基于响应面法的废口罩纤维改性沥青制备工艺研究

Experimental study on the preparation process of waste mask fiber modified asphalt based on response surface methodology

为有效高值再利用废弃口罩,将废口罩用作改性沥青的改性剂,利用响应面法确定废口罩纤维改性沥青的最佳制备工艺,分析废口罩改性沥青随剪切时间、剪切速率、剪切温度的变化规律。研究得到废口罩纤维改性沥青制备工艺的响应面模型,模型预测计算得到最佳制备工艺参数为剪切时间45 min、剪切速率4145 r/min、剪切温度167℃,与试验验证结果一致。在最佳制备工艺和掺量下,废口罩纤维改性沥青较基质沥青的软化点显著升高,延度、针入度下降。

In order to effectively utilize waste masks,this research studied the technology of using waste masks in the preparation of modified asphalt.Response surface methodology was used to determine the optimal preparation process for mask fiber modified asphalt,and the changes in asphalt with shear time,shear rate,and shear temperature were analyzed.The study found that the optimal preparation process for mask fiber modified asphalt is a shear time of 45 min,a shear rate of 4145 r/min,and a shear temperature of 167℃,which is consistent with experimental verification.Under the optimal preparation process and dosage,the softening point of the base asphalt significantly increases,while the ductility and penetration decrease significantly.