Patents Assigned to Lafarge Canada Inc.
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Patent number: 9231394Abstract: A cross arm is provided, for use in a support structure for conductors within an electrical grid. The cross arm is made of a cementitious composite and has a rough āCā cross sectional shape. Pairs of the cross arms are attached to utility poles in a parallel position on opposite sides of the utility pole. Alternatively, a single cross arm may be attached to a utility pole. Embedded metal or glass fiber reinforced polymer bars extend along the length of the cross arms.Type: GrantFiled: June 22, 2012Date of Patent: January 5, 2016Assignees: BRITISH COLUMBIA HYDRO AND POWER AUTHORITY, LAFARGE CANADA INC.Inventors: Juan Ignacio Cariaga Crespo, Adelana R. Gilpin-Jackson
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Patent number: 9194095Abstract: The present invention discloses a unitized precast grillage foundation for supporting a structure comprising: a plurality of anchoring elements defining a grid for resting on an underlying surface; a base connected on the grid, the base comprising at least a first footing and a second footing spaced apart and at least one connecting member between and connected to the at least first footing and the second footing; and a beam-column projecting upwardly from the base, and a method of making same.Type: GrantFiled: September 17, 2014Date of Patent: November 24, 2015Assignee: LAFARGE CANADA INC.Inventors: Juan Ignacio Cariaga, Don Zakariasen
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Patent number: 8863455Abstract: The present invention discloses a unitized precast grillage foundation for supporting a structure comprising: a plurality of anchoring elements defining a grid for resting on an underlying surface; a base connected on the grid, the base comprising at least a first footing and a second footing spaced apart and at least one connecting member between and connected to the at least first footing and the second footing; and a beam-column projecting upwardly from the base, and a method of making same.Type: GrantFiled: October 11, 2012Date of Patent: October 21, 2014Assignee: Lafarge Canada Inc.Inventors: Juan Ignacio Cariaga, Don Zakariasen
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Publication number: 20140102025Abstract: The present invention discloses a unitized precast grillage foundation for supporting a structure comprising: a plurality of anchoring elements defining a grid for resting on an underlying surface; a base connected on the grid, the base comprising at least a first footing and a second footing spaced apart and at least one connecting member between and connected to the at least first footing and the second footing; and a beam-column projecting upwardly from the base, and a method of making same.Type: ApplicationFiled: October 11, 2012Publication date: April 17, 2014Applicant: LAFARGE CANADA INC.Inventors: Juan Ignacio CARIAGA, Don ZAKARIASEN
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Patent number: 8177908Abstract: 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: GrantFiled: October 8, 2010Date of Patent: May 15, 2012Assignee: Lafarge Canada Inc.Inventor: Brian O'Hearn
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Publication number: 20110139503Abstract: A cross arm is provided, for use in a support structure for conductors within an electrical grid. The cross arm is made of a cementitious composite and has a rough āCā cross sectional shape. Pairs of the cross arms are attached to utility poles in a parallel position on opposite sides of the utility pole. Alternatively, a single cross arm may be attached to a utility pole. Embedded metal or glass fibre reinforced polymer bars extend along the length of the cross arms.Type: ApplicationFiled: December 11, 2009Publication date: June 16, 2011Applicants: British Columbia Transmission Corporation, Lafarge Canada Inc.Inventors: Juan Ignacio CARIAGA CRESPO, Adelana R. GILPIN-JACKSON, Janos Csaba TOTH
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Publication number: 20110023756Abstract: 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: ApplicationFiled: October 8, 2010Publication date: February 3, 2011Applicant: LAFARGE CANADA INC.Inventor: Brian O'Hearn
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Patent number: 7837412Abstract: 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: GrantFiled: February 12, 2007Date of Patent: November 23, 2010Assignee: LaFarge Canada Inc.Inventor: Brian O'Hearn
