论文标题:微波辐射活化废胶粉改性沥青性能及共混机理研究
Research on Performance and Crossblend Mechanism of Microwave Radiant Crumb Rubber Modified Asphalt
论文作者
论文导师 肖鹏,论文学位 硕士,论文专业 结构工程
论文单位 扬州大学,点击次数 542,论文页数 101页File Size7245K
2006-05-12论文网 http://www.lw23.com/lunwen_3985252/
crumb rubber powder;; modified asphalt;; microwave radiate;; activate;; crossblend mechanism
随着我国经济的迅猛发展，汽车保有量逐年迅速增长，我国已经开始面临大量废旧轮胎的处理问题。而已有的研究表明废胶粉能改善沥青的路用性能。废胶粉改性沥青将危及人们生活环境的污染物废橡胶与沥青性能的改善结合起来，降低改性沥青的生产成本，赋予改性沥青特殊的性能，是集节能、环保和新产品开发为一体的不可再生能源再生利用的有效途径。废胶粉改性沥青和沥青混合料在我国公路工程中的应用前景广阔。 由于废胶粉改性沥青性能不稳定，关键问题并未解决，因此一直未能实现大规模的生产和应用。对废胶粉表面进行活化，从而提升废胶粉改性沥青性能，已经成为促进其推广和应用的关键技术。 本论文在分析总结前人研究成果的基础上，提出了微波辐射活化废胶粉的工艺，并对微波辐射废胶粉改性沥青及混合料进行了大量试验和研究，为废胶粉改性沥青的推广开辟了一条新路。 本论文首先研究了废胶粉和沥青之间的相互作用，提出了废胶粉改性沥青的制备工艺。试验结果表明：80目的废胶粉对于沥青的改性是适宜的，废胶粉的最佳掺量为15％～20％；制备的工艺宜选择180℃条件下，以7000rpm的速度剪切1小时左右。性能测试发现废胶粉改性可以提高沥青的软化点和低温延度，而针入度却明显的降低。 研究发现废胶粉的存储稳定性并不是很好，废胶粉和沥青之间相容性差。本文根据道路沥青特点，提出了微波辐射的表面活化方法，使废胶粉在处理后能够更好的与沥青相容。通过正交设计考察了微波功率和辐射时间对辐射废胶粉改性沥青性能的影响。结果表明：微波活化有一个最佳功率和最佳时间的组合：功率1000w，时间60s。 本论文采用常规、非常规试验方法和美国SHRP方法对废胶粉改性沥青和微波辐射废胶粉改性沥青及其混合料技术性能进行测试，得到两种改性沥青的性能指标，并对试验结果进行分析和对比。对比评价的结果：微。波辐射废胶粉改性沥青的温度敏感性能、高温性能、低温性能、抗老化性能以及存储稳定性能均好于普通废胶粉改性沥青的性能。而沥青混合料和沥青对应的性能指标评价结论也是比较的一致。 通过电子扫描显微镜(SEM)形貌观测及X射线能谱仪元素分析和废胶粉的溶胀试验研究了微波辐射废胶粉的活化机理。利用电子扫描显微镜(SEM)、红外光谱(IR)、差示热量扫描(DSC)、核磁共振(NMR)等现代分析技术研究了微波辐射废胶粉改性沥青的共混机理。研究结果较好地说明了微波辐射活化技术的效用，同时也验证了其对沥青改性性能的优越性。 本论文得到的试验数据和研究成果对废胶粉改性沥青的推广和应用具有较大的意义。
With rapid development of the economic growth and car availability ofour country, we now come to confront a treatment question of crumb rubbertire. Studies showed that crumb rubber powder could improve the roadperformance of asphalt. Crumb rubber modified asphalt (CRM) combinescrumb rubber tire with the improvement of asphalt, which can reduce the costof modified asphalt and give it special capability. It is a material of energysaving, environmental protection, new product protection all rolled into one.The CRM and its mixture have broad prospects in road engineering. Because of unstable and unsolved questions, CRM was failed to largescale production and application. Activate the performance of crumb rubberpowder to improve the capability of CRM is of great importance. On the basis of the relevant research, microwave radiation activatetechnique was brought up. Then numerous experiments were conducted tolucubrate the performance of microwave radiant crumb rubber modifiedasphalt (MRCRM) and mixture. It beats up a new path to popularize CRM. Interactions between crumb rubber powder and asphalt were studied andgained a preparation technique. It shows as the follows. Crumb rubber powderwhose diameter is 80 meshes is proper to modify asphalt. The optimal contentis about 15%～20%.At temperature of 180℃, speed of 7000rpm, it needsshearing the modifier about 1h. Significance testing shows that crumb rubberpowder can improve the softening point and low temperature ductility butminish the penetration. Research has detected that the compatibility between crumb rubberpowder and asphalt, and the hotstorage stability of CRM was poor. Accordingto the characteristic of asphalt, microwave radiation activate technique wasbrought up to improve their compatibility. The performance effects of powerand time were investigated by orthogonal design. The result has revealed thatit has an optimal power and an optimal time (1000w, 60s). Conventional, unconventional and SHRP testing methods were adopted to evaluate the CRM and MRCRM and their mixtures, then the data wereanalyzed and compared. The result shows that the MRCRM is better than theCRM in terms of the high-temperature stability, low temperature performance,anti-fatigue and hot storage stability. The tests of mixtures validate the rule. SEM, EDS and swelling test were adopted to analyze the activatemechanism of microwave radiate crumb rubber powder. Modern analysistechniques such as SEM, IR, DSC and NMR were adopted to investigate thecrossblend mechanism of MRCRM. The avail of microwave radiate techniquewas well explained. The data and the production of the research contribute significantly to thetheory development and the practical application of CRM.
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