Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
권호 표지
DOI QR코드

DOI QR Code

Development of Testing and Analysis Model for Evaluation of Absorbed Water Diffusion into Concrete

콘크리트 흡수 수분확산계수 산정을 위한 실험 및 수치해석 모델 개발

  • Park, Dong-Cheon (Department of Architecture and Ocean Space, College of Ocean Science and Technology, Korea Maritime University) ;
  • Ahn, Jae-Cheol (Department of Architecture and Ocean Space, College of Ocean Science and Technology, Korea Maritime University)
  • Received : 2011.04.25
  • Accepted : 2011.06.14
  • Published : 2011.08.20
Download PDF
⟨ Previous Next ⟩

Abstract

Concrete is affected by various deterioration factors, such as $CO_2$ and chloride ions from the sea, which cause carbonation and salt attack on concrete. These deterioration phenomena cause steel corrosion in RC structures. Although a great deal of research has been carried out in this area thus far, it is difficult to know the point at which corrosion will occur to a reinforced bar. As the diffusion of deterioration factors depends on the water content in concrete, it is imperative to assess the condition of absorbed water content. A mass measuring method was applied to calculate the absorbed water diffusion coefficient, as well as non-linear finite element method(FEM) analysis. As a result, it was found that W/C and unit water content in concrete mixture affect the diffusion coefficient decision.

콘크리트는 다공질로서 수분이 접하게 되면 시간경과에 따라 흡수가 일어난다. 다양한 배합의 콘크리트에서 어느 정도 수분 흡수가 빨리 일어나는가는 흡수수분 확산계수 산출을 통하여 가능하며, 본 연구에서는 길이가 다른 시험체의 질량 경시변화를 통하여 깊이별 흡수 수분량을 산출하였다. 흡수 수분 확산계수는 시간과 깊이의 함수로 이뤄진 볼츠만 변수를 사용하여 실험값과의 회귀분석을 통하여 구하였으며, 그 정확도는 비선형 유한요소 과도해석을 통하여 검증하였다.

Keywords

References

  1. Kim DH, Lim NG, Lee SB. The Study on Salt Injury and Carbonation of Reinforced-Concrete. Journal of the Korea Institute of Building Construction. 2002 June;2(2):165-74. https://doi.org/10.5345/JKIC.2002.2.2.165
  2. Yoon JH, Jaung JD. An Experimental Study on the Salt Damage Resistance of High Durable Concrete. Journal of the Korea Institute of Building Construction. 2003 Sept;3(3): 73-82. https://doi.org/10.5345/JKIC.2003.3.3.073
  3. Kwon YJ. An experimental study on the Carbonation and Drying Shrinkage of High Strength Concrete According to Kinds and Ratios of Mineral Admixtures. Journal of the Korea Institute of Building Construction. 2003 Sept;3(3): 127-34. https://doi.org/10.5345/JKIC.2003.3.3.127
  4. Park DC. Analytic Research about the Prediction of Long-term Neutralization Forced on the Reaction and Diffusion of Calcium Hydroxide. Journal of the Architectural Institute of Korea Structure & Construction. 2007 Aug;23(8): 99-106.
  5. Papadakis VG, Vayenas CG, Fardis MN. Physical and Chemical Characteristics Affection the Durability of Concrete. ACI Materials Journal. 1991 Feb;9(2):186-96.
  6. Anna V. Saetta, Roberto V. Scotta, Renato V. Vitaliani. Analysis of Chloride Diffusion into Partially Saturated Concrete. ACI Materials Journal. 1993 May;90(5):441-5.
  7. Philip JR. Numerical solution of equations of the diffusion type with diffusivity concentration-dependent. Transactions of the faraday society. 1955 Jul;391(7):885-92.
  8. Wang BZ, Fang ZH. Water absorption and measurement of the mass diffusivity in porous media. International Journal of Heat and Mass Transfer. 1988 Feb;31(2):251-7. https://doi.org/10.1016/0017-9310(88)90007-5
  9. Wang QG. Determination of the unsaturated hydraulic diffusivity of porous construction materials from transient moisture profiles utilizing pin-type resistance sensor array. Journal of Materials Science. 2005 Apr;40:1013-15. https://doi.org/10.1007/s10853-005-6522-3
  10. Benazzouk A, Douzane O, Queneudec M. Transport of fluids in cement-rubber composites. Cement & Concrete Composites. 2004 Jan;26:21-9. https://doi.org/10.1016/S0958-9465(02)00119-1
  11. Takeuchi H, Hara K, Nagano M. Water Retention Curve, Water Diffusivity and Water Movement of Compacted Bentonite. Journal of the Japanese Geotechnical Society. 1995 Mar;35(3):129-37.
  12. Yagawa G, Miyazaki N. [Thermal Stress, Creep, Heat Transfer Analysis by FEM & BEM]. 1st Edition. Tokyo (Japan); Saiensu sha Co. Ltd: 1991. 117 p. Japanese