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Title |
The Density and Strength Properties of Lightweight Foamed Concrete Using Stone-Powder Sludge in Hydrothermal Reation Condition
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Keywords |
석분 슬러지 ; 경량 기포 콘크리트 ; 수열반응 ; 토버모라이트 |
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Abstract |
The Stone Powder Sludge(below SPS) is the by-product from the process that translates stone power of 8mm under as crushed fine aggregate. It is the sludge as like cake that has average particle size of 7㎛, absorbing water content of 20 to 60%, and SiO₂ content of 60% over. Because of high water content of SPS, it is not only difficult to handle, transport, and recycle, but also makes worse the economical efficiency due to high energy consuming to drying. This study is aim to recycle SPS as it is without drying. Target product is the lightweight foamed concrete that is made from the slurry mixed with pulverized mineral compounds and foams through hydro-thermal reaction of CaO and SiO₂ . Although in the commercial lightweight foamed concrete CaO source is the cement and SiO₂ source is high purity silica powder with SiO₂ of 90%, we tried to use the SPS as SiO₂ source. From the experiments with factors such as foam addition rate and replacement proportion of SPS, we find that the lightweight foamed concrete with SPS shows the same trends as the density and strength of lightweight foamed concrete increases according to decrease of foam addition rate. But in the same condition, the lightweight foamed concrete with SPS is superior strength and density to that with high purity silica. This trends is distinguished according to increase of replacement proportion of SPS, also the analysis of XRF shows that the hydro thermal reaction translates SPS to tobermorite. Although SPS has low SiO₂ contents, the lightweight foamed concrete with SPS has superior strength and density, because it reacts well with CaO due to extremely fine particles. We conclude that it is possible to replace the high purity silica as SPS in the lightweight foamed concrete experimentally.
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