Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지
DOI QR코드

DOI QR Code

Research on Characteristics of Multifunctional Soil Binder Based on Polyacrylamide

폴리아크릴아마이드를 기반으로 하는 다기능성 토양안정제의 특성에 관한 연구

  • Received : 2017.10.10
  • Accepted : 2017.12.18
  • Published : 2018.04.10
Download PDF
⟨ Previous Next ⟩

Abstract

For the efficient recovering of collapsed sloped soil, using a soil binder that can support the soil strongly and help the growth of plants is very important. The soil binder should also have functions of recovering the soil ecologically as well as be environmental friendly materials. In this research, optimum values of the water content and permeability and direct shear strength were searched by adding the water absorbent and coagulant into the soil binder. The polyacrylamide (PAM) with various anionic strength, super absorbent polymer (SAP) and cellulose ether (CE) were used as a soil binder, water absorbent and coagulant, respectively. Effects of the soil binder on the characteristics of soil were observed by changing the mixing ratio of PAM, SAP and CE. Experimental results showed that the soil binder increased the direct shear strength tens of times and the water content around two times, whereas decreased the water permeability. Also, the addition of CE to increase the coagulation of SAP increased more of the direct shear strength and water content.

훼손된 비탈면을 효율적으로 복구하고 토양을 견고하게 지지하고 식물 생장을 도울 수 있는 토양바인더 사용이 매우 중요하다고 할 수 있다. 이러한 토양바인더는 토양을 오염시키지 않는 친환경 소재이면서 토양의 생태를 복원할 수 있어야 한다. 본 연구에서는 토양바인더 외에 흡수제와 응집제를 첨가하여, 최적의 함수율, 투수계수, 직접전단강도 값을 갖는 조건을 도출하였다. 토양바인더로는 다양한 음이온강도의 polyacrylamide (PAM)를, 흡수제로는 super absorbent polymer (SAP), 응집제로는 cellulose ether (CE)를 사용하여 그 효과를 관찰하였다. 그 결과 우선 토양바인더를 사용한 경우 토양시험편의 직접전단강도와 함수율을 각각 수십 배 이상 그리고 두 배 이상 증가시킬 수 있었으며 변수위 투수계수를 낮춤으로 인해 방수의 효과가 증가함을 관찰되었다. 첨가제로서 SAP를 사용한 경우 그 효과를 더욱 높일 수 있었고 SAP의 응집력을 높이기 위해 첨가된 CE 역시 직접전단강도와 함수율을 높임을 관찰할 수 있었다.

Keywords

References

  1. J. H. Kim, S. W. Park, S. S. Jeong, and J. H. Yoo, A study of stability analysis on unsaturated weathered slopes based on rainfall-induced wetting, J. Korean Geothech. Soc., 18(2), 123-136 (2002).
  2. G. M. Sa, M. S. Kim, S. S. Kim, and I. Y. Lee, Analysis on the rainfall driven slope failure adjacent to a railway: Flume tests, J. Korean Geotech. Soc., 22(5), 83-91 (2006).
  3. Y. S. Song, W. P. Hong, J. M. Yun, and T. Y. Kim, Slope stability considering infiltration velocity during rainfall, In: Korean Society of Civil Engineers Annual Conference, 4454-4457 (2005).
  4. S. E. Cho and S. R. Lee, A comarative study of surficial stability analysis in unsaturated soil slopes, J. Korean Geotech. Soc., 17(4), 135-143 (2001).
  5. Y. S. Kim, J. H. Kim, I. H. Bhang, and S. G. Seo, A study on rainfall-induced erosion of land surface on reinforced slope using soil improvement material, J. Korean Geotech. Soc., 29(1), 49-50 (2013). https://doi.org/10.7843/kgs.2013.29.1.49
  6. B. Trzebiatowski, T. Edil, and C. Benson, Case study of subgrade stabilization using fly ash: State Highway 32, Port Washington, Wisconsin. In: ASCE Civil Engineering Conference and Exposition 2004, ASCE GSP No. 127, 123-136 (2005).
  7. T. B. Edil, H. A. Acosta, and C. H. Benson, Stabilizing soft fine-grained soils with fly ash, J. Mater. Civil Eng., 18(2), 283-294 (2006). https://doi.org/10.1061/(ASCE)0899-1561(2006)18:2(283)
  8. K. H. Kim, Y. T. Kim, and S. H. Lee, A study on slope reinforcing effects using soil stabilizer, J. Korean Geothech. Soc., 26(10), 5-6 (2010).
  9. J. A. Entry, R. E. Sojka, M. Watwood, and C. Ross, Polyacrylamide preparations for protection of water quality threatened by agricultural runoff contaminants, Environ. Pollut., 120, 192-193 (2002).
  10. V. S. Green, D. E. Stott, L. D. Norton, and J. G. Graveel, Polyacrylamide molecular weight and charge effects on infiltration under simulated rainfall, Soil Sci. Soc. Am. J., 64, 1786-1790 (2000). https://doi.org/10.2136/sssaj2000.6451786x
  11. J. A. Entry, R. E. Sojka, M. Watwood, and C. Ross, Polyacrylamide preparations for protection of water quality threatened by agricultural runoff contaminants, Environ. Pollut., 11, 183-185 (2002).
  12. I. Shainberg and G. J. Levy, Organic polymers and soil sealing in cultivated soils, Soil Sci., 158, 267-273 (1994). https://doi.org/10.1097/00010694-199410000-00006
  13. J. Idowu and S. Angadi, Understanding and managing soil compaction in agricultural fields, Agricultural Science Center at Clovis, New Mexico State University, Circular, 672, 2-3 (2013).
  14. A. Wallance and G. A. Wallance, Need for solution or exchangeable calcium and/or critical EC level for flocculation of clay by polyacrylamides. In: Proceedings of the Managing Irrigation-Induced Erosion and Infiltration with Polyacrylamide, pp. 59-63, May 6-8, Twin Falls, ID, USA (1996).
  15. M. Ben-Hur, M. Malik, J. Letey, and U. Mingelgrin, Adsorption of polymers on clays as affected by clay charge and structure, polymer properties, and water quality, Soil Sci., 153(5), 349-356 (1992). https://doi.org/10.1097/00010694-199205000-00002
  16. S. B. Kanungo, Effect of some commercial flocculating agents on settling and filtration rates of low grade, fragile manganese ores of Andhra Pradesh, Indian J. Chem. Technol., 12, 557-558 (2005).
  17. B. K. G. Theng, Formation and Properties of Clay-Polymer Complexes, 2nd ed., 60-63, Elsevier (2012).