废胶粉及再生低密度聚乙烯复合改性沥青性能研究
发布时间：2018-07-15 20:01
【摘要】：橡胶类改性剂对沥青性能的改善比较全面,不仅能够提升沥青的高温抗变形能力,而且对沥青低温柔韧性的改善作用也非常明显;而聚乙烯类改性剂虽然能够大幅提升沥青的硬度,降低路面在高温、车辆荷载作用下的变形,但对沥青低温性能的改善作用有限。考虑到两类改性剂的各自特点,以及当前废旧聚合物所引发的日益严重的环境问题,本文以废轮胎橡胶粉(WTR)和再生低密度聚乙烯(RPE)为改性剂,制备了WTR/RPE复合改性沥青,并对其加工工艺、性能以及作用机理进行了试验研究。本文的主要内容如下:首先,利用正交试验方法研究了加工工艺对WTR/RPE复合改性沥青的针入度、软化点、延度等常规性能的影响,结果表明加工工艺对WTR/RPE复合改性沥青的性能有重要影响。此外,通过对试验结果进行直观分析,得到了不同工艺参数对WTR/RPE复合改性沥青各项性能的影响规律,并确定了高速剪切搅拌法制备WTR/RPE复合改性沥青的最佳工艺。其次,从常规性能、流变性能、老化性能三个方面对WTR/RPE复合改性沥青的性能进行了评价。结果表明复合改性后,WTR和RPE在复合改性沥青中形成了聚合物网状结构,沥青的高温性能和抗老化能力得到了明显的改善;然而WTR/RPE复合改性对沥青低温性能的影响有待商榷,因为相对于基质沥青,尽管WTR/RPE复合改性沥青有较好的低温柔性,但其低温时的应力分散能力较差。最后,采用荧光显微镜、红外光谱、热重和示差扫描量热分析等微观手段分析了WTR/RPE和沥青的相互作用机理。结果表明WTR和RPE对沥青的复合改性既包含物理改性也包含化学改性;加入沥青后,WTR与RPE相互粘附,在沥青相中形成了均匀连续的网状结构,不仅使RPE的粒径变小、分散程度增加,而且也改善了RPE与沥青相的相容性;另外,经WTR/RPE复合改性后,沥青的热稳定性得到了明显的改善,其各组分的热力学性质更趋于一致。
[Abstract]:Rubber modifier can not only improve asphalt performance at high temperature, but also improve asphalt flexibility at low temperature. Although polyethylene modifier can greatly improve the hardness of asphalt and reduce the deformation of pavement under high temperature and vehicle load, the improvement of asphalt performance at low temperature is limited. Considering the characteristics of the two modifiers and the increasingly serious environmental problems caused by the waste polymer, WTR / RPE composite modified asphalt was prepared with waste tire rubber powder (WTR) and recycled low density polyethylene (RPE) as modifiers. The processing technology, properties and action mechanism were studied experimentally. The main contents of this paper are as follows: firstly, the effects of processing technology on the penetration, softening point and ductility of WTR / RPE composite modified asphalt are studied by orthogonal test. The results show that the processing technology has an important effect on the properties of WTR / RPE composite modified asphalt. In addition, the effects of different technological parameters on the properties of WTR / RPE composite modified asphalt were obtained by analyzing the test results directly, and the optimum process of preparing WTR / RPE composite modified asphalt by high speed shear stirring method was determined. Secondly, the performance of WTR / RPE composite modified asphalt was evaluated from three aspects: conventional performance, rheological property and aging property. The results showed that the composite modification of WTR and RPE formed polymer network structure in the composite modified asphalt, and the high temperature performance and aging resistance of the asphalt were improved obviously, but the influence of WTR / RPE composite modification on the low temperature performance of the asphalt was discussed. Compared with the base asphalt, WTR / RPE composite modified asphalt has better low temperature flexibility, but its stress dispersion ability is poor at low temperature. Finally, the interaction mechanism between WTR / RPE and asphalt was analyzed by means of fluorescence microscope, infrared spectrum, thermogravimetric and differential scanning calorimetry. The results show that the composite modification of asphalt by WTR and RPE includes both physical modification and chemical modification, and after adding asphalt, WTR adheres to RPE and forms a uniform and continuous network structure in the asphalt phase, which not only makes the particle size of RPE smaller, The degree of dispersion increased and the compatibility between RPE and asphalt phase was improved. In addition, the thermal stability of asphalt was obviously improved after modified by WTR / RPE, and the thermodynamic properties of each component were more consistent.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
本文编号：2125221
[Abstract]:Rubber modifier can not only improve asphalt performance at high temperature, but also improve asphalt flexibility at low temperature. Although polyethylene modifier can greatly improve the hardness of asphalt and reduce the deformation of pavement under high temperature and vehicle load, the improvement of asphalt performance at low temperature is limited. Considering the characteristics of the two modifiers and the increasingly serious environmental problems caused by the waste polymer, WTR / RPE composite modified asphalt was prepared with waste tire rubber powder (WTR) and recycled low density polyethylene (RPE) as modifiers. The processing technology, properties and action mechanism were studied experimentally. The main contents of this paper are as follows: firstly, the effects of processing technology on the penetration, softening point and ductility of WTR / RPE composite modified asphalt are studied by orthogonal test. The results show that the processing technology has an important effect on the properties of WTR / RPE composite modified asphalt. In addition, the effects of different technological parameters on the properties of WTR / RPE composite modified asphalt were obtained by analyzing the test results directly, and the optimum process of preparing WTR / RPE composite modified asphalt by high speed shear stirring method was determined. Secondly, the performance of WTR / RPE composite modified asphalt was evaluated from three aspects: conventional performance, rheological property and aging property. The results showed that the composite modification of WTR and RPE formed polymer network structure in the composite modified asphalt, and the high temperature performance and aging resistance of the asphalt were improved obviously, but the influence of WTR / RPE composite modification on the low temperature performance of the asphalt was discussed. Compared with the base asphalt, WTR / RPE composite modified asphalt has better low temperature flexibility, but its stress dispersion ability is poor at low temperature. Finally, the interaction mechanism between WTR / RPE and asphalt was analyzed by means of fluorescence microscope, infrared spectrum, thermogravimetric and differential scanning calorimetry. The results show that the composite modification of asphalt by WTR and RPE includes both physical modification and chemical modification, and after adding asphalt, WTR adheres to RPE and forms a uniform and continuous network structure in the asphalt phase, which not only makes the particle size of RPE smaller, The degree of dispersion increased and the compatibility between RPE and asphalt phase was improved. In addition, the thermal stability of asphalt was obviously improved after modified by WTR / RPE, and the thermodynamic properties of each component were more consistent.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414
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