METHOD FOR IMPROVING GROUND

To provide a method for improving the ground, wherein the improved ground body has high initial strength, and the increase in the viscosity of soil cement can be prevented even when using the soil with a high mineral content such as marine clay.SOLUTION: The present invention is a method for improving the ground, comprising mixing soil with a cement containing CA in an amount of 5 to 15 mass% inclusive, at least one polymer (A) selected from polyacrylic acids and salts thereof, at least one acid compound (B) selected from organic acids and inorganic acids each having a molecular weight of 500 or less, at least one compound (C) selected from metal carbonates and metal bicarbonates, and water.SELECTED DRAWING: None 【課題】地盤改良体の初期強度が高く、海成粘土のようなミネラル分が多い土壌を用いた場合でもソイルセメントの増粘を抑制できる、地盤の改良工法を提供する。【解決手段】土壌に、Ｃ３Ａを５質量％以上１５質量％以下含むセメントと、ポリアクリル酸及びその塩から選ばれる少なくとも１種類の重合体（Ａ）と、分子量５００以下の有機酸及び無機酸から選ばれる１種類以上の酸化合物（Ｂ）と、金属炭酸塩及び金属重炭酸塩から選ばれる１種類以上の化合物（Ｃ）と、水とを混合する、地盤の改良工法。【選択図】なし