GB1584046A - Fibre-reinforced building board and its manufacture - Google Patents
Fibre-reinforced building board and its manufacture Download PDFInfo
- Publication number
- GB1584046A GB1584046A GB35501/77A GB3550177A GB1584046A GB 1584046 A GB1584046 A GB 1584046A GB 35501/77 A GB35501/77 A GB 35501/77A GB 3550177 A GB3550177 A GB 3550177A GB 1584046 A GB1584046 A GB 1584046A
- Authority
- GB
- United Kingdom
- Prior art keywords
- board
- cement
- dihydrate
- calcium sulphate
- caso4
- 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.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- 229910052925 anhydrite Inorganic materials 0.000 claims description 11
- 239000001913 cellulose Substances 0.000 claims description 11
- 229920002678 cellulose Polymers 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 10
- 150000004683 dihydrates Chemical class 0.000 claims description 10
- 239000012764 mineral filler Substances 0.000 claims description 8
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001175 calcium sulphate Substances 0.000 claims description 5
- 235000011132 calcium sulphate Nutrition 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 102000004169 proteins and genes Human genes 0.000 claims description 4
- 108090000623 proteins and genes Proteins 0.000 claims description 4
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 235000019738 Limestone Nutrition 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 238000010422 painting Methods 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 229920003043 Cellulose fiber Polymers 0.000 claims 1
- -1 ceyssatite Substances 0.000 claims 1
- 239000000945 filler Substances 0.000 claims 1
- 239000010440 gypsum Substances 0.000 description 5
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000010425 asbestos Substances 0.000 description 3
- 239000007767 bonding agent Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 239000010893 paper waste Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002699 waste material Substances 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
- C04B28/14—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 calcium sulfate cements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Producing Shaped Articles From Materials (AREA)
Description
(54) A FIBRE-REINFORCED, BUILDING BOARD AND ITS MANUFACTURE
(71) We, PARAISTEN KALKKI OY - PARGAS KALK AB, a Finnish Joint Stock
Company of 21600 Parainen, Finland, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to fibre-reinforced, building board and its manufacture.
It is known to manufacture fibre-reinforced building boards in which the bonding agent is cement or gypsum, the presence of resin or protein binders being undesirable for optimum fire resistance. When the manufacture takes place using asbestos-cement wet process machines, the fibres and the bonding agent are mixed with water to form a thin slurry, from which excess water must be removed during the manufacture of the board. This process has the advantage that large fibre quantities can be incorporated to form a product which is strong and tough. The alternative casting process commonly used for the manufacture of gypsum board has a drawback in that the incorporation of fibres into the product is difficult, and consequently its strength generally remains low.
The asbestos-cement processes require asbestos and cellulose, e.g., as waste paper, as fibre material. If, however, the cellulose content is increased substantially at the expense of the asbestos, or if only cellulose is used, the fire-resistant properties of the product obtained are considerably poorer than those of ordinary asbestos-cement-cellulose board. The board splits faster in a fire test.
In a board according to the present invention this disadvantage has been eliminated by adding gypsum (CaSO4.2H2O) to the board in addition to clement. In a fire the water of crystallisation liberated from the CaSO.2H20 cools the board and its slow speed of liberation retards the splitting of the board and thereby improves its fire-resistance.
Further, the CaSO.2H20 reduces the weight of the product and improves its machining properties so that the board can be machined using normal woodworking tools. Compared with ordinary gypsum board, the present product has considerably greater strength, tenacity and wet strength.
The invention accordingly provides a fibre-reinforced. building board comprising by weight 5-30C/o of organic or inorganic fibres, 10-70% of calcium sulphate dehydrate ()-204j of a mineral filler, and 10-80G/c of resin- and protein - free cement binder. the percentages being based on the total weight of the board.
A board according to the invention has, as a bonding agent, cement in an amount of 10 to 80% by weight. The board contains calcium sulphate dihydrate in an amount of 10 to 70% by weight, at least half of which. at the start of the manufacturing process. is preferably in hemihydrate form. CaSO4 . 1/2H,'O (Plaster of Paris). The manufacturing process is in that case sufficiently long for substantially all of the hemihvdrate to change, water being present, into the dihydrate before the board is made. However, the dihvdrate can be used directly, e.g. in the form of uncalcinated waste gypsum. making expensive calcination plants unnecessary.
