GB2063846A - Cementitious coating composition - Google Patents
Cementitious coating composition Download PDFInfo
- Publication number
- GB2063846A GB2063846A GB7940674A GB7940674A GB2063846A GB 2063846 A GB2063846 A GB 2063846A GB 7940674 A GB7940674 A GB 7940674A GB 7940674 A GB7940674 A GB 7940674A GB 2063846 A GB2063846 A GB 2063846A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- composition according
- composition
- mica
- weight
- 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.)
- Granted
Links
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
- C04B28/04—Portland cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Building Environments (AREA)
Abstract
A free-flowing asbestos-free solid composition, which on admixture with water forms a slurry sprayable onto a substrate to form a non-combustible coating protective against fire, contains a water-soluble thickener e.g. a cellulose ether and mica in addition to the conventional ingredients exfoliated vermiculite, water-settable particulate cementitious binder such as Portland cement, and air-entrainment agent. Inclusion of the thickener and the mica enables a coating giving a desired degree of fire protection to be built up more quickly.
Description
SPECIFICATION
Asbestos-free compositions
This invention relates to asbestos-free compositions, and particularly to free-flowing asbestos-free solid compositions adapted on admixture with water to form a slurry which is sprayable onto a substrate such as structural steel to form a non-combustible coating protecting the substrate against fire.
A known product of this kind is based on exfoliated vermiculite and a water-settable particulate cementitious binder such as Portland cement, and contains a small proportion of an air-entrainment agent (e.g. a powdered dry lignosulphonate). In use, the composition is mixed with 12-2 parts by weight of water, and the slurry containing entrained air that forms after a few minutes mixing is sprayed onto the substrate to be protected. The slurry is applied layer by layer until a coating of the desired thickness has been built up, an appropriate period (amounting to several hours) being allowed to elapse between applications of successive layers in order to allow each layer to take up a degree of set.With a smooth substrate such as steel, the first layer of slurry has to be applied at a thickness of no more than about 6 mm; if an appreciably thicker layer is deposited it tends to slide away or become otherwise deformed. Deposition of subsequent layers tends also to be unduly time-consuming.
The present invention provides a composition which can be used to form on smooth substrates a coating of a given degree of fire protection more quickly, by virtue of its greater adhesiveness and cohesiveness.
According to the invention, there are included in the known composition based on exfoliated vermiculite and water-settable particulate cementitious binder and containing a small proportion of air-entrainment agent, two additional ingredients: a water-soluble thickener and mica. The weight proportions of these latter ingredients are preferably in the ranges 0.1-2% and 2-15% respectively.
Preferably the weight proportions of the predominant ingredients exfoliated vermiculite and watersettable cementitious binder are respectively in the ranges 40-75% and 20-40%, and the weight ranges 55-70% for the vermiculite and 25-35% for the binder are particularly preferred. A preferred range of mica content is 4-10% by weight
The compositions of the invention do not require any fibrous material such as cellulose fibres (fibrous material being potentially respirable and therefore arguably hazardous) as reinforcement for the fire protective coating to be formed.
The water-soluble thickener employed is preferably a non-ionic ether of cellulose, for example cellulose hydroxyethyl ether.
The mica (which is, of course, employed in finely divided form) has a useful property in addition to that of improving the flow properties of the slurry that is sprayed, in that it also improves the high temperature crack-resistance of the eventual hardened coating, so that for a coating of given thickness the substrate is protected for a correspondingly longer period during an outbreak of fire.
The water-settable particulate cementitious binder is preferably a Portland cement of particle size small enough to make it classifiable as a 'rapid hardening Portland cement'. This particle size corresponds to a particle surface area greater than about 300 m2/kg. The binder requires no water-settable set-accelerators such as calcium chloride; such accelerators are highly corrosive towards steel.
The invention is further illustrated by the following Example.
