Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Development of Reinforcement Grout Materials Using Blast Furnace Slag Powder and Aramid Fiber

고로슬래그 미분말과 아라미드 섬유를 이용한 보강그라우트재 개발

  • Received : 2019.01.16
  • Accepted : 2019.03.19
  • Published : 2019.03.30
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Abstract

The grouting method is utilized to reinforce and waterproof poor grounds, enhance the bearing capacity of structures damaged resulting from settlement due to elevation and vibration or differential settlement, and for cutoff. The purpose of this research is to enhance the compressive strength of grout materials by using aramid fiber and develop a high-strength ground improvement method by using blast furnace slag powder. In this regard, this study has conducted a uniaxial compression test after checking the high charge (higher than 50%) of the ratio of blast furnace slag powder and cement at 100:0, 70:30 and 40:60%, adding the aramid mixture based on 0, 0.5 and 1.0% of the cement and furnace slag powder weight and creating sand gels based on surface oiling rate of 0.7 and 1.2%. For the environmental review evaluation, a heavy metal exudation test and a pH test measurement have been conducted. The experiment results showed that 1% increase of aramid fiber led to 1.3 times greater uniaxial compression intensity. As for the hexavalent chrome, a 30% increase in blast furnace slag powder led to approximately 50% decrease in heavy metal exudation. However, the pH test revealed that a 30% increase in blast furnace slag powder resulted in approximately 0.5 increase in pH. Further research on the pH part is needed in the future.

그라우팅 공법은 연약지반의 보강과 방수 및 지하수위저하 또는 상승과 진동으로 인한 침하 및 부등침하로 손상된 구조물의 지지력을 높이고 차수를 목적으로 하는데 사용된다. 본 연구는 아라미드 섬유를 이용하여 그라우트재료의 압축강도를 향상시키고, 고로슬래그 미분말을 이용하여 높은 강도의 지반개량공법을 개발하는데 있다. 따라서 본 연구에서는 시멘트와 고로슬래그미 분말의 비는 100:0, 70:30, 40:60%로 고치환(50%이상)까지 확인하고, 아라미드 혼입률은 시멘트와 고로슬래그 중량의 0, 0.5, 1.0%로 증가시켜 첨가하였으며, 표면의 유제처리 비율을 0.7과 1.2%로 샌드겔을 성형하여 일축압축시험을 수행하였다. 환경성 평가는 중금속용출시험과 pH 측정을 수행하였다. 실험결과 아라미드 섬유 1%첨가 시 일축압축강도는 약 1.3배 정도 강도가 증가하였고, 6가크롬은 고로슬래그 미분말이 30% 증가할수록 중금속 용출은 약 50% 감소하였으나, pH용출시험결과, 고로슬래그 미분말이 30% 증가할수록 pH는 약 0.5 증가하는 경향을 나타났다. 향후 pH에 대한 부분은 보완이 필요할 것으로 판단된다.

Keywords

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Fig. 1. Aramid fiber

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Fig. 2. Process of uniaxial compression experiment test

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Fig. 3. Electron microscope

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Fig. 4. Analysis of Uniaxial Compression Strength by C:B Mixing Ratio

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Fig. 5. Analysis of Uniaxial Compression Strength by O:A Mixing Ratio

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Fig. 6. Images of SEM without fiver

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Fig. 7. Images of SEM using aramid fiber

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Fig. 8. pH Leaching test results

Table 1. Mixing ratio of grout materials for uniaxial compression strength measurement

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Table 2. pH test method

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Table 3. Uniaxial Compression Strength test result of Sand-gel

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Table 4. EDX analysis results for C:B (100 : 0%)

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Table 5. EDX analysis results for C:B (70 : 30%)

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Table 6. EDX analysis results for C:B (40 : 60%)

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Table 7. Heavy metal leaching test results

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Table 8. pH Leaching test results

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References

  1. Choi, S. G. (2013), Development of environment-friendly sand cementation using blast furnace slag and calcite precipitation, Kyungpook National University, Doctor Thesis.
  2. Han, C. G., Kim S. H. and Son, H. J. (2009), Engineering Characteristics Analysis of High Strength Concrete Followed in replacement ratio increase in Blast Furnace Slag, Journal of the Korean Recycled Construction Resources Institute, Vol.7, pp.62-68.
  3. Kim, H. C. (2017), A Study on the development of a grouting material containing blast furnace slag and carbon fiber, Chosun University, Ph. D. Thesis.
  4. Nam, J. S., Yoo, J. C., Kim, G. Y., Kim, H. S. and Jeon, J. K. (2014), Improvement of the Strength Properties and Impact Resistance of the Cement Composite Materials by the use of Surface Modification of the Aramid Fibers, Journal of Korea institue for Structural Maintenance Inspection, Vol.19, No.1, pp.100-108.
  5. Shah, S. P. and Rangan, B. V. (1971), Fiber Reinforced Concrete Properties, ACI Materials Journal, 68(2), pp.126-135.
  6. Yang, Y. H. (2017), Evaluation of Reinforcement Effect of Grouting using Aramid Fiber, Chosun University, Master Thesis.

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