基于单轴贯入试验的沥青混合料抗剪性能影响因素分析

为了确定沥青品种及用量、级配类型、公称最大粒径和孔隙率等因素对沥青混合料抗剪性能的影响,采用了单轴贯入试验分析。得出了各项因素对沥青混合料抗剪性能的影响规律。结果表明,采用改性沥青后混合料抗剪强度可提高22%~25%;2.36 mm筛孔通过率为35%,0.075 mm筛孔通过率为5.5%时混合料抗剪强度达到最大值;沥青混合料抗剪强度与公称最大粒径具有线性相关性,增大混合料粒径有助于提高其抗剪强度。

Analysis on Influencing Factors of Asphalt Mixture Shear Performance Based on Uniaxial Penetration Test

The uniaxial penetration tests were done to analyze shear strength of asphalt mixture under different conditions, in order to determine the influence on shear performance of asphalt mixture by varieties and amount of asphalt, aggregate, nominal maximum particle size and porosity, and other factors. The results show that, asphalt mixture shear strength can be increased by 22%~25% using the modified asphalt; mixture shear strength reached the maximum value when passing rate of 2.36mm is 35% and the passing rate of 0.075mm is 5.5%; there is a linear correlation between asphalt mixture shearing strength and nominal maximum size, increasing mixture particle size is helpful to improve the shear strength.