| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive for a cement-based solidifying material, which has a high effect to improve the strength developing property of a solidifying material or cement, in the case when a sandy soil is a target soil.SOLUTION: The additive for a cement-based solidifying material is used for a cement-based solidifying material or cement, used for a sandy soil, as a target soil, and is composed of a limestone powder which is characterized in that the passing rate through a sieve having a nominal dimension of 600 μm is 100 mass%, the passing rate through a sieve having a nominal dimension of 150 μm is 90 mass% or more, and the passing rate through a sieve having a nominal dimension of 75 μm is 70 mass% or more. Further, an additive-containing solidifying material contains 1-20 pts.mass of the additive for a cement-based solidifying material to 100 pts.mass of the cement-based solidifying material or the cement. Furthermore, a method for producing an improved soil comprises adding the additive-containing solidifying material to the sandy soil in an amount of 100-500 kg per 1 mof the sandy soil and mixing them. |
