Interlayer Shear Performance of Steel SlagAsphalt Mixture Thin Overlay

Abstract

Abstract: In order to explore the shear failure mechanism between thin overlay of steel slag asphalt mixture, a gap graded steel slag thin asphalt overlay and dense graded surface layers with different texture depth were designed. The effects of texture depth, temperature, styrene-butadiene rubber modified emulsified asphalt dosage and stress ratio on shear performance between thin layers of steel slag were studied. Marshall stability test, freeze-thaw splitting test and dynamic stability test were used to evaluate the road performance of asphalt mixture. Direct shear test and shear fatigue test were used to evaluate the interlayer shear performance between thin overlay and surface layers. The results show that the crushing value and abrasion of steel slag aggregate are obviously lower than those of limestone aggregate, and the adhesion of steel slag/asphalt is much better than that of limestone/asphalt, which makes the pavement performance of steel slag asphalt mixture excellent. Interlayer shear strength is mainly controlled by test temperature. At the same temperature, the interlayer contact state between the surface layer and the thin overlay is improved with increase of tack coat application rate, the shear strength is improved. However, excessive tack coat forms slip layer between the surface layer and the thin overlay, which weakened the influence of the texture depth on interlayer shear strength. Through shear fatigue test, the shear fatigue life of thin overlay decreases with the increase of stress ratio. The fatigue life equation is obtained by shear fatigue test.

Key words: steel slag asphalt mixture, thin overlay, road maintenance, texture depth, SBR modified emulsified asphalt dosage, shear strength, interlaminar shear fatigue

CLC Number:

U416.25

LUO Cheng, YAN Feng, XIA Haiting, LU Kaiyu, ZHOU Bin, FENG Mingjie. Interlayer Shear Performance of Steel SlagAsphalt Mixture Thin Overlay[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4197-4208.

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