WO2001087794A1 - Procede pour produire des structures composites a base de ciment - Google Patents

Procede pour produire des structures composites a base de ciment Download PDF

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Publication number
WO2001087794A1
WO2001087794A1 PCT/DK2001/000330 DK0100330W WO0187794A1 WO 2001087794 A1 WO2001087794 A1 WO 2001087794A1 DK 0100330 W DK0100330 W DK 0100330W WO 0187794 A1 WO0187794 A1 WO 0187794A1
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WO
WIPO (PCT)
Prior art keywords
hours
mixture
cement
temperature
typically
Prior art date
Application number
PCT/DK2001/000330
Other languages
English (en)
Inventor
Eigil Verner SØRENSEN
Bjarne Nissen Roursgaard
Original Assignee
Densit A/S
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 Densit A/S filed Critical Densit A/S
Priority to AU2001258236A priority Critical patent/AU2001258236A1/en
Publication of WO2001087794A1 publication Critical patent/WO2001087794A1/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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0263—Hardening promoted by a rise in temperature
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
    • C04B20/008—Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/2038—Resistance against physical degradation
    • C04B2111/2046—Shock-absorbing materials
    • 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

Definitions

  • the present invention relates to a method for producing cement-based composite structures suitable for use in safes, bank vaults, etc.
  • Such safes or vaults are constructed with a barrier that is difficult to penetrate with normal hand-held tools.
  • These security barriers are therefore constructed from materials with a high resistance to attack using tools such as sledge hammers, hammer and chisel, impact drills, diamond core drills, cutting torches and electric hammers.
  • tools such as sledge hammers, hammer and chisel, impact drills, diamond core drills, cutting torches and electric hammers.
  • such security barriers are composite constructions made with different types of steel plates and reinforcement and a hard matrix such as a high-strength concrete.
  • a typical construction comprises a front (outer) and back (inner) plate of a suitable quality steel, although some constructions have no front plate or no plates at all (being cast in a removable mould), a steel reinforcement and a matrix of e.g. a high-density, high-strength concrete.
  • the concrete may be based on a mixture comprising fine Portland cement particles, a relatively large amount of ultrafine particles such as silica fume particles, a relatively large amount of a concrete superplasticizer and a relatively small amount of water, e.g. as described in US 5,234,754. It may further contain a strong aggregate, e.g. calcined bauxite, as described in US 4,588,443.
  • the front and back plates may function as shutter boards for the matrix, and the front plate may be provided with an aesthetically pleasing outer surface.
  • a reinforcing mesh is often welded to the back plate in order to provide cooperation between the back plate and the matrix.
  • a wall construction of this type results in a stiffness that is useful when the wall is subjected to impact.
  • This type of wall construction is well known for use in e.g. vaults, safes and ATMs and is used by many manufacturers worldwide.
  • a general requirement for such wall constructions is that they are as thin and as lightweight as possible, i.a. because they are often used in multi-storey buildings with limited capacity of the elevators, and with a requirement to generally keep floor loads to a minimum.
  • a typical wall construction of this type has a thickness of about 30-400 mm and contains a reinforcing mesh. After arranging the mould or the steel wall construction comprising the metal plates and the reinforcing mesh, the mould or the space between the plates is filled with the matrix material mass. For relatively thin constructions of this type, the mass is typically based on either a high-strength concrete as referred to above or a synthetic resin.
  • Safes and vaults comprising this type of wall construction are often attacked in such a manner that a burglar removes the front sheet using a cutting torch, thereby exposing the outer surface of the matrix.
  • the attack is typically continued using one of the above mentioned tools.
  • the back plate and the reinforcement can then be cut away using a torch, thus providing access to the interior of the safe or vault.
  • the time required to penetrate the matrix depends on a combination of the stiffness of the overall construction and the strength and toughness of the matrix.
  • the burglary resistance of this type of construction can therefore be significantly improved by increasing the construction's thickness. As noted above, however, it is generally desired to decrease the wall thickness and weight, so improving the burglary resistance by making the walls thicker is in most cases disadvantageous and unsuitable in practice.
  • increased burglary resistance is preferably obtained by increasing the penetration resistance of the matrix material itself, i.e. the high strength concrete, rather than by simply increasing the wall thickness.
  • An additional consideration is that it is important that such wall structures can be produced relatively easily using production processes that are not prohibitively expensive.
  • US 4,780,141 discloses cementitious composite materials for use in the manufacture of molds and tools for forming metal and plastics.
  • the composite materials are prepared from a mixture of Portland cement, chemically reactive silica particles, inorganic oxide particles, e.g. ground crystalline silica or quartz, inorganic aggregate particles, e.g. steel particles, metal fibres and water.
  • Specimens were after casting treated in a saturated lime solution at 60°C for 24 hours, after which the treated specimens were air dried for a minimum of 5 days and then cured at elevated temperatures (mainly 150-350°C, but in some cases up to 815°C) in an oven.
  • elevated temperatures mainly 150-350°C, but in some cases up to 815°C
  • US 5,522,926 discloses a method for preparing high strength concrete elements from a mixture comprising Portland cement, fine sand, amorphous silica, ground quartz, metal fibres, steel wool, a dispersing agent and water. After setting, the concrete is cured at a temperature of not less than 250°C, and preferably not less than 400°C, in a high temperature curing sequence that typically lasts for a total of 10 days.
  • compositions similar to those of US 5,522,926 are disclosed in an article by Richard & Cheyrezy, two of the co-inventors of this US patent ("Composition of reactive powder concretes", Cement and Concrete Research, Vol. 25, No. 7, pp. 1501-1511 , 1995).
  • EP 0 010 777 also describes methods and products for producing cement-based materials, but also this document does not address any specially developed or applied methods for curing the products. Thus, the same comments as the above apply, i.e. as no specific curing is mentioned, the curing taking place must be only curing methods available to the person skilled in the art.
  • EP 0 692 464 describes cement-based products and this document actually also describes a specific method for curing of these. Curing takes place by elevating the temperature of the material during a certain period of time. Prior art is mentioned, where the temperature is elevated by means of autoclave curing up to 200°C. Heating above said temperature is not mentioned and heating by other means than steam is not mentioned.
  • the present invention relates to a method for producing a cement-based composite structure, comprising providing a mixture comprising fine particles of a cement binder having a size in the range of from about 0.5 to 100 ⁇ m, ultrafine particles having a size in the range of from about 5 nm to about 0.5 ⁇ m and water, and casting said mixture in a desired configuration followed by subjecting the cast mixture to a high temperature curing sequence comprising the following steps:
  • Composite structures produced according to the invention are suitable for use in any type of construction in which increased resistance to impact is desired. Such uses include, but are not limited to, safes and vaults, e.g. in banks, businesses and homes, strong rooms, shelters and armoured vehicles such as armoured cars. Particular examples of applications for which the composite structures are especially suitable are bank vaults and automatic teller machines.
  • composite structures of the invention will most often be used as a wall, or a part of a wall, for a safe, vault, strong room, etc., it will be understood that they are equally suitable for use as a floor, roof or door, in other words as a security barrier in general.
  • the cement particles in the mixture used according to the invention are fine particles having a size in the range of from about 0.5 to about 100 ⁇ m. These are combined with ultrafine particles having a size in the range of from about 5 nm to about 0.5 ⁇ m.
  • the average particle size of the ultrafine particles will be at least one order of magnitude smaller than the average size of the fine particles, thereby allowing the ultrafine particles to become substantially uniformly distributed in the voids between densely packed fine particles to result in an extremely hard and dense matrix that provides optimal resistance to penetration.
  • the fine particles will typically comprise at least one cement selected from the group consisting of Portland cement, low-alkali cement, sulphate-resistant cement, refractory cement, aluminate cement, slag cement and pozzolanic cement, and the ultrafine particles will typically comprise particles selected from the group consisting of silica fume and oxides such as iron oxide and titanium dioxide.
  • a matrix based on Portland cement and silica fume is especially preferred.
  • the matrix material will typically be prepared from a mixture comprising ultrafine particles in an amount of about 5-50% by volume based on the total volume of the fine particles and ultrafine particles in the mixture. More typically, the amount of ultrafine particles will be about 10-40% by volume, such as about 15-30% by volume, based on the total volume of the fine particles and ultrafine particles.
  • the amount of water is preferably kept to the minimum required in order to wet the particles and provide a mixture with the required workability.
  • Water is therefore normally added to the mixture in a volume ratio between water and fine+ultrafine particles of about 0.25-1.5, typically about 0.4-1.2, such as about 0.55-1.0.
  • the mixture When using a rather small amount of water as indicated above in a cement-based mixture, the mixture will typically be prepared using a suitable effective amount of a surface-active dispersing agent (also known as a water-reducing agent or plasticizer), preferably a dispersing agent of the type known in the art as "concrete superplasticizers".
  • a surface-active dispersing agent also known as a water-reducing agent or plasticizer
  • suitable concrete superplasticizers are naphthalene-based, melamine-based, vinyl-based, acrylic-based and carboxylic acid-based products, as well as mixtures thereof and derivatives such as vinyl copolymers.
  • the concrete superplasticizer or other dispersing agent is typically incorporated into mixture (either the dry mixture before water has been added or a wet mixture to which some or all of the water has already been added) in an amount of about 0.01-5% (dry weight based on the total weight of the fine and ultrafine particles), typically about 0.05- 4%, more typically about 0.1-3%, such as about 0.2-2%.
  • amount of superplasticizer to be used in each individual case will depend in part on the nature of the superplasticizer. For example, when using one of the new generation of highly effective vinyl-, acrylic- or carboxylic acid-based superplasticizers, the required dispersing effect can be obtained with a significantly smaller amount of superplasticizer than when using e.g.
  • the concrete superplasticizer should be used in an "effective" amount, i.e. effective for the given superplasticizer and in the given particle system to obtain the desired dispersing effect in the mixture using only the intended amount of water.
  • the matrix will typically further contain aggregate of a type known per se in the art, including metallic aggregate.
  • the aggregate is a strong and hard aggregate with a strength exceeding that of ordinary sand or stone used as aggregate for ordinary concrete.
  • strong aggregate particles include topaz, lawsonite, diamond, corundum, phenacite, spinel, beryl, chrysoberyl, tourmaline, granite, andalusite, staurolite, zircon, boron carbide, tungsten carbide, silicon carbide, alumina and bauxite.
  • a preferred strong aggregate material is calcined bauxite.
  • the matrix may in addition contain reinforcing bodies as is known in the art, in particular fibres or whiskers of any type suitable for use in concrete or mortar, for example steel fibres, organic fibres such as polypropylene fibres, glass or mineral fibres, inorganic non- metallic whiskers such as graphite whiskers, AI 2 O 3 whiskers or SiC whiskers, metallic whiskers such as iron or steel whiskers, etc.
  • reinforcing bodies as is known in the art, in particular fibres or whiskers of any type suitable for use in concrete or mortar, for example steel fibres, organic fibres such as polypropylene fibres, glass or mineral fibres, inorganic non- metallic whiskers such as graphite whiskers, AI 2 O 3 whiskers or SiC whiskers, metallic whiskers such as iron or steel whiskers, etc.
  • cement-based mixture and “matrix” are used interchangeably to refer to the combination of cement, ultrafine particles, water, fibres, aggregate, etc. which is mixed, cast and cured to form the composite structures of the invention.
  • composite structures of the invention comprising inner and/or outer metal plates and/or reinforcing bars, these may be of any suitable material, e.g. iron or steel.
  • the metal plates and the reinforcing bars will all be of a suitable grade of steel.
  • the reinforcing bars may optionally be wave-shaped bars as disclosed in European patent application No. 00610021.8.
  • Composite structures of the invention prepared from a mixture comprising cement particles, ultrafine particles and water, and typically further comprising a dispersing agent, fibres or whiskers and/or a strong aggregate, may be prepared in a manner known perse in the art, e.g.
  • the curing process itself comprises three basic steps, namely: 10
  • Heating typically takes place using a hot air oven, i.e. an oven with forced air circulation, and at ambient pressure.
  • a hot air oven i.e. an oven with forced air circulation
  • it is important that the heating is adjusted, taking into consideration both the nature and the dimensions of the cement- based mixture, so that steam explosions (explosive eruption) and heat-induced formation
  • the rate of temperature increase must in any given case be sufficiently slow so as to avoid these undesired effects.
  • One way of ensuring that that the rate of temperature increase is sufficiently slow is by making sure that the difference between the average temperature of the structure (defined as the average temperature of a cross-section of the structure) and the surface temperature of
  • the cast mixture does not exceed about 20°C.
  • this temperature difference should not be more than about 15°C, such as not more than about 12°C or 10°C.
  • phase (a) will typically last for a period of from about 2 to about 48 hours.
  • phase (a) is as short as possible, giving due consideration to the need to avoid possible damage to the cement-based matrix as a result of an excessively fast heating.
  • the duration of phase (a) is therefore preferably less than about 25 hours, more preferably less than about 20 hours, most preferably less than about 16 hours, such as from about 4 to 14 hours, e.g. from about 6 to about 12 hours.
  • This phase may also be divided into sub- phases, typically in which heating from room temperature to an intermediate elevated temperature of, e.g., about 80-100°C, takes place over a given number of hours, followed by maintaining the intermediate elevated temperature for, e.g., up to about 10 hours, such as about 0.5-5 hours, e.g. about 1-4 hours, and then by heating from the intermediate elevated temperature to a final elevated temperature. Maintaining the cement-based mixture at the intermediate elevated temperature promotes consumption of water due to the curing process, thus reducing the internal pressure and thereby the risk of explosive eruption.
  • an intermediate elevated temperature e.g., about 80-100°C
  • the maximum temperature in phase (a), generally corresponding to the temperature in phase (b), is typically in the range of about 150-300°C, such as about 200-280°C, e.g. about 240-260°C.
  • phase (b) the cast mixture is typically held at a substantially constant elevated temperature, i.e. the maximum temperature chosen for phase (a). It will be understood by persons skilled in the art, however, that a certain minor temperature fluctuation during phase (b) is acceptable. Although phase (b) may in certain cases last for up to about 72 hours, it is typically substantially shorter, i.e. up to about 48 hours, more typically up to about 24 hours, such as up to about 20 hours. Typically, phase (b) lasts for at least about 4 hours, such as at least about 8 hours. Phase (b) will thus often have a duration of about 2-16 hours, such as about 4-12 hours. As was the case for phase (a), a suitable duration for phase (b) in any given case will be able to be determined by persons skilled in the art based on factors such as the nature and dimensions of the material, including the thickness of the structure being produced.
