EFFICIENT TREATMENT AND RESOURCE UTILIZATION OF URBAN SOLID WASTE MATERIALS |
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Effect of Steel Slag Content on Performance of Rubber Mixture ARAC-13 |
LIU Li1,2, ZHU Xiaoming1, LIU Zhaohui1,2,*, LI Wenbo1, YANG Chengcheng1, HUANG You1,2, LIU Leixin1
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1 School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China 2 National Engineering Research Center of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China |
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Abstract To improve the comprehensive utilization rate and economic benefit of steel slag and optimize the environment, the volume substitution method was used to design the composition of steel slag asphalt mixture. The volume stability of steel slag asphalt mixture was analyzed by designing a new method of expansion failure test. Through the rutting test, freeze-thaw splitting test, and low-temperature beam bending test, the road performance of ARAC-13 asphalt mixture with different steel slag contents was studied, and the economic benefits of steel slag asphalt mixture pavement were evaluated based on the Coastal Highway Project in Guangxi. The results showed that the volume relative density of the ARAC-13 asphalt mixture and the optimum asphalt content are both positively correlated with the steel slag content. The increase in steel slag content will reduce the volume stability of the mixture and increase the risk of volume expansion. When the steel slag replaces the coarse aggregate with 100% volume, the dynamic stability, residual stability, freeze-thaw splitting strength ratio, maximum flexural strain (-10 ℃), pendulum value, and structural depth of the ARAC-13 asphalt mixture are improved, to some varying degrees. A large amount of steel slag (100vol%) can not only significantly improve the road performance of ARAC-13 asphalt mixture, but also save about 7.0% of the material cost, which has great application prospects and economic value.
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Published: 25 May 2023
Online: 2023-05-23
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Fund:National Key Research and Development Project (2021YFB2601000), Natural Science Foundation of Hunan Province (2020JJ5578, 2022JJ40479), and Hunan Provincial Department of Education Natural Science Fund Excellent Youth Project (20B033, 21B0296). |
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