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Early Hardening Behavior of Natural Hydraulic Lime Paste by Multiple Light Scattering Analysis

Multiple Light Scattering 분석법을 이용한 천연수경성석회의 초기경화 거동

  • Moon, Ki-Yeon (Korea Institute of Limestone and Advanced Materials) ;
  • Cho, Kye-Hong (Korea Institute of Limestone and Advanced Materials) ;
  • Cho, Jin-Sang (Korea Institute of Limestone and Advanced Materials) ;
  • Hong, Chang-Woo (Department of Civil Engineering, Korea National University of Transportation)
  • 문기연 (한국석회석신소재연구소 연구개발실) ;
  • 조계홍 (한국석회석신소재연구소 연구개발실) ;
  • 조진상 (한국석회석신소재연구소 연구개발실) ;
  • 홍창우 (한국교통대학교 토목공학과)
  • Received : 2016.12.09
  • Accepted : 2017.02.02
  • Published : 2017.02.28

Abstract

In the present study, the multiple light scattering method was used for analysis of early hardening behavior of natural hydraulic lime (NHL) containing inorganic additives. In order to improve the properties of self-manufactured NHL, blast furnace slag and three types of gypsum were mixed with mixing ratio, and a water/solid ratio of fresh NHL paste was fixed 0.6. The fresh pastes in flat-bottomed cylindrical glass tubes were placed in the instrument. The backscattering flux (BS) of light from fresh pastes was then periodically measured at 10 minutes intervals the entire length of the sample (55mm) at $23^{\circ}C$ for 24 hours. The rate of increase of BS, slope of a linear equation to the mean value of BS (%) as a function of hydration time, was increased from 0.02 to 0.38 BS %/hour due to addition of blast furnace slag and gypsum. In the case of addition of hemi-hydrate, BS (%) and rate of increase in BS were highest.

본 연구에서는 무기질 첨가재를 혼합한 천연수경성석회의 초기경화 거동분석을 위해 multiple light scattering 분석법을 이용하였다. 자체 제조한 천연수경성석회의 물성향상을 위해 고로수쇄슬래그 및 3종류의 석고를 혼합비에 따라 혼합하였으며 물-고체비 0.6으로 페이스트를 제조하였다. 제조한 페이스트를 이용하여 원통형의 용기에 일정량을 담아 장비(Turbiscan LAB, Formulaction)에 장입하여 분석을 실시하였다. 페이스트로부터의 backscattering flux(BS, %)는 $23^{\circ}C$의 온도에서 분석용기 전체높이(55 mm)에 대해 24시간 동안 10분 간격으로 측정되었다. 모든 시료에서 전체적으로 BS는 시간경과에 따라서 증가하는 경향성을 보였다. 고로수쇄슬래그와 석고를 첨가함에 따라서 시간에 따른 BS의 증가 속도는 0.02에서 0.38 BS %/hour 까지 증가하였다. 반수석고를 혼합하였을 경우 가장 높은 backscattering flux와 BS의 증가속도를 보였다.

Keywords

References

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