聚丙烯纤维增强沥青胶浆的流变性能试验研究

研究了不同掺量(0～2.5%)聚丙烯纤维(PP纤维)对沥青胶浆针入度、软化点及动态剪切模量等流变性能影响的规律,并采用扫描电镜(SEM)对其微观增强机理进行了分析.试验结果表明:随着PP纤维掺量的增加,沥青胶浆的锥入度逐渐降低,软化点逐渐提高.PP纤维的加入,改善了沥青胶浆的热敏性和高温下抗永久变形的能力.通过微观结构分析,可知由于分散在沥青胶浆中的PP纤维起到了桥连的作用,使其应力分散,从而提高了沥青胶浆的稳定性.

Experimental Research on Rheological Properties of Polypropylene Asphalt Binder

Polypropylene fibers (PP fibers) were added to asphalt binders in this work, with concentrations varying from 0 to 2.5% in increments of 0.5% by weight of asphalt. The penetration, softening point, and dynamic shear rheometer (DSR) tests were conducted to study the rheological properties. The results indicate that with the increase in the dosage of PP fibers, the penetration values were decreased while the softening points increased. The PP fiber can reduce thermal sensitivity and increased resistance to permanent deformation at high temperatures. Although the microstructure analysis of fibers dispersion in asphalt, it can be seen that the bridge effect of PP fibers can disperse stress and improve the stability of asphalt binder.