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.

Abstract
1. 서 론
2. 실험재료 및 방법
    2.1. 실험재료
    2.2. 실험방법 및 분석방법
3. 결과 및 토론
    3.1. 경량기포 콘크리트의 유동성
    3.2. 경량기포 콘크리트의 압축강도 및 겉보기 밀도
    3.3. 경량기포 콘크리트의 열전도율
    3.4. 경량기포 콘크리트의 침하깊이
    3.5. 경량기포 콘크리트의 길이 변화율 측정
4. 결 론
REFERENCES

• 임동혁(부경대학교 고분자공학과) | Donghyeok Im (Department of Polymer Engineering Pukyong National University)
• 이원기(부경대학교 고분자공학과) | Won-Ki Lee (Department of Polymer Engineering Pukyong National University) Corresponding author