冻融损伤作用下玉米秸秆纤维再生沥青混合料耐久性能研究

打开文本图片集

中图分类号：U414 文献标志码：A 文章编号：1008-0562（2025）04-0463-08

Study on the durability ofcorn straw fiber recycled asphalt mixture under freeze-thaw damage

SHIZhenwu，GAOBo，XUChuanhao

（School of CivilEngineering and Transportation，NortheastForestryUniversity，Harbin15o040，China）

Abstract：Aiming at the problem that the fatigue resistance of recycled asphalt mixture decreases significantly under te conditionof freeze-thaw cycle，the effectsof corn straw fiber onthe adhesion，water stability and fatigue resistance of recycled asphalt mixture were studiedby carrying outcontactangle tests，freeze-thaw cycle splitting test and semi-circularbending fatigue test.Theresults show thatcorn straw fibersignificantly improves the hydrophilicityand internal structural integrityof recycled asphalt mixture，and plays a reinforcing role. When the freeze-thaw cycle is 1～40 times，the adhesion work of fiber modified mixture is 8.34% and 16.65% higher thanthatof matrix asphalt and recycledasphalt respectively.When the freeze-thaw cycle is 2O times，the performance stillmeets the specification requirements ;when the numberoffreeze-thaw cycles is 40，thesplitting strength reaches 0.67MPa ，which is 23.88% and 34.32% higher than that of matrix and recycled asphalt mixture， respectively.The fatigue life of 5 O17 times is 37.15% and 29.16% higher than that of matrix and recycled asphalt mixture，respectively. The fatigue life is 5 O17 times，which is 37.15% and 29.16% higher than that of matrix asphaltmixture and recycled asphalt mixture，respectively.The research conclusions can provide a direct reference for the material design and engineering application of recycled asphalt pavement in cold regions.

Keywords： pavement enginering;recycled asphalt mixture； freeze-thaw cycle； corn straw fiber;durability;splitting strength

0引言

随着交通量的不断增长，中国公路已全面进入大规模维修养护期。（剩余14045字）