泡沫沥青冷再生技术的应用研究

发布时间：2018-03-17 10:47

本文选题：泡沫沥青　切入点：发泡效果　出处：《同济大学》2008年硕士论文　论文类型：学位论文

【摘要】： 本文通过资料调研、室内试验、理论分析及工程经验总结,对泡沫沥青冷再生技术的沥青发泡特性和评价方法、混合料性质及关联因素、材料特征及级配要求、配合比设计过程及工程应用经验进行研究探讨,对该技术进行总结完善,并力求形成完整的理论体系,以指导今后的室内材料设计和工程应用过程。通过室内沥青发泡试验,研究沥青发泡特性及其影响因素,并探讨沥青发泡效果和泡沫沥青再生混合料性能之间的相关性。试验结果显示:沥青种类、发泡用水量和发泡用水温度显著影响发泡效果,而沥青温度对发泡效果的影响不大;在发泡用水量增加过程中,5%发泡用水量前后的发泡指标变化规律发生改变;沥青发泡效果和泡沫沥青再生混合料的性能相关性不显著。在上述结论的基础上,进而分析了“最佳发泡条件”的缺陷,认为应当以“合适发泡范围”代替“最佳发泡条件”,用以指导实际的工程应用。探讨了泡沫沥青再生混合料的材料特征、级配设计原则与粉料通过百分率标准。从颗粒外观状态入手,分析了铣刨料的分类标准和级配影响因素。在室内数据、强度形成机理和工程经验的基础上,提出了应当以铣刨料级配指导泡沫沥青冷再生的现场施工和级配设计。并针对粉料目标通过率普遍无法达标的我国工程现状,设计室内试验。最终发现3%的粉料通过率即可获得性能优良的泡沫沥青再生混合料,因此建议将0.3mm以下筛孔的目标通过百分率下限适当降低。本文还优化了泡沫沥青再生混合料的配合比设计过程。通过引入正交试验方法,对现有的单向简单的配合比设计过程进行调整,使得在配合比设计过程中,能够充分考虑泡沫沥青用量、拌和用水量、级配方案等主要设计内容的相互影响和各种组合,最终同时确定最佳拌和用水量、最佳级配方案、最佳沥青用量等关键设计指标。
[Abstract]:Based on data investigation, laboratory test, theoretical analysis and engineering experience, the foaming characteristics and evaluation methods, mixture properties and related factors, material characteristics and grading requirements of foamed asphalt cold recycling technology are studied in this paper. In order to guide the design and engineering application of indoor materials in the future, the proportion design process and engineering application experience are studied and discussed, the technology is summarized and perfected, and a complete theoretical system is formed to guide the interior material design and engineering application process in the future. Through the indoor asphalt foaming test, the foaming characteristics of asphalt and its influencing factors are studied, and the correlation between the asphalt foaming effect and the performance of foamed asphalt recycled mixture is discussed. The foaming effect was significantly affected by foaming water consumption and water temperature, but not by bitumen temperature, and the change of foaming index was changed during the process of increasing water consumption by 5%. The correlation between asphalt foaming effect and performance of foamed asphalt recycled mixture is not significant. On the basis of the above conclusion, the defects of "optimum foaming condition" are analyzed. It is suggested that "suitable foaming range" should be replaced by "optimum foaming condition" to guide practical engineering application. This paper discusses the material characteristics, grading design principles and percentage standard of foamed asphalt recycled mixture. Starting with the appearance state of particles, the classification criteria and gradation influencing factors of milling and planing materials are analyzed, and the indoor data are analyzed. On the basis of strength forming mechanism and engineering experience, it is proposed that milling gradation should be used to guide the field construction and grading design of cold regeneration of foamed asphalt. In the design room test, it is found that the fine foamed asphalt recycled mixture can be obtained with the passing rate of 3% powder. Therefore, it is suggested that the target of the sieve hole below 0.3 mm should be reduced properly through the lower limit of the percentage. This paper also optimizes the mix ratio design process of foamed asphalt recycled mixture. By introducing the orthogonal test method, the existing one-way simple mix ratio design process is adjusted, so that in the mix proportion design process, It can fully consider the interaction and combination of the main design contents, such as the amount of foamed asphalt, mixing water consumption, gradation scheme and so on. Finally, the key design indexes such as the best mixing water consumption, the best gradation scheme and the optimum asphalt content can be determined at the same time.
【学位授予单位】：同济大学
【学位级别】：硕士
【学位授予年份】：2008
【分类号】：U414

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