木质素与玄武岩纤维沥青胶浆路用性能试验

为对比分析木质素纤维与玄武岩纤维两种改性沥青胶浆的路用性能差异，采用三大指标、动态剪切流变及扫描电镜（SEM）分别对两种纤维沥青胶浆的高、低温性能及微观形貌进行了试验与分析。结果表明:玄武岩纤维的热稳定性更优，木质素纤维则具有更强的吸湿性及吸油性；两种纤维均可显著提升沥青的抗车辙性能与抗剪切性能，但低温延展性变差。扫描电镜试验结果表明:木质素纤维为呈针管状的中空结构，表面粗糙且能够吸附更多的沥青；玄武岩纤维外观形貌更加平整与光滑。两种纤维改性沥青机理主要为物理混合改性，纤维之间形成的网络结构以及纤维的脱黏与拔出效应，是沥青路用性能提升的主要原因。

Experimental Study on Road Performance of Wood and Basalt Fiber Asphalt Mortar

In order to compare and analyze the difference of road performance between wood fiber and basalt fiber modified asphalt mortar, the high and low temperature road performance and microstructure of the two kinds of fiber asphalt mortar were tested and analyzed by using three indexes, dynamic shear rheometer and scanning electron microscope (SEM). The results show that basalt fiber has better thermal stability, while wood fiber has stronger hygroscopicity and oil absorption. Both fibers can significantly improve the rutting resistance and shear resistance of asphalt, but the ductility decreases at low temperature. The results of scanning electron microscopy showed that the wood fiber was a hollow structure with rough surface and a needle tube in the center, which could absorb more asphalt. The appearance of basalt fiber is more flat and smooth. The mechanism of the two kinds of fiber modified asphalt is mainly physical mixing modification. The network structure formed between the fibers and the effect of fiber unsticking and pulling out are the main reasons for the improvement of asphalt road performance.