Characteristics and water permeability of pervious materials made from electric arc furnace steel slag
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Abstract
A pervious material is a concrete-based perforated material that can effectively drain water according to its porous structure. The outstanding features of the structure include a large fraction of open and connected pores, allowing good water permeability. This research focused on the use of electric arc furnace (EAF) slag waste from the steel industry as a raw material to produce pervious concrete. This aimed to observe the relationship between properties and microstructure of the slag-based porous bodies, i.e. compressive strength, water permeability and porosity. The cast specimens were prepared as slag-cement mixtures containing 2 different median sizes of the crushed EAF slag, the particle sizes of which were 5-12 mm (M) and 12-20 mm (L). The mixtures with various EAF slag size, L:M ratio of 100:0, 75:25, 50:50, 25:75 and 0:100 by weight, were blended with ordinary Portland cement and water. After demolding and water curing for 1 day, the as-cast were further cured for 3, 7, 14 and 28 days. Compressive strength, density, porosity and water permeability were determined. The experimental results showed that the compressive strength was greater as a function of curing time. The change in EAF slag size ratio significantly affected the strength. Strength and water permeability were truly related to pore characteristics. The water flow rate might not be solely based on pore fraction in the bodies but also depended on the connectivity and the size of the pore. Therefore, the next step of the research should cover the connectivity of pore structure.
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