Example
A non-combustible free-flowing asbestos-free solid composition was prepared by mixing together the following ingredients in the following proportions:
% by weight
Exfoliated vermiculite
(granules 1-2mm side) 62.0
Rapid hardening Portland cement
(surface area, 350 m2/kg) 31.0
Mica
(particle size 75-150 ijm) 6.1
Hydroxyethyl cellulose 0.4
Air-entraining agent (as dry powder) 0.5
100.0
In use, one part by weight of the composition is mixed with 1 -2 parts by weight of water in a paddle blade mixer, and when (after a few minutes mixing) the slurry formed has attained a pumpable consistency, it is pumped to a conventional sprayer head and sprayed onto the substrate to be protected. A layer 12 mm thick is laid down at a single pass, and allowed to set during 2 hours (assuming normal ambient conditions of temperature and humidity). Subsequent layers also 12 mm thick can then be sprayed onto the first layer, with a period of 2 hours being allowed to elapse between successive applications, until a coating of the desired thickness e.g. 50 mm has been built up.
The density of the set coating will usually be in the range 500-650 kg/m3.
Claims (9)
1. A free-flowing asbestos-free solid composition which on admixture with water forms a slurry sprayable onto a substrate to form a non-combustible coating protective against fire, the composition being based on exfoliated vermiculite and a water-settable particulate cementitious binder and containing an air-entrainment agent, said composition additionally including a water-soluble thickener and mica.
2. A composition according to claim 1, in which the water-soluble thickener and the mica are present in weight proportions in the ranges 0.1-2% and 2-15% respectively.
3. A composition according to claim 1 or 2, in which the exfoliated vermiculite and the water-settable particulate cementitious binder respectively form 40-75% and 20-40% by weight of the composition.
4. A composition according to claim 3, in which the vermiculite and the binder respectively form 55-70% and 25-35% by weight of the composition.
5. A composition according to any one of claims 1 to 4, which contains 4-10% by weight of mica.
6. A composition according to any of claims 1 to 5, in which the water-settable thickener is a non-ionic ether of cellulose.
7. A composition according to claim 6, in which said ether is a hydroxyethyl ether.
8. A composition according to any one of claims 1 to 7, in which the binder is a rapid-hardening Portland cement.
9. A composition according to claim 1 substantially as described with reference to the Example.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7940674A GB2063846B (en) | 1979-11-24 | 1979-11-24 | Cementitious coating composition |
| AU64647/80A AU537660B2 (en) | 1979-11-24 | 1980-11-24 | Asbestos free cement composition containing mica |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7940674A GB2063846B (en) | 1979-11-24 | 1979-11-24 | Cementitious coating composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2063846A true GB2063846A (en) | 1981-06-10 |
| GB2063846B GB2063846B (en) | 1983-04-07 |
Family
ID=10509397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7940674A Expired GB2063846B (en) | 1979-11-24 | 1979-11-24 | Cementitious coating composition |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU537660B2 (en) |
| GB (1) | GB2063846B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3237722A1 (en) * | 1982-10-12 | 1984-04-12 | Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck | Roadway support system with simultaneous thermal insulation and a preferably simultaneous dust-binding effect |
| GB2454893A (en) * | 2007-11-22 | 2009-05-27 | Naylor Concrete Products Ltd | Concrete lintel with fire resistant cementitious coating |
-
1979
- 1979-11-24 GB GB7940674A patent/GB2063846B/en not_active Expired
-
1980
- 1980-11-24 AU AU64647/80A patent/AU537660B2/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3237722A1 (en) * | 1982-10-12 | 1984-04-12 | Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck | Roadway support system with simultaneous thermal insulation and a preferably simultaneous dust-binding effect |
| GB2454893A (en) * | 2007-11-22 | 2009-05-27 | Naylor Concrete Products Ltd | Concrete lintel with fire resistant cementitious coating |
| GB2454893B (en) * | 2007-11-22 | 2009-10-14 | Naylor Concrete Products Ltd | Improvements to lintels |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6464780A (en) | 1981-08-27 |
| GB2063846B (en) | 1983-04-07 |
| AU537660B2 (en) | 1984-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921124 |