Abstract
To make steel slag being reasonably used in geotechnical backfilling projects or soft foundation treatment projects, three kinds of steel slag such as fine, coarse, and gravel steel slag were studied through particle analysis tests, relative density tests, and specific gravity tests to obtain basic physical parameters. Considering the influence of relative density, gradation, and other factors, constant head permeability tests of pure steel slag and variable head permeability tests of modified silt soil with different mixing contents of steel slag were carried out to test permeability coefficients under various working conditions. Prediction formulas on the permeability coefficients of the three kinds of pure steel slag and steel slag-treated silt soil were, respectively, deduced. It was concluded that the permeability coefficient of pure steel slag was greatly influenced by particle size and relative density, similar to the case of permeability coefficients of fly ash and fine sand in their dense states, and the larger the relative density was, the smaller the permeability coefficient was. The permeability coefficient of steel slag-treated silt soil increased with increasing of mixing content of steel slag, showing that steel slag can obviously improve the permeability performance of silt soil. Research results provide reference for design and construction on the application of steel slag in roadbed backfill, steel slag modifying silt soil, and other projects.
Highlights
Advances in Civil Engineering important factor affecting the permeability coefficient of soils [6]. e permeability characteristics of fly ash added by loess has been studied, and people proposed that the permeability coefficient of fly ash can be reduced by adding different proportions of loess [7]
Large accumulation of waste steel slag occupies a large amount of land and pollutes the environment and affects the sustainable development of society. e longterm performance of secondary materials is becoming a challenging aspect in road construction since their future behaviour is difficult to be estimated. e use of four kinds of recycled industrial solid waste materials was summed up in asphalt pavements in England, including waste steel slag and waste tires [10]. e sustainability of reusing industrial wastes including waste steel slag and waste tires as energy source was analyzed by Tsai [11] in the industrial sector of Taiwan
Calculation Method. e permeability coefficient of steel slag was calculated according to the following formula
Summary
Erefore, maximum and minimum dry densities of the three kinds of steel slag need to be measured through tests, and the relative density could be calculated by using the following formula: Dr ρd − ρdminρdmax, ρdmax − ρdminρd (1). E specific gravity of gravel steel slag was smaller than that of coarse and fine steel slag, but it was greater than that of conventional soil such as sand It was concluded that the specific gravity of the three kinds of steel slag were all larger than that of conventional soils, and the specific gravity of fine steel slag and coarse steel slag was similar. e specific gravity of gravel steel slag was smaller than that of coarse and fine steel slag, but it was greater than that of conventional soil such as sand
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