Effect of modified corn straw fiber on the performance of asphalt mixture and the evaluation method for its dispersion uniformity
LI Qiangfei
WANG Kun
XIE Dandan
SUN Xingchen
JIANG Ziyu
GUO Renliang
LIU Yingchang
Abstract：To study the effect of the quality fraction of modified corn straw fibers on the high and low temperature performance of asphalt mixtures and the uniformity of fiber dispersion,asphalt mastic stone mixture(stone mastic asphalt,SMA)with modified corn straw fiber quality fractions of 0,0.2%,0.4%,0.6%,and 0.8%are prepared.Rutting tests and low-temperature beam bending tests(-5,-10,-15℃)are conducted,and variance analysis(with a variance statistic of 66.47 and a probability of less than 0.000 1)and effect size analysis are performed.Combined with the standard deviations of low-temperature tensile strength,bending stiffness modulus,and tensile strain,as well as the quality fraction of modified corn straw fibers,a fiber dispersion uniformity index is proposed.The results show that when the quality fraction of modified corn straw fibers in the asphalt mixture is 0.4%,the dynamic stability is maximized at 4 268 times/mm,which is an increase of 50.4%compared to the control group without modified corn straw fibers.The low-temperature tensile strength and tensile strain are significantly improved,while the reduction in bending stiffness modulus is minimal,indicating an optimal balance between tensile strength,stiffness,and ductility.The dispersion uniformity index is maximized at 1.042,reflecting the best fiber dispersion,consistent with the results of high and low temperature tests.
Keywords：modified corn straw fiberasphalt mixturehigh and low temperature performancesingle factor analysiseffect size analysisfiber dispersion uniformity index
Publication Date：2025-07-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 59-67 )