基于工业CT乳化沥青冷再生混合料细微观结构性能研究

发布时间：2018-04-02 12:04

本文选题：路面工程　切入点：乳化沥青冷再生混合料　出处：《公路工程》2017年02期

【摘要】：以国内现行的马歇尔击实、静压、振动、轮碾、旋转压实五种成型方式为载体,基于工业CT的无损检测技术和VG软件的三维重构功能对不同成型方式冷再生混合料内部的空级配、空隙等效直径、最可几孔径、空隙形状特征、粗颗粒的颗粒取向以及集料的破损状况等开展了系统研究,并分析给出最可几孔径、集料颗粒取向的数学模型表征以及建立了不同成型方式再生混合料细微观分布特征与力学性能之间的回归关系。研究结果表明:不同成型方式冷再生混合料空级配、最可几孔径之间的差异较为明显,乳化沥青冷再生混合料空隙体积与表面积符合lg V=K*lg S+B双对数线性拟合,将乳化沥青冷再生混合料细微观空隙结构等效为球体只是一种理想状态;不同成型方式乳化沥青冷再生混合料粗集料取向角基本符合洛伦兹分布,成型方式对再生混合料颗粒取向有显著影响,旋转压实、振动两种成型方式与路面芯样粗集料颗粒取向角最接近,而轮碾成型与实际路面碾压条件相差最大。
[Abstract]:With the current Marshall compaction, static pressure, vibration, wheel mill, rotary compaction as the carrier, Based on the nondestructive testing technology of industrial CT and the 3D reconstruction function of VG software, the air gradation, the equivalent diameter of the void, the most possible aperture and the characteristics of the shape of the void in the cold regenerated mixture with different molding methods are obtained. The grain orientation of coarse particles and the damage condition of aggregates have been studied systematically, and the most probable pore size has been obtained. The mathematical model of aggregate particle orientation and the regression relationship between fine distribution characteristics and mechanical properties of recycled mixture with different molding methods were established. The difference between the most probable pore sizes is obvious. The void volume and surface area of emulsified asphalt cold recycled mixture are in accordance with LG V=K*lg S B double logarithmic linear fitting. It is only an ideal state that the fine void structure of emulsified asphalt cold recycled mixture is equivalent to that of sphere, and the orientation angle of coarse aggregate of emulsified asphalt cold recycled mixture is basically in accordance with Lorentz distribution. The particle orientation of recycled mixture is significantly affected by the molding method. The rotary compaction and vibration are most close to the orientation angle of coarse aggregate, but the difference between wheel rolling and actual pavement rolling is the biggest.
【作者单位】：鄂尔多斯市公路管理局;
【分类号】：U414

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