改良土・軽量土（締固め・配合）

[22-3-2-04] Possibility of “Earth Silica” Mixed with Surfactant-Type Liquid Thickener on a Backfilling Material in Pile Extraction Holes

*EISUKE Aizawa AIZAWA¹, RYO HASHIMOTO¹, MASAHIRO OKABAYASHI¹, YOJI HONNTANI², MASANORI SEKI², ATSUYA YOSHIMOTO³, SHUICHI KUWAHARA⁴, SHINYA INAZUMI⁵ (1. Doboku Chishitsu Co., Ltd., 2. Sanshin Corporation, 3. Amangu. Co., Ltd., 4. Marushin Co. Ltd., 5. Shibaura Institute of Technology)

Keywords:backfilling material for pile extraction holes, Earth Silica, hexavalent chromium elution