Development of Filling Material with Fly Ash and Slag as Lubricant in Pipe Jacking Under Acid Sulfate Soils

  • Kazuki MAEHARA Kyushu University, Department of Earth Resources Engineering, 744, Motooka, Nishi-ku, Fukuoka, Japan
  • Hideki SHIMADA Kyushu University, Department of Earth Resources Engineering, 744, Motooka, Nishi-ku, Fukuoka, Japan
  • Takashi SASAOKA Kyushu University, Department of Earth Resources Engineering, 744, Motooka, Nishi-ku, Fukuoka, Japan
  • Akihiro HAMANAKA Kyushu University, Department of Earth Resources Engineering, 744, Motooka, Nishi-ku, Fukuoka, Japan
DOI: https://doi.org/10.29227/IM-2020-01-46
Keywords: pipe jacking method, acid sulfate soils, slag, fly ash

Abstract

The pipe jacking method is relatively reasonable among trenchless construction methods.
For the application of this method, the acid sulfate soils have negative impacts on filling materials (one of the cement materials) injected into the tail-void which are over-cutting areas formed to reduce the friction between the pipes and the surrounding soils. In this
study, the application of fly ash and slag is discussed to minimize the effect of sulfur acid to filling materials. As the results of the experiments, the addition of fly ash and slag can control the gelling time and prevent the reduction of uniaxial strength of filling materials
under the acid sulfate soils. In addition, the filling materials added slag lowered frictional resistance compared to that of fly ash. Filling
materials with the lower frictional resistance are preferred to apply for the smooth pipe jacking constructions. Therefore, filling materials added slag would show better performance than that of fly ash under the acid sulfate soils due to its lower frictional resistance.

Published
2020-11-20
How to Cite
MAEHARA, K., SHIMADA, H., SASAOKA, T., & HAMANAKA, A. (2020). Development of Filling Material with Fly Ash and Slag as Lubricant in Pipe Jacking Under Acid Sulfate Soils. Test, 2(1), 89–93. https://doi.org/10.29227/IM-2020-01-46
Issue
Vol 2 No 1 (2020): Inżynieria Mineralna
Section
ARTICLES

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