环氧沥青与热塑性沥青调配工艺及性能研究

发布时间：2018-02-24 01:19

本文关键词： 环氧沥青热塑性沥青 MEA 调配工艺性能评价显著性检验经济性　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：环氧沥青性能优越,相对于其他材料具有很强竞争力,但其技术的复杂性与昂贵的工程造价,使得环氧沥青在推广应用方面受到一定阻碍。鉴于此,本文提出将热塑性沥青与环氧沥青进行调配,兼顾环氧沥青优异路用性能与热塑性沥青廉价经济性能的优点,预期获得路用服役性能优良且经济可行的沥青混合料。本文以混合沥青(MEA)性能研究为目标,从调配工艺入手,考虑热塑性沥青掺配种类与比例不同,研究结合料与混合料性能变化规律,从而提出经济适用的MEA混合料类型。首先,在阐述环氧沥青与热塑性沥青组成与结构差异的基础上,优选原材料种类,确定调配工艺研究内容,以直接拉伸强度、断裂延伸率、软化点差作为控制指标,明晰掺配顺序、搅拌方式、拌合时间与拌合温度对MEA性能的影响,确定最佳调配工艺。其次,以热塑性沥青种类与掺量为控制变量,采用直接拉伸试验测试MEA结合料强度变形特性,结果表明当沥青体分比较高时,体系交联强度变弱；试验获取MEA结合料粘时曲线,建立基于Roller方程的粘度增长模型,确定基于粘时曲线的混合料容留时间；剪切粘附试验结果定量反映MEA结合料与石料间粘附性能优良。进而,从MEA混合料配合比设计入手,探寻混合料物理参数变化规律,结果表明最佳沥青用量随沥青掺量增加而减少,空隙率随之升高；通过系列试验探寻热塑性沥青种类与掺量对MEA混合料基本力学特性与稳定耐久性能的影响,结果表明热塑性沥青的掺入引起混合料强度与模量的衰减以及变形能力的改善,对水稳定性与高温稳定性影响较小。最后,通过单因素方差分析与双因素方差分析检验控制变量对混合料性能指标影响显著性,结果表明,相对于热塑性沥青种类,沥青掺配比例对MEA性能的影响更加显著；根据钢桥面环氧沥青混凝土铺装技术要求,本文建议70号与90号热塑性沥青的掺配上限分别为28%与27%,两种方案分别可节约24.2%与23.8%的经济成本。
[Abstract]:Epoxy asphalt has excellent performance and is very competitive compared with other materials, but its technical complexity and high engineering cost make it difficult to popularize and apply epoxy asphalt. In this paper, the advantages of blending thermoplastic asphalt and epoxy asphalt are put forward, which take into account the excellent road performance of epoxy asphalt and the cheap and economical performance of thermoplastic asphalt. It is expected to obtain the asphalt mixture with excellent service performance and economical and feasible performance. This paper aims at the study of the performance of mixed asphalt (MEA), starting with the blending process, considering the different types and proportions of the mixture of thermoplastic asphalt. This paper studies the performance change law of binder and mixture, and puts forward the economical and applicable MEA mixture type. Firstly, on the basis of expounding the difference of composition and structure between epoxy asphalt and thermoplastic asphalt, the raw materials are selected. Determine the research content of blending process, take direct tensile strength, elongation at break, softening point difference as the control index, make clear the mixing sequence, agitation mode, mixing time and mixing temperature on the performance of MEA, determine the best blending process. Taking the type and content of thermoplastic asphalt as control variables, the strength and deformation characteristics of MEA binder were tested by direct tensile test. The results show that the crosslinking strength of the system weakens when the bitumen content is high, and the adhesive time curve of MEA binder is obtained. The viscosity growth model based on Roller equation is established to determine the sheltering time of mixture based on the adhesion time curve, and the shear adhesion test results quantitatively reflect the excellent adhesion performance between MEA binder and stone. Then, starting with the mix ratio design of MEA mixture, The results show that the optimum asphalt content decreases with the increase of asphalt content, and the void ratio increases with the increase of asphalt content. Through a series of tests to find out the influence of the type and content of thermoplastic asphalt on the basic mechanical properties and stable durability of MEA mixture, the results show that the addition of thermoplastic asphalt causes the attenuation of strength and modulus and the improvement of deformation ability of the mixture. Finally, the influence of control variables on mixture performance is significant through single factor analysis of variance and double factor analysis of variance. The results show that, compared with the type of thermoplastic asphalt, the effect of the control variables on the performance of the mixture is less significant than that of the thermoplastic asphalt. The effect of asphalt blending ratio on the performance of MEA is more significant, according to the technical requirements of steel bridge deck epoxy asphalt concrete pavement, This paper suggests that the upper limit of blending of 70th and 90th thermoplastic bitumen is 28% and 270.The two schemes can save 24.2% and 23.8% economic cost respectively.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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