GB2421213A - Process for manufacture of reinforced concrete articles - Google Patents
Process for manufacture of reinforced concrete articles Download PDFInfo
- Publication number
- GB2421213A GB2421213A GB0525631A GB0525631A GB2421213A GB 2421213 A GB2421213 A GB 2421213A GB 0525631 A GB0525631 A GB 0525631A GB 0525631 A GB0525631 A GB 0525631A GB 2421213 A GB2421213 A GB 2421213A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- retardant
- article
- manufacture
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000004567 concrete Substances 0.000 claims abstract description 6
- 239000003365 glass fiber Substances 0.000 claims abstract description 5
- NFGXHKASABOEEW-GYMWBFJFSA-N (S)-methoprene Chemical group COC(C)(C)CCC[C@H](C)C\C=C\C(\C)=C\C(=O)OC(C)C NFGXHKASABOEEW-GYMWBFJFSA-N 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 abstract description 3
- 238000005253 cladding Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
- B28B7/362—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article specially for making moulded articles from concrete with exposed aggregate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
- B29C37/0032—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/54—Substitutes for natural stone, artistic materials or the like
- C04B2111/542—Artificial natural stone
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/802—White cement
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
A process for the manufacture of a reinforced concrete article i.e. cladding for buildings comprises the steps of applying a coating of a concrete surface retardant to the surface of a mould, filling the mould with a reinforced cementitious composition, allowing the composition to cure to form the article and removing the article from the mould. The reinforcement may be glass fibre and an optional mould release agent may be used wherein the retarder and release agent are applied by spraying or brushing.
Description
PROCESS FOR MANUFACTURE OF REINFORCED CONCRETE ARTICLES
This invention relates to a process for manufacture of glass fibre reinforced cement, particularly but not exclusively for manufacture of glass fibre reinforced cement articles which have a surface resembling traditional stone. Articles in accordance with the present invention may be used for building construction, particularly for cladding for buildings, girders or other structural components.
Previously articles have been moulded from glass reinforced cement but the resultant surfaces have either been smooth or have a plain texture. Neither of these surfaces are satisfactory as superficial imperfections are readily apparent. Furthermore these surfaces do not have the appearance of traditional stone.
Sandblasting of the articles has been used to obtain a gritty, stone-like finish, this process is messy, time consuming and necessitates double handling of the articles.
Washing of the articles with acid has also been carried out. While this does result in an acceptably stone-like finish, use of acid has numerous disadvantages. An inconsistent appearance or finish can be obtained resulting in a need for remedial treatment. Double handling is required. Protective clothing must be worn and the spent acid and washings must be disposed of. This presents an environmental difficulty.
According to the present invention a process for manufacture of a reinforced concrete article comprises of the steps of:
optionally applying a coating of a release agent to a surface of a mould, applying a coating of a concrete surface retardant to the surface of the mould, filling the mould with a reinforced cementitious composition, allowing the composition to cure to form an article, and removing the article from the mould.
The cementitious composition is preferably a glass fibre reinforced composition.
Washing with acid or sandblasting is not required in order to obtain a stone-like appearance.
The retardant may be a conventional surface retarder for concrete such as may be used for producing a light etch on exposed aggregate surfaces. Although such retarders are known for application to cured aggregate surfaces, the use in application to surfaces of a mould prior to moulding, has not been previously disclosed.
The retardant is preferably diluted with a solvent prior to use.
A preferred retardant is PRECO MINICOTE supplied by Pepcon Limited.
A preferred solvent is PRECO SOLVALL, supplied by Pepcon Limited.
In preferred processes the diluted mixture contains about 30-10%, preferably about 30-20%, more preferably about 25% of retardant.
The specification percentages and other proportions are by weight unless indicated otherwise. Proportions and percentages are selected to total 100%.
Preferred cementitious compositions contain generally equal weights of sand and cement. The cementitious material may be applied in layers to the internal surfaces of the mould in conventional manner.
The cured article may be washed with water after removal from the mould. Treatment with acid is not required.
Use of a release agent is optional. A preferred release agent is RECKLI-Mould-Wax supplied by RECKLI-Chemiewerkstoff GmbH.
The retarder and release agent, if used, may be applied to the surface of the mould by spraying. Brushing may also be employed. Each coating is allowed to dry before application of a subsequent coating. More than one coating of each material may be employed.
The invention is further described by means of example but not in any limitative sense.
Examples Internal faces of a conventional fibreglass or rubber mould were coated with PRECO mould release QD release agent and the surfaces were allowed to dry. A mixture containing PRECO-MINICOTE, 25% and PRECO-SOLVALL 75% was applied to the internal surfaces of the mould. The coating was allowed to dry.
A cementitous composition was prepared comprising:
Chelford 40 Sand 18kg White Snowcrete (Blue Circle) 16kg Cemfil Alkali Resistant Fibre 500g Purified Water 51 Polymer 400g An optional pigment may be used.