  • the rate of cooling must be sufficiently slow so as to avoid the risk of crack formation due to excessively rapid cooling, but the cooling phase is otherwise preferably as short as possible.
  • This phase normally has a duration of at least about 2 hours, and it may in certain cases last for up to about 48 hours or more. Typically, however, it will have a duration of about 6-24 hours, such as about 8-22 hours, e.g. about 10-20 hours. It will be understood that there is no upper limit for the duration of this phase, which may in practice be as long as desired, e.g. if the oven being used is not immediately required for other purposes.
  • the curing sequence below illustrates some typical curing times and temperatures for the different phases that have been found to be advantageous for producing composite structures with a thickness of about 40-150 mm suitable for use e.g. as security barriers. It should be understood that this curing sequence is only provided by way of example, and that both the times and the temperatures of the curing sequence may in any given case be adapted in accordance with the general guidelines given elsewhere in the present specification.
  • the cast mixtures of the invention may be held at ambient conditions of temperature and pressure prior to the heat curing procedure.
  • the heat curing is initiated not more than about 10 days after casting, more preferably not more than about 7 days after casting, most preferably not more than about 5 days after casting. This is due to the fact that if too long a time at ambient temperature passes prior to the heat curing procedure, the compressive strength and penetration resistance may be adversely affected compared to the same material subject to heat curing shortly after casting. This is presumably due to structure formation having taken place in the cement-based matrix, thereby preventing the reactions which would otherwise occur at high temperature.
  • the total length of the curing sequence comprising steps (a), (b) and (c) is preferably not more than about 168 hours, more preferably not more than about 120 hours, more preferably not more than about 72 hours, still more preferably not more than about 60 hours, still more preferably not more than about 48 hours, such as not more than about 40 hours.
  • exposed surfaces of the composite structure may optionally be sealed with a layer impermeable to water vapour, e.g. a metal or plastic sheet or a vapour- impermeable polymer.
  • Inducast TT-5TM is a cement-based product of the type described above containing Portland cement, ultrafine silica fume particles, calcined bauxite (0-1 mm) and a concrete superplasticizer (available from Densit A/S, Denmark).
  • the casting mass was cast into cylindrical steel moulds having a diameter of 100 mm and a height of 200 mm.
  • the steel moulds were subsequently closed with a steel plate held in place with a clamp.
  • the closed steel cylinders with the samples were placed in a temperature-controlled oven and with a sufficient distance between the samples to allow oven air free access to all surfaces of the samples.
  • the oven door was closed and the samples were subjected to the following pre-programmed heat treatment: Heating from 20°C to 90°C 3 hours Constant oven temperature of 90°C 1 hour Heating from 90°C to 250°C 8 hours Constant oven temperature of 250°C 10 hours Cooling from 250°C to 20°C 15 hours
  • control samples were prepared as described above, but without being subjected to the heat treatment.
  • the control samples were cured at room temperature for 28 days. Following the 37 hour heat treatment or the 28 days at room temperature, respectively, the compressive strength of the treated and control samples were determined.
  • the samples subjected to a heat treatment in accordance with the invention were found to have a compressive strength of 330 MPa, while the control samples had a compressive strength of 208 MPa.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Dispersion Chemistry (AREA)
  • Nanotechnology (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un procédé pour produire des structures composites à base de ciment. Ce procédé consiste à mettre à disposition un mélange contenant des fines particules d'un liant de ciment, de dimensions comprises entre environ 0,5 et 100 νm, des particules ultrafines de dimensions comprises entre environ 5 nm et environ 0,5 νm, par ex. des fumées de silice, et de l'eau ; et à couler le mélange avant de le soumettre à une séquence de cuisson à haute température. A cet effet, (a) on fait chauffer le mélange coulé à une température inférieure à environ 300 °C pendant une période suffisamment longue pour éviter les explosions de vapeur et la formation de fissures, provoquées par la chaleur, dans la structure ; (b) on maintient le mélange coulé à une température élevée inférieure à 300 °C pour une période d'au moins deux heures environ ; et (c) on laisse le mélange coulé refroidir à température ambiante pendant une période suffisamment longue pour éviter la formation de fissures, provoquées par la chaleur, dans la structure composite.
PCT/DK2001/000330 2000-05-12 2001-05-10 Procede pour produire des structures composites a base de ciment WO2001087794A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001258236A AU2001258236A1 (en) 2000-05-12 2001-05-10 Method for producing cement-based composite structures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP00610047.3 2000-05-12
EP00610047 2000-05-12

Publications (1)

Publication Number Publication Date
WO2001087794A1 true WO2001087794A1 (fr) 2001-11-22

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007128630A1 (fr) * 2006-05-05 2007-11-15 Evonik Degussa Gmbh Utilisation d'une composition pulverulente comprenant du dioxyde de titane et un liant inorganique, destinee a augmenter la resistance initiale
WO2010118744A1 (fr) * 2009-04-17 2010-10-21 K-Consult Matériau en béton isolant à haute résistance
WO2011071884A3 (fr) * 2009-12-09 2011-10-13 The National Titanium Dioxide Co. Ltd. (Cristal) Béton résistant à la pénétration des ions chlorure et articles formés à partir dudit béton
CN108656328A (zh) * 2017-03-27 2018-10-16 北新集团建材股份有限公司 纤维水泥板的蒸压养护工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263723A2 (fr) * 1986-11-28 1988-04-13 Dansk Eternit-Fabrik A/S Procédé de fabrication de produits renforcés par des fibres
EP0273181A2 (fr) * 1986-12-23 1988-07-06 Cemcom Corporation Matériau de ciment contenant des fibres métalliques

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263723A2 (fr) * 1986-11-28 1988-04-13 Dansk Eternit-Fabrik A/S Procédé de fabrication de produits renforcés par des fibres
EP0273181A2 (fr) * 1986-12-23 1988-07-06 Cemcom Corporation Matériau de ciment contenant des fibres métalliques

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007128630A1 (fr) * 2006-05-05 2007-11-15 Evonik Degussa Gmbh Utilisation d'une composition pulverulente comprenant du dioxyde de titane et un liant inorganique, destinee a augmenter la resistance initiale
WO2010118744A1 (fr) * 2009-04-17 2010-10-21 K-Consult Matériau en béton isolant à haute résistance
WO2011071884A3 (fr) * 2009-12-09 2011-10-13 The National Titanium Dioxide Co. Ltd. (Cristal) Béton résistant à la pénétration des ions chlorure et articles formés à partir dudit béton
CN108656328A (zh) * 2017-03-27 2018-10-16 北新集团建材股份有限公司 纤维水泥板的蒸压养护工艺
CN108656328B (zh) * 2017-03-27 2019-10-11 北新集团建材股份有限公司 纤维水泥板的蒸压养护工艺

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