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A Study on the Measurement of Moisture Content in the Organic Soils

유기질토의 함수비 측정에 관한 연구

Sung-Sik Park1
,
Sun-Gyu Choi2
,
Ju-Hyung Ryu3
박 성식1
,
최 선규2
,
류 주형3
1Assistant Prof., Dept. of Civil Engrg., Kyungpook National Univ.
2Graduate Student, Dept. of Civil Engrg., Kyungpook National Univ.
3Graduate Student, Dept. of Civil Engrg., Kyungpook National Univ.
1경북대학교 공과대학 건축토목공학부 토목공학전공 조교수
2경북대학교 공과대학 건축토목공학부 박사과정
3경북대학교 공과대학 건축토목공학부 석사과정
교신저자. Corresponding Author. 
31 October 2013. pp. 5-17
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Abstract

Organic soils are widely distributed at Youngdong areas in Kangwon prefecture and Jeonbuk area. Such organic soils usually consist of undecomposed fiber materials. It is difficult to exactly measure the water content of such organic soils because some organic materials may decompose at 110℃ in drying oven. In this study, both drying oven and microwave oven methods are used to measure the water content of organic soils. Three different levels of oven temperature, 60℃, 80℃, and the standard temperature of 110℃, were used to measure the water content of organic soils in the 1st, 2nd, and 3rd day. The water content by microwave oven was measured for two different sample masses (30, 60 g) with five different measuring times (3, 6, 9, 12, 15 min.). As the temperature increased, the water content of organic soils increased due to the decomposition of organic materials in soils. The water content of some soils increased up to 2 times as the temperature was increased from 60℃ to 110℃. However, the water content was not changed after the 1st day, regardless of drying oven temperature and soil types. The water content by microwave oven became constant after 12 min. for the 30 g sample and 15 min. for the 60 g sample used. The measured water content by microwave oven was similar to that measured by drying oven at 60℃.

Keywords
Drying oven
Microwave oven
Organic soils
Water content

강원 영동지역이나 전북지역에는 유기질 함량이 높은 흙이 많이 분포하고 있다. 이와 같은 유기질토는 주로 미분해된 섬유질로 구성되어 있으므로 흙의 함수비를 측정하기 위하여 110℃의 건조로에 넣고 함수비를 측정할 경우 흙 속에 포함된 유기질 성분이 분해될 수 있기 때문에 정확한 함수비 측정이 어렵다. 따라서 본 연구에서는 건조로뿐 아니라 전자레인지를 이용하여 유기질토의 함수비 측정방법에 대하여 연구하였다. 국내에서 채취한 유기질 성분이 높은 흙뿐 아니라 모래, 실트, 카올리나이트와 같은 일반 흙도 실험하였다. 먼저 건조로의 온도를 표준 온도인 110℃를 포함하여 60℃ 또는 80℃로 설정하여 흙의 함수비를 1일, 2일 및 3일 후 각각 측정하였다. 또한, 전자레인지를 이용하여 시료의 무게(30g, 60g)와 측정시간(3, 5, 9, 12, 15분)을 달리하면서 흙의 함수비를 측정하였다. 유기질토의 경우 건조로의 온도가 높을수록 흙 속에 포함된 유기질 성분이 분해되면서 함수비는 증가하였으며, 일부 시료의 경우 60℃보다 110℃에서 최대 2배까지 증가하였다. 한편 건조로 측정시간에 따른 함수비 변화는 대부분 온도나 유기질 함량에 관계없이 1일 후 함수비 변화가 미미하였다. 전자레인지를 사용하여 흙의 함수비를 측정한 경우 시료의 양이 30g인 경우에는 12분 그리고 60g인 경우에는 15분 정도에서 함수비가 일정하게 수렴하였으며, 전자레인지를 이용하여 측정한 함수비는 건조로 60℃에서 측정한 함수비와 유사한 경향을 보였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :10
  • Pages :5-17
  • Received Date : 2013-07-08
  • Revised Date : 2013-08-29
  • Accepted Date : 2013-09-04
  • DOI :https://doi.org/10.7843/kgs.2013.29.10.29
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