The mineral fillers that can be used include limestone. fly ash, ceyssatite. slag. and quartz. in an amount (when used) of 5 to 2()' by weight.
The fibres can be cellulose. e.g. as waste paper, or asbestos or other organic or inorganic fibres such as rockwool. glasswool or glassflbre. or various type of plastics fibre. In such boards, in a fire the calcium sulphate dihydrate retards the splitting of the board and improves its fire-resistance.
The board can be manufactured by known asbestos-cement machines. The calcium sulphate is fed either together with the cement or separately into the stock mixer, from which the stock is further fed through a storage container, into a machine in which it is assembled, by a method known per se, into board of the desired thickness which can, if desired, be posteompressed.
The properties of products according to the invention are illustrated by the following
Examples.
Example I
Boards according to the invention were manufactured using a screw drum machine (Hatschek) normally used for the manufacture of asbestos-cement board. The composition used was as follows:
Cement 35%
CaSO4 . l/2H2O 50%
Cellulose 15% The properties of the product (in which the calcium sulphate hemihydrate had changed to the dihydrate) were: 28-day bending strength in feed direction 19.3 N/mm2
28-day bending strength in transverse direction 9.6 N/mm
Density 1119 kg/m
The boards could be machined using woodworking tools and the surface was ready for painting.
Example 2
The boards were manufactured as in Example 1. The composition was as follows:
Cement 28% CaSO4 1/2H20 42%
Cellulose 15% Mineral fillers 15%
The product obtained (in which the calcium hemihydrate had changed to the dihydrate) had the following properties:
Bending strength in fecd direction 26.1 N/mm
Bending strength in transverse direction 12.2 N/mm2 Density 1113 kg/m' Example 3
Test boards of 10 x 1()(1 x 2()() mm were made in a laboratory by filtering and compressing.
Boards were made with both hemihvdrate and dihydrate. the hemihydrate changing to the dihydrate during the process. The composition of the board was as follows:
Cement 60%
CaSO4.H2O or CaSO ,.2H,0 20% Cellulose 16% Mineral fillers 4%
The board obtained had the following properties:
CaSO4 . l/2H2O CaSO4 . 2H2O Bending strength N/mm 12.2 13.2 Densitv 1()67 1()84
WHAT WE CLAIM IS:
1. A fibre-reinforced. building board comprising bv weight 5-3()'ic of organic or inorganic fibres. 10-70% of calcium sulphate dihydrate. 0-20% of a mineral filler. and ll)-8()/r of resin - and protein - free cement binder. the percentages being based on the total
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
- **WARNING** start of CLMS field may overlap end of DESC **.The board can be manufactured by known asbestos-cement machines. The calcium sulphate is fed either together with the cement or separately into the stock mixer, from which the stock is further fed through a storage container, into a machine in which it is assembled, by a method known per se, into board of the desired thickness which can, if desired, be posteompressed.The properties of products according to the invention are illustrated by the following Examples.Example I Boards according to the invention were manufactured using a screw drum machine (Hatschek) normally used for the manufacture of asbestos-cement board. The composition used was as follows: Cement 35% CaSO4 . l/2H2O 50% Cellulose 15% The properties of the product (in which the calcium sulphate hemihydrate had changed to the dihydrate) were: 28-day bending strength in feed direction 19.3 N/mm228-day bending strength in transverse direction 9.6 N/mm Density 1119 kg/m The boards could be machined using woodworking tools and the surface was ready for painting.Example 2 The boards were manufactured as in Example 1. The composition was as follows: Cement 28% CaSO4 1/2H20 42% Cellulose 15% Mineral fillers 15% The product obtained (in which the calcium hemihydrate had changed to the dihydrate) had the following properties: Bending strength in fecd direction 26.1 N/mm Bending strength in transverse direction 12.2 N/mm2 Density 1113 kg/m' Example 3 Test boards of 10 x 1()(1 x 2()() mm were made in a laboratory by filtering and compressing.Boards were made with both hemihvdrate and dihydrate. the hemihydrate changing to the dihydrate during the process. The composition of the board was as follows: Cement 60% CaSO4.H2O or CaSO ,.2H,0 20% Cellulose 16% Mineral fillers 4% The board obtained had the following properties: CaSO4 . l/2H2O CaSO4 . 2H2O Bending strength N/mm 12.2 13.2 Densitv 1()67 1()84 WHAT WE CLAIM IS: 1.A fibre-reinforced. building board comprising bv weight 5-3()'ic of organic or inorganic fibres. 10-70% of calcium sulphate dihydrate. 0-20% of a mineral filler. and ll)-8()/r of resin - and protein - free cement binder. the percentages being based on the totalweight of the board.
