基于响应面法的富油胶粉再生剂制备参数优化

Preparation Parameter Optimization on Oil-rich Rubber Powder Rejuvenator Based on Response Surface Methodology

为了研究不同制备参数下富油胶粉(ORR粉)再生剂的再生功效,采用响应面法建立了制备参数(制备温度、制备时间和胶粉掺量)与ORR粉再生沥青性能(针入度、软化点和10℃延度)的响应模型,优化了ORR粉再生剂的制备参数,探究了优化制备参数下ORR粉再生剂的性能及其再生功效。结果表明:制备温度、制备时间、胶粉掺量及其交互作用影响ORR粉再生剂对老化沥青的再生功效,单因素影响程度排序为:RP掺量>制备温度>制备时间。建议在224℃下将39%的胶粉(与WCO的质量比)与WCO共混61 min后制备ORR粉再生剂。此时,ORR粉再生剂基本满足RA-25型再生剂的技术要求,其可以显著软化老化沥青且有效恢复老化沥青的低温性能,但不明显削弱老化沥青的高温性能,使再生沥青达到70#基质沥青的性能水平。

To investigate the regeneration efficacy of oil-rich rubber(ORR)powder rejuvenator with different preparation parameters,the response surface methodology was applied to establish the response model of preparation parameters(e.g.,preparation temperature,preparation time,and rubber powder content)and the properties(e.g.,penetration,softening point,and 10℃ductility)of ORR recycled asphalt.The preparation parameters of ORR rejuvenator were optimized.The properties of ORR rejuvenator and its regeneration efficacy with optimized preparation parameters were investigated.The result indicates that the regeneration of ORR rejuvenator to aged asphalt is affected by preparation temperature,preparation time,rubber power content and interaction.The influencing degree rank of single factor as follows:rubber power content>preparation temperature>preparation time.It is recommended that the ORR rejuvenator should be prepared by mixing 39%rubber powder(mass ratio to WCO)with WCO at 224℃for 61 m.On this occasion,ORR rejuvenator basically meets the technical requirements of RA-25 rejuvenator,which can significantly soften and effectively restore the low temperature performance of aged asphalt,but does not significantly weaken its high temperature performance.Therefore the recycled asphalt reaches the performance level of base asphalt 70^(#).