Abstract
In the present study, a porous concrete with alkali activated slag (AAS) and coal bottom ash was developed and the effect of carbonation on the physical property, microstructural characteristic, and heavy metal leaching behavior of the porous concrete were investigated. Independent variables, such as the type of the alkali activator and binder, the amount of paste, and CO2 concentration, were considered. The experimental test results showed that the measured void ratio and compressive strength of the carbonated porous concrete exceeded minimum level stated in ACI 522 for general porous concrete. A new quantitative TG analysis for evaluating CO2 uptake in AAS was proposed, and the result showed that the CO2 uptake in AAS paste was approximately twice as high as that in OPC paste. The leached concentrations of heavy metals from carbonated porous concrete were below the relevant environmental criteria.
Highlights
Porous concrete is defined as a type of concrete with continuous open voids (Sriravindrarajah et al 2012)
Since carbonation is known to induce the change in physicochemical properties of activated slag (AAS) and the change in the leaching behavior of heavy metal from bottom ash (BA), the present study aims to investigate the effect of carbonation on heavy metal leaching, mechanical property and CO2 uptake of porous concrete through a series of characterization tests
The extent of the carbonation in the Ordinary Portland cement (OPC) paste (PC(P)_C5) at a 5 % CO2 concentration was slight, and the carbonation depth was no greater than 3 mm at all sides
Summary
Porous concrete is defined as a type of concrete with continuous open voids (Sriravindrarajah et al 2012). Since carbonation is known to induce the change in physicochemical properties of AAS and the change in the leaching behavior of heavy metal from BA, the present study aims to investigate the effect of carbonation on heavy metal leaching, mechanical property and CO2 uptake of porous concrete through a series of characterization tests. Independent variables, such as the type of the alkali activator and binder, the amount of paste, and CO2 concentration, were considered
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