Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Carbon Dioxide-reduced Cement on Properties of Lightweight-foamed Concrete

이산화탄소 저감형 시멘트 함량에 따른 경량기포 콘크리트의 물성평가

  • Im, Donghyeok (Department of Polymer Engineering Pukyong National University) ;
  • Lee, Won-Ki (Department of Polymer Engineering Pukyong National University)
  • 임동혁 (부경대학교 고분자공학과) ;
  • 이원기 (부경대학교 고분자공학과)
  • Received : 2020.02.27
  • Accepted : 2020.05.11
  • Published : 2020.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

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℃ ; 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.

Keywords

References

  1. Baek, B. H., Han, C. G., 2015, Improving quality of eco-mortar incorporating blast furnace slag and recycled aggregate depending on replacement gypsum and cement, Korea Inst. Build Const., 15(2), 193-199. https://doi.org/10.5345/JKIBC.2015.15.2.193
  2. Cho, Y. K., Kim, C. S., Nam, S. Y., Cho, S. H., Lee, H. W., Ahn, J. W., 2019, Characterization of foamed concrete using calcium sulfaluminate, Journal of Energy Engineering, 28(1), 10-16. https://doi.org/10.5855/ENERGY.2019.28.1.010
  3. Cho, Y. K., Nam, S. Y., Kim, C. S., Cho, S. H., Lee, H. W., Ahn, J. W., 2019, Characterization of shrinkage reducing type cement carbon dioxide-reducible CSA synthesis, Journal of Energy Engineering, 28(1), 17-21. https://doi.org/10.5855/ENERGY.2019.28.1.017
  4. Esmaily, H., Nuranian, H., 2012, Non-autoclaved high strength cellular concrete from alkali-activated slag, Construction and Building Materials, 26(1), 200-206. https://doi.org/10.1016/j.conbuildmat.2011.06.010
  5. Jeun, J. Y., Song, J. T., 2000, Synthesis and properties of calcium sulfoaluminate type expansive, Journal of the Korean Ceramic Society, 37(4), 388-394.
  6. Joo, M. K., Lho, B. C., 2015, Evaluation of properties of polymer-modified mortar with CSA, Journal of the Korea Institute for Structural Maintenance and Inspection, 19(1), 35-44. https://doi.org/10.11112/jksmi.2015.19.1.035
  7. Kim, H. S., Lee, S. H., Sun, J. S., Kim, J. M., 2016, A Physical properties of lightweight foamed concrete according to lightweight aggregate types and foaming agent types, Journal of the Korea Concrete Institute, 28(4), 435-444. https://doi.org/10.4334/JKCI.2016.28.4.435
  8. Kim, J. M., Cho, S. H., Lee, D. K., 2001, High strengthening mechanism by blast furnace slag in concrete based products, Clean Technology, 7(2), 109-117.
  9. Kim, S. C., Ahn, S. K., 2009, Mix design and characteristics of compressive strengths for foam concrete associated with application of bottom ash, Journal of the Korea Concrete Institute, 21(3), 283-290. https://doi.org/10.4334/JKCI.2009.21.3.283
  10. Lee, D. H., Jun, M. K., Ko, J. S., 2001, Physical properties and quality control of foamed concrete wite fly ash for cast-in-site, Journal of the Korea Concrete Institute, 61(1), 69-76.
  11. Lee, K. H., Yang, K. H., 2015, Effect of fiber addition for improving the properties of lightweight foamed concrete, J. Korea Inst. Build Const., 15(4), 383-389. https://doi.org/10.5345/JKIBC.2015.15.4.383
  12. Lee, K. I., Mun, J. H., Park, Y. S., Yang, K. H., 2019, A Fundamental study to develop low-$CO_2$.high-insulation lightweight concrete using bottom ash aggregates and air foam, Journal of the Korea Concrete Institute, 31(3), 221-228. https://doi.org/10.4334/JKCI.2019.31.3.221
  13. Lee, S. H., 2002, Effect of foaming agent on the continuous voids in lightweight cellular concrete, Journal of the Korea Concrete Institute, 14(5), 742-749. https://doi.org/10.4334/JKCI.2002.14.5.742
  14. Palglia, C., Wombacher, F., Bohni, H., 2001, The influence of alkali-free and alkaline shotcrete accelerators within cement systems: I. Characterization of the setting behavior, Cement & Concrete Research, 31(6), 913-918. https://doi.org/10.1016/S0008-8846(01)00509-9
  15. Seo, W. C., Kim, S. H., KO, S. J., Kim, S. H., Jo, K. Y., 2008, The synthesis and hydraulic properties of Calcium Sulfo Aluminate(CSA) derived from secondary refining slag, J. Kor. Inst. Met & Mater, 46, 437-442.
  16. Yoon, H. S., Yang, K. H., 2019, Optimum mixture proportioning of autoclave lightweight aerated concrete considering required foaming rate and compressive strength, Journal of the Korea Concrete Institute, 31(2), 123-130. https://doi.org/10.4334/JKCI.2019.31.2.123