The ingredients were mixed in a conventional manner.
A first coating of the composition not containing any fibres was sprayed on to the internal surface of the mould to a thickness of 3mm. A second coating of the composition containing fibres was applied to a thickness of 6mm and the surface was hand finished. The coating was repeated to provide a third and final coat. Strengthening ribs were added as necessary dependent on the geometry or intended use of the article. The article was left to dry and cure for 12 to 16 hours.
The cured article was removed from the mould and washed with water followed by gentle brushing. The article was then set aside to dry. The article may comprise a cladding component for a building, girder or other structural component.
Claims (1)
- CLAIMS A process of a manufacture of a reinforced concrete article comprising the steps of: applying a coating of a concrete surface retardant to the surface of a mould, filling the mould with a reinforced cementitious composition, allowing the composition to cure to form an article, and removing the article from the mould. A process as claimed in claim I including the step of applying a coating of a release agent to the surface of the mould prior to applying the coating of the concrete surface retardant. A process as claimed in claim 1 or 2 wherein the composition is a glass fibre reinforced cementitious composition. The process as claimed in any preceding claim wherein the retardant is a conventional concrete surface retarder. A process as claimed in any preceding claim wherein the retardant is diluted with a solvent prior to use. A process as claimed in claim 5 wherein the retardant is PRECO MINICOTE (trademark of Pep Con Limited). A process as claimed in claims 5 and 6 wherein the solvent is PRECO SOLVALL (trademark of Pep Con Limited). A process as claimed in any preceding claim wherein the diluted mixture contains 30:10% of retardant. A process as claimed in claim 8 wherein the diluted mixture contains 30:20% of retardant. A process as claimed in any claim 9 wherein the diluted mixture contains 25% retardant. A process for manufacture of a reinforced concrete article substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0427519.4A GB0427519D0 (en) | 2004-12-16 | 2004-12-16 | Process for manufacture of reinforced concrete articles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0525631D0 GB0525631D0 (en) | 2006-01-25 |
| GB2421213A true GB2421213A (en) | 2006-06-21 |
Family
ID=34090116
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB0427519.4A Ceased GB0427519D0 (en) | 2004-12-16 | 2004-12-16 | Process for manufacture of reinforced concrete articles |
| GB0525631A Withdrawn GB2421213A (en) | 2004-12-16 | 2005-12-16 | Process for manufacture of reinforced concrete articles |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB0427519.4A Ceased GB0427519D0 (en) | 2004-12-16 | 2004-12-16 | Process for manufacture of reinforced concrete articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB0427519D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2935140A1 (en) * | 2008-08-21 | 2010-02-26 | W R Grace Co Conin | ESTER-BASED SURFACE TAMPER RETARDANTS |
| US20220412697A1 (en) * | 2021-06-25 | 2022-12-29 | 360º BALLISTICS, LLC | Ballistic fiberglass mold |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1038881A (en) * | 1962-02-05 | 1966-08-10 | Mil Wis Engineering Inc | Improved method of preparing a concrete structure |
| US4665673A (en) * | 1984-04-26 | 1987-05-19 | Silvio Diana | Monolithic surface ornamentation of pre-cast reinforced concrete wall |
| EP0401051A2 (en) * | 1989-06-01 | 1990-12-05 | Kabushiki Kaisha Zokei | Concrete non-cure coating material, and concrete products with surface pattern or decoration using said material and production process therefor |
-
2004
- 2004-12-16 GB GBGB0427519.4A patent/GB0427519D0/en not_active Ceased
-
2005
- 2005-12-16 GB GB0525631A patent/GB2421213A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1038881A (en) * | 1962-02-05 | 1966-08-10 | Mil Wis Engineering Inc | Improved method of preparing a concrete structure |
| US4665673A (en) * | 1984-04-26 | 1987-05-19 | Silvio Diana | Monolithic surface ornamentation of pre-cast reinforced concrete wall |
| EP0401051A2 (en) * | 1989-06-01 | 1990-12-05 | Kabushiki Kaisha Zokei | Concrete non-cure coating material, and concrete products with surface pattern or decoration using said material and production process therefor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2935140A1 (en) * | 2008-08-21 | 2010-02-26 | W R Grace Co Conin | ESTER-BASED SURFACE TAMPER RETARDANTS |
| EP2157070A3 (en) * | 2008-08-21 | 2010-03-10 | W. R. Grace & Co.-Conn | Method for retarding the setting of the surface of a concrete using ester-based concrete surface retarders |
| US20220412697A1 (en) * | 2021-06-25 | 2022-12-29 | 360º BALLISTICS, LLC | Ballistic fiberglass mold |
| US11598612B2 (en) * | 2021-06-25 | 2023-03-07 | 360° Ballistics, LLC | Ballistic fiberglass mold |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0525631D0 (en) | 2006-01-25 |
| GB0427519D0 (en) | 2005-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |