Freeze–Thaw Damage Mechanism Analysis of SBS Asphalt Mixture Containing Basalt Fiber and Lignocellulosic Fiber Based on Microscopic Void Characteristics

Freeze–thaw effects pose the significant challenge to asphalt pavement durability, leading various types of distress and deterioration. This study investigates freeze–thaw damage mechanism Styrene–Butadiene–Styrene (SBS) mixtures containing reinforcement fibers, specifically basalt fiber as well lignocellulosic fiber, through a microscopic void characteristics analysis. investigation aims understand how presence influences for SBS during cycles. A comprehensive experimental program was conducted mechanical characteristics, which involved preparation fiber. The performances two decrease with more decline is faster initially gradually slows down. Basalt-fiber-modified SMA-13 has higher air content properties compared lignocellulosic-fiber-modified SMA-13, indicating that adding fibers improves mixture. Both experience increasing cycles, irreversible damage. stability levels are similar, but basalt-fiber-modified lower splitting strength stiffness modulus SMA-13. suggests enhances resistance Surface wear under repeated cycles complex dynamic process. Fractal theory can uncover surface wear, while describing behavior deformation using fractal dimension, angularity, roundness, aspect ratio logical effective approach. findings provide insights into mechanisms at level, highlighting fibers. They valuable be used optimize design maintenance pavements.