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Patent number: 7610801Abstract: A method and device allows determination of the flow rate of solids material, under gravity, in an elongate vertical pipe; the device comprises a flow head chamber having an inlet end and an outlet end, an elongate tubular neck extending from the outlet end, the neck having an exit port remote from the outlet end, and the head chamber having an interior wall means converging from the inlet end to the outlet end, and the chamber being in flow communication with the elongate tubular neck such that in a vertically oriented configuration with the inlet end uppermost, the exit port lowermost and the elongate tubular neck disposed downwardly, solids material housed in the device may flow under gravity from the chamber into the elongate tubular neck towards the exit port; in one embodiment the device has plug means adapted to releasably engage the exit port to temporarily close the exit port; in another embodiment the chamber has a volume capacity for the solids material which permits the device to deliver at leastType: GrantFiled: February 16, 2005Date of Patent: November 3, 2009Assignee: Lafarge Canada Inc.Inventors: Brian O'Hearn, Nils Steward
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Patent number: 6835244Abstract: A synthetic slag is produced by melting the mineral content of an organic carbon-containing mineral, for example, oil shale or tar sands, with a source of lime such as cement kiln dust. The organic carbon, especially hydrocarbon, content of the mineral is oxidized by oxygen gas, which typically is derived from air or an air/oxygen combination, in an exothermic reaction and the heat generated provides the thermal energy for the reaction between the mineral content and the source of lime. In this way the gaseous products will typically comprise nitrogen, unreacted oxygen, water vapor and carbon dioxide, and heat energy can be readily recovered from the hot off gas products evolving during the combustion reaction. The synthetic slag may be pelletized and employed as lightweight mineral aggregate or milled, or atomized and then milled, to cement fineness to provide slag cement.Type: GrantFiled: August 26, 2002Date of Patent: December 28, 2004Assignee: Lafarge Canada Inc.Inventors: David Bridson Oates, John Graham Whellock, Philip Souza Zacarias
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Patent number: 6783585Abstract: Concrete's durability to freeze-thaw cycles is dependent on its level of air entrainment, the appropriate level of which is achieved with the aid of surface active or air entraining agents. These agents promote the fragmentation of large air voids into smaller ones and stabilize air voids in the concrete. The carbon matter found in fly ash when used as a pozzolanic component of concrete, adsorbs the air entraining agents, reduces the air voids and concrete's ability to withstand many freeze-thaw cycles. This invention teaches a process for a partial removal of the carbon from the coal ash, used in concrete, through a partial combustion of only a fine carbon fraction of the carbon residue of the coal ash responsible for adsorbing the air entraining agents, in a reactor with a controlled ignition system. The process of the invention thus limits the adsorption of the air entraining agents and improves the freeze-thaw properties of the concrete produced.Type: GrantFiled: October 15, 2002Date of Patent: August 31, 2004Assignee: Lafarge Canada Inc.Inventors: Philip Souza Zacarias, David Bridson Oates
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Patent number: 6764544Abstract: A method of cement clinker manufacture comprises feeding a clinker feed material containing a source of calcium carbonate into a feed end of a cement kiln, the feed material is heat processed in the kiln to produce cement clinker with emission of carbon dioxide from thermal decomposition of said source of calcium carbonate and discharge of the carbon dioxide from the kiln, and cement clinker is discharged from a discharge end of the kiln; a coal ash derived from burning pulverized lignite or sub-bituminous coal is included in the feed material fed into the feed end to replace a portion of the source of calcium carbonate, and provides a source of calcium as well as other components notably silicon and aluminum, in the formation of the cement clinker, with a lowering of the emission of carbon dioxide in the kiln, per unit weight of cement clinker produced.Type: GrantFiled: December 23, 2002Date of Patent: July 20, 2004Assignee: Lafarge Canada Inc.Inventors: David Bridson Oates, Alan Van Sloten
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Patent number: 6755905Abstract: A synthetic slag is produced by a high temperature combustion reaction between coal ash having a high carbon content, and a source of lime such as cement kiln dust. The carbon content of the coal ash is oxidized by oxygen gas, which typically is derived from air or an air/oxygen combination in an exothermic reaction and the heat generated is exploited in the melting process. In this way the gaseous products will typically comprise nitrogen, unreacted oxygen and carbon dioxide, and heat energy can be readily recovered from the hot off gas products evolving during the combustion reaction. The synthetic slag may be pelletized and employed as lightweight mineral aggregate or milled to cement fineness to provide slag cement.Type: GrantFiled: February 15, 2002Date of Patent: June 29, 2004Assignee: Lafarge Canada Inc.Inventors: David Bridson Oates, John Graham Whellock, Philip Souza Zacarias
