Method for strengthening soft soil
AssigneeChiyoda Chemical Engineering & Constr., Co., Ltd.
InventorsHajime Miyoshi, Etsuo Asanagi, Junsuke Iguchi, Ikuo Okabayashi
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Abstract
A high water content soft soil, for example from the sea or river bed, may be improved in strength by incorporating thereinto an additive composed of ingredient A including a mixture of 5-45% by weight of gypsum and 95-55% by weight of a water-granulated iron blast furnace slag having an particle size within the range of 100-1 .mu.m and ingredient B including a Portland cement. The ratio by weight of ingredient A to ingredient B is within the range of 75/25-55/45. Ingredient A is incorporated into the soft soil before incorporation of ingredient B.
Claims4
A method for improving the strength of a water-saturated soft soil:
- premixing 5-45% by weight particulate gypsum and 55-95% by weight of a water-granulated iron blast furnace slag having a particle size of 1-100 .mu.m to obtain a first homogeneous admixture (A) of slag particles and gypsum particles;
- then admixing said first admixture (A) with the soft soil to obtain a second homogeneous admixture;
- and then
- admixing (B) a Portland cement with said second admixture in an amount to provide a weight ratio of said first admixture (A) to said Portland cement (B) within the range of 75/25 to 55/45, whereby the period of time required to obtain a homogeneous mix with the soil is less than when the slag is premixed with the cement.
Dependencies are inferred from the claim text.