废旧胶粉的反应与交联作用对橡胶沥青黏度的影响

发布时间：2018-12-23 11:13

【摘要】：以布氏旋转黏度为指标,研究了废旧胶粉掺量、粒径、制备工艺等特性对橡胶沥青以及滤除胶粉后改性沥青黏度的影响,并采用凝胶色谱试验分析了沥青大分子(LMS)的变化,在此基础上,探讨了胶粉与沥青的反应作用(IE)与胶粉颗粒在沥青中的交联作用(PE)对橡胶沥青黏度的影响机理。研究结果表明:随着胶粉掺量的增加,橡胶沥青的黏度、胶粉与沥青的反应作用及未反应胶粉的交联作用、LMS含量也逐渐增大,滤除未反应胶粉颗粒后的改性沥青黏度增长并不明显;常温胶粉改性沥青的黏度、胶粉与沥青的反应作用和未反应胶粉的交联作用明显高于冷冻胶粉改性沥青的黏度,而80目或高掺量冷冻胶粉改性沥青过滤沥青的黏度大于常温胶粉改性沥青过滤沥青的黏度,不同生产工艺胶粉改性沥青的LMS含量没有明显变化规律;40目的废旧胶粉改性沥青的黏度和未反应胶粉的交联作用较30目和80目大,而80目常温胶粉改性沥青中胶粉与沥青的反应作用最大,增加冷冻胶粉的细度对于增加滤除未反应胶粉颗粒后改性沥青的黏度更有效,胶粉粒径越小,橡胶沥青LMS含量越大;橡胶沥青的LMS与黏度有较为显著的相关性,与其IE有一定的相关性,而与PE的相关性较差。废旧胶粉特性对橡胶沥青的黏度影响显著,合理地选择废旧胶粉参数有助于制备高性能的橡胶沥青。
[Abstract]:The effects of the content of waste rubber powder, particle size and preparation process on the viscosity of rubber asphalt and modified asphalt after removing rubber powder were studied with Brinell rotational viscosity as the index. The change of (LMS) of asphalt macromolecule was analyzed by gel chromatography. On the basis of this, the mechanism of the effect of (PE) on the viscosity of rubber asphalt was discussed by the reaction between rubber powder and asphalt. The crosslinking action of (IE) and rubber particle in asphalt was discussed. The results show that with the increase of rubber powder content, the viscosity of rubber asphalt, the reaction between rubber powder and asphalt and the cross-linking effect of unreacted rubber powder, the content of LMS increases gradually. The viscosity of modified asphalt after filtration of unreacted rubber particles is not obvious. The viscosity of asphalt modified by rubber powder at room temperature, the reaction between rubber powder and asphalt, and the crosslinking effect of unreacted rubber powder were obviously higher than those of asphalt modified by frozen rubber powder. However, the viscosity of modified asphalt with 80 mesh or high content of refrigerated rubber powder is higher than that of asphalt modified by rubber powder at room temperature, and the LMS content of asphalt modified by rubber powder has no obvious change rule. 40 objective the viscosity of asphalt modified by waste rubber powder and the crosslinking effect of unreacted rubber powder are larger than those of 30 mesh and 80 mesh, but the reaction between rubber powder and asphalt is the most in 80 mesh ambient temperature modified asphalt. Increasing the fineness of frozen rubber powder is more effective to increase the viscosity of modified asphalt after removing unreacted rubber powder particles. The smaller the particle size of rubber powder, the greater the LMS content of rubber asphalt. The LMS of rubber asphalt has a significant correlation with viscosity, IE and PE. The properties of waste rubber powder have a significant effect on the viscosity of rubber asphalt. Reasonable selection of waste rubber powder parameters is helpful to the preparation of high performance rubber asphalt.
【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;甘肃省交通科学研究院有限公司;甘肃路桥建设集团有限公司甘肃省道面工程技术研究中心;
【基金】：国家自然科学基金项目(51408287,51668038) 教育部长江学者和创新团队发展计划项目(IRT_15R29) 甘肃省杰出青年基金项目(1606RJDA318) 甘肃省自然科学基金项目(1506RJZA064) 兰州交通大学优秀科研团队项目(201606)
【分类号】：U414

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