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为了确定沥青混合料中的最佳沥青用量,利用CT技术识别沥青混合料各组分内部结构特征,并以粗集料、沥青砂浆和空隙各组分的密度和面积为主要特征参数,提出了沥青混合料的均匀性评价指标,建立了沥青混合料均匀性评价方法;分析了沥青混合料马歇尔设计方法中的体积设计参数与内部结构各组分特征的关系,考虑了沥青混合料内部结构的均匀性,建立了沥青混合料最佳沥青用量的确定方法,并选用3种沥青混合料(AC-13、AC-16和AC-20)对该方法的有效性进行了验证。分析结果表明:沥青混合料的均匀性评价指标与空隙率具有良好的对应关系,最小均匀性评价指标对应沥青混合料试件内部结构均匀性最佳时的空隙率;基于均匀性评价方法所得的空隙率与密度试验测算空隙率的平均差值为0.28%,并据此计算的间隙率和饱和度与采用马歇尔设计方法得到的间隙率和饱和度的平均值差值分别为0.27%和1.33%,因此,利用考虑均匀性的沥青混合料内部结构各组分体积特征参数可以准确地表征沥青混合料马歇尔设计方法中的体积设计参数;采用最佳沥青用量确定方法与马歇尔设计方法得到的AC-13、AC-16和AC-20三种沥青混合料最佳沥青用量差值分别为0.07%、0.03%和0.05%,这表明了最佳沥青用量确定方法的有效性。
In order to determine the best asphalt content in asphalt mixture, the internal structure of each component of asphalt mixture was identified by CT technology. The density and area of each component of coarse aggregate, asphalt mortar and void were taken as main characteristic parameters Asphalt homogeneity evaluation index to establish the method of evaluating the uniformity of asphalt mixture. The relationship between the volume design parameters of the asphalt mixture Marshall design method and the characteristics of each component of the internal structure was analyzed. The internal structure of the asphalt mixture And the best method to determine the asphalt content of asphalt mixture was established. The effectiveness of this method was verified by using three asphalt mixtures (AC-13, AC-16 and AC-20). The results show that the evaluation index of uniformity of asphalt mixture has a good correspondence with the porosity, and the minimum uniformity evaluation index corresponds to the porosity of asphalt mixture when the internal structure uniformity is the best. Based on the method of uniform evaluation, The average difference between the porosity and density was 0.28%. The difference between the calculated porosity and saturation and the average value of the porosity and saturation obtained by the Marshall design method were 0.27% and 1.33% Therefore, the volumetric design parameters of asphalt mixture Marshall design method can be accurately characterized by using the volumetric characteristic parameters of each component of the internal structure of the asphalt mixture considering the uniformity. By using the best asphalt dosage determination method and the Marshall design method, 13, AC-16 and AC-20 asphalt mixture best asphalt dosage difference of 0.07%, 0.03% and 0.05%, indicating the best asphalt dosage determination method is effective.