Abstract
In order to reduce stormwater runoff, permeable brick was prepared by compounding with fly ash and steel slag as the main substrate. The study found that the amount of steel slag has a significant influence on the compressive strength of permeable brick. When the proportion of steel slag is 6.5%, the compressive strength of permeable brick after 28 days curing can reach 26.32 MPa. The strength of permeable brick decreases with the increase of fly ash content, but the permeability coefficient increases significantly. The results show that the compressive strength and permeability coefficient of permeable bricks can reach a good level when the composite ratio of steel slag is 6%, fly ash is 30%, and the design target of porosity is 20%.
Highlights
In recent years, the rapid urbanization has led to a large area of urban surface covered by impervious materials such as concrete, resulting in a significant increase in surface rainwater runoff, which aggravates the pollutant load of the receiving water body, and makes urban flood control and urban stormwater management face more severe challenges [1,2]
Existing studies found that steel slag and fly ash have a significant removal effect on phosphorus in wastewater [5]
This kind of industrial waste residue can be mixed into permeable brick by certain technical means and used for urban pavement or riverbank paving, which can reduce rainwater runoff and reduce phosphorus pollution, and recycle industrial waste [6,7,8]
Summary
The rapid urbanization has led to a large area of urban surface covered by impervious materials such as concrete, resulting in a significant increase in surface rainwater runoff, which aggravates the pollutant load of the receiving water body, and makes urban flood control and urban stormwater management face more severe challenges [1,2]. China, as an industrial power, has a large output of steel slag and fly ash. It has been applied in the fields such as building materials, its second utilization rate is still at a low level [3,4]. Existing studies found that steel slag and fly ash have a significant removal effect on phosphorus in wastewater [5] This kind of industrial waste residue can be mixed into permeable brick by certain technical means and used for urban pavement or riverbank paving, which can reduce rainwater runoff and reduce phosphorus pollution, and recycle industrial waste [6,7,8]. The intensive research on the compressive strength and water permeability coefficient of the permeable brick after forming was carried out with reference to the relevant ASTM standards and regulations
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