• Title/Summary/Keyword: Fish poison test

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A Study on the Development and Characteristics of Eco-friendly None Alkaline Silica Sol Grouting Material (친환경 비알칼리성 실리카졸 지반주입재의 개발과 특성에 관한 연구)

  • Hyunsang Kang;Daeseouk Chung
    • Journal of the Society of Disaster Information
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    • v.19 no.4
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    • pp.747-756
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    • 2023
  • Purpose: In this study, a grout material mixed using non-alkaline silica-based materials, which is an eco-friendly injection material to stabilize ground, is investigated to improve conventional problems. Method: The homogel specimens of Eco-Friendly Non-Alkaline Silica Sol (ENASS) and L.W. and S.G.R., representative silicate grouting are manufactured. Physicochemical and engineering properties of the specimens are evaluated in laboratory with uniaxial compression strength, hydraulic conductivity, shrinkage, chemical resistance, elution, fish poison, waste leaching. Result: Laboratory test results show that the ENASS was superior in all aspects compared to the existing injection matirial. The suitability of the grout material with ENASS is investigated with filed tests. Conclusion: The results of laboratory and field tests demonstrates that the grout material with ENASS is eco-friendly material that increases the strength, decreases the permeability, and discharges pollutants without leaching.

Engineering Properties of Self-healing Smart Grouting Method (자기치유 기능을 이용하는 SSG공법의 공학적 특성)

  • Moon, In-Jong;Kim, Byoung-Il;Heo, June;Choi, Yong-Sung;Choi, Yong-Ki
    • Journal of the Korean Geotechnical Society
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    • v.32 no.3
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    • pp.29-37
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    • 2016
  • SSG (self-healing smart grouting) method, which is developed recently, has the characteristics such as an improvement of durability and waterproofing, prevention of leaching and pollution. In this study, we performed several tests such as gel-time measurement, uniaxial compression test, permeability test, fish poison test and chemical resistance test to compare the engineering properties of SSG with the other chemical grouting method (LW, SGR). As results of tests, the SSG method has low possibility of groundwater and ground pollution caused by leaching, furthermore, it has advantages like long/short term waterproofing, strength and durability. Therefore the SSG method can be applicable in the fields as an alternative of existing chemical grouting methods with problems.

An Experimental Study on Estimate of the Optimal Grout Injection Ratio for Stabilization of Mudstone fill (이암 성토지반의 안정화를 위한 최적주입률 산정에 관한 실험적 연구)

  • Lee, Jungsang;Lee, Seungjun;Kim, Yunjoong;Kim, Taesoo;Do, Jongnam;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.7
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    • pp.31-38
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    • 2012
  • Water glass chemical grouts are primarily used in ground injection projects. Natural and Durable Stabilizer (NDS), Space Grout Rocket (SGR), and other similar materials composing of inorganic accelerating agents with ultra fine cement have been gaining popularity as ground improvement material in South Korea. However, there are questions as to grouting results and environmental issues caused by NDS grout. This study uses the injection method in mudstone embarkment to evaluate the differences in strength, permeability, and optimum injection volume through the use of uniaxial and triaxial compression tests and fish poison tests for NDS and SGR materials. After 28 days, results showed SGR and NDS to have a 50% increase in strength and 50% decrease in permeability with the proper injection rate at 50%.

A Study on Seepage Cutoff Effect of the Environmentally Friendly SCM (SCM 친환경주입공법에 의한 차수 효과에 관한 연구)

  • Chun, Byung-Sik;Roh, Jong-Ryun;Jooi, Tae-Seong;Do, Jong-Nam
    • Journal of the Korean GEO-environmental Society
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    • v.6 no.4
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    • pp.65-71
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    • 2005
  • Recently, difficulties in soft ground improvement that caused by effectiveness of the ground improvement, the durability and environmentally friendliness of the injection material come to the fore. This paper studies the field applicability of the SCM in reinforcement and seepage cutoff of the back of an existing continuous wall. SCM uses double rod which imposes heavy pressure($10-100kgf/cm^2$) to disturbed, cut, discharge, and mix the ground. It is observed that a bulb is formed by using cement paste and environmentally friendly injection materials with minimal alkali leaching. Unconfined compression test and fish poison tests are performed. Test results indicate that the method results in higher durability, less leaching through use of the environmentally friendly injection material, and faster mobilization of the strength. In addition, field tests confirm the formation of the bulb and the seepage cutoff wall.

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Ecology and Extermination of the Bryozoa, Lophopodella carteri attached on the Net Cage in Freshwater (내수면(內水面) 가두리 망(網)에 착생(着生)하는 총담이끼벌레의(Bryozoa, Lophopodella carteri)의 생태(生態)와 구제(驅除)에 관(關)한 연구(硏究))

  • Kim, Young-Gill
    • Journal of fish pathology
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    • v.3 no.1
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    • pp.21-25
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    • 1990
  • In inland aquaculture, a lot of fishes often died cause of touch of L. carteri which is attached on the net cage. In this works, the experiment were carried out on classification of species, toxin test, and extermination with some chemicals. A bryozoa from net cage in lake Okjeong is classified into the Phylactolaemata, Lophopodella carteri Hyatt. A bryozoa broke out firstly on the 30th of June with water temperature up to $31^{\circ}C$ and it reattached on the net with water temperature below $30^{\circ}C$. Size of bryozoa colony is about $0.8{\times}0.6{\sim}1.7{\times}1.5cm$. Water column of attachment was 0~5m and the peak is 2~3m. In toxin test on the israeli carp, goldfish and catfish touched with bryozoa for 1 minute at $25^{\circ}C$ of water temperature, a dead fish appeared at 20 minutes after touched. Mortality was 90% for israeli carp and 100% for goldfish at 100 minuties after touched, but catfish was not died at all. It was supposed that the toxin is from nematocyst being around tentacles and this toxin act a deadly poison on a israeli carp and goldfish. In extermination test, the bryozoa treated with 300ppm of formalin, 5% of sodium chloride, 5ppm of malachite green, 200ppm of potassium permanganate, 1000ppm of potassium iodide, 10ppm of DDVP for minute respectively, all of them were not effected.

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