改性钢渣-沥青混合料的性能及机理

doi:10.11896/cldb.22100041

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Abstract The steel slag was soaked and modified using sodium methyl silicate solution, silica colloidal solution, and polyacrylate emulsion. The physical and mechanical properties of modified steel slag, the properties of modified steel slag-asphalt mixture, the modification mechanism of steel slag and the crack resistance of modified steel slag-asphalt mixture were investigated by property testing, scanning electron microscope (SEM), acoustic emission and other test methods. The physical properties of 4.75—19 mm steel slag were improved after modification by 1%—4% concentration of solvent. The volume stability of modified steel slag-asphalt mixes prepared from modified steel slag with 3% solvent concentration increased by 27.92% to 39.09% compared to unmodified steel slag-asphalt mixes (RSAM). Modified steel slag surface wrapped with different states of insoluble modified protective layer, the surface of the modified steel slag (SMS) showed a dense layered structure and kept the surface rough, and the modification effect was the best. The crack width of silica modified steel slag-asphalt mixture (SMSAM) was reduced and the main crack appeared later, SMS played a role in slowing down the fracture damage of SMSAM and improved the cracking resistance of the mixture.

Key words： modified steel slag modified steel slag-asphalt mixture property modification mechanism cracking resistance mechanism

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TU522.3

Fund:National Key Research and Development Program of China (2021YFC1910605),the Natural Science Foundation of Hebei Province (E2020402079), Hebei Province and Technology Major Special Project(21283804Z), State Key Laboratory of Solid Waste Resource Utilization and Energy Conservation (SWR-2023-007),Science and Technology Research and Development Plan of China Railway Construction Group Co.,Ltd.(22-14b,22-11b),and Handan Science and Technology Research and Development Program (21422111260).

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	GAO Ying
	CHEN Meng
	WANG Changlong

Cite this article:

GAO Ying,CHEN Meng,WANG Changlong. Properties and Mechanism of Modified Steel Slag-Asphalt Mixture[J]. Materials Reports, 2024, 38(2): 22100041-7.

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https://www.mater-rep.com/EN/10.11896/cldb.22100041 OR https://www.mater-rep.com/EN/Y2024/V38/I2/22100041

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