• Journal of the Korean Geosynthetics Society
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• v.16 no.2
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• pp.149-158
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• 2017

Permeating injection is commonly known as an ideal type of injection in grouting reservoir embankment, yet often-combined permeating and fracturing injection grouting operation can disturb the original soil. A grouting method has been regarded as effective and developed to ameliorate the possible disturbance problem. It involves compaction grouting with low expansive pressure near the injection hole and repetitive injection and compaction with grout material that allows ideal permeating injection. This thesis develops Hybrid Grout (ie. HG grout) that allows various application in any ground condition combined together, has high fineness and low viscosity, and expands permeation injection to silty sand. It researches on the injection effect of permeable compaction grout which is done with PC packer and is a combination of HG grout and expansion agent to obtain permeation compaction effect on the area near grout injection spot by developing Permeable Compaction Type Packer(ie. PC packer). As the developed PC packer, HG grout, and and expansion agent (HI-E) are applied to reservoir embankment reinforcement grouting, possibile permeation compaction effect that satisfies reservoir embankment grouting standard is confirmed according to the research.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.1
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• pp.111-116
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• 2010

The treatment of heavy metal, in the waste ash from incinerator and mine solid waste, by using alkali-soluble acrylic copolymer emulsion, that is effective in the absorption of heavy metal has been studied. It seemed that alkali soluble acrylic copolymer emulsion was very effective in the absorption of Hg, Pb, Cd and Cu in this test. Also, eco-friendly thixotropic grout, using alkali soluble acrylic copolymer emulsion, that is effective in the absorption of heavy metal, for the recycling of waste ash from incinerator and mine solid waste has been tested. It was observed that waste ash could be used as a raw material of eco-friendly thixotropic grout mortar due to the effectiveness of alkali soluble acrylic copolymer emulsion in the fixation of heavy metals including $Cr^{6+}$ from waste ash in this test.

• Journal of environmental and Sanitary engineering
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• v.16 no.4
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• pp.31-37
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• 2001

Deicers have used for melting snow on the road during winter season, but they have largely influenced on environment and public assets and human health. The pollution level of snow and soil contained deicer was analyzed and evaluated the characteristics of deicers. The results were as follows 1. In the result of measurement of pollutants in snow contained deicer, the pH was a little higher than a comparative group and the concentration of $Cl^{-}$ ranged from 0.5% to 0.87%, and the electric conductivity ranged 12.4 to 24.6 mmho/cm. The concentration of Cd, As, and Hg was not detected, but those of Cu, Pb, Cr was higher than a comparative group. 2. In soil of the road spreaded with deicer, the pH is getting alkalized and the concentration of $Cl^{-}$ was high in January and returned the level of a comparative grout) in November by physical and chemical reaction with deicer, but the concentration of heavy metals were not connected with deicers. 3. In comparison of deicing efficiency, the concentration of $Cl^{-}$ was 3.3~5times high in spreading with deicer before snowing than after snowing. The concentration of $Cl^{-}$ in NaCl was higher than $CaCl_2$, but the deicing efficiency of Nacl was better than that of $CaCl_2$. Moreover, the new deicer have no salt, but deicing efficiency of new deicer was less than that of NaCl and $CaCl_2$.