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US 4,465,518 AGranted
Process for strengthening soft soil
AssigneeChiyoda Chemical Engineering & Const. Co.
InventorsHajime Miyoshi, Etsuo Asanagi, Osamu Terashima
Life of this patent
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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 a finely divided, quenched iron blast furnace slag treated with sulfuric acid, and a Portland cement. The sulfuric acid-treated slag is a product obtained by reacting a finely divided, quenched iron blast furnace slag, such as a water-granulated iron blast furnace slag, with sulfuric acid to convert a part of its calcium components into gypsum.
Claims10
A process for improving the strength of a water-saturated soft soil comprising:
- providing a finely divided, non-crystalline, calcium-containing iron blast furnace slag;
- treating said slag with an aqueous solution containing 20-500 g sulfuric acid per 1 kg of slag to provide an acid-treated slag (A) with conversion of a part of the calcium content of said slag to gypsum;
- admixing said acid-treated slag with the soft soil to be treated;
- and
- admixing said acid treated slag and the soft soil with (B) a Portland cement to obtain an unconfined compressive strength of the soil greater than that obtained by using comparable amounts of cement, calcium sulfate and unacidified slag.
2 more elements
Dependencies are inferred from the claim text.