In order to study the best modification conditions of waste rubber powder/SBS compos-ite modified asphalt,70# matrix asphalt as raw materials,the use of conventional indicators and rheo-logical indicators to determine the fineness of waste rubber powder,dosage and SBS dosage of the opti-mal efficiency interval.The results show that from the modification effect and cost control considera-tions,when the fineness of the rubber powder is 60 mesh,the dosage of 20％,SBS dosage of 3％,the modified asphalt composite modification effect is optimal.This study for the waste rubber powder/SBS composite modified asphalt in the practical application of engineering provides a useful reference and guidance.
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