湿热地区路用改性沥青性能与技术指标研究

发布时间：2018-04-22 16:57

  本文选题：湿热地区 + 改性沥青　； 参考：《福州大学》2014年硕士论文

【摘要】：湿热地区沥青路面受到高温、重载、降雨等诸多不利外部条件的挑战,高性能改性沥青的使用是保障路面性能的重要措施。如何做到因地制宜的选择改性沥青,准确把握控制各类改性沥青的技术指标,是改性沥青应用的关键。鉴于以上,本文选择多种典型代表高粘沥青、胶粉改性沥青、新型掺合类改性沥青,开展了各类改性沥青技术特性、技术指标值域分布的室内试验研究,进而结合湿热地区路面工程的技术特点,深入揭示各类改性沥青的关键技术特性、提出关键控制技术指标和标准,研究具体成果与结论如下：开展了11种(5种成品、6种自制)高粘改性沥青性能普查,结果表明高粘改性沥青指标总体较基质沥青有显著提高,但易出现针入度偏小和60℃动力粘度指标性能不稳定的情况。温度扫描显示,成品高粘改性沥青主要改善了沥青在较高温(约60℃以上)的抗车辙能力,而在60℃以下的抗车辙能力较低,甚至不及基质沥青；频率扫描发现,高粘改性沥青总体具有更好的抗车辙能力,频率越高抗车辙能力越强。常规指标(软化点、当量软化点、60℃动力粘度、135℃粘度、170℃粘度)与车辙因子的相关性研究表明,60℃动力粘度与车辙因子具有较好的相关性。试验研究表明,胶粉对于改善沥青高低温性能、抗老化性能、弹性恢复性能和抗车辙能力等方面均有利,不同沥青性能对应的改性最优目数并不相同。胶粉复合改性最主要提高了沥青的5℃延度、25℃粘韧性和韧性以及60℃动力粘度值,硫磺对于胶粉、SBS复合改性沥青的抗车辙不和。研究发现,掺加硅藻土或湖沥青,总体改善沥青的高温性能和抗老化性能。但硅藻土对于不同频率下车辙因子有降低作用,掺加湖沥青对于延度不利；直接撒布硅藻土对粘层的抗剪切和抗拉拔性能极为不利。以上研究表明,单一指标往往无法反映改性沥青的总体性能,总体扫描检验往往十分必要。沥青改性对于各个指标的改变效果往往并不均衡,甚至反向,需要结合具体需求,选择具体的改性方法和材料。基于以上相关试验结果和分析,综合国内外已有研究,最后推荐了湿热地区改性沥青的技术指标和标准。
[Abstract]:Asphalt pavement in humid and hot area is challenged by many unfavorable external conditions, such as high temperature, heavy load, rainfall and so on. The use of high performance modified asphalt is an important measure to ensure pavement performance. How to select modified asphalt according to local conditions and accurately grasp the technical index of various modified asphalt is the key to the application of modified asphalt. In view of the above, this paper selected a variety of typical high viscosity asphalt, rubber powder modified asphalt, new mixed modified asphalt, the technical characteristics of all kinds of modified asphalt, technical index range distribution of laboratory test research, Combined with the technical characteristics of pavement engineering in humid and hot areas, the key technical characteristics of all kinds of modified asphalt are revealed in depth, and the key control technical indexes and standards are put forward. The research results and conclusions are as follows: 11 kinds of high viscosity modified asphalt with 5 kinds of finished products and 6 kinds of self-made ones are investigated. The results show that the index of high viscosity modified asphalt is significantly higher than that of base asphalt. However, the penetration is small and the dynamic viscosity index at 60 鈩，

本文编号：1788103