EP0021362A1 - Process and device for the manufacture of reinforced concrete slabs - Google Patents

Process and device for the manufacture of reinforced concrete slabs Download PDF

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Publication number
EP0021362A1
EP0021362A1 EP80103450A EP80103450A EP0021362A1 EP 0021362 A1 EP0021362 A1 EP 0021362A1 EP 80103450 A EP80103450 A EP 80103450A EP 80103450 A EP80103450 A EP 80103450A EP 0021362 A1 EP0021362 A1 EP 0021362A1
Authority
EP
European Patent Office
Prior art keywords
net
cement
layer
cement mix
slab
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.)
Withdrawn
Application number
EP80103450A
Other languages
German (de)
English (en)
French (fr)
Inventor
Andrea Vittone
Pierpaolo Camprincoli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moplefan SpA
Montedison SpA
Original Assignee
Moplefan SpA
Montedison SpA
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 Moplefan SpA, Montedison SpA filed Critical Moplefan SpA
Publication of EP0021362A1 publication Critical patent/EP0021362A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
    • B28B5/027—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of the indefinite length type, e.g. belts, and being continuously fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0006—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects the reinforcement consisting of aligned, non-metal reinforcing elements

Definitions

  • the present invention concerns a process and corresponding device for the continuous preparation of slabs, pa nels and the likes, based on hydraulic or water-settable binders, containing incorporated in them net-shaped structures as a reinforcement.
  • the process of this invention allows to carry put this preparation in a continuous way, at acceptable industrial production speeds, and without the above mentioned drawbacks, even when using reinforcing structures of a very high num ber of superimposed layers.
  • the process of this invention may consist of one sin gle series of operations from (a) to (f), or it maycompri se any wanted number of such operational series, in succession sion,one after the other, with the formation of slabs con taining any wanted number of net-like structures alternated to layers of cement mix.
  • cement mix one must intend a mixture entirely consisting or mainly consisting of one or more hydraulic or water-settable binders such as e.g.: cement, chalk, mortar and the likes, with water and, in particular the mixtures having a volumetric ratio water/binder comprised between 30-50/100.
  • hydraulic or water-settable binders such as e.g.: cement, chalk, mortar and the likes, with water and, in particular the mixtures having a volumetric ratio water/binder comprised between 30-50/100.
  • ad ditives for various purposes, such as for instance:
  • a characteristic of the process of this invention is that of allowing, by means of a differential do sing or metering of each layer, the differentiating of the type of'mix in the various layers, depending on the particular characteristics one wishes to impart to the slab, with a wide range of possibilities of variation and with the pos sibility to save in production costs.
  • inert fillers may be added only to the innermost layers of the laminate on correspondence with the neutral deformation axis, thereby achieving a saving on the cost of cement and of reinforcement.
  • the distribution of the flows relating to the deposi tion of the cement mix layers before and after the deposi tion of each net-like structure, is made so as to ensure both the complete covering up.of the net as well as a uni form presence of the nets in the cement of the intermediate layers.
  • the slab is prepared using nets of a small number of fibrilled films, which therefore are more easily penetrated by the cement, it is sufficient to have only one dosing or metering device for each net position, unless one desires to obtain slabs of alternate layers of net and cement, in which case at the beginning of the first and of the last series of operations from (a) to (f), there must always be a free metering device or doser forming the initial and the last superficial layers.
  • the net-like structures, used as reinforcement in the process of this invention may be of any kind of synthetic polymer capable of forming fibrillable films.
  • Said net-like structures may be obtained starting from synthetic polymer films, by using known fibrillating methods, capable of imparting to the film by a successive cross-wise spreading an open-mesh net-like structure.
  • a method suited for preparing such structures is de - scribed, for instance, in English Patent n°1.073.741.
  • the net-like structure used in the process of this invention may consist of either just one single fibrilled film or of a plu rality of superimposed fibrilled films, possibly welded together.
  • the compacting operation (e) is carried out by means of devices that transmit a vibratnon,in an at least vertical sense, to the cement mix and that preferably hit the nets bedded in the cement layers contemporaneously downwards and with a high frequency, without, however, creating points of stopping of the advancing net.
  • the vertical vibratory action may also be combined with horizontal vibrations imparted to the surface of the conveyor belt or porous surface.
  • the compacting operation causes the penetration of the pasty matrix into the net-like reinforcement, acting un der pressure against the porous surface, and at the same time bringing about an intimate and uniform contact between matrix and reinforcement, eliminating air bubbles and zones of non-impregnation.
  • the compacting in general causes a slight loss of water through the porous surface. This water may be allowed to flow freely downward or be gathered, for instance, by means of suction systems with a very slight depression.
