US4312904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast-hardening hydraulic cement mass and surfacing method using the mass
Assignee: Heidelberg Materials AG
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Filing: 1980-04-09
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Granted: 1982-01-26
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Expires: 2000-04-09
Abstract
Abstract A hydraulically setting mass having a small tendency to cracking and a felt-like structure when freshly mixed while showing no cracks or only microscopic cracks when in the hardened condition comprises essentially a fast-hardening hydraulic cement binder, water, alkali-resistant mineral fibers and additives. The freshly mixed mass is applied in a layer to the surface of a tube or the like, the applied mass is completely covered with a sheet and the mass is pressed against the surface with the sheet.
Inventors
- 👤 Adolf Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:10
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; B; B28; B28B; B28B19/00; B28B19/0038; C04B2111/00; C04B2111/00474; C04B2111/00482; Y; Y10; Y10S; Y10S138/00; Y10S138/06; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1317
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
62 words
A rigid tube coated with a hydraulically set concrete mixture having a small tendency to cracking in the set condition, the concrete mixture comprising essentially a rapid hardening cement selected from the group consisting of modified Portland cement containing a 11CaO.7Al 2 O 3 .CaF 2 phase and a Portland cement containing a hardening accelerator, water, alkali-resistant glass fibers, aggregates and additives.
Claim 2
Dependent Claim
62 words
A rigid tube coated with a hydraulically set concrete mixture having a small tendency to cracking in the set condition, the concrete mixture comprising essentially a rapid hardening cement selected from the group consisting of modified Portland cement containing a 11CaO.7Al 2 O 3 .CaF 2 phase and a Portland cement containing a hardening accelerator, water, alkali-resistant glass fibers, aggregates and additives.
Claim 3
Dependent Claim
14 words
The coated tube of claim 1, wherein the additives include a water reducing agent.
Claim 4
Dependent Claim
23 words
The coated tube of claim 1, wherein the additives includes an agent enhancing the adhesion of the concrete mixture coating to the tube.
Claim 5
Dependent Claim
20 words
The coated tube of claim 1, wherein the concrete mixture comprises 1.5 to 2.0%, by volume, of the glass fibers.
Claim 6
Dependent Claim
21 words
The coated tube of claim 1, wherein the tube consists of steel, cast iron, concrete, asbestos cement, ceramic or synthetic resin.
Claim 7
Dependent Claim
17 words
The coated tube of claim 1, further comprising an organic surface coating on the concrete mixture coating.
Claim 8
Dependent Claim
13 words
The coated tube of claim 6, wherein the organic surface coating is detachable.
Claim 9
Independent Claim
117 words
A method of coating a rigid tube with a hydraulically setting concrete mixture having a small tendency to cracking in the set condition, the concrete mixture comprising essentially a rapid hardening cement selected from the group consisting of modified Portland cement containing a 11CaO7Al 2 O 3 .CaF phase and a Portland cement containing a hardening accelerator, water, alkali-resistant glass fibers, aggregates and additives, which comprises the steps of applying the concrete mixture before setting in a layer of a desired thickness to a surface of the tube, competely covering the applied concrete mixture no later than immediately after application with a sheet, and pressing the concrete mixture against the surface of the tube with the sheet.
Claim 10
Independent Claim
117 words
A method of coating a rigid tube with a hydraulically setting concrete mixture having a small tendency to cracking in the set condition, the concrete mixture comprising essentially a rapid hardening cement selected from the group consisting of modified Portland cement containing a 11CaO7Al 2 O 3 .CaF phase and a Portland cement containing a hardening accelerator, water, alkali-resistant glass fibers, aggregates and additives, which comprises the steps of applying the concrete mixture before setting in a layer of a desired thickness to a surface of the tube, competely covering the applied concrete mixture no later than immediately after application with a sheet, and pressing the concrete mixture against the surface of the tube with the sheet.
Claim 11
Dependent Claim
59 words
The tube coating method of claim 8, comprising the further steps of positioning the tube with its axis extending horizontally, turning the tube about the horizontally extending axis while continuously applying the layer of the concrete mixture to the surface of the tube, enveloping the applied layer with the covering sheet and pressing the enveloping sheet against the layer.
Claim 12
Dependent Claim
70 words
The tube coating method of claim 8, comprising the further steps of roating the tube, applying the concrete mixture before setting to the sheet, conveying the concrete mixture from the sheet to the surface of the rotating tube to apply the layer to the surface, and winding the sheet about the surface of the tube to cover the layer and press the concrete mixture against the surface of the tube.
Claim 13
Dependent Claim
30 words
The tube coating method of claim 9 or 10, wherein the sheet is a lost or detachable form for applying the concrete mixture layer to the surface of the tube.
Claim 14
Dependent Claim
23 words
The tube coating method of claim 11, further comprising the step of applying an adhesive between the sheet and the concrete mixture layer.
Claim 15
Dependent Claim
14 words
The tube coating method of claim 8, wherein the sheet is of impermeable material.
Claim 16
Dependent Claim
21 words
The tube coating method of claim 8, wherein the sheet is fiber-reinforced to increase its tensile strength and impact tear strength.
Claim 17
Dependent Claim
14 words
The concrete mixture of claim 8, wherein the additives include a water reducing agent.
References Cited (Backward Citations)
US3742985A
Cited
US3949144A
Cited
US3767435A
Cited
US3753849A
Cited
GB1429167A
Cited
US4133928A
Cited
US3984266A
Cited
US4067164A
Cited
US4159361A
Cited
US4192690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |