玄武岩纤维在低噪声沥青路面中的应用研究

发布时间：2018-01-26 02:16

本文关键词： 道路工程玄武岩纤维低噪声路面机理研究路用性能　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前，我国有关玄武岩改性沥青混合料的研究起步较晚，将其应用于开级配降噪沥青混合料中更是鲜有报道，其众多性能有待进一步的研究和验证。基于此，本文通过正交试验及驻波管试验，对比分析了不同影响因素对开级配沥青混合料降噪性能的影响规律，基于针入度试验、软化点试验、延度试验、弹性恢复试验以及表观粘度试验，揭示了玄武岩纤维与沥青的作用机理，同时系统研究了纤维掺量对开级配沥青混合料路用性能的影响规律，并提出了玄武岩纤维改性沥青混合料的施工工艺。 1、采用正交试验方法，，理论分析了四种参数对开级配沥青混合料降噪特性的影响，结果表明空隙率对沥青混合料降噪性能影响最为主要，且随着路面厚度的增加，降噪效果趋于稳定，在实际应用过程中开级配沥青混合料的面层结构厚度可控制在4cm。 2、玄武岩纤维改性沥青试验结果显示，随着掺量的增加，改性沥青的针入度、延度逐渐减小，软化点、弹性恢复、粘度随着纤维掺量的增加而增大。针入度、软化点、弹性恢复和粘度在玄武岩纤维掺量为0.2%~0.3%时接近高黏沥青的相应值，玄武岩纤维可有效改善沥青胶浆的高温性能、疲劳性能和抗水损坏性能。 3、对玄武岩纤维胶浆的机理分析可知，主要为纤维对沥青中轻质油分的吸附致使胶体结构的转变和纤维比表面积的增加和沥青发生了界面的相互作用，提高了D结构沥青的比例，再者纤维的加入对沥青胶浆起到了D加筋作用，增强了沥青胶浆的结构整体性。 4、在大孔隙开级配混合料中加入消石灰后，混合料的抗水损坏性能得到有效提高，并从材料的微观进行了机理分析。 5、玄武岩纤维可显著提高开级配沥青混合料的路用性能，但却降低了混合料的渗水、构造深度和降噪功能。从综合本研究的出发点低噪声路面和玄武岩纤维强化混合料性能两点考虑，玄武岩纤维的最佳掺量定为0.3%。
[Abstract]:At present, the research of basalt modified asphalt mixture started late in our country, and its application in open grading and noise reduction asphalt mixture is rarely reported, and many of its properties need to be further studied and verified. Through orthogonal test and standing wave tube test, this paper compares and analyzes the influence of different factors on the noise reduction performance of open-graded asphalt mixture, based on penetration test, softening point test, ductility test. Elastic recovery test and apparent viscosity test reveal the mechanism of basalt fiber and asphalt. At the same time the influence of fiber content on pavement performance of open-graded asphalt mixture is systematically studied. The construction technology of basalt fiber modified asphalt mixture is put forward. 1. The effects of four parameters on the noise reduction characteristics of open graded asphalt mixture are theoretically analyzed by orthogonal test. The results show that void ratio has the most important effect on the noise reduction performance of asphalt mixture. With the increase of pavement thickness, the noise reduction effect tends to be stable, and the thickness of pavement structure of open graded asphalt mixture can be controlled at 4cm in practical application. 2. The experimental results of basalt fiber modified asphalt show that the penetration and ductility of modified asphalt decrease gradually, the softening point and elastic recovery gradually decrease with the increase of the content of the modified asphalt. The viscosity increases with the increase of fiber content. The penetration, softening point, elastic recovery and viscosity are close to the corresponding value of high viscosity asphalt when the content of basalt fiber is 0.2-0.3. Basalt fiber can effectively improve the high temperature performance, fatigue performance and water damage resistance of asphalt mortar. 3. By analyzing the mechanism of basalt fiber slurry, it is known that the adsorption of fiber to light oil in asphalt leads to the transformation of colloidal structure, the increase of fiber specific surface area and the interfacial interaction of asphalt. The ratio of D structure asphalt is increased, and the addition of fiber plays a role of D reinforcement on asphalt mortar, and enhances the structural integrity of asphalt mortar. 4After adding quicklime to the mixture with macroporous gradation, the resistance to water damage of the mixture is improved effectively, and the mechanism of the mixture is analyzed from the microscopic point of view. 5. Basalt fiber can improve the pavement performance of asphalt mixture, but it can reduce the seepage of asphalt mixture. Structural depth and noise reduction function. Considering the performance of low noise pavement and basalt fiber reinforced mixture, the optimum content of basalt fiber is 0.3.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.217

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