  • the compacting may be carried out in combination with vibrating high-frequency movements, imparted to the conveyor belt itself, in the impregnation zones, by electrical or mechanical vibrators, according to known cement vibration techniques.
  • the compression operation (f) aims at regulating or ad justing the thickness of the slab, at compressing the cement and to eliminate the air as well as the water in excess with respect to the content, considered,necessary, of 25-35% by weight on the global weight of nets and cement, and moreover to smoothen its surface.
  • the slab Before this operation the slab may, however, be subjected to a preliminary dehydration operation by suction under vacuum of the water. Likewise after the compression operation (f), the slab may be subjected to an additional vacuum suction treatment, with the purpose of further redu cing the content in water down to the value necessary to confer to it a consistency sufficient for possible successive successive sive processing operations such as, for instance, lateral (side) trimming, cutting, undulation., etc., before the fi nal hardening sets in.
  • the device which forms the further object of this in vention, is characterized in that it comprises one or more operational units arranged in series, each of which consists:
  • the feeder (a') may be represented by a standard reel--unwinder, reels on which the net-like open-mesh structures are wound up, and works maintaining the tension of said struc ture low and constant.
  • the device (c'), acting as a guide for the net-like structure may consist of a system of either smooth or fly ted or grooved rollers, or it may consist of rotating, freewheeling or motor-driven bushes, and will serve to approach the net-like structure to the horizontal porous surface and/ /or to deposit it onto the layer of cement mix deposited on said horizontal porous surface.
  • the porous surface (b l ), acting as conveyor belt, may consist of a heavy fabric, of the type of paper-mill felts or for cement-asbestos mixes.
  • Such a surface may have either a levelled or profiled cross-section, with any profile it is wished to impart to the slab, and may moreover, be provided with reliefs, gas kets or side blades, in order to ensure the lateral contain ment of the cement mixes.
  • That surface moves in the same direction and sense of the net-like structure feeder.
  • the feeder-doser (d') must be such as to ensure cha racteristics of constancy and uniformity of flow of the cement mix on the porous surface and/or on the net-like structure
  • This device may consist of various devices of dif ferent types, such as for instance:
  • the metering device will have to allow the easy emptying and washing of the installation during the stops of the machine, while it will also have to avoid flow variations due to clogging or to crystalline deposits on the part of the cement.
  • Each dosing or metering system must be fed by a volumetric pump which shall allow to vary the flows from layer to layer, and more particularly the flow of the last layer which, if a good superficial finish of the slab and a sure covering of the net-like reinforcement are wi shed, must be dosed in quantities much greater than that of the other layers.
  • the compacting vibrator (e l ) may take various forms, one of which is represented by element (8) (vertically ac ting vibrator) illustrated in figure L, (A) and (B), consis ting of a rotating rollers supporting frame (15), the rol lers being driven positively and being provided withneliefs, for instance blades arranged radially to the rollers and having a peripheral speed equal to or slightly greater than the sliding speed of the net/cement assembly on band (7).
  • roller-carrying frame is connected elastically with a vibrator (16), for instance an electro-magnetical one, carried by an upper supporting frame.
  • the distance between the edges of the blades and the band ( 7 ) is adjustable so that the blades be in contact with or draw in the surface of the slab being formed, so as to be able to hit it and set it into vibration.
  • the slab under formation receives, thus, mechanical stresses of a high frequency by the revolving blades, with out however their causing any stoppage of the movement of the slab itself.
  • the compacting device may be achieved also with rigid vertical elements having at their ends sliding elements such as, for instance, idling rollers, spheres, small plates oriented in the sense of motion of the nets, etc.. Or it may be achieved by rows of rotating elements turning in the sense of the net-like structure, for instance wheels, and prompted by the vibrations, to hit ra pidly the surface of the nets and of the cement mix.
  • the vibratory motion which acts vertically may be obtained,according to known methods, by means of electro--mechanical or pneumatic apparatuses, while the frequency of the vibrations, depending on the speed of the motion of the nets, on the type of nets and on the matrix and the thicknessof the slab, may vary within a very wide range, that is, from just a few cycles/second to several hundred cycles/second.
  • Compressor (f) may consist of a pair of rollers of which, for instance, the lower one is driven by a motor, and between which it is possible to carry out a distance ad justment and to pass the composite slab onto the conveyor belt; or it may consist of a doctor blade system with a smoothenmng and thickness-regulating blade.
  • these latter may be covered or coated with anti-adhesive sunstances, for in stance silicon resins, and they may, moreover, be fitted with scraping blades or with nozzles for air jets, in order to favour the detachment (separation) of the slab.
