Progress in combined modification of rubberized asphalt

The traditional rubberized asphalt has various disadvantages such as low resistance to rutting, difficulty in stabilized during manufacture, poor fluidity during processing and pollution. Combined modification of rubberized asphalt is reviewed in this paper for developing an effective way to resolve the above mentioned problems. According to the chemical properties of rubber asphalt composite modifiers, it is divided into four types: polymer, inorganic substance, plasticizer and other four types. The reasons for the incorporation of each type of composite modifier and the current research and application status at home and abroad are introduced. The advantages and disadvantages and modification mechanisms of various composite modifiers are reviewed. It is believed that the existence of chemical cross-linking network of rubber powder brings challenges to the compounding process and effect evaluation. Nevertheless, compound modification and environmentally friendly processing of multiple modifiers under the premise of green de-crosslinking is the future development direction of rubber asphalt.