废食用植物油对老化沥青物理化学及流变性能的影响

发布时间：2018-06-06 03:06

本文选题：沥青 + 老化　；参考：《武汉理工大学》2014年硕士论文

【摘要】：沥青混凝土路面以其优良的路用性能已被广泛应用于公路建设。随着公路网的日趋完善，公路维修与重建已占据主导地位，其中废旧沥青混合料的再生利用日益受到重视。沥青因老化而变硬变脆，，导致沥青柔韧性和抗疲劳的性能等性能变差。沥青再生可以看作是沥青老化的逆过程，根据组分调节理论，废食用油可以作为一种低粘度油分用于老化沥青再生，并已有文献报道了其可行性，但尚未指出其存在的不足及其对基质沥青和改性沥青影响的差异。本文采用旋转薄膜烘箱加热和压力老化实验分别对SBS改性沥青、AH-50、AH-70三种沥青进行了老化，以获取不同种类的老化沥青，在老化沥青中掺加3.0%~7.0%的废食用植物油，以研究废食用植物油对不同老化沥青的物理性能，流变性能和组成结构的影响规律，主要得到以下结论：（1）在4.0%，5.0%，6.0%的废食用植物油掺量下，AH-50、AH-70和SBS三种老化沥青的各个物理指标和流变性能指标基本都能够恢复到其对应的原样沥青水平。同时，废食用油植物油主要是通过降低老化沥青中沥青质的含量及羰基官能团和亚砜基官能团的强度，实现对老化沥青的再生。（2）废食用植物油的掺入能够有效地软化老化沥青，并且增加再生沥青的抗疲劳性能；适宜掺量的废食用植物油可改善老化沥青的抗老化性能、温度敏感性、粘弹性和抗车辙能力；然而，掺加废食用植物油的再生沥青的热稳定性、低温柔韧性和弹性有待进一步改善。（3）废食用植物油对不同类型的老化沥青的作用效果存在差异，这与沥青本身的组成和结构有关。例如，以各物理指标指标恢复到原样沥青的水平为参考，废食用植物油对同一老化沥青的不同物理性能指标和不同老化沥青的同一个物理性能指标的改善效果不同。综上所述，将废食用油用于废旧沥青和废旧沥青混合料的再生，对于废弃物的利用、资源与能源的节约、生态环境保护和社会的可持续发展具有重要的现实意义。废食用油用于老化沥青再生前景广阔，但再生沥青的性能有待进一步改善。
[Abstract]:Asphalt concrete pavement has been widely used in highway construction for its excellent road performance. With the improvement of highway network, highway maintenance and reconstruction have played a leading role, among which the recycling of waste asphalt mixture has been paid more and more attention. Asphalt is hardened and brittle due to aging, which results in the deterioration of its flexibility and fatigue resistance. Asphalt regeneration can be regarded as an inverse process of asphalt aging. According to the theory of component adjustment, waste cooking oil can be used as a low viscosity oil to regenerate aged asphalt, and its feasibility has been reported. However, it has not been pointed out its deficiency and the difference of its influence on the base asphalt and the modified asphalt. In this paper, three kinds of SBS modified asphalt, AH-50 and AH-70, were aged by rotating film oven heating and pressure-aging experiments respectively, in order to obtain different kinds of aging asphalt, 3.0% of waste edible vegetable oil was added to the aging asphalt. In order to study the effects of waste edible vegetable oil on the physical properties, rheological properties and composition structure of different aging asphalt, the following conclusions are obtained: 1) each physical index and rheological property index of AH-50 AH-70 and SBS aging asphalt can basically recover to the corresponding original asphalt level under the dosage of 5.0% waste vegetable oil of 4.0% and 5.0% of waste edible vegetable oil. At the same time, the regeneration of aged asphalt was realized by reducing the content of asphaltene and the strength of carbonyl functional group and sulfoxide functional group in the waste edible oil vegetable oil. 2) the addition of waste edible vegetable oil can effectively soften the aging asphalt and increase the fatigue resistance of the recycled asphalt, and the suitable amount of waste edible vegetable oil can improve the aging resistance and temperature sensitivity of the aging asphalt. Viscoelasticity and rutting resistance, however, the thermal stability, low temperature flexibility and elasticity of recycled asphalt with waste edible vegetable oil need to be further improved. 3) the effect of waste edible vegetable oil on different types of aging asphalt is different, which is related to the composition and structure of asphalt itself. For example, different physical properties of the same aging asphalt and the same physical properties of the different aging asphalt are improved by waste edible vegetable oil as the reference of restoring each physical index to the original bitumen, and the improvement effect of the waste edible vegetable oil on the same aging asphalt and the same physical performance index of the different aging asphalt is different. To sum up, the application of waste cooking oil to the recycling of waste asphalt and waste asphalt mixture has important practical significance for the utilization of waste, the conservation of resources and energy, the protection of ecological environment and the sustainable development of society. Waste cooking oil is widely used in the regeneration of aged asphalt, but the performance of recycled asphalt needs to be further improved.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】