新型无机阻燃改性沥青的制备与路用性能研究

发布时间：2018-11-02 15:23

【摘要】：为开发纯无机阻燃改性沥青,选择阻燃性能高、低碳、无污染、价格低廉的无机材料作沥青阻燃剂,凭借改性沥青3大指标试验确定无机阻燃改性沥青的最佳制备工艺;借助极限氧指数和燃烧烟密度试验,深入研究了无机阻燃剂掺量与类型对阻燃改性沥青阻燃、抑烟性能的影响规律;采用热重试验系统的分析无机阻燃改性沥青的阻燃机理;通过对无机阻燃改性沥青进行3大指标、黏度、抗老化性能、黏附性试验,系统研究无机阻燃剂掺量对改性沥青路用性能的影响规律,最后对无机阻燃改性沥青的经济效益进行分析。结果表明:无机阻燃剂具有较好的阻燃抑烟性能,满足国家相应规范的要求;提高阻燃剂的掺量,可以明显增加无机阻燃沥青的阻燃性能,抑烟材料在发挥抑烟功能的同时,可以提高无机阻燃剂的阻燃性能,克服了以往材料阻燃和抑烟相矛盾的缺点;无机阻燃剂通过分解、释放水分,以及层状金属氧化物的吸附性能发挥阻燃作用;随着无机阻燃剂掺量的增加,无机阻燃改性沥青的针入度减小,软化点增高,延度降低,黏度增加,老化后针入度比增加,黏度提高;无机阻燃剂的加入,不影响SBS改性沥青黏附性的发挥;无机阻燃剂具有极好的经济效益,适合在路面阻燃沥青混合料中推广应用。
[Abstract]:In order to develop pure inorganic flame retardant modified asphalt, inorganic materials with high flame retardancy, low carbon, no pollution and low price were selected as flame retardant agent, and the optimum preparation process of inorganic flame retardant modified asphalt was determined by three indexes of modified asphalt. With the help of limiting oxygen index and smoke density test, the effects of the amount and type of inorganic flame retardant on the flame retardancy and smoke inhibition of the modified asphalt were studied, and the flame retardant mechanism of the inorganic flame retardant modified asphalt was analyzed by thermogravimetric test system. The effects of inorganic flame retardants on the road performance of modified asphalt were studied systematically through the tests of three indexes, viscosity, aging resistance and adhesion. Finally, the economic benefits of inorganic flame retardant modified asphalt are analyzed. The results show that the inorganic flame retardant has better flame retardancy and smoke suppression performance, and meets the requirements of the corresponding national specifications. Increasing the amount of flame retardant can obviously increase the flame retardancy of inorganic flame retardant asphalt. The smoke suppressant can improve the flame retardancy of inorganic flame retardant at the same time, which overcomes the contradiction between flame retardant and smoke suppression in the past. Inorganic flame retardants play a flame-retardant role through decomposition, release of water, and adsorption of layered metal oxides. With the increase of the content of inorganic flame retardant, the penetration of inorganic flame retardant modified asphalt decreases, the softening point increases, the ductility decreases, the viscosity increases, the penetration ratio increases and the viscosity increases after aging. The addition of inorganic flame retardant does not affect the performance of adhesion of SBS modified asphalt. Inorganic flame retardant has excellent economic benefits and is suitable for popularization and application in pavement flame retardant asphalt mixture.
【作者单位】：同济大学土木工程学院;天津市市政工程设计研究院;长安大学公路学院;
【基金】：天津市市政公路管理局科技项目(2012-23)
【分类号】：U414

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