This paper explores the feasibility of preparing different micro-structures of desulfurization waste rubber powder (WRP) by using mechanochemical and thermochemical

and its effect on the properties of modified asphalt. The results show that different micro-structures of desulfurization WRP can be prepared by the two methods. Due to the different desulfurization mechanism

the micro morphology of desulfurization WRP prepared by the two methods is different. With increasing reaction temperature

the crosslink density and sulfur content of desulfurization WRP decrease

and the oxygen content increases. The content and PDI of sol component in the desulfurization WRP increase

and the

M

n

decreases. With the reaction temperature increases

the processing workability of desulfurized WRP modified asphalt is enhanced with the reduced in its high-temperature performance and resilience. The storage stability of desulfurized WRP modified asphalt is weakened first and then enhanced. The low-temperature performance of mechanochemical desulfurized WRP modified asphalt is reduced first and then increased

while it is reduced for thermochemical desulfurized WRP modified asphalt. With the particle size of WRP decreases

the crosslink density and sulfur content of thermochemical desulfurized WRP decrease

and the oxygen content increases. The content and PDI of sol component increase

and the

M

n

decreases. It is reversed for mechanochemical desulfurized WRP. With the particle size of WRP decreases

the storage stability of desulfurization WRP modified asphalt was enhanced. The high and low temperature properties and resilience of mechanochemical desulfurized WRP modified asphalt are enhanced

while these are reversed for thermochemical desulfurized WRP modified asphalt.