Research on the Preparation Process and Modification Method of Cotton Straw Fiber Based on Road Performance

For better application of modified cotton straw fibers in asphalt pavements, Preparation of cotton straw fibers using the “mechanical-shear” method, Modification of cotton straw fibers by preparation of NaOH solutions of different mass fractions, Comprehensive evaluation of the modification effect of cotton straw fibers by oil absorption and heat resistance, Optimal modification process for cotton straw fibers; he roadworthiness of the modified cotton straw fiber was then analysesd by means of pH, oil absorption, heat resistance, ash content and absorbency tests. The results show that the best modification process for cotton straw fibers is infiltration in NaOH with a mass fraction of 5% for 30min; Modified cotton straw fibers are weakly alkaline, and have increased adhesion to bitumen, 20.7% increase in oil absorption compared to unmodified cotton straw fiber, Improved heat resistance, Slight reduction in tensile strength, 4% increase in absorbency compared to unmodified cotton straw fiber, better compatibility with asphalt.