Aiming at the problems of rubber asphalt high viscosity,poor storage stability,high pollution in construction and the low recycling degree of waste cooking oil,the technology on crumb rubber pre-desulfurization with waste cooking oil was proposed.The mixture of waste cooking oil and crumb rubber prepared at high temperature was used to modify the matrix asphalt.The storage stability of waste cooking oil pre-desulfurized crumb rubber modified asphalt was evaluated by using the segregation experiment.Through the Brookfield rotational viscosity test,dynamic shear rheology test and bending beam rheological test,the rheological properties of waste cooking oil pre-desulfurized crumb rubber modified asphalt were studied in depth.The influences of different mixture types of waste cooking oil and crumb rubber on rheological properties were analyzed,e.g.,viscosity,failure temperature,complex modulus,phase angle,creep stiffness,and creep rate.The result indicates that compared with rubber asphalt,the storage stability of waste cooking oil pre-desulfurized rubber powder modified asphalt is greatly improved.The modified asphalt processing time has little effect on the segregation index.The modified asphalt with pre-desulfurized crumb rubber has good processing fluidity and low viscosity sensitivity to temperature.When the mixture of waste cooking oil and crumb rubber is added,the asphalt failure temperature and complex modulus are reduced;and the high temperature resistance to rutting deformation is weakened.With the phase angle decreases,the deformation recovery ability is improved.The failure temperature of modified asphalt has the linear increasing relation with the processing time.As the zero shear viscosity of mixture of waste cooking oil and crumb rubber increases,the high temperature performance of modified asphalt is significantly improved.The mixture of waste cooking oil and crumb rubber has the significant effect on improving the low temperature crack resistance of matrix asphalt.By extending the preparation time,the asphalt complex modulus increases,and the phase angle decreases.The failure temperature is up to 75℃,which is better than that of matrix asphalt.The creep stiffness increases and the creep rate decreases at ― 36℃;but it still has excellent low temperature cracking resistance compared with the matrix asphalt.
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