Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Applicability of Recycled Soil Mixed with Bentonite-Polymer for Waste Landfill Liner

순환토사의 벤토나이트-폴리머 혼합비에 따른 매립지 차수재 적용성에 관한 연구

  • Shin, Eun Chul (Dept. of Civil and Environmental Engineering, College of Urban Science, Incheon National Univ.) ;
  • Lee, Hee Mun (Dept. of Civil and Environmental Engineering, College of Urban Science, Incheon National Univ.)
  • Received : 2019.11.12
  • Accepted : 2019.11.20
  • Published : 2019.12.30
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Abstract

In this study, it was studied recycled soils with bentonite-polymer mixture in order to design economic landfill instead of clay liner. Recycled soil was used as SP, a sandy soil with 90.58% sand and 1.88% silt and clay. The recycled soils were mixed with 4%, 6%, and 8% bentonite by weight, and then compared with samples mixed with 2%, 3%, and 4% bentonite by weight in marine clay. Recycled soil satisfied the permeability criteria at 8%, and clay soil satisfied at 3%. In order to make a sample that satisfies the standard of the waste landfill, a permeability test was conducted by mixing 0.16%, 0.24%, and 0.28% of the polymer in a sample having 4% bentonite mixing ratio. The unconfined compression strength test was carried out at the same mixing ratio to confirm that the specification was satisfied. As the bentonite mixture ratio increased, the permeability coefficient and unconfined compression strength decreased. The strength in polymer mixing increased initially and then maintained a constant value. At 4% bentonite mixing ratio and 0.28% polymer mixing ratio, the coefficient of permeability was 1.0×10-7 cm/sec or less, and the unconfined compression strength was over 500 kPa. It was confirmed that it can be used as a mixed liner material of waste landfills.

이 연구에서는 경제적인 매립장 설계를 위해 점토차수재를 순환토사와 벤토나이트-폴리머 혼합 차수재로 활용하는 방안을 연구하였다. 순환토사는 모래가 90.58%이고 세립분이 1.88%이며 입도가 불량한 모래질 흙인 SP를 사용하였다. 순환토사는 벤토나이트를 4%, 6%, 8% 혼합하여 투수실험을 한 후 해성점토에 벤토나이트를 2%, 3%, 4% 혼합한 시료와 비교하였다. 점토는 3%에서 투수기준을 만족하였으며, 순환토사는 8%에서 투수기준을 만족하였다. 폐기물 매립장의 차수기준에 맞는 시료를 만들기 위해 벤토나이트 혼합비가 4%인 시료를 대상으로 폴리머를 0.16%, 0.24%, 0.28% 혼합하여 투수시험을 하였다. 동일한 혼합비로 일축압축시험을 하여 시방기준에 만족하는지 확인하였다. 벤토나이트 혼합비가 증가할수록 투수계수와 일축압축강도는 감소하였다. 폴리머 혼합시 강도는 초기에 증가한 후 일정한 값을 유지하였다. 폴리머 혼합시 벤토나이트 혼합비를 50% 이상 감소시킬 수 있음을 확인하였다. 폐기물매립장 바닥차수재로서 순환토사-벤토나이트-폴리머 혼합시료는 벤토나이트 혼합비 4%, 폴리머 혼합비 0.28%에서 투수계수는 1.0×10-7cm/sec 이하, 일축압축강도는 500kPa 이상을 만족하여 폐기물매립장의 혼합차수재로 활용이 가능함을 확인하였다.

Keywords

References

  1. Cho, Y. K., Nam, S. Y., Kim, C. S., Lee H. W., Jo, S. H. and Ahn, J. W. (2018), Evaluation of Physical Properties of Mine Polymer Liner and Cover Material Containing Re-emulsification Type EVA Resin, Polymer(Korea), The Polymer Society of Korea, Vol.42, No.4, pp.637-642. https://doi.org/10.7317/pk.2018.42.4.637
  2. Das, B. M. (2010), Principles of Geotechnical Engineering, Cengage Learning, USA.
  3. Jeon, H. Y., Park, Y. M. and Mok, M. S. (2002), Assessment of Hydraulic Properties of Bentonite Swelling Agents by Blending with Additives, Proceedings of Geosynthetics Conference, pp.85-93.
  4. Kim, W. T., Yoon, Y. H. and Park, B. J. (2007), Physico-Chemical Properties of the Recycled Waste Soils from Construction Site as Planting Soil, Journal of the Korea Society for Environmental Restoration and Revegetation, Vol.10, No.5, pp.31-39.
  5. KS F 2302 (2017), Standard Test Method for Particle Size Distribution of Soils, Korean Standards Association.
  6. KS F 2303 (2015), Standard Test Method for Liquid Limit and Plastic Limit of Soils, Korean Standards Association.
  7. KS F 2306 (2015), Standard Test Method for Water Content of Soils, Korean Standards Association.
  8. KS F 2308 (2016), Standard Test Method for Density of Soil Particles, Korean Standards Association.
  9. KS F 2312 (2016), Standard Test Method for Soil Compaction Using a Rammer, Korean Standards Association.
  10. KS F 2314 (2018), Standard Test Method for Unconfined Compression Test of Soils, Korean Standards Association.
  11. KS F 2576 (2010), Standard Test Method for Impurity Contents of Recycled Aggregate, Korean Standards Association.
  12. Lee, J. K. (2008), Strength and Permeability Properties of Admixed Clay Liner in Waste Landfill, M. S. Thesis, Incheon National University.
  13. Lee, J. S. (2012), A Study on the Engineering Properties of a Mixture of Pond Ash and Bentonite for Liner Material, M. S. Thesis, Hanyang University.
  14. Lee, S. K. (2018), Development of Bentonite Mixed Compacted Clay Liner by Modification of Field Available Soil, M. S. Thesis, Incheon National University.
  15. Lee, J. H. (2010), A Feasibility Study on Extended Recycling of Recycled Aggregates and Construction Waste Soil, G901:A-0009048700, Ministry of Enviroment.
  16. Shin, E. C., Kang, J. K. and Moon, Y. S. (2011), "Environmental Influence by Mixing Ratio of Granite Soil with Recycled Soil", Proceedings of the Spring 2011 Geosynthetics Conference, pp.17-24.
  17. Yun, S. Y., An, H. K., Oh, M. and Lee, J. Y. (2019), A Study on the Evaluation of Permeability and Structure for Calcium Bentonite-Sand Mixtures, Journal of Korean Geosynthetics Society, Vol.18, No.2, pp.1-10. https://doi.org/10.12814/JKGSS.2019.18.2.001