Study on the Formulation of Nano-SiO2/UP Composite Modified Asphalt
Generally,the UP materials will be brittle after curing,which needs toughening modification.In view of the excellent mechanical properties of nano-SiO2/UP composite materials,the formulation of nano-SiO2/UP modified asphalt,including the types of nano-SiO2,the dosage of various additives,etc.was studied in this paper.The optimal ratio of nano-SiO2/UP modified asphalt was determined by tensile test and segregation test.The results showed that component A and component B in nano-SiO2/UP modified asphalt should be prepared by the"first admixing method",in which component A was divided into UP,initiator,and coupling agent,and component B was a mixture composed of asphalt,compatibilizer,and other admixtures.The optimal ratio was m(component A)∶m(component B)=1∶2.6,where the composition of component A was m(UP):m(type A nano-SiO2)∶m(initiator)∶m(coupling agent)=100∶3∶4∶3,and the composition of component B was m(asphalt):m(compatibilizer)=100∶4.
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