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A study of semi-quantification of the Friedel's salt using the X-ray diffraction method in concrete

콘크리트 내 Friedel염의 XRD를 이용한 반정량적 측정기법에 관한 연구

  • Lee, Ho-Jae (Structural Engineering Research Division, SOC Research Institute, Korea Institute of Construction Technology) ;
  • Lee, Jang-Hwa (Structural Engineering Research Division, SOC Research Institute, Korea Institute of Construction Technology) ;
  • Kim, Do-Gyeum (Structural Engineering Research Division, SOC Research Institute, Korea Institute of Construction Technology)
  • 이호재 (한국건설기술연구원, SOC성능연구소, 인프라구조연구실) ;
  • 이장화 (한국건설기술연구원, SOC성능연구소, 인프라구조연구실) ;
  • 김도겸 (한국건설기술연구원, SOC성능연구소, 인프라구조연구실)
  • Received : 2011.09.20
  • Accepted : 2011.12.30
  • Published : 2012.02.25

Abstract

Despite the importance of chloride binding, it is very difficult to measure the binding capacity, in particular, for the concrete body in an existing structure: in fact, the measurement procedure for chloride binding is much influenced by the environmental condition such as temperature, fineness of sample and pore water extraction techniques. The present study concerns the quantification of the binding capacity of chloride ions in concrete using the X-ray diffraction (XRD) technique. Once the binding isotherm of chlorides was determined by the Langmuir isotherm, as a function of the W/C, curing age and binder type, the generation of bound chlorides (i.e. Friedel's salt) was simultaneously ensured by the XRD technique. The amount of bound chloride was then determined by analyzing the peak intensity for the bound chlorides in the XRD curve. It was found that an increase in the curing age and a decrease in the W/C resulted in an increase in the binding capacity.

염화물 고정화능력의 중요성에도 불구하고 고정화능력을 측정하는 것은 어려우며 특히, 이미 건설되어 공용중인 구조물에서는 더욱 어렵다. 실제로 고정염화물을 측정하는 과정은 온도, 시료의 분말도, 공극수 추출기법 등과 같은 환경적 요인에 의해 큰 영향을 받는다. 본 연구에서는 X-선 회절분석법(XRD; X-ray diffraction)을 이용하여 콘크리트 내 염화물 이온의 고정화능력을 정량화하는 방법에 대해 중점을 두고 연구를 진행하였다. 염화물의 고정능력 isotherm은 물/시멘트비, 양생기간, 결합재 종류에 영향을 받으며 Langmuir isotherm 을 통하여 일단 결정된 고정염화물(Friedel 염)은 XRD를 이용하여 동시에 분석을 진행한다. XRD 그래프에서 나타난 고정염화물량의 피크 강도와 측정된 고정염화물의 총량의 관계를 결정한다. 결과적으로 양생기간이 증가될수록, 물/시멘트비가 감소될수록 고정화 능력은 증가하였다.

Keywords

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