集料润湿状态对树脂沥青混合料的路用性能影响分析与改善措施

发布时间：2018-10-25 17:38

【摘要】：随着我国经济实力的飞速增长，桥梁建设进入了蓬勃发展的时期。正交异性钢桥面板体系凭借其优势成为钢箱梁桥梁建设中常用的桥面板体系。然而，钢桥面板与铺装材料协同变形等问题，一直是亟需解决的难题，国内外很多学者对此做了大量研究。近几年来，自主研发的树脂沥青组合体系钢桥面铺装技术在国内多座大桥进行了铺装，取得了良好的效果。作为该铺装体系的整体化层，树脂沥青混合料的材料性能至关重要。本文结合理论分析与试验验证，基于表面能理论分析树脂沥青与非干燥集料的粘附性能，探究了集料含水率对树脂沥青混合料性能的影响，并提出树脂沥青混凝土水敏感性的改善措施。研究了树脂沥青的材料性能。由于树脂沥青为冷拌沥青材料，与普通热拌沥青的材料性能差异较大，评价指标也有所不同，通过试验探究了树脂沥青的粘度变化规律、施工和易性及断裂强度。基于表面能理论分析了树脂沥青与集料的粘附性能，，结果表明水与集料的粘附功大于树脂沥青与集料，当集料中存在水时，水比树脂沥青更易与集料粘附，在树脂沥青与集料之间形成水膜，进而影响混合料路用性能。试验结果也表明，与集料的粘附功树脂沥青远大于基质沥青、SBS改性沥青，体现出与集料优异的粘附性。研究了树脂沥青混合料的路用性能，包括允许工作时间、水稳定性、高温稳定性、低温性能等。设计模拟集料含水率的试验方法，并探究了集料含水率对混合料路用性能的影响。结果表明随着集料含水率的增加，混合料的各项路用性能不同程度地降低。通过试验选定生石灰为最佳外掺剂，并根据马歇尔试验探究外掺剂对混合料性能的改善作用。结果表明掺入生石灰后，与水反应生成氢氧化钙，提高混合料的抗剥落能力。不同含水率下存在最佳生石灰掺量，掺入量较少会降低除水效果；掺入过多会导致生石灰成团结块，遇水后体积膨胀胀裂混合料。通过理论与试验结合，推导出生石灰最佳掺量方程，并提出了树脂沥青混凝土水敏感性的改善措施，对结构层施工工艺进行研究。
[Abstract]:With the rapid growth of China's economic strength, bridge construction has entered a period of vigorous development. Orthotropic steel bridge panel system has become the bridge deck system in the construction of steel box girder bridge by virtue of its advantages. However, the cooperative deformation of steel bridge deck and pavement materials has always been a difficult problem to be solved, and many scholars at home and abroad have done a lot of research on it. In recent years, the steel deck paving technology of resin asphalt composite system has been applied to many bridges in China, and good results have been obtained. As the integral layer of the pavement system, the material performance of resin asphalt mixture is very important. Combined with theoretical analysis and experimental verification, based on the surface energy theory, the adhesion between resin asphalt and non-dry aggregate is analyzed, and the effect of aggregate moisture content on the performance of resin asphalt mixture is explored. The improvement measures of water sensitivity of resin asphalt concrete are put forward. The properties of resin pitch were studied. Because the resin asphalt is a cold mix asphalt material, the performance of the resin asphalt is different from that of the common hot mix asphalt, and the evaluation index is also different. Through the experiment, the change law of viscosity, the construction and the easiness and the breaking strength of the resin asphalt are studied. Based on the theory of surface energy, the adhesion between resin asphalt and aggregate is analyzed. The results show that the adhesion function of water and aggregate is greater than that of resin asphalt and aggregate. When there is water in aggregate, water adheres to aggregate more easily than resin asphalt. Water film is formed between resin asphalt and aggregate, which affects pavement performance of mixture. The experimental results also show that the adhesion resin asphalt with aggregate is much larger than the base asphalt and SBS modified asphalt, which shows excellent adhesion to aggregate. The pavement performance of resin asphalt mixture was studied, including allowable working time, water stability, high temperature stability, low temperature performance and so on. The test method of simulating aggregate moisture content is designed, and the influence of aggregate moisture content on pavement performance of mixture is explored. The results show that with the increase of aggregate moisture content, the pavement performance of the mixture decreases in varying degrees. The quicklime was selected as the best admixture, and the effect of the admixture on the performance of mixture was studied according to Marshall test. The results show that the mixture can react with water to form calcium hydroxide after adding quicklime to improve the anti-spalling ability of mixture. Under different moisture content, the optimum content of quicklime is the best, and the low content of quicklime will reduce the effect of water removal; too much admixture will lead to the agglomeration of quicklime, and the volume expansion dilatation and crack mixture after water treatment. Through the combination of theory and experiment, the equation of the optimum content of quicklime was deduced, and the improvement measures of water sensitivity of resin asphalt concrete were put forward, and the construction technology of structure layer was studied.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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