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为了更精细地分析旧料对沥青混合料性能的影响,将旧料采用4.75 mm的筛网热筛分为粗、细两个部分,通过掺加不同比例的粗、细旧料组成6种级配的沥青混合料进行间接拉伸模量试验和劈裂强度试验,采用不同荷载频率的间接拉伸劲度模量、冻融前后的劈裂强度、破坏应变、黏韧性指数等指标评价了旧料对沥青混合料力学特性的影响。研究表明:低频率下的劲度模量、黏韧性指标、冻融前后的劈裂强度比可以作为掺加旧料沥青混合料力学特性的评价指标;旧料中与沥青混合料力学特性存在相关性的主要是旧沥青含量,旧沥青含量越高,沥青混合料拉伸劲度模量越大,黏韧性指数越小,冻融前后的劈裂强度比越小,力学特性越差。
In order to analyze the influence of the old material on the performance of the asphalt mixture, the old material was sieved by the 4.75 mm sieve into coarse and fine two parts. The coarse and fine materials with different proportions were used to make 6 grades Asphalt mixture with indirect tensile modulus test and splitting strength test, the use of different load frequency indirect tensile stiffness modulus, the splitting strength before and after freeze-thaw, failure strain, viscosity and toughness index and other indicators of the evaluation of the old Influence of material on mechanical properties of asphalt mixture. The results show that the stiffness modulus, the viscosity index, the splitting strength ratio before and after freezing and thawing can be used as the evaluation indexes for the mechanical properties of the asphalt mixture mixed with the old asphalt mixture at low frequency. The correlation between the mechanical properties of the asphalt mixture and the asphalt mixture Mainly the old asphalt content, the higher the content of the old asphalt, asphalt mixture tensile stiffness modulus, the smaller the viscosity and toughness index, the splitting strength ratio before and after freezing and thawing the smaller, the worse the mechanical properties.