考虑木质颗粒纤维分散率的SMA性能研究

Research on the Performance of Stone Mastic Asphalt Considering Dispersion of Granular Cellulose Fiber

通过不同木质颗粒纤维分散率下的马歇尔、谢伦堡析漏、冻融劈裂、车辙、低温弯曲、动态模量及抗滑试验,分析了木质颗粒纤维分散率下降对SMA沥青混合料性能的影响过程与机理。试验结果表明：随着木质颗粒纤维分散率的降低,SMA沥青混合料的密实度大幅增加;析漏损失呈指数增长;冻融前后劈裂强度均快速衰减,而冻融劈裂强度比基本不变;70℃动稳定度与-10℃弯拉破坏应变能密度均显著下降;混合料的温度敏感性变差,相位角逐渐增大,动态模量在低温高频时较为接近,而在高温低频时呈显著下降趋势;路表构造深度快速衰减,摆值略有下降。据此研究结果得出,木质颗粒纤维分散率是影响SMA沥青混合料性能的关键因素之一,保证木质颗粒纤维分散率有助于提高路面工程质量。

In order to study the influence of granular cellulose fiber dispersion rate on properties of stone mastic asphalt,various tests including Marshall,Schulenburg binder drainage,freeze-thaw splitting,rutting,bending beam strength,dynamic modulus and anti-skidding are carried out under different granular cellulose fiber dispersion.The results show that with the decrease of granular cellulose fiber dispersion,volumetric properties rapid firm up,and drainage loss exponential grows.Before and after freeze-thaw splitting strength decline rapidly,while the residual strength ratio varies little.Both dynamic stability and curvature strain energy density significantly decrease.Moreover,mixture thermosensitivity enhances and phase angle increases,dynamic modulus have similar values at high frequency and low temperature while decreases drastically at low frequency and high temperature.Texture depth declines significantly,but British pendulum number decreases slightly.Based on the results from this study,granular cellulose fiber dispersion rate is a key influence factor of stone mastic asphalt performance,and guarantee the dispersion rate of granular cellulose fiber can improves pavement quality.