US4367986A
Expired / Lapsed
US
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Method for improving the strength of a water-saturated soft soil
Assignee: Chiyoda Corp
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Filing: 1981-10-08
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Granted: 1983-01-11
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Expires: 2001-10-08
Abstract
Abstract A water-saturated soft soil is efficiently improved in its strength by incorporating therein an additive composed of ingredients A and B; the ingredient A comprises gypsum and the ingredient B comprises a mixture of 40-55% by weight of a Portland cement and 60-45% by weight of a water-granulated iron blast furnace slag having a particle size almost equal to or smaller than that of the Portland cement. The ratio by weight of the ingredient A to the ingredient B ranges from 10/90 to 30/70 and the total amount of the ingredients A and B used for the soft soil is sufficient to strengthen the soft soil.
Inventors
- 👤 Hajime Miyoshi
- 👤 Ikuo Okabayashi
- 👤 Etsuo Asanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:30
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/02; C09K17/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A method for improving the strength of a water-saturated soft soil, which comprises admixing the soft soil with an ingredient A comprising gypsum and an ingredient B comprising a mixture of 40-55% by weight of a Portland cement and 60-45% by weight of a water-granulated iron blast furnace slag, the slag having a particle size almost the same as or less than that of the cement, the ratio by weight of the ingredient A to the ingredient B being within the range from 10/90 to 30/70, and the soft soil being admixed with the ingredient A simultaneously with the ingredient B.
Claim 2
Independent Claim
101 words
A method for improving the strength of a water-saturated soft soil, which comprises admixing the soft soil with an ingredient A comprising gypsum and an ingredient B comprising a mixture of 40-55% by weight of a Portland cement and 60-45% by weight of a water-granulated iron blast furnace slag, the slag having a particle size almost the same as or less than that of the cement, the ratio by weight of the ingredient A to the ingredient B being within the range from 10/90 to 30/70, and the soft soil being admixed with the ingredient A simultaneously with the ingredient B.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein the total amount of the ingredients A and B is 50-50 kg per cubic meter of the soft soil.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein the Portland cement is Ordinary Portland cement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |