WO1992011217A1 - Materiaux renforces par des fibres - Google Patents

Materiaux renforces par des fibres Download PDF

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Publication number
WO1992011217A1
WO1992011217A1 PCT/EP1991/002464 EP9102464W WO9211217A1 WO 1992011217 A1 WO1992011217 A1 WO 1992011217A1 EP 9102464 W EP9102464 W EP 9102464W WO 9211217 A1 WO9211217 A1 WO 9211217A1
Authority
WO
WIPO (PCT)
Prior art keywords
polymethylpentene
cementitious material
autoclaved
uncured
uncured cementitious
Prior art date
Application number
PCT/EP1991/002464
Other languages
English (en)
Inventor
Robert Alexander Carroll
Original Assignee
Marley Building Materials Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Marley Building Materials Limited filed Critical Marley Building Materials Limited
Publication of WO1992011217A1 publication Critical patent/WO1992011217A1/fr

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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
    • C04B28/18—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 mixtures of the silica-lime type
    • 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
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04—Macromolecular compounds
    • C04B16/06—Macromolecular compounds fibrous
    • C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B16/0625—Polyalkenes, e.g. polyethylene

Definitions

  • This invention relates to novel fibre-reinforced cementitious materials, more particularly to steam autoclaved, hydraulically bound materials reinforced with certain polyolefinic fibres.
  • suitably formulated cementitious materials may be steam autoclaved to accelerate the hydrothermal reactions between the silica and lime contents, leading to the formation of stable crystalline or semi-crystalline calcium silicate hydrates (or calcium alumino-silicate hydrates if a source of aluminium ions is present so that hydrothermal reactions may occur between the alumino-silicate and lime contents) with useful binding properties.
  • useful properties such as good compressive strength, good chemical resistance, low drying shrinkage and/or reduced susceptibility to frost damage, either in the form of dense, low porosity products or as lighter, cellular structures.
  • fibrous forms of the polymer polymethylpentene when incorporated in aqueous cementitious compositions are substantially inert under autoclaving conditions despite the combination of high temperature and high alkalinity which is encountered and that such compositions can be used to produce autoclaved products having enhanced tensile properties, e.g. as evidenced by improved saturated modulus of rupture and/or by improved handling properties, for example as shown by a reduced tendency for products such as blocks to suffer chipping or breakage.
  • Polymethylpentene which is marketed under the tradename TPX by Mitsui Co. of Japan, is obtained by polymerisation of 4-methylpent-l-ene and contains the repeating unit
  • Units derived from one or more comonomers e.g. other ⁇ -olefines such as ethylene, propylene, but-1-ene or hex-1-ene may also be present at levels which do not detract from the stability of the polymer.
  • Fibrous forms of polymethylpentene materials which may be used in accordance with the invention include individual fibre filaments, fibre bundles, sheets of non-woven or woven fabrics, matting and other net-like structures.
  • the use of short, flexible fibres e.g. 2- 10mm staple length, conveniently about 5mm
  • the polymethylpentene fibre content of materials according to the invention may, for example, be in the range 0.5-5.0% w/w, preferably 1.0-2.5% w/w.
  • a process which comprises autoclaving an uncured cementitious material containing fibrous polymethylpentene, e.g. by steam autoclaving at a temperature in the range of 170-210"C, for example for a time of 2-24 hours.
  • Sand and/or other siliceous materials and/or conventional additives and processing aids such as calcium sulphate, gassing and foaming agents, foam stabilising agents, additional alkalies, plasticisers, dispersants, accelerators, retarders and/or viscosity modifiers may additionally be employed if desired for particular applications.
  • Preferred reactive silica sources include pozzolans such as pulverised fuel ash, volcanic ash, slags (e.g. blast furnace slag) , pumicite, opaline shales and cherts, calcined diatomaceous earth, burnt clay, calcined rice husks and silica fume. Finely ground quartz may also be employed since it exhibits sufficient solubility under autoclaving conditions to constitute an effective silica source. Where appropriate, slags may be activated by addition of aqueous alkalies such as sodium hydroxide or sodium carbonate.
  • aqueous alkalies such as sodium hydroxide or sodium carbonate.
  • calcareous materials capable of providing lime include hydraulic cements (e.g. portland cement, modified portland cement, lime-pozzolan cement, natural cement or slag cement) , hydraulic lime, quicklime and hydrated lime.
  • hydraulic cements e.g. portland cement, modified portland cement, lime-pozzolan cement, natural cement or slag cement
  • hydraulic lime quicklime and hydrated lime.
  • the uncured material may, for example, comprise a slurry, paste or moist powder into which the polymethylpentene fibres may be incorporated directly or after being predispersed in water.
