关键词: 道路工程　 铁尾矿　 沥青混合料　 材料组成　 性能评价　 自愈合性

Abstract: In order to make the designed of the iron tailings asphalt mixture composition more reasonable and improve the application level of iron tailings in asphalt mixtures,the relevant technical specifications of iron tailings sand were compared, the research status of the material composition of iron tailings asphalt mixtures was clarified,and the effects of factors such as asphalt type,iron tailings dosage and particle size,and admixtures on the performance of asphalt mixtures were investigated. The results showed that when the particle size of iron tailings sand is 0-0. 075 mm,the recommended dosage is 40%-60%; When the particle size is 0. 075-4. 75 mm,the recommended dosage is 26%-50%. The larger the particle size range of iron tailings sand,the more obvious its influence on the road performance of asphalt mixtures. The smaller the particle size and the larger the dosage of iron tailings,the better the self-healing performance of iron tailings asphalt mixtures. The high and low temperature characteristics of iron tailings asphalt mixtures are both improved compared with ordinary asphalt mixtures,and the problem of insufficient water stability of iron tailings after appropriate modification can be improved. Although there are many research results on iron tailings asphalt mixtures at present,the composition research of iron tailings asphalt mixtures for complex service scenarios still needs to be strengthened. 

Key words: road engineering,iron tailings,asphalt mixtures,material composition,performance evaluation,self-healing