泡沫沥青冷再生混合料成型方法

发布时间：2018-02-01 12:08

本文关键词： 振动成型不同压实方法力学强度空隙分布状态空隙特性　出处：《复合材料学报》2017年09期 　论文类型：期刊论文

【摘要】：采用振动成型设备以压实度为指标确定了泡沫沥青冷再生混合料振动成型的振动时间。振动成型、静压成型、马歇尔成型及旋转压实成型试件在总空隙率相同的条件下,对比了不同成型方法混合料的力学强度,分析了强度差异产生的原因。基于CT检测手段,分析了不同成型方法混合料内部空隙分布状态、空隙分形维数、最可几孔径及平均孔径。结果表明:旋转压实的"揉搓作用"显著增大了冷再生混合料的间接拉伸强度,振动成型次之,静压成型与马歇尔成型混合料间接拉伸强度(ITS)较接近,而四种成型方法混合料的无侧限抗压强度差别不大;旋转压实及振动成型会影响泡沫沥青冷再生混合料内部细颗粒的分布,进而影响混合料内部空隙的分布状态,这两种成型方式混合料内部空隙数目多且等效半径小。不同压实方法的压实机理的差异导致混合料内部空隙平均孔径、空隙维数及最可几孔径存在差异。空隙特征的不同是引起冷再生混合料力学强度差异的本质原因。
[Abstract]:The vibration compaction molding equipment to determine the index of vibration time of cold recycled asphalt mixture vibration molding molding. Vibration molding, static pressure, Marshall forming and rotating compaction molding conditions in the same rate of total porosity, mechanical strength comparison of different molding methods of mixture, analyzed the reason of differences in strength CT detection method based on analysis of different molding methods of internal void distribution mixture state space, fractal dimension, maximum pore size and average pore size. The results show that the rotary compaction "rubbing" significantly increases the cold recycled mixture indirect tensile strength, vibration time, static pressure molding and forming mixed Marshall material indirect tensile strength (ITS) is close to four, and the forming method of unconfined compressive strength difference mixture; rotating compaction and vibration molding will affect the global cold regeneration of foam asphalt The distribution of mixture of fine particles, thereby affecting the distribution of mixture of internal voids, the number of two kinds of molding mixture and the equivalent radius of small voids. Differential compaction mechanism of different compaction methods due to the average pore size of internal voids mixture, the gap dimension and the pore space of different characteristics are different. The essential reason is caused by the difference of mechanical strength of cold recycled mixture.

【作者单位】：长安大学公路学院;长安大学道路结构与材料交通行业重点实验室;
【基金】：国家自然科学基金(51278060;51408050)
【分类号】：U414
【正文快照】： 网络出版地址:www.cnki.net/kcms/detail/11.1801.TB.20161208.0905.002.html引用格式:李志刚,郝培文,曾志武.泡沫沥青冷再生混合料成型方法[J].复合材料学报,2017,34(9):2038-2046.LI Zhigang,HAO Peiwen,ZENG Zhiwu.Research on the compaction methods of cold recycled mi

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