Study on steel slag aging treatment and water immersion stability of steel slag asphalt concrete
This paper studied the effect of different aging time on the volume expansion and mechanical reduction of steel slag asphalt concrete under long-term immersion.Test section was paved to further evaluate the durability of steel slag asphalt concrete pavement.The test results indicated that fresh steel slag had poor stability and blended with different kinds of slag.The content of white slag was high.The aging treatment should not be less than 1 y after steel slag was crushed and stored.The volume stability could be controlled by the conversion rate smaller than 5％under autoclave test.Sprinkling water and moisturing should be performed on fresh steel slag to promote the hydration of free calcium oxide.The volume stability of steel slag asphalt concrete should he controlled by volume expansion rate less than 1.5％under 60℃ water immersion for 7 d.After effective aging treatment,the volume expansion had slight effects on the long-term water stability and service performance of asphalt concrete,which could not result in premature water damage and structure unstability.
万方数据
维普
