DOI QR코드

DOI QR Code

Feasibility Analysis of Wasted Limestone Powder as a Viscosity Reducing Material for Cement Based Materials

시멘트 계열 재료의 점도 저하용 혼화재료로서 폐석회석 미분말의 사용 가능성 분석

  • Lee, Hyang-Seon (Department of Architectural Engineering, Engineering Research Institute, Gyeongsang National University) ;
  • Jeon, Jong-Un (Department of Architectural Engineering, Engineering Research Institute, Gyeongsang National University) ;
  • Son, Bae-Geun (Department of Architectural Engineering, Engineering Research Institute, Gyeongsang National University) ;
  • Han, Dongyeop (Department of Architectural Engineering, Engineering Research Institute, Gyeongsang National University)
  • 이향선 (경상대학교 건축도시토목공학부) ;
  • 전종운 (경상대학교 건축도시토목공학부) ;
  • 손배근 (경상대학교 건축도시토목공학부) ;
  • 한동엽 (경상대학교 건축도시토목공학부)
  • Received : 2018.05.30
  • Accepted : 2018.06.22
  • Published : 2018.06.30

Abstract

The aim of the research is providing a fundamental idea of reducing viscosity of cement based materials by replacing powder based material. With developing concrete technology, high performance concrete with high solid volume fraction has been used widely. Under the conditions of the high solid volume fraction due to the low w/c and replacement of SCMs, decreased fluidity is one of the critical problem, and thus plasticizer has been used to improve fluidity of the mixture. However, in rheological aspect, the fluidity of cement based materials can be defined with yield stress and viscosity, and using plasticizer only decreases yield stress without least controlling on viscosity. Therefore, based on the idea of Krieger-Dougherty model, a feasibility of wasted limestone powder from cement manufacturing process was used to decrease the viscosity of the mixture by replacing cement powder. According to a series of experiment, by replacing wasted limestone powder solely, there was a possibility of reducing viscosity was observed. Thus, in this research scope, it is considered to contribute on providing a fundamental idea of reducing viscosity with powder replacement and it is expected to contribute on further research using various conditions of replacing powders for reducing viscosity of cementitious materials.

본 연구의 목적은 고강도 및 일반강도 영역의 물-결합재 비에 대해 시멘트계열 재료의 점도를 감소시키기는 것에 대한 정보를 제공하는 것이다. 시멘트 계열 재료의 유동성을 결정하는 것은 물-결합재 비 및 치환재료와 감수제가 있다. 이를 레올로지적으로 보았을 때 물-결합재 비가 낮은 경우 항복치와 점도를 낮추며 감수제의 경우 항복치 저감에 영향을 주지만 점도 저하에는 한계가 있다. 따라서 이 연구에서는 시멘트 계열 재료의 점도를 낮추기 위해 물-결합재 비에 따른 폐석회석 치환에 대한 점도 저하 가능성을 분석하였다. 실험 결과, 폐석회석을 치환하였을 경우 점도 저하의 효과가 있었으며 이는 시멘트 계열 재료의 점도 제어에 유의미한 결과를 주는 것으로 판단되었다. 따라서 본 연구의 결과는 시멘트 계열 재료의 점도를 낮추는 방안으로써 분체 치환에 의한 방안의 기초적인 자료가 될 것으로 생각된다.

Keywords

References

  1. Han, C.G., Heo, Y.S. (2005). Mineral admixture factors affecting rheological properties of cement paste, Journal of the Korea Institute of Building Construction, 5(2), 57-61 [in Korean].
  2. Kim, W.J., Cho, C.G. (2008). "Experiment on rheological and flow characteristics of flowable concrete varying with SP and W/C ratio," Proceeding of Annual Conference of the Architectural institute of Korea, 571-574 [in Korean].
  3. Krieger, I.M., Dougherty, T.J. (1959). A mechanism for non‐newtonian flow in suspensions of rigid spheres, Transactions of the Society of Rheology, 3(1), 137-52. https://doi.org/10.1122/1.548848
  4. Lee, J.I., Lee, S.H. (2011). Rheological properties of limestone blended cement paste, Journal of the Korea Concrete Institute, 23(1), 481-482 [in Korean].
  5. Sidney, M., Youg, J.F. (2008b). Concrete Second Edition: Fresh State Concrete, 214-234.
  6. Sidney, M., Youg, J.F. (2008a). Concrete Second Edition: Fresh State Concrete, 566-583.
  7. Wallevik, O.H., Jon, E.W. (2011). Rheology as a tool in concrete science: the use of rheographs and workability boxes, Cement and Concrete Research, 41(12), 1279-1288. https://doi.org/10.1016/j.cemconres.2011.01.009