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KMID : 1024520200290060605
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Journal of the Environmental Sciences
2020 Volume.29 No. 6 p.605 ~ p.612
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Effect of Carbon Dioxide-reduced Cement on Properties of Lightweight-foamed Concrete
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Im Dong-Hyeok
Lee Won-Ki
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Abstract
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To improve the initial strength and stability of lightweight-foamed concrete, which shows suitable sound absorption and insulation characteristics, the effect of CO2-reduced cement on the properties of the concrete was investigated. Various mixing ratios were applied by substituting a certain amount of slag and Calcium Sulfo Aluminate (CSA) in CO2-reduced Ordinary Portland Cement (OPC) and the physical properties of the samples were examined using the Korean Standard. The kiln temperatures of the CSA were 100?200°C ; these values are lower than those of OPC and can lead to energy saving. In addition, the low limestone content reduces greenhouse gas emissions by 20 %. Adding a small amount of CSA in OPC content activates Ca-Al-H2-based hydrates, and the initial compressive strength of the concrete is improved. As the CSA content increased, the thermal conductivity of the concrete decreased by up to 8% compared to plain concrete, thus indicating an improvement in its insulation. Therefore, the settlement stability was improved as the addition of CSA shortened the setting time.
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KEYWORD
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Slag, Calcium sulfoaluminate, Portland cement, Settlement stability
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