Patents Assigned to Lafarge
  • Binder for mine tailings, alluvial sand and the like
    Patent number: 7837412
    Abstract: A binder for mine tailings, alluvial sand and other aggregate used as a backfill for an underground void comprises ferrous slag, cement kiln dust and/or lime kiln dust, and Portland cement and/or lime; the binder displays strength characteristics better than or comparable to those achieved with conventional binders based on Portland cement or Portland cement and slag.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: November 23, 2010
    Assignee: LaFarge Canada Inc.
    Inventor: Brian O'Hearn
  • ADMIXTURE FOR HYDRAULIC BINDER
    Publication number: 20100273916
    Abstract: A method includes adding at least one copolymer or a salt thereof acting as a plasticizer, blocking agent, or both a plasticizer and a blocking agent, to a calcium sulphate-based hydraulic binder. The copolymer includes an acrylic acid or a poly(oxy)alkylene copolymer.
    Type: Application
    Filed: December 12, 2008
    Publication date: October 28, 2010
    Applicant: Lafarge Platres
    Inventors: Jean-Michel Faure, David Rinaldi, Horacio Naranjo
  • SOUND-ABSORBING, RESISTANT PANELS AND PROCESS FOR MAKING SAME
    Publication number: 20100272983
    Abstract: A composition includes a set hydraulic binder; and a foaming agent and has a porosity ?0.55; a flow resistivity between 10000 and 200000 N.s.m-4; a tortuosity between 1.2 and 3.4; a viscous characteristic length between 10 ?m and 60 ?m; a thermal characteristic length between 60 ?m and 1000 ?m; and a compressive strength of at least 0.30 MPa as measured by modified ASTM C472.
    Type: Application
    Filed: December 9, 2008
    Publication date: October 28, 2010
    Applicant: Lafarge Platres
    Inventors: Philippe Thouilleux, Claude Stock, Florence Yziquel, Pierre-Henri Jezequel
  • Method of manufacturing sheets based on hydraulic binder, production line for producing such sheets and apparatus for making an impression
    Patent number: 7790090
    Abstract: The invention relates to a method of manufacturing sheets based on hydraulic binder, particularly sheets of plasterboard with feathered edges. The method comprises the steps of (I) making a mark (301) on a facing (2 or 3) of the preform (5), (II) detecting the mark (301), and (III) sending an actuating signal to a device (9) for cutting the preform (5). The invention also relates to a production line for producing such sheets, and to an apparatus, particularly for making an impression (12, 12bis) in a preform (5). The apparatus comprises a frame (101), first (102, 103) and second (105, 106) pulleys, two belts (108, 109) wrapped around the pulleys (102, 103, 105, 106), and at least one wire (111) extending between these belts (108, 109) so that its axis is parallel to the axis of the pulleys (102, 103, 105, 106).
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: September 7, 2010
    Assignee: Lafarge Platres
    Inventors: Paul Jallon, Michel Rigaudon, Jean Louis Laurent, Jean Paul Solomut
  • FORMULATION, UTILISATION AND PROCESS TO OBTAIN A LIGHTWEIGHT STRUCTURAL CONCRETE
    Publication number: 20100212551
    Abstract: A lightweight structural concrete includes a hydraulic binder; effective water; a superplasticizer; and aggregates; the concrete having a density in the fresh state varying from 1.40 to a Dmax value calculated according to formula (I) Dmax=1.58+(a×AM) in which “a” represents a coefficient for which the value is equal to 1; “AM” represents the mass percentage of the amorphous materials contained in 1 m3 of fresh concrete; the concrete having a maximum fresh state density Dmax less than or equal to 1.85; the concrete having a Weffective/L ratio varying from 0.19 to 0.
    Type: Application
    Filed: October 10, 2008
    Publication date: August 26, 2010
    Applicant: LAFARGE
    Inventors: Sylvain Meille, Emmanuel Bonnet, Gilles Chanvillard, Arnaud Schwartzentruber
  • Hydraulic mineral composition, production method thereof and hydraulic binders and cementitious products containing one such composition
    Patent number: 7771507
    Abstract: The invention relates to a hydraulic mineral composition which is characterized in that it comprises a vitreous or crystallised matrix based on magnesium and calcium silico-aluminates which represent at least 25 wt.-%, and preferably 30 wt.-%, of the composition, one or more mineral oxides and optionally one or more specific mineral halides which are selected from among the oxides and halides of Ti, V, Cr, Mn, Co, Ni, Cu, Pb, Ba, Sr, P, S, Na, K, Zr, Mo, Be, Tl, As, Sn and Cd and which represent at least 5 wt.-% of the composition, at most 31 wt.-% alumina (Al2O3), less than 10 wt.-% ferrite, and less than 0.05 wt.-%, and preferably less than 0.01 wt.-%, C in relation to the weight of the composition.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: August 10, 2010
    Assignee: LaFarge
    Inventors: François Sorrentino, Michel Gimenez
  • Method for producing a work, jointing and surfacing compound for structural elements and its method of preparation
    Patent number: 7759416
    Abstract: The invention relates to a sealant compound comprising, in weight percent relative to the compound total volume: 40-60% of mineral filler whose diameter d50 ranges from 5 to 20 microns, 5-10% of hydrophobic expanded perlite whose diameter d50 ranges from 20 to 100 microns and 4-20% of binder. A method for preparing the inventive compound is also disclosed. Said invention also relates to producing a work provided with joints made of pointing and/or surfacing compound by applying said compound and/or pointing and surfacing by applying the compound which is characterised in that the compound is applied by airless process. According to the inventive method, said sealant compound is embodied such as described in the invention.
