HIGH ORGANIC SOIL AND SOLIDIFICATION MATERIAL FOR HUMUS SOIL

To provide an economical cement-based solidification material capable of effectively solidifying high organic soil or humus soil high in content of organic acid and moisture content, and having difficulty of improvement, for improving organic soft ground, with small added amount.SOLUTION: There is provided a cement-based solidification agent, which is a solidification material for high organic soil or humus soil containing cement, blast furnace slag fine particle and anhydrous gypsum, in which total amount of the blast furnace slag fine particle and the anhydrous gypsum to total amount of the cement, the blast furnace slag fine particle and the anhydrous gypsum is 15 to 40 mass%, and the blast furnace slag fine particle to the total amount of the cement, the blast furnace slag fine particle and the anhydrous gypsum is 10 mass% or more. There is provided a cement-based solidification agent, in which preferably Blaine specific surface area of the blast furnace slag fine particle of 8000 cm/g or more. There is provided a cement-based solidification agent, in which preferably a ratio of the blast furnace slag fine particle and the anhydrous gypsum 23 is (blast furnace slag fine particle/anhydrous gypsum)≤1.5.SELECTED DRAWING: Figure 1 【課題】有機質軟弱地盤を改良するためであって、改良が困難であった有機酸の含有量および含水比が高い高有機質土又は腐植土を少ない添加量で有効に固化できる経済的なセメント系固化材の提供。【解決手段】セメントと高炉スラグ微粉末と無水石こうとを含む高有機質土または腐植土用固化材であって、セメントと高炉スラグ微粉末と無水石こうとの合計量に対する高炉スラグ微粉末と無水石こうの合計量が１５〜４０質量％であり、かつ前記セメントと高炉スラグ微粉末と無水石こうとの合計量に対して高炉スラグ微粉末を１０質量％以上含むセメント系固化材。好ましくは、前記高炉スラグ微粉末のブレーン比表面積が８０００ｃｍ２／ｇ以上である、セメント系固化剤。前記高炉スラグ微粉末と無水石こう２３の比が（高炉スラグ微粉末／無水石こう）≦１．５であることが、好ましい、セメント系固化剤。【選択図】図１