基于PG分级的高寒高海拔地区沥青结合料性能与适应性
Asphalt Binder Property and Adaptability Based on PG Grading in Severe Cold and High Altitude Regions
李东钊 1龚演 1严二虎 1田波 1权磊1
作者信息
- 1. 交通运输部公路科学研究院,北京 100088
- 折叠
摘要
为解决高寒高海拔地区沥青结合料性能不足的问题,结合京藏高速公路格尔木至那曲段地形地貌与气候变化特点,依托沿线多个气象观测站的30 a气象资料,对所处地貌、气候特征、海拔、交通荷载量等相关数据进行统计学分析、计算,探索高海拔大温差地区沥青胶结料PG分级方法的适应性.结果表明:基于青藏地区现场监测结果对LTPP高温温度计算模型进行修正,提出了更适合高寒高海拔地区沥青结合料高温温度计算公式,提高了沥青高温性能指标计算公式的可靠性;在京藏高速公路格拉段对沥青胶结料的PG分级建议值最高达到PG76-22,在高寒高海拔地区应充分考虑海拔增高对沥青低温抗裂性能的影响,将低温等级提高1～2级;在那曲地区建议使用SBRⅡ-A改性沥青,在格尔木地区建议使用SBS改性沥青;在沱沱河、五道梁地区,建议开发抗紫外温拌改性沥青,采用更高标号的基质沥青对沥青进行SBS/SBR复合改性,并进行适用性研究.本次研究成果为高寒高海拔地区沥青结合料的材料开发技术、施工工艺提升及工程化应用提供一定参考,有利于提高沥青路面修建质量,延长使用寿命.
Abstract
To solve the problem of insufficient performance of asphalt in the severe cold and high altitude regions,based on the characteristics of topography,geomorphology and climate,and relying on the 30-year meteorological data observed by several meteorological observation stations along the Golmud-Nagqu section of Beijing-Tibet expressway,the statistical analysis and calculation were carried out on the geomorphology,climatic characteristics,altitude,and traffic load data.The adaptability of PG grading method for asphalt binder in high-altitude regions with large temperature differences was explored.The result indicates that the LTPP high temperature calculation model is modified based on the field monitoring results in Qinghai-Tibet region.The formula for calculating high temperature of asphalt binder in this region is proposed to improve the reliability of the formula.In Golmud-Nagqu section,the recommended PG classification value of asphalt binder reaches the highest PG 76-22.In the severe cold and high altitude region,the effect of elevation increase on low temperature cracking resistance of asphalt should be fully considered.The low temperature grade should be increased by 1 to 2 grades.It is recommended to use SBR Ⅱ-A modified asphalt in Nagqu area,and to use SBS modified asphalt in Golmud area.In Tuotuohe and Wudaoliang areas,it is recommended to develop UV-resistant modified asphalt,and use higher grade base asphalt to carry out SBS/SBR composite modification on asphalt for its applicability study.The study result provides basis for the material development technology,construction technology improvement and engineering application of asphalt binder in severe cold and high altitude regions.It is conducive to improving the construction quality of asphalt pavement,and extending the service life.
关键词
道路工程/高低温性能/PG分级/沥青/公路战略研究计划(SHRP)Key words
road engineering/high and low temperature properties/PG grading/asphalt/strategic highway research program(SHRP)引用本文复制引用
出版年
2024
NETL
NSTL
万方数据