废胶粉对废食用油再生沥青性能影响的研究

发布时间：2018-09-14 09:55

【摘要】：废食用油的主要成分是油脂,类似于沥青中的油分,可以用于沥青再生。相关研究表明废食用油可使老化沥青物理性能恢复到原样沥青的70%-80%,但对抗高温变形和低温开裂性能的改善效果有待进一步提高。废胶粉是一种优良的沥青改性剂,可以有效改善沥青的高低温性能,同时其作为一种量大价廉的可再利用资源,具有广泛应用前景。在前期研究的基础上,本文以AH-50沥青为对象,通过实验室模拟获取老化沥青,掺入6.0wt%废食用植物油制备出再生沥青,研究废胶粉掺量(0.5 wt%-3.0 wt%)对再生沥青的常规物理性能、组分结构、流变性能的影响规律,确定废胶粉的最佳掺量,并研究最佳胶粉掺量下混合料的路用性能。主要结论如下:(1)废胶粉能使再生沥青的针入度恢复到原样AH-50沥青的水平,抗老化性能有所提高,软化点基本保持不变,延度则有降低的趋势,粘度随废胶粉掺量增加而增大;胶粉掺量为2.0 wt%时,再生沥青整体性能达到最优,满足《公路沥青路面施工技术规范》中沥青的使用要求。(2)废胶粉的掺入使得再生沥青中饱和分和芳香分含量降低,胶质和沥青质含量增加;再生沥青中的羰基和亚砜基含量略有增加,但仍远小于老化沥青的值,表明废胶粉在180℃高温加入再生沥青改性过程中,沥青略有热氧老化,这与组分测试中胶质和沥青质含量增加相符。(3)废胶粉的掺入能够有效提高再生沥青的模量以及高低温性能,改善废食用油再生沥青模量较低的不足;2.0 wt%的废胶粉掺入到废食用油再生沥青中后能够有效提高再生沥青的抗疲劳性能、抗变形能力、弹性恢复能力以及低温抗裂性能。(4)掺入废胶粉的废食用油再生沥青制备的沥青混合料,与AH-50和再生沥青的相比其路用性能有一定改善,沥青胶结料与骨料间的粘附力增大,其高温抗车辙性能、低温抗裂性能、抗水损害能力以及疲劳寿命均得到提高。综上所述,将废胶粉用于废食用油再生沥青的改性,能够提高其模量、高温抗变形能力和低温弹性恢复能力,对于废胶粉与废食用油的合理资源化利用与社会的可持续发展均具有重要的现实意义。
[Abstract]:The main component of waste edible oil is oil, which is similar to the oil in asphalt and can be used for asphalt regeneration. Relevant studies show that waste edible oil can restore the physical properties of aging asphalt to 70% - 80% of the original asphalt, but the improvement effect of high temperature deformation and low temperature cracking resistance needs to be further improved. The performance of asphalt at high and low temperatures can be effectively improved by adding additives, and as a large amount of cheap and reusable resources, it has a broad application prospect. On the basis of previous research, this paper takes AH-50 asphalt as the object, obtains the aging asphalt through laboratory simulation, mixes 6.0wt% waste edible vegetable oil to prepare recycled asphalt, and studies the mixing of waste rubber powder. The main conclusions are as follows: (1) Waste rubber powder can restore the penetration of recycled asphalt to the original AH-50 asphalt level, and the anti-aging performance has some advantages. When the content of rubber powder is 2.0 wt%, the overall performance of recycled asphalt reaches the optimum, which meets the requirements of asphalt in < Highway Asphalt Pavement Construction Code >. (2) The addition of waste rubber powder makes the saturation and aroma of recycled asphalt. The content of carbonyl group and sulfoxide group in recycled asphalt increased slightly, but it was still far less than the value of aging asphalt, indicating that the asphalt had a slight thermo-oxidative aging when the waste rubber powder was added to the recycled asphalt at 180 C, which was consistent with the increase of the content of resin and asphaltene in the component test. The addition of recycled asphalt can effectively improve the modulus and high-low temperature performance of recycled asphalt, and improve the low modulus of recycled asphalt of waste edible oil; 2.0 wt% waste rubber powder can effectively improve the fatigue resistance, deformation resistance, elastic recovery and low-temperature crack resistance of recycled asphalt. (4) The addition of waste edible oil into recycled asphalt can effectively improve the fatigue resistance, deformation resistance, elastic recovery and low-temperature crack resistance of recycl Compared with AH-50 and recycled asphalt, the asphalt mixture made from waste edible oil recycled asphalt of rubber powder has a certain improvement in pavement performance. The adhesion between asphalt binder and aggregate increases. Its high temperature rutting resistance, low temperature cracking resistance, water damage resistance and fatigue life are all improved. Modification of recycled asphalt from edible oil can improve its modulus, high temperature deformation resistance and low temperature elastic recovery ability. It has important practical significance for rational utilization of waste rubber powder and edible oil and sustainable development of society.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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