    Type: Grant
    Filed: May 4, 2005
    Date of Patent: July 20, 2010
    Assignee: Lafarge Platres
    Inventor: Claude Liling
  • Apparatus for stabilizing plaster
    Patent number: 7748888
    Abstract: A process for stabilizing plaster includes: a) providing a heated HH-plaster; b) feeding the hot plaster in a moistening device having walls heated to at least 100° C.; c) injecting water and/or steam into the moistening device in conditions that such not yet moistened surfaces of the plaster are exposed to the injected water and/or steam; d) maintaining an atmosphere in the moistening device at a level of the dew point in the range of 75 to 99° C.; e) feeding the moistened blend into a curing device; f) maintaining an atmosphere in the curing device above 75° C. for at least 3 minutes; g) feeding the moistened and cured blend into a drying device; and h) drying the moistened and cured blend. Also an apparatus for moistening ?-hemihydrate plaster includes a rotating drum with lifting blades inside where all walls in contact with the product are externally heated at a temperature above 100° C.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: July 6, 2010
    Assignee: Lafarge Platres
    Inventor: Joerg Bold
  • HIGH BELITE-CONTAINING SULFOALUMINOUS CLINKER, METHOD FOR THE PRODUCTION AND THE USE THEREOF FOR PREPARING HYDRAULIC BINDERS
    Publication number: 20100132590
    Abstract: A sulphoaluminate clinker includes as a phasic formulation, compared with the total weight of clinker: 5 to 25% of a calcium aluminoferrite phase with a formulation corresponding to the general formula C2AXF(1?X), with X comprised between 0.2 and 0.8; 15 to 35% of a calcium sulphoaluminate phase yee' limit (C4A3$); 40 to 75% belite (C2S); from 0.01 to 10% of one or several minor phases selected from the group consisting of calcium sulphates, alkali sulphates, perovskite, calcium aluminates, gehlenite, free lime and periclase, and/or a vitreous phase, and additives including at least sodium and boron present in the following quantities, by weight as compared to the total weight of the clinker: from 0.1 to 5% of sodium expressed as sodium oxide and from 0.2 to 3% of boron, expressed as boron oxide, the total content of said additives being less than or equal to 15%.
    Type: Application
    Filed: June 29, 2009
    Publication date: June 3, 2010
    Applicant: LAFARGE
    Inventors: Ellis Gartner, Guanshu Li
  • PROCESS TO REDUCE THE AMOUNT OF Cr (VI) IN A CEMENT-CONTAINING COMPOSITION AND A COMPOSITION COMPRISING CEMENT AND COATED METALLIC SULPHATE PARTICLES
    Publication number: 20100116173
    Abstract: A method for producing a cement-containing material having a low content of soluble Cr (VI), the method including providing a cement-containing material with metallic sulphate particles coated with at least one product of the hydrolysis of a collagen material.
    Type: Application
    Filed: May 6, 2008
    Publication date: May 13, 2010
    Applicant: LAFARGE
    Inventors: Hélène Debegnac, Christelle sing
  • Apparatus and method for feeding materials to a cement mill
    Patent number: 7699930
    Abstract: A flow enhanced calcium sulfate product includes a calcium sulfate source material, such as a flue gas desulphurization by-product, is pre-blended with a granular feedstock exhibiting good cementitious properties. The flow enhanced calcium sulfate is fed to a cement mill where it is combined with clinker during a finishing grinding process for portland cement. The flow enhanced calcium sulfate exhibits good flowability without changing the properties of the cement.
    Type: Grant
    Filed: November 21, 2006
    Date of Patent: April 20, 2010
    Assignee: LaFarge North America
    Inventors: Horace H. Compton, Nathan A. Fernow, Ajay Joshi
  • Gypsum board and systems comprising it
    Patent number: 7700505
    Abstract: The invention relates to a new plasterboard having a facer comprising two plies, and uses of such plasterboards in EIS or EFS.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: April 20, 2010
    Assignee: Lafarge Platres
    Inventors: Claude Leclercq, Steven Roy Butler
  • PROCESS FOR TREATING CONCRETE
    Publication number: 20100068401
    Abstract: A method of treating a concrete surface to render it less susceptible to undesired staining or marking, the method comprising contacting the surface with an aqueous solution comprising a water soluble polyphosphate of a monovalent or divalent cation.
