玄武岩纤维沥青胶浆优化设计及机理分析

Optimization Design and Mechanism Analysis of Basalt Fiber Reinforced Asphalt Mastics

摘要:

采用正交试验设计方法，探讨了玄武岩纤维长度、纤维掺量和沥青标号对玄武岩纤维吸附沥青能力、玄武岩纤维沥青胶浆低温性能及冻融抗剪性能的影响规律，并基于模糊理论对玄武岩纤维沥青胶浆组成进行了优选；同时借助扫描电镜（SEM）揭示了玄武岩纤维的作用机理.结果表明：玄武岩纤维长度和纤维掺量是影响纤维吸附沥青能力、纤维胶浆低温极限拉力和低温拉伸断裂能的主要因素，而沥青标号对纤维胶浆冻融抗剪强度的影响最为显著；选用90#沥青和9mm玄武岩纤维，且纤维掺量（质量分数）为7%时，纤维胶浆模糊决策综合性能最优；玄武岩纤维与沥青浸润较好，纤维形成的网状结构可增强纤维胶浆的抗裂性，并能延缓内部微裂缝的扩展.

Abstract:

Orthogonal experiment was carried out to explore the influence of fiber length, fiber content and asphalt grade on adsorption capacity of basalt fiber, low temperature performance and freeze thaw shear performance of basalt fiber reinforced asphalt mastics, and optimal combination of basalt fiber reinforced asphalt mastics was recommend based on fuzzy analysis. And the strengthening mechanism of basalt fiber was revealed based on scanning electron microscope（SEM）. The results show that basalt fiber length and fiber content are the most significant factors which influence the adsorption capacity of basalt fiber, ultimate tension and tensile crack energy in low temperature. The grade of asphalt is the main factor which influences freeze thaw shear strength. The optimal combination of basalt fiber reinforced asphalt mastics in the heavy frozen area is 90# asphalt, 9mm basalt fiber and 7% fiber content. The infiltration between basalt fiber and asphalt is preferable, and net lapping structure formed by basalt fiber enhances the crack resistance and delays the expansion of micro cracks of basalt fiber reinforced asphalt mastics.