- 2. A board according to claim 1 comprising 5-30% of cellulose fibres, 10-700/0 of calcium sulphate dihydrate, 0-20% of limestone, fly ash, ceyssatite, slag, or quartz, and 10-80% of cement.
- 3. A board according to claim 1 substantially as described in any one of the foregoing Examples 1 to 3.
- 4. A process for the manufacture of building board according to claim 1 which comprises mixing the required amounts of the fibres, calcium sulphate, filler (if any) and cement, at least half of the calcium sulphate being in the form of the hemihydrate, in the presence of water, and forming the board under conditions such that substantially all of the said hemihydrate is converted into the dihydrate.
- 5. A process according to claim 4 substantially as described in the foregoing Example 1, 2 or 3.
- 6. A process according to claim 4 wherein the board is formed on a machine including a screen drum, water being drained through the screen into the interior of the drum,
- 7. A building board produced by the process of claim 4, 5 or 6.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI762484A FI64935C (en) | 1976-08-30 | 1976-08-30 | FRAMSTAELLNING AV ASBESTFRI BRANDHAERDIG BYGGNADSPLATTA GENOM UPPRULLNINGSFOERFARANDE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1584046A true GB1584046A (en) | 1981-02-04 |
Family
ID=8510223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35501/77A Expired GB1584046A (en) | 1976-08-30 | 1977-08-24 | Fibre-reinforced building board and its manufacture |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT354026B (en) |
| DE (1) | DE2736971A1 (en) |
| FI (1) | FI64935C (en) |
| GB (1) | GB1584046A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3121248A1 (en) * | 1980-05-30 | 1982-06-16 | Osakeyhtiö Partek Ab, 21600 Parainen | PRODUCTION OF A BUILDING PLATE BY THE REWINDING PROCESS |
| GB2117753A (en) * | 1982-04-06 | 1983-10-19 | Printsulate Limited | Compositions |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI64130C (en) * | 1980-05-30 | 1983-10-10 | Partek Ab | RAOSKIVA FOER EN BYGGNADSSKIVA PAO GIPSBASIS SOM FRAMSTAELLS ENLIGT UPPRULLNINGSFOERFARANDET |
| DE3142096A1 (en) * | 1981-10-23 | 1983-05-11 | Chemische Fabrik Budenheim Rudolf A. Oetker, 6501 Budenheim | Fire-retarding insulating materials and process for producing them |
| DE3611080C1 (en) * | 1986-04-03 | 1987-01-29 | Raab Karcher Ag | Building components and process for their preparation and also of mixtures for repairing buildings and wooden parts |
| EP0270075B1 (en) * | 1986-12-04 | 1993-04-07 | Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. | Durable and highly stable moulded construction parts |
| DE4321024A1 (en) * | 1993-06-24 | 1995-01-05 | Haeussler Ingenieurbuero Gmbh | Process for producing lightweight concrete or concrete-like articles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5325339B2 (en) * | 1973-05-29 | 1978-07-26 | ||
| JPS50148424A (en) * | 1974-05-21 | 1975-11-28 |
-
1976
- 1976-08-30 FI FI762484A patent/FI64935C/en not_active IP Right Cessation
-
1977
- 1977-08-17 DE DE19772736971 patent/DE2736971A1/en active Granted
- 1977-08-24 GB GB35501/77A patent/GB1584046A/en not_active Expired
- 1977-08-29 AT AT622677A patent/AT354026B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3121248A1 (en) * | 1980-05-30 | 1982-06-16 | Osakeyhtiö Partek Ab, 21600 Parainen | PRODUCTION OF A BUILDING PLATE BY THE REWINDING PROCESS |
| GB2117753A (en) * | 1982-04-06 | 1983-10-19 | Printsulate Limited | Compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2736971C2 (en) | 1988-02-18 |
| DE2736971A1 (en) | 1978-03-02 |
| AT354026B (en) | 1979-12-10 |
| ATA622677A (en) | 1979-05-15 |
| FI64935B (en) | 1983-10-31 |
| FI762484A (en) | 1978-03-01 |
| FI64935C (en) | 1984-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |