Preparation technology of polyurethane modified asphalt based on orthogonal test
In order to determine the preparation scheme of polyurethane modified asphalt,a three-level L9(33)orthogonal test table was designed based on three factors of preparation process,polyurethane content and curing agent content,the effects of polyurethane content,preparation technology and curing agent content on the 7 d splitting tensile strength and freeze-thaw splitting strength ratio of polyurethane asphalt mixture were analyzed.The mechanical properties of polyurethane modified asphalt were analyzed based on tensile strength and elongation at break.The results show that when the content of polyurethane modifier is 50％and the content of curing agent is 6.0％,the performance of polyurethane modified asphalt is better,and the tensile performance and flexibility of polyurethane modified asphalt are excellent,it is suitable for pavement structure pavement and provides a new idea for the research and development of polyurethane modified asphalt.
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