Development of synthetic polymer grouting material

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Other Title
  • 複合ポリマー型地盤改良剤の開発
  • - Chemical grouting method effective even for alkaline ground -
  • －アルカリ性を呈する地盤にも有効な薬液注入技術－

Description

<p>This paper introduces polymeric material (synthetic polymer grouting material) developed for the purpose of liquefaction countermeasures by chemical grouting. The safety, improved strength, durability, and applicability of the chemicals to actual ground are reported. Regarding safety, as a result of carrying out elution tests using sand gels, they met the standards of the Soil Contamination Countermeasures Law. The following were also carried out: Acute toxicity test of fish, abrupt swimming inhibition test of crustacean and zooplankton, growth inhibition test of algae and seagrass, and it was proven that the effect of this chemicals on aquatic organisms was very small. With regard to the improved strength, it was found that the sand gel produced by this chemical solution obtained unconfined compressive strength of 100 to 500 kN/m2 and liquefaction strength specific RL20 of about 1.0, both when neutral sand was used and when alkaline (pH 9 to 12) sand was used. Regarding long-term durability, a decomposition acceleration test in which a sand gel was placed under a high temperature of 80℃ was carried out, and unconfined compressive strength did not decrease even after 180 days (equivalent to 30 years) passed. Similar studies were also conducted using pH 11 adjusted sands, and the unconfined compressive strength did not decrease after 160 days (equivalent to 28 years). The permeability coefficient of the sand gel was 1×10-6 to 1×10-9 cm/s (1×10-8 to 1×10-11 m/s) in the range of chemical concentration used (6 to 18%). After confirming these basic physical properties, a field test using this chemical was carried out at a reclaimed ground in the coastal area. As a result, the radius of the improved body secured the design value, and the improved strength satisfied the design standard strength.</p>

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