Study on the Freeze–Thaw Cycle Durability of Bamboo Fiber Asphalt Mixture: Fid-Bau Portal

Study on the Freeze–Thaw Cycle Durability of Bamboo Fiber Asphalt Mixture

Xia, Chaoming / Xu, Min / Li, Quan / Liu, Kefei / Jiang, Kang

At present, lignin fiber widely used in asphalt mixture is derived from logs, and its large-scale production will consume a lot of forest resources. Bamboo is a good substitute for lignin fiber because of its rapid growth characteristic and good physical and mechanical properties. To evaluate the freeze–thaw cycle durability of bamboo fiber asphalt mixture, using AC-13, AC-16, SMA-13 and SMA-16 gradation schemes, the freeze–thaw resistance of bamboo fiber asphalt mixture was studied by splitting test under different freeze–thaw cycles. Non-fiber asphalt mixture and lignin fiber asphalt mixture were used as control group. Based on the reliability and damage theory, the freeze–thaw damage evolution model was established, the freeze–thaw damage characteristics of bamboo asphalt mixtures were analyzed, and a method for estimating the freeze–thaw damage residual life of bamboo fiber asphalt mixture was proposed. The results show that bamboo fiber and lignin fiber have basically the same improvement effect on the freeze–thaw cycle durability of asphalt mixture. The freeze–thaw cycle durability of stone mastic asphalt (SMA) gradation mixture is better than that of asphalt concrete (AC) gradation mixture. The freeze–thaw damage evolution model can better reflect the freeze–thaw damage characteristics and damage evolution law of bamboo fiber asphalt mixture. The actual freeze–thaw time corresponding to the splitting strength damage degree of bamboo fiber asphalt mixture up to 25% can be taken as its anti-freeze–thaw life.