Key Technology of Steel Slag Full Granularity Road Cascade Application
As a pavement aggregate,steel slag has a rough and porous surface,and has good adhesion,which can effectively improve the compressive strength,durability and skid resistance,thermal stability and water stability.As pavement base aggregate,its strength and deformation ability can reduce the dry shrinkage strain and temperature shrinkage strain,which is conducive to improving the crack resistance and greatly improving the road performance.Based on the characteristics of steel slag aggregate,a method for determining the effective relative density of steel slag by asphalt impregnation method was established by replacing the asphalt gravel with a particle size of 5～15 mm in this project.A volume-mass conversion method suitable for the design of the mix ratio of steel slag was proposed.Based on the hydration expansion characteristics of steel slag,the evaluation method of the volume stability of steel slag aggregate was established by replacing the base stone with steel slag with the particle size of 0～5 mm,and the suspension dense gradation design method was proposed.Based on gelling reaction,the non-uniform expansion inhibition technology of steel slag was established by adding fly ash.The application of steel slag classification to the pavement surface and base material can make full particle size and large-scale use of steel slag,which can effectively alleviate the problems of steel slag accumulation and the shortage of high-quality gravel aggregate,reduce the cost of highway engineering and improve the quality of engineering.
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