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Patent number: 6402833Abstract: A binder for mine tailings and aggregate used as a backfill for an underground void comprises ferrous slag, and cement kiln dust, optionally with lime kiln dust; the binder displays strength characteristics better than or comparable to those achieved with conventional binders based on Portland cement and slag.Type: GrantFiled: July 13, 2000Date of Patent: June 11, 2002Assignee: Lafarge Canada Inc.Inventors: Brian O'Hearn, Terrance Ronald Walton
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Patent number: 6391105Abstract: The yield of cement clinker recovered from a kiln assembly is enhanced by feeding a particulate material comprising silica and an oxide of at least one of calcium and aluminum, for example, fly ash into contact with hot cement clinker; the fly ash melts to a partially fused material which chemically reacts with the hot clinker to produce a pyroprocessed cement clinker of crystalline hydraulic silicates; the extruder is added to the hot cement clinker downstream of the formation of the cement clinker, and suitably is added to the hot cement clinker at the upstream end of the cooler of the kiln assembly, or within the kiln, downstream of the burning zone, and more especially in the initial cooling zone at the discharge end of the kiln.Type: GrantFiled: February 16, 2001Date of Patent: May 21, 2002Assignee: Lafarge Canada Inc.Inventors: David Bridson Oates, Kevin Moire Cail, Paul Honore Lehoux, Robert Kim Ungar, Donald Stephen Hopkins, James Edward Cross, Michael Ritch
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Patent number: 5976243Abstract: Undried blast furnace slag, for example, granulated blast furnace slag having a water content of 3 to 20, generally 5 to 15%, by weight, is introduced to hot clinker in a cooler downstream of a cement kiln; the water is volatilized or evaporated in the cooler to provide a cement clinker having an effective content of dried blast furnace slag free of water; this permits use of blast furnace slag in a blended cement without the need for separate special steps for drying the slag.Type: GrantFiled: September 24, 1998Date of Patent: November 2, 1999Assignee: Lafarge Canada Inc.Inventors: David Bridson Oates, Alan Melvin Van Sloten, Kevin Moire Cail
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Patent number: 5944861Abstract: Metallurgical slag is expanded to produce a lightweight solid by forming a stream of molten liquid slag of controlled rate of flow and mixing the stream of slag with a controlled quantity of water and flowing the interacting mixture of slag and water into a receptacle. The interaction between slag and water is allowed to proceed for a predetermined period of time to form an expanded solid without the addition of any additional cooling water which would otherwise quench the material and vitrify it. In the receptacle, a vaned rotor operates to segment the interacting mixture of slag and water and project the segmented mixture through the air for collection into a heap.Type: GrantFiled: December 19, 1997Date of Patent: August 31, 1999Assignee: Lafarge Canada Inc.Inventors: Peter A. MacKenzie, David T. Horvat
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Patent number: 5928420Abstract: A combination of a class C fly ash having a high analytical content of CaO, and a silica fume, with a hydraulic cement, such as Portland cement, produces concrete with alkali-silica reactive aggregate having acceptable low expansion such as by ASTM C 1260; and also produces sulphate resistance with mineral aggregates generally.Type: GrantFiled: September 24, 1998Date of Patent: July 27, 1999Assignee: Lafarge Canada, Inc.Inventors: David Bridson Oates, Michael David Arthur Thomas, Philip de Sousa Zacarias, Donald Stephen Hopkins, Kevin Moire Cail
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Patent number: 5849075Abstract: Ground bottom ash, a waste material derived from combustion of coal, which presents a disposal problem, replaces part of the cement in a cementitious material useful in concretes and mortars and provides compressive strengths in concretes comparable with or better than corresponding cements in which there is no replacement of cement by ground bottom ash and cements containing fly ash.Type: GrantFiled: January 30, 1997Date of Patent: December 15, 1998Assignee: Lafarge Canada Inc.Inventors: Donald Stephen Hopkins, David Bridson Oates
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Patent number: 5837052Abstract: Contaminated coal ash, for example flyash contaminated with carbon is introduced to hot clinker in a cooler downstream of a cement kiln; the carbon is combusted in the cooler to provide a cement clinker having an effective content of flyash free of carbon; this permits use of flyash contaminated with carbon without the need for separate special steps for carbon removal; volatile contaminants or contaminants having a volatile component, for example adsorbed ammonia are similarly removed in the cooler by volatilization.Type: GrantFiled: April 10, 1997Date of Patent: November 17, 1998Assignee: Lafarge Canada Inc.Inventors: David Bridson Oates, Horace Hershel Compton, Syed Suhail Akhtar