硅藻土改性沥青及其质量控制技术研究

发布时间：2018-03-30 09:23

本文选题：硅藻土　切入点：改性剂　出处：《重庆交通大学》2014年硕士论文

【摘要】：为了解决沥青路面在使用过程中出现的质量问题，减少道路病害，提高道路的使用性能和寿命，向沥青中添加改性剂已成为一种重要的手段。硅藻土作为一种沥青改性剂，添加到沥青混合料当中，不仅改善了沥青路面的路用性能，而且与一般的聚合物改性剂相比，，生产价格低廉，可以降低改性沥青的成本，具有很广阔的应用前景。对于硅藻土沥青改性剂的开发与使用，国内外已有一些研究，但是对于硅藻土改性沥青混合料的质量控制与检测，未见明确试验方法。本文根据国内外硅藻土的相关研究资料了解、学习硅藻土的基本性质和特征；利用DSC、SEM微观分析的方法，探讨硅藻土的微观改性机理，SEM分析显示，一定掺量范围内的硅藻土能够与沥青形成均一、稳定的整体；对不同硅藻土掺量的改性沥青进行常规试验、SHRP试验。试验结果说明一定范围内掺量的硅藻土改性剂有利于沥青的抗变形能力与高温性能；并对不同硅藻土掺量的改性沥青混合料进行高温、低温、水稳定性能试验。试验结果证明加入适量的硅藻土能够有效改善、提升路面的使用性能，经过对试验结果的综合比较、分析，确定出硅藻土改性剂的适宜掺量为17%。同时，对硅藻土比表面积和二氧化硅含量这两个重要技术指标提出了相应的检测方法和质量标准。将溶液吸附法应用到硅藻土比表面积的检测中，提出了盐酸不溶物法检测硅藻土中二氧化硅的含量。并利用盐酸不溶物法建立抽提粉料溶解度与混合料中硅藻土含量的关系，检测硅藻土在改性沥青混合料中的掺量，从而控制硅藻土改性沥青混合料的质量。该检测方法的验证结果说明，盐酸不溶物法能够较为准确、快速的检测出硅藻土在混合料中的掺量，是一种可行、简便和有效的检测方法。对重庆市向家坡立交至黄桷垭试验路段的硅藻土改性沥青混合料进行配合比设计，并对硅藻土改性沥青路面施工工艺进行介绍，硅藻土改性沥青路面适应气候广泛，施工简便、几乎不需任何专用设备。总的来说，是一种优良的沥青改性剂，适宜大规模的推广应用。
[Abstract]:In order to solve the quality problems in the course of using asphalt pavement, reduce road diseases, improve the performance and service life of road, adding modifier to asphalt has become an important means. Diatomite is a kind of asphalt modifier. Adding it to the asphalt mixture not only improves the road performance of the asphalt pavement, but also reduces the cost of the modified asphalt because of its low production price compared with the common polymer modifier. There are some researches on the development and application of diatomite asphalt modifier at home and abroad, but there is no clear test method for the quality control and detection of diatomite modified asphalt mixture. In this paper, the basic properties and characteristics of diatomite are studied according to the relevant research data at home and abroad, and the microscopic modification mechanism of diatomite is discussed by means of DSC-SEM. Diatomite in a certain amount range can form a uniform and stable whole with asphalt. The SHRP test of modified asphalt with different diatomite content was carried out. The experimental results show that the modified diatomite modifier in a certain range is beneficial to the deformation resistance and high temperature performance of asphalt. The experimental results of high temperature, low temperature and water stability of the modified asphalt mixture with different diatomite content show that adding appropriate amount of diatomite can effectively improve the performance of the pavement, and through the comprehensive comparison of the test results, The suitable amount of diatomite modifier is determined to be 17. At the same time, the specific surface area of diatomite and the content of silicon dioxide are determined by the corresponding methods and quality standards. The solution adsorption method is applied to the detection of the specific surface area of diatomite. The method of hydrochloric acid insoluble matter is proposed to detect the content of silica in diatomite, and the relationship between the solubility of extracted powder and the content of diatomite in mixture is established by the method of hydrochloric acid insoluble matter to detect the content of diatomite in modified asphalt mixture. Therefore, the quality of diatomite modified asphalt mixture is controlled. The verification result of this method shows that the hydrochloric acid insoluble material method can detect the content of diatomite in the mixture quickly, which is feasible. A simple and effective method for detection. The mixture ratio design of diatomite modified asphalt mixture from Xiangjiapo overpass to Huangjuayya test section in Chongqing is carried out, and the construction technology of diatomite modified asphalt pavement is introduced. The diatomite modified asphalt pavement adapts to the climate extensively. In general, it is an excellent asphalt modifier and suitable for large-scale application.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】