  • the resulting uncured composite material may be subjected to manufacturing processes such as casting, pressure moulding, gravity moulding, extrusion, slip casting, vacuum forming, electrophoretic deposition and/or cutting prior to autoclaving. Processes such as casting may conveniently be effected at elevated temperature, e.g. in the range 35-55 ⁇ C; such temperatures may initially be achieved by, for example, using warm or hot water to prepare the uncured material and/or as a result of exothermic reactions involving the calcareous materials.
  • a cellular material such as autoclaved aerated concrete
  • this may be effected by, for example, air entrainment, incorporation of a preformed foam or addition of a gassing or foaming agent (e.g. a protein-based foaming agent) to the uncured material.
  • a gassing or foaming agent e.g. a protein-based foaming agent
  • Finely divided aluminium powder is a preferred example of a gassing agent which can usefully be employed under the alkaline conditions existing in cementitious mixtures.
  • Polymethylpentene fibres in the amounts stated in Table 1 were predispersed in water (3350g to 3370g) over about 5 minutes, and to this dispersion were sequentially added pulverised fuel ash (4420g) , ordinary portland cement (2084g) , quicklime (503g) and anhydrite (180g) , ensuring adequate dispersion of each raw material.
  • Aluminium powder (7g) dispersed in a small quantity of water was added to the resulting slurry, which was vigorously mixed for about 15 seconds and cast at a temperature of 45 ⁇ C into oiled steel moulds.
  • the expanded articles were demoulded after 180-240 minutes, by which time the temperature had risen to 65-70 ' C as a result of exothermic reactions occurring, and were thereafter subjected to an autoclave cycle comprising a 30 minute steam purge, 120 minutes pressurisation to 184"C, 360 minutes dwell at 184 ⁇ C and 120 minutes depressurisation.
  • Polymethylpentene fibres in the amounts stated in Table 2 were predispersed in water (4400 to 4550g) over about 5 minutes, and to this dispersion were sequentially added pulverised fuel ash (6688g) , ordinary portland cement (1460g) , quicklime (708g) and anhydrite (49g) , ensuring adequate dispersion of each raw material.
  • Aluminium powder (5g) dispersed in a small quantity of water was added to the resulting slurry, which was vigorously mixed for about 15 seconds and cast at a temperature of 45 ⁇ C into oiled steel moulds.
  • the expanded articles were demoulded after 180-240 minutes, by which time the temperature had risen to 65-70*C as a result of exothermic reactions occurring, and were thereafter subjected to an autoclave cycle comprising a 30 minute steam purge, 120 minutes pressurisation to 184 °C, 360 minutes dwell at 184*C and 120 minutes depressurisation.
  • Polymethylpentene fibres (2.6 kg) were prewetted with water (13.6 kg). The mixer was charged simultaneously with warm water (104 kg) and moist process waste* (151 kg) . Pulverised fuel ash (271 kg) , ordinary portland cement (31.4 kg), quicklime (38.2 kg) and anhydrite (8.9 kg) were sequentially added ensuring adequate dispersion of each raw material. The prewetted fibres were added to the mixer and allowed to disperse for 60 seconds. Aluminium powder (350g) predispersed in water (2 kg) was added to the slurry which was mixed for a further 15 seconds and cast at a temperature of 46 * C into oiled steel moulds.
  • the expanded articles were demoulded after 75 minutes by which time the internal temperature had reached 75 to 80 ⁇ C.
  • the single mass was cut into numerous blocks by a series of reciprocating steel wires and thereafter subjected to an autoclave cycle of 30 minutes steam purge, 60 minutes pressurisation to 184*C, 360 minutes dwell at 184*C and 60 minutes depressurisation.
  • Fibre-reinforced autoclaved aerated concrete products so obtained exhibited a saturated modulus of rupture of 1.13 N/mm 2 compared to 1.03 N/mm 2 shown by corresponding non-reinforced control samples.
  • Moist process waste is uncured material trimmed off the risen mass at the cutting stage. It contains all the components of the mix itself and approximately 25% moisture.
  • Polymethylpentene fibres (98g) were predispersed in water (2600g) in a planetary mixer fitted with a "basket” whisk.
  • a protein-based foaming agent ("Protifoam PC", supplied by Enborne Foods Limited,
  • Reading, Berkshire, England - 45g was added and mixing continued for about 5 minutes.
  • Pulverised fuel ash (7672g) was slowly added to produce a foamed slurry and mixing continued for about 5 minutes.
  • Ordinary portland cement (1400g) , quicklime (708g) and anhydrite (49g) were sequentially added, ensuring adequate dispersion of each raw material. Further water (lOOOg) was incorporated during the addition of the raw materials to maintain a smooth foamed slurry.
  • Mixing was continued for about 5 minutes and the foamed slurry was cast into oiled steel moulds.
  • the foamed articles were demoulded after 12 hours and subjected to an autoclave cycle of 30 minutes steam purge, 120 minutes pressurisation to 184 ⁇ C, 360 minutes dwell at 184'C and 120 minutes depressurisation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Les propriétés mécaniques à la traction de matériaux cimentaires liés hyrauliquement et passés à l'autoclave, tels que du béton aéré et passé à l'autoclave, sont améliorées par l'incorporation de polyméthylpentène fibreux dans le matériau cimentaire non durci, avant le passage à l'autoclave.
PCT/EP1991/002464 1990-12-20 1991-12-19 Materiaux renforces par des fibres WO1992011217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9027601.5 1990-12-20
GB909027601A GB9027601D0 (en) 1990-12-20 1990-12-20 Fibre-reinforced materials

