temperature performance are all improved; the bond ability is im-proved greatly while the high temperature performance is decreased in some extent. The properties of bio-binder mixture satisfies with the requirements of specification（JTG E20-2011）when the bio-oil content is 10%.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2017年第10期46-51,共6页
Petroleum Processing and Petrochemicals
基金
国家自然科学基金项目(51378074
51578075)
交通运输部应用基础研究项目(2014319812180)
