Research on Water Stability of Steel Slag Asphalt Mixture

Abstract

Abstract: In order to study the volume stability and road performance characteristics of steel slag asphalt mixture at different water immersion time,rutting test,low temperature bending test,freeze-thaw splitting test,water immersion Marshall test,fatigue test and expansion test were carried out on hot stuffy steel slag asphalt mixture,cold abandoned steel slag asphalt mixture and limestone asphalt mixture respectively.The atomic force microscope was used to analyze the influence mechanism of water on the road performance of steel slag asphalt mixture.The results show that the high temperature stability,water stability,low temperature performance and fatigue performance of the steel slag asphalt mixture with qualified expansion are better than limestone asphalt mixture,in which the dynamic stability and residual stability of the steel slag asphalt mixture have growth.Using limestone fine aggregates instead of cold abandoned steel slag fine aggregates can improve the low temperature performance of cold abandoned steel slag asphalt mixtures.The crystalline material generated by the steel slag under the action of water immersion increases the surface area and surface roughness of the steel slag.The effect of water immersion improves the internal grinding resistance and cohesive force of the steel slag asphalt mixture,thereby improving the dynamic stability and residual stability.

Key words: steel slag asphalt mixture, road performance, volume stability, water stability, mechanism of action, soaking time

CLC Number:

U416.217

ZHANG Caili, WANG Chao, LI Song, DING Weizhe, TANG Xiuming. Research on Water Stability of Steel Slag Asphalt Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 207-214.

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