Experimental study on road performance of modified corn stalk fiber SMA-13

QU Lu; WANG Kun; ZHU Yuzhu; LI Xiongao

doi:10.3969/j.issn.1672-0032.2025.01.009

Abstract：To study the effect of modified corn straw fibers on the performance of stone matrix asphalt(SMA)-13,modified corn straw fibers are added to the asphalt mixture.Under different mass fractions(0.2％,0.4％,0.6％,0.8％,1.0％)and lengths(3,6,9 mm)of the modified corn straw fibers,the asphalt mixture is subjected to rutting tests,beam bending low-temperature tests,freeze-thaw splitting tests,and surface performance tests.The results show that the addition of modified corn straw fibers can effectively improve the dynamic stability,maximum tensile strain,and freeze-thaw splitting strength ratio of the asphalt mixture,while reducing the rut depth caused by repeated loading.When the mass fraction of modified corn straw fibers is low,the performance of the asphalt mixture improves with the increase in fiber length.When the mass fraction of modified corn straw fibers is high,the performance of the asphalt mixture first increases and then decreases with the increase in fiber length.When the lengths of the modified corn straw fibers are the same,as the mass fraction increases,the performance of the asphalt mixture first enhances and then weakens.For modified corn straw fibers with lengths of 3,6,and 9 mm,the best performance is achieved at mass fractions of 0.8％,0.6％,and 0.4％,respectively,with the best performance observed in the asphalt mixture containing 6 mm long modified corn straw fibers at a mass fraction of 0.6％.