硅酸盐基矿粉的表面修饰及在沥青中的应用性能研究

发布时间：2018-03-25 08:43

本文选题：硅酸盐基矿粉　切入点：硅烷偶联剂　出处：《哈尔滨工业大学》2015年硕士论文

【摘要】：硅酸盐基矿粉是一种用途广泛的无机填料,已经被应用到各个领域。在沥青混凝土制备过程中,硅酸盐基矿粉的加入可以改善油石比,同时提高沥青路面的防水性能。硅酸盐基矿粉是一种亲水性的非金属矿物填料,与沥青存在界面差异,使其难以在沥青中均匀分散。因此,需要对硅酸盐基矿粉进行表面改性,改善矿粉表面的物化性质,从而提高沥青的综合性能。本文开展的主要工作如下:选择一种目前常用的硅酸盐基矿粉,利用XRD、红外光谱、XPS等手段测定原矿粉性能。经测试选用的硅酸盐基矿粉为片沸石,属于架状硅酸盐的一种。矿粉的特征峰是位于3456cm-1和1626cm-1处的Si-OH的伸缩振动吸收峰和弯曲振动吸收峰。利用干法直接喷涂工艺改性原矿粉,选用的改性剂为KH-560、KH-570、辛基三乙氧基硅烷和丙基三乙氧基硅烷,改性后利用吸油值及接触角等方法进行预评价,选择出最佳改性剂为直链的丙基和辛基,接触角分别达到110°和115°。利用红外光谱、拉曼光谱,分析改性前后表面结构的变化,确定改性机理及改性效果。通过控制变量法,采用加热改性和直接喷涂改性两种工艺,确定每种方法的最佳改性工艺。实验表明两种方法都能很好地实现改性效果,接触角均可以达到115°。加热改性时间大大缩少,但是需要大量水和乙醇,以及大型专用设备。因此,本实验选择直接喷涂改性工艺。通过冻融劈裂实验来检测试件的水稳定性,实验表明改性后的试件,冻融劈裂强度比TSR值由61%升到84%,改性后的TSR值大于规范要求的75%;通过车辙实验来检测试件的抗高温性能,改性后的试件的冻稳定性DS值由4846次/mm升到6300次/mm,大于规范要求的3000次/mm。应用性能评价验证了矿粉的改性效果。
[Abstract]:Silicate based mineral powder is a widely used inorganic filler, which has been used in various fields. In the process of preparing asphalt concrete, the addition of silicate based mineral powder can improve the ratio of oil to stone. At the same time, the waterproof performance of asphalt pavement is improved. Silicate based mineral powder is a kind of hydrophilic nonmetallic mineral filler, which has interface difference with asphalt, which makes it difficult to disperse evenly in asphalt. Therefore, it is necessary to modify the surface of silicate based mineral powder. The main work of this paper is as follows: select a common silicate based mineral powder, The properties of raw ore powder were determined by means of XRD, IR spectroscopy and XPS. The silicate based ore powder was selected as flake zeolite. The characteristic peak of ore powder is the stretching vibration absorption peak and bending vibration absorption peak of Si-OH located at 3456cm-1 and 1626cm-1. The modifiers selected were KH-560 KH-570, octyl triethoxy silane and propyl triethoxy silane. After modification, oil absorption value and contact angle were used for pre-evaluation. The best modifiers were straight chain propyl group and octyl group. The contact angle reached 110 掳and 115 掳respectively. The changes of surface structure before and after modification were analyzed by IR and Raman spectra, and the modification mechanism and effect were determined. The experiment shows that both methods can achieve the modification effect very well, and the contact angle can reach 115 掳. The heating modification time is greatly reduced, but a large amount of water and ethanol are needed, as well as large scale special equipment. In this experiment, direct spray modification technology was selected. The water stability of the samples was tested by freeze-thaw splitting experiment. The ratio of freeze-thaw splitting strength to TSR was increased from 61% to 84%, and the modified TSR value was higher than that required by the specification. The high temperature resistance of the specimens was tested by rutting test. The frozen stability DS value of the modified sample was increased from 4846 times / mm to 6300 times / mm, which was higher than the 3000 times / m ~ (m) required by the specification. The modified effect of ore powder was verified by performance evaluation.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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