天然改性沥青及其混合料应用性能研究

发布时间：2018-05-07 19:56

本文选题：天然沥青 + 天然改性沥青　；参考：《河北工业大学》2014年硕士论文

【摘要】：本文从天然沥青的成因及国内外研究背景入手，详细的介绍了两种国内外应用较多的两种天然沥青：特立尼达湖沥青和印尼的布敦岩沥青，并选定这两种天然沥青作为本次研究的对象，采用比较分析的方法，，进而从天然沥青与基质沥青配伍性、天然改性沥青混合料配合比优化设计及其路用性能等多方面展开了较为全面的试验研究，并结合河南内邓高速公路项目，对湖沥青改性沥青的实际应用进行验证。 1.在对沥青配伍性分析方面，采用针入度体系和PG分级体系对不同掺配方式与比例的天然改性沥青进行了较为深入的研究，结果表明，掺加天然沥青后可明显提高沥青的抗高温性能和抗老化性能，针入度、软化点、粘度都有大幅度的提高，沥青PG分级的高温等级至少提高一个等级。 2.掺加天然沥青后，虽然高温性能显著提高，但其低温性能受到一定程度影响，故在使用天然改性沥青时，应特别关注使用地区的环境温度和掺配比例，不是掺量越大，路用效果就越好，并确定天然沥青掺配比例不宜大于25%。 3.通过采用GTM旋转剪切法，进行AC-20型不同掺配方式与比例的天然改性沥青混合料配合比设计，结果发现天然改性沥青混合料具有更好的抗剪切和抗变形能力，且高温稳定性能更出色，并具有更强的施工和易性和优良的压实特性。 4.普通沥青混合料、SBS改性沥青混合料和不同掺配方式与比例的天然改性沥青混合料的动稳定度、残留稳定度、冻融劈裂强度和低温弯曲试验结果，均满足规范指标要求； 5.通过河南省内邓高速公路项目，对内掺25%湖沥青改性沥青混合料进行实体工程的验证，配合比组成设计与施工现场质量指标均以接近或超过SBS改性沥青标准，且湖沥青改性沥青混合料的性能要求及施工效果表现良好。并提出了天然改性沥青混合料的施工工艺和方法。
[Abstract]:Starting with the origin of natural asphalt and the research background at home and abroad, this paper introduces in detail two kinds of natural asphalt which are widely used at home and abroad: Trinidad Lake Asphalt and Budun Rock Asphalt in Indonesia. The two kinds of natural asphalt were selected as the object of this study, and the compatibility of natural asphalt and base asphalt was analyzed by the method of comparative analysis. The optimization design of mixture ratio of natural modified asphalt mixture and its road performance were studied comprehensively. The practical application of Hu asphalt modified asphalt was verified by combining with the project of Henan Inner Deng Expressway. 1. In the aspect of compatibility analysis of asphalt, the penetration system and PG grading system were used to study the natural modified asphalt with different blending ways and proportions. After adding natural asphalt, the high temperature resistance and aging resistance of asphalt can be obviously improved. The penetration, softening point and viscosity of asphalt can be greatly improved, and the high temperature grade of asphalt PG classification can be improved by at least one grade. 2. Although the high temperature performance of natural asphalt is obviously improved, its low temperature performance is affected to a certain extent. Therefore, when using natural modified asphalt, special attention should be paid to the environmental temperature and blending ratio in the area of use. The better the road effect, and determine the proportion of natural asphalt blending should not be greater than 25. 3. By using GTM rotation shear method, the mix ratio design of natural modified asphalt mixture with different mixing ways and ratios of AC-20 type is carried out. The results show that the natural modified asphalt mixture has better shear and deformation resistance ability. And the high-temperature stability performance is better, and has the stronger construction and the ease and the fine compaction characteristic. 4. The dynamic stability, residual stability, freezing and thawing splitting strength and low temperature bending test results of SBS modified asphalt mixture and natural modified asphalt mixture with different blending methods and ratios meet the requirements of specifications. 5. Through the project of Nei-Deng Expressway in Henan Province, the concrete engineering verification of 25% bitumen modified asphalt mixture is carried out. The mix ratio design and construction site quality index are close to or exceed the SBS modified asphalt standard. And the performance requirements and construction effect of Hu asphalt modified asphalt mixture are good. The construction technology and method of natural modified asphalt mixture are put forward.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【共引文献】