Publications (1)

Publication Number Publication Date
WO1992011217A1 true WO1992011217A1 (fr) 1992-07-09

Family

ID=10687294

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/002464 WO1992011217A1 (fr) 1990-12-20 1991-12-19 Materiaux renforces par des fibres

Country Status (2)

Country Link
GB (1) GB9027601D0 (fr)
WO (1) WO1992011217A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4418310A1 (de) * 1994-05-26 1995-11-30 Ahg Baustoffhandelsgesellschaf Verfahren zur Herstellung von Porenbetonkörpern
EP1069090A1 (fr) * 1999-07-15 2001-01-17 Ytong Holding GmbH Béton-mousse renforcé par des fibres et son procédé de fabrication
EP1069089A1 (fr) * 1999-07-15 2001-01-17 Ytong Holding GmbH Béton cellulaire renforcé par des fibres et son procédé de fabrication
WO2004007393A1 (fr) * 2002-07-16 2004-01-22 Lohrmann Horst Dr Procede de production de beton cellulaire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2025841A (en) * 1978-07-07 1980-01-30 Mitsui Petrochemical Ind Reinforcing material for hydraulic substances and method for the production thereof
EP0064167A1 (fr) * 1981-04-30 1982-11-10 Allied Corporation Procédé pour la fabrication d'un article thermoplastique cristallin ayant une haute ténacité et un module élevé et produits fibreux fabriqués utilisant le procédé
EP0211252A1 (fr) * 1985-07-08 1987-02-25 Mitsubishi Rayon Company, Ltd. Articles durcis renforcés par des fibres
GB2211183A (en) * 1987-10-19 1989-06-28 Courtaulds Plc Cement composition
JPH02199046A (ja) * 1989-01-27 1990-08-07 Daiwabo Co Ltd 繊維強化セメント成形体
JPH0327113A (ja) * 1989-06-23 1991-02-05 Daiwabo Co Ltd ポリオレフイン繊維及びその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2025841A (en) * 1978-07-07 1980-01-30 Mitsui Petrochemical Ind Reinforcing material for hydraulic substances and method for the production thereof
EP0064167A1 (fr) * 1981-04-30 1982-11-10 Allied Corporation Procédé pour la fabrication d'un article thermoplastique cristallin ayant une haute ténacité et un module élevé et produits fibreux fabriqués utilisant le procédé
EP0211252A1 (fr) * 1985-07-08 1987-02-25 Mitsubishi Rayon Company, Ltd. Articles durcis renforcés par des fibres
GB2211183A (en) * 1987-10-19 1989-06-28 Courtaulds Plc Cement composition
JPH02199046A (ja) * 1989-01-27 1990-08-07 Daiwabo Co Ltd 繊維強化セメント成形体
JPH0327113A (ja) * 1989-06-23 1991-02-05 Daiwabo Co Ltd ポリオレフイン繊維及びその製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
WORLD PATENTS INDEX LATEST Week 9037, Derwent Publications Ltd., London, GB; AN 90-280277 & JP,A,02 199 046 (DAIWA SPINNING K.K.) 7 August 1990 *
WORLD PATENTS INDEX LATEST Week 9112, Derwent Publications Ltd., London, GB; AN 91-082836 & JP,A,03 027 113 (DAIWA SPINNING K.K.) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4418310A1 (de) * 1994-05-26 1995-11-30 Ahg Baustoffhandelsgesellschaf Verfahren zur Herstellung von Porenbetonkörpern
WO1995032928A1 (fr) * 1994-05-26 1995-12-07 Ahg Baustoffhandelsgesellschaft Mbh Procede de production de corps en beton poreux
EP1069090A1 (fr) * 1999-07-15 2001-01-17 Ytong Holding GmbH Béton-mousse renforcé par des fibres et son procédé de fabrication
EP1069089A1 (fr) * 1999-07-15 2001-01-17 Ytong Holding GmbH Béton cellulaire renforcé par des fibres et son procédé de fabrication
DE19933297A1 (de) * 1999-07-15 2001-01-18 Ytong Holding Gmbh Faserarmierter Porenbeton sowie Verfahren zu seiner Herstellung
DE19933297C2 (de) * 1999-07-15 2001-10-04 Ytong Holding Gmbh Faserarmierter Porenbeton sowie Verfahren zu seiner Herstellung
WO2004007393A1 (fr) * 2002-07-16 2004-01-22 Lohrmann Horst Dr Procede de production de beton cellulaire

Also Published As

Publication number Publication date
GB9027601D0 (en) 1991-02-13

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