    Type: Application
    Filed: October 30, 2007
    Publication date: March 18, 2010
    Applicant: LAFARGE
    Inventors: Jean-Francois Batoz, Christian Vernet, Michel Vanhove, Fabienne Begaud
  • CONCRETE COMPOSITIONS
    Publication number: 20100043673
    Abstract: A concrete which includes in parts by weight: 100 Portland cement; 50 to 200 of a sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D10 to D90 between 0.063 and 1 mm and the coarsest sand having a D10 to D90 between 1 and 4 mm; 10 to 50 of a particulate, substantially non-pozzolanic material having a mean particle size less than 15 ?m; 0.1 to 10 of a water-reducing superplasticizer; and 10 to 30 of water; which concrete is substantially free of silica fume; the concrete having a compressive strength greater than 100 Mpa at 28 days.
    Type: Application
    Filed: January 23, 2008
    Publication date: February 25, 2010
    Applicant: LAFARGE
    Inventors: Jean-François Batoz, Mouloud Behloul, Philippe Fonollosa
  • COATED GYPSUM BOARD PRODUCTS AND METHOD OF MANUFACTURE
    Publication number: 20100047461
    Abstract: A method of producing a coated gypsum board includes depositing a gypsum slurry to form a wet gypsum board having a gypsum core; applying a coating to the wet gypsum board; and drying the wet gypsum board, wherein the step of applying the coating occurs prior to the step of drying and the coating penetrates through at least a portion of the facing sheet and into at least a portion of the gypsum core. A board produced by the method is made with a coating that matches a joint compound.
    Type: Application
    Filed: November 2, 2009
    Publication date: February 25, 2010
    Applicant: LAFARGE PLATRES
    Inventor: Elizabeth A. Colbert
  • PROCESS FOR THE PRODUCTION OF CEMENT
    Publication number: 20100037804
    Abstract: The invention provides a process for the production of cement which comprises the calcination of calcium carbonate-containing raw meal in a calciner heated by combustion of a carbon-containing fuel with a gas comprising oxygen and from 0 to 80% by volume of carbon dioxide, and substantially free of nitrogen, and isolating the gas produced by combustion and calcination in the calciner.
    Type: Application
    Filed: October 30, 2007
    Publication date: February 18, 2010
    Applicant: LAFARGE
    Inventors: Colin Paxton, Michael Weichinger
  • Device for drying and/or calcining gypsum
    Patent number: 7651565
    Abstract: A gypsum dryer/calciner (1) includes a calcining space (2), a first pipe (4) exhibiting an inlet connected to a source of hot gases (3) and an outlet emerging in the calcining space (2); a second pipe (5) exhibiting an inlet connected to a source of gypsum (8) and an outlet emerging in the calcining space, the second pipe being concentric with the first pipe; a force-feeding screw (6) positioned at least partially in the second pipe, the said screw carrying the gypsum along in the calcining space. A process for calcining gypsum and to the plaster capable of being obtained by this process.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: January 26, 2010
    Assignee: Lafarge Platres
    Inventor: Charles Falinower
  • Production line for producing sheets based on hydraulic binder and method of manufacturing the same
    Patent number: 7651327
    Abstract: A production line for producing sheets based on hydraulic binder, the production line including in an upstream zone of the production line, marking device for marking a facing material of the preform with a mark; in a downstream zone of the production line, detecting device for detecting the mark made by the marking device; a cutting device; and an actuating device for actuating said cutting device after receiving a detection signal from the detection device.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: January 26, 2010
    Assignee: Lafarge Platres
    Inventors: Paul Jallon, Michel Rigaudon, Jean Louis Laurent, Jean Paul Solomut
  • MOULDING DEVICE AND PRODUCTION PROCESS
    Publication number: 20090309272
    Abstract: A production process includes providing an envelope and a mould, introducing the material to be moulded in the mould, placing the mould in the envelope, creating a low pressure in the envelope, and deforming the mould.
    Type: Application
    Filed: October 30, 2007
    Publication date: December 17, 2009
    Applicant: LAFARGE
    Inventors: Mouloud Behloul, Sylvain Quidant
  • DEVICE AND METHOD FOR THE PRODUCTION OF A WATER BARRIER IN AN UNHARDENED ROOF TILE
    Publication number: 20090309263
    Abstract: The invention relates to a device and a method for producing a water barrier in unsolidified roof tile preforms. The inventive device comprises a molded piece with a recess as well as a die. The molded piece is disposed above the end of a roof tile perform, whereupon all or part of the rear edge of the roof tile perform is pressed upward by means of the die. The roof tile perform is then dried.
    Type: Application
    Filed: March 7, 2006
    Publication date: December 17, 2009
    Applicant: LAFARGE ROOFING TECHNICAL CENTERS GMBH
    Inventors: Peter Srostlik, Günter Weiss