基于CT技术的沥青混合料均匀性评价方法

发布时间：2019-03-18 18:43

【摘要】：为了有效地评价沥青混合料的均匀性,基于CT技术识别混合料试件内部结构,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,建立沥青混合料均匀性评价方法,其中给出了单层截面和单一试件的均匀性评价指标(K_d和K_z),选用3种级配类型,每种类型包含4组不同沥青用量制备沥青混合料试件,应用此方法评价了沥青混合料试件的均匀性,检验了沥青混合料试件制作差异,获得了沥青混合料最佳沥青用量,以及判定了沥青混合料内部结构均匀性薄弱位置。结果表明:均匀性评价方法可以评价单一或一组沥青混合料试件的内部结构均匀性;检验具有相同成型方法、相同配比的一组沥青混合料试件的制作差异,并且劈裂试验结果进一步证明了其在实际应用中的可靠性较好;利用均匀性评价指标K_z分析获得各种类型(AC,SMA和OGFC)沥青混合料内部结构均匀性处于最佳状态所对应的沥青用量与马歇尔试验获得的最佳沥青用量差值分别为0.07%、0.1%和0.55%,这为通过马歇尔方法确定的沥青混合料最佳沥青用量提供了参考;基于沥青混合料试件所有分析单层截面K_d的最大值与均值的差值可以判定试件内部结构均匀性薄弱的位置。
[Abstract]:In order to evaluate the uniformity of asphalt mixture effectively, the internal structure of the mixture is identified based on CT technology, and the density and area of each component of coarse aggregate, asphalt mortar and void are taken as the main characteristic parameters. The uniformity evaluation method of asphalt mixture is established, in which the evaluation indexes of single-layer cross-section and single specimen are given, and three kinds of gradation types are selected. Each type consists of four groups of asphalt mixture specimens prepared by different asphalt content. The uniformity of asphalt mixture specimens is evaluated by this method, and the difference in making asphalt mixture samples is tested, and the optimum asphalt content of asphalt mixture is obtained. The weak position of internal structure uniformity of asphalt mixture is also determined. The results show that the uniformity evaluation method can be used to evaluate the internal structural uniformity of a single or a group of asphalt mixture specimens. A group of bituminous mixture specimens with the same molding method and the same proportion are tested, and the results of splitting test further prove its reliability in practical application is better. Various types (AC,) were obtained by using the uniformity evaluation index K _ (z) analysis. SMA and OGFC) the difference between the content of asphalt and Marshall test is 0.07%, 0.1% and 0.55%, respectively, when the internal structural uniformity of asphalt mixture is in the optimum state. This provides a reference for the best asphalt content of asphalt mixture determined by Marshall method. Based on the difference between the maximum value and the mean value of the single-layer cross-section K _ (d) of the asphalt mixture specimen, the weak position of the internal structural uniformity of the specimen can be determined.
【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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