Application of Steel Slag Asphalt Mixture for Road Engineering
In order to summarize the research status of steel slag in the field of road engineering,promote the application of steel slag asphalt mixture,grasp its development status and sort out its development needs,the domestic and international application and research progress of steel slag asphalt mixture are reviewed.The influence of steel slag content change on the road performance of asphalt mixture is analyzed by summarizing and analyzing the preparation and construction technology of steel slag asphalt mixture.The advantages and disadvantages of steel slag asphalt mixture at present are summarized.Finally,the economic benefits,volume expansibility and environmental impact of steel slag asphalt mixture are evaluated,aiming at providing inspiration and reference for further research and application of steel slag asphalt mixture.The result shows that(1)the steel slag asphalt pavement has the advantages of superior road performance,long service life and green environmental protection,which have been verified in several engineering practices;(2)when preparing steel slag asphalt mixture,the difference of gradation,raw material type and preparation technology have key effects on the performance of the mixture;(3)in the construction process,due to the particularity of steel slag,it is necessary to strictly control the temperature and uniformity of transportation,spreading and rolling stages;(4)the content of steel slag has a significant impact on the road performance of asphalt mixture,the proper inclusion of steel slag can improve the water stability,high temperature stability,fatigue resistance and skid resistance of asphalt mixture,but reducing the volume stability,therefore,it is suggested that the appropriate content range of steel slag is 40%-50%considering all indicators;(5)in the promotion and application of steel slag asphalt mixture,the economic benefits of different regions should be evaluated comprehensively,and the appropriate steel slag treatment process should be selected to further improve the application performance of steel slag,and improve the treatment efficiency and reduce the cost,so as to bring better flexibility and sustainability for engineering construction.
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