考虑均匀性的沥青混合料最佳沥青用量确定方法

发布时间：2018-11-26 11:49

【摘要】：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。
[Abstract]:In order to determine the optimum asphalt content in asphalt mixture, the internal structural characteristics of each component of asphalt mixture are identified by CT technology, and the density and area of coarse aggregate, asphalt mortar and voids are taken as the main characteristic parameters. The evaluation index of asphalt mixture uniformity is put forward, and the evaluation method of asphalt mixture uniformity is established. The relationship between the volume design parameters of asphalt mixture Marshall design method and the characteristics of each component of internal structure is analyzed. Considering the homogeneity of internal structure of asphalt mixture, the method of determining the optimum asphalt content of asphalt mixture is established. Three kinds of asphalt mixture (AC-13,AC-16 and AC-20) are selected to verify the effectiveness of the method. The results show that the homogeneity evaluation index of asphalt mixture has a good corresponding relationship with the void ratio, and the minimum uniformity evaluation index corresponds to the porosity of the asphalt mixture specimen when the internal structure uniformity is optimal. The average difference between the porosity and density test based on the uniformity evaluation method is 0.28. The difference between the calculated clearance rate and saturation is 0.27% and 1.33%, respectively, compared with the difference between the average value of the rate and saturation obtained by the Marshall design method. The volume design parameters in Marshall design method of asphalt mixture can be accurately represented by the volume characteristic parameters of each component of asphalt mixture internal structure considering homogeneity. The difference between the optimum asphalt content of AC-13,AC-16 and AC-20 is 0.07% and 0.05%, respectively, by using the optimum asphalt content determination method and the Marshall design method. This shows the effectiveness of the method for determining the optimum asphalt content.
【作者单位】：大连海事大学道路与桥梁工程研究所;密歇根理工大学土木与环境工程系;哈尔滨工业大学交通科学与工程学院;
【基金】：国家自然科学基金项目(51308084) 中央高校基本科研业务费专项资金项目(3132014223)
【分类号】：U414

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