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2022 Vol.32, Issue 3 Preview Page

Research Article

Experimental Study of the Weight Increase of the Oven Dried Weathered Granite Soil due to Moisture Absorbed during Air Exposure

노건조된 화강풍화토의 공기 중 노출시 습윤무게 증가에 관한 실험적 연구

Suk-Joo Kim1*
김 석주1*
1Professor, Department of Civil Engineering, Gyeongbuk Provincial College
1경북도립대학교 토목공학과 교수
*Corresponding Author
30 September 2022. pp. 401-410
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Abstract

This work reports an oven drying test performed on weathered granite soil from Yecheon, Korea, in order to find an effective method for measuring the weight of pure soil particles. After samples were oven dried, weights measured following desiccation using the method specified by the Korean Industrial Standard (KS F) were compared with weights measured without prior desiccation. Soil samples exposed to air for 45 min after oven drying absorbed moisture from the air and gradually increased in weight. When a desiccator was used, results measured 30 s after exposure to air indicated weight increases of 0.103-0.735% (depending on the particle size of the soil) relative to equivalent samples measured without desiccation. Using a desiccator after oven drying leads to overestimation of the pure soil weight. Therefore, measuring the weight of a soil sample immediately after oven drying without using a desiccator can reduce the error of weight measurement.

Keywords
weathered granite soil
soil weight
humidity
drying oven
desiccator

본 연구에서는 순수한 흙입자의 무게를 측정하는 유효한 방법을 찾기 위하여 예천지역의 화강풍화토를 대상으로 노건조 시험을 수행하였다. 노건조 후 데시케이터를 사용하는 한국산업표준(KS F)에 규정된 방법과 데시케이터를 사용하지 않는 경우에 대하여 비교하였다. 노건조 후 45분간 공기 중에 노출된 흙시료는 공기 중에서 수분을 흡수하여 무게가 점진적으로 증가하였다. 공기 중에 노출 후 30초에 측정된 결과에서 데시케이터를 사용한 경우는 데시케이터를 사용하지 않은 경우에 비하여 흙의 입경에 따라 0.103~0.735%의 무게가 증가되었다. 노건조 후 데시케이터를 사용하면 순수한 흙무게를 과대평가하는 결과가 나타난다. 그러므로, 데시케이터의 사용 없이 노건조 후 시료의 무게를 곧바로 측정하면 흙무게의 측정오차를 감소시킬 수 있다.

키워드
화강풍화토
흙무게
습도
건조로
데시케이터
References
1
ASTM D2216-19, 2019, Standard test methods for laboratory determination of water (moisture) content of soil and rock by mass, ASTM International, West Conshohocken, PA, DOI:10.1520/D2216-19. 10.1520/D2216-19
2
KS F 2104, 2018, Standard test method of organic matter contents in soils by ignition loss (in Korean).
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KS F 2301, 2020, Practice for preparing disturbed soil samples for soil testing (in Korean).
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KS F 2302, 2017, Standard test method for particle size distribution of soils (in Korean).
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KS F 2306, 2020, Standard test method for water content of soils (in Korean).
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KS F 2308, 2022, Test method for density of soil particles (in Korean).
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KS F 2324, 2022, Unified soil classification system (in Korean).
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KS F 2341, 2017, Standard method for wet preparation of soil samples for particle size analysis and determination of soil constants (in Korean).
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Lee, S.K., Lee, T.J., 2010, A new suggested method for determining solid weight of rock samples by weight monitoring during drying process, Journal of the Korean Society of Mineral and Energy Resources Engineers, 47(2), 183-190 (in Korean with English abstract).
Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 32
  • No :3
  • Pages :401-410
  • Received Date : 2022-09-07
  • Revised Date : 2022-09-26
  • Accepted Date : 2022-09-27
  • DOI :https://doi.org/10.9720/kseg.2022.3.401
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