高模量沥青混凝土抗变形性能研究

对高模量沥青混凝土及SBS改性沥青和70#普通沥青混凝土在15℃、20℃、40℃及60℃条件下进行单轴贯入和抗压回弹模量试验,结果表明高模量沥青混凝土在各温度下具有相对较高的抗剪强度和抗压回弹模量值,尤其在高温时优势明显.分别得到了以标准温度15℃及20℃抗压回弹模量为基准的回归方程,可以对各种混合料在不同温度下抗压回弹模量进行较高精度的推算,当对结果精度要求不高时也可以采用抗剪强度对抗压回弹模量进行换算.通过对路面结构永久变形的计算,验证了国外将高模量沥青混凝土用于路面结构中间层的正确性,同时也表明了采用抗剪强度及抗压回弹模量指标进行路面变形分析的合理性.

Research on Anti deformation Properties of High Modulus Asphalt Concrete

Based on the uniaxial penetration and compressive resilient modulus test,the high modulus asphalt concrete,SBS modified asphalt and 70# plain asphalt concrete under the condition of 15℃,20℃,40℃ and 60℃ have been evaluated.The test results show that the high modulus asphalt concrete has relatively high shearing strength and modulus under various temperatures and especially at high temperatures.The equation based on compressive resilient modulus at standard temperature 15℃ and 20℃ is obtained through regression analysis to calculate the compressive resilient modulus at different temperatures for kinds of mixtures.Also shearing strength can be used to calculate the modulus when the precision demand is not so high.Through calculating the permanent deformation of the pavement structures,it proves high modulus asphalt concrete being used as the middle layer of pavement structures in foreign countries is rational.Experimental results verifies the reasonability of shearing strength with compressive resilient modulus being used to analysis the anti-deformation properties of asphalt concrete.