复掺钢丝绒纤维/水镁石纤维沥青胶浆性能研究

通过改变纤维总掺量和两种纤维的体积比,采用廷度试验、锥入度试验、布氏旋转粘度试验和动态剪切流变试验研究了混杂纤维沥青胶浆的低温延展性能、抗剪切性能、粘度特性及高温流变特性,同时借助扫描电镜(SEM)对其试样断面进行观察分析.结果表明:沥青胶浆的低温延展性随纤维掺量的增大而降低;在6％纤维总掺量范围内,随着纤维掺量的增大粘度逐渐增大,且增大的幅度减小;当钢丝绒纤维与水镁石纤维体积比为6/4时,沥青胶浆的车辙因子(G*/sinδ)、抗剪强度达烈最佳值;将两种纤维混杂掺入沥青胶浆中,充分分散,其与沥青粘结良好,发挥了增粘和桥接作用,提高了沥青胶浆的整体稳定性和抵抗永久变形的能力.

Experimental Investigation on Properties of Steel Wool Fiber/Brucite Fiber Reinforced Asphalt Mortar

In order to investigate how fibers affect asphalt binder in low-temperature ductility,shear resistance,apparent viscosity and high-temperature rheology,ductility test,cone penetration test,Brookfield viscosity test and dynamic shear rheology test were applied and total adding mass and volume ratio of two type of fibers were considered.And cross sections morphology of samples were observed by scanning electronic microscope.Results showed that increasing addition of fibers could reduced low-temperature ductility.Viscosity was improved by increasing fiber addition but improvement seemed slower when adding proportion was close to 6％;while shear resistance and rut factor (G*/sinδ) performed better when volume ratio of steel wool and brucite fiber was 6/4.Therefore,rutting resistance can be improved by viscosity growth and bridging induced by well dispersion and interaction between binder and fibers.