纤维掺加工艺对冷再生混合料性能的影响  

Effect of Fiber Addition Process on Properties of Cold Recycled Mixture

作　　者：王明 刁万民 孙斌 WANGMing;DIAO Wan-min;SUN Bin(Civil Aviation University of China,Tianjin 300300,China;Heilongjiang Highway Construction Center,Harbin 150001,China;Beijing Shengguangtuo Regeneration Technology Co.Ltd.,Beijing 100025,China)

机构地区：[1]中国民航大学,天津市300300 [2]黑龙江省公路建设中心,哈尔滨市150001 [3]北京盛广拓再生科技股份有限公司,北京市100025

出　　处：《公路》2022年第6期29-33,共5页Highway

基　　金：黑龙江省交通运输厅科技项目;中国民航大学机场工程科研基地开放基金项目,项目编号JCGC2018KFJJ04。

摘　　要：通过变换纤维的掺加顺序,设定了4种工艺,研究纤维掺加工艺对冷再生混合料低温、高温和水稳性能的影响;通过扫描电子显微技术,观测了不同工艺纤维混合料试样的微观结构,揭示了其微观机理。结果表明:工艺3的综合路用性能指标最优。与工艺1相比,其低温断裂能指标提升60%,劈裂强度提升11%,水稳性能提升18.9%。原因在于,工艺2拌和环境中湿度较小,纤维分散阻力较大;工艺4中,拌和环境中湿度过大,纤维容易出现结团现象,更加难以分散;工艺3中可获得最佳的湿度条件,纤维的分散效果最佳。微观分析发现,工艺2、4中存在纤维聚团或扎堆现象,而工艺3中在沥青与集料的界面处可观察到相互搭接的桥接式结构,在纤维混合料受力时传递和分散应力效果较好,可弥补RAP中界面黏附力不足的弱点。By changing the adding order of fiber, four processes are set to study the effect of fiber adding process on the low temperature, high temperature and water stability of cold recycled mixture. The micro-structure of fiber mixtures with different processes is observed by scanning electron microscopy, and its micro mechanism is revealed. The results show that the comprehensive road performance index of process 3 is the best. Compared with the mixture without fiber, its low-temperature fracture energy index, splitting strength and water stability are increased by 60%, 11% and 18.9% respectively. The reason is that the humidity in the mixing environment of process 2 is small and the fiber dispersion resistance is large. In process 4, if the humidity in the mixing environment is too high, the fiber is prone to agglomeration, which is more difficult to disperse. The best humidity conditions can be obtained in process 3, and the fiber dispersion effect is the best. Microscopic analysis shows that there is “agglomeration” or “pile up” of fibers in processes 2 and 4, while in process 3, overlapping bridging reinforced network structure can be observed at the interface between asphalt and aggregate. When the fiber mixture is stressed, the effect of transmitting and dispersing stress is good, which can make up for the weakness of insufficient interface adhesion in RAP.

关 键 词：道路工程 玄武岩纤维 掺加工艺 再生混合料 路用性能 

分 类 号：U416.26[交通运输工程—道路与铁道工程]