  • compressor (f l ) Before and/or after compressor (f l ) there may be pre sent, in a succession, suction systems for the removal of the excess of water present in the slab.
  • figure I is represented in a side view (A) and in a plan view (B), an operational unit of the device of this invention, with the accessory elements suited for its wor king.
  • A side view
  • B plan view
  • an operational unit of the device of this invention with the accessory elements suited for its wor king.
  • FIG. I,(C) represents a doctor-blade compression system, with blade (21) for the scraping and regulation of the thickness of the cement slab.
  • a type of device ac three cording to this invention consisting of/operational units arranged in series, where, additionally, there are represented: the suction systems (14) placed under the vibrators (8); a further suction system (11); a conveyor belt (18) for gathering the final plate or slab; a washing device (12) for the porous carrying surface; rotating blades (19) for the trimming of the slab and the moving cutting lance (20) for the cutting of the slab into crop-ends.
  • (B) represents a schematical view of the production steps for a composite slab consisting of three nets (2) alternated with three layers of cement mixes (21).
  • the percentage of residual water in each layer and the state of compacteness be such as to allow the diffused fil tration of the successive overlying layers.
  • the pres- surees in the compressor (10) (and the possible suction in the suction systems (14)), will have gradually growing values, growing from the first to the last operational unit and will have to be adjusted (regulated) in such a way that the residual water in each intermediate layer be comprised, as a general indication, to be verified,for each type of plant and each cement/nets composition, within about 0.25 to 0.35 of the water/solids relationship.
  • the final composite slab after compacting of the last cement/net layer, is prefera bly subjected to a vacuum phase with the purpose of removing the water in excess with respect to the final level of water/solid relationship of about 0.20-0.25, wherein the slab displays sufficient consistency for the successive processing stages.
  • the removal of the excess of water may also be obtai ned in the course of the last compression or lamination phase in the last operational unit which, having to bring the slab to the finally desided thickness, necessarily cre ates a considerable superficial pressure and increases the contact between the reinforcement and the matrix, eliminating the water in excess or possible air bubbles.
  • the process according to this invention permits also to produce slabs with different profiles, undualted etc., either by the known undulation or profiling systems on the trimmed and cut slabs, both by the use of a porous surface already having the desired profile, for instance an undula ted profile, and of all the organs of the machine and in particular the net-guides, the compactors, the vacuum boxes, the compre ssion or pressure rollers, as well as all the motion, transmission and belt-cleaning rollers having the same profile of the belt itself, so as to maintain the ne vessary adherence.
  • the slabs showed a finished size after trimming, of: 100 x 200 cm and 7 mm thickness.
  • the net of polypropylene showed a weight of 1 0 7 g/cc, had open meshes and was 106 cm wide, being formed of 12 layers of polypropylene films each 75 micron thick, fibrilled by longitudinal slitting and subsequently spread open transversally with a 9-fold expansion of its original width, wherefore it suffered a longitudinal shrinkage or contraction of 0.85.
  • the layers in the net showed the unfibrilled slanting bands arranged approximately at ⁇ 12° and ⁇ 25° with respect to the direction or sense of the slitting or fibrillation.
  • the preparation of the slabs was carried out by suces- sively impregnating with a cement mix 5 nets whose total weight amounted to 535 g/linear meter.
  • the cement mix was of the following composition:
  • the density of the mix was equal to 1.90 g/cu.cm
  • the peripheric (peripheral) speed of the rollers forming the compressor (10), is greater by about 2% than the speed of the porous surface, so as to maintain the slab always in traction (tension).
  • the porous surface (or conveyor belt) consisted of a felt of polypropylene fibres, needle-point treated, with a specific weight of 1500 g/sq.mt.
  • the compression rollers were regulated as follows:
  • the compacting system consisted of a frame carrying 4 (four) rollers, each carrying 32 blades, and having a diameter of 120 mm, said compacting system being operated by an elec tromagnetic vibrator producing vertically directed vibration, at a frequency of 3000 cycles/minute.
  • the slab at the outlet of the last compression position showed a content in water, measured by drying in an oven at 105° ⁇ 110°C, of 22.7% on the total weight of solids.
  • the slabs were trimmed at the edges to 100 cm width and then cut to a length of 200 cm.
  • the dosing or metering device n°1 and n°10 which give place to the formation of the two outside (external) layers of the finished slab, were fed with the above indicated mix additioned with 3.5% b.w. of red iron oxide, while the inter mediate metering devices were fed with the general mix.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP80103450A 1979-06-21 1980-06-20 Process and device for the manufacture of reinforced concrete slabs Withdrawn EP0021362A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23761/79A IT1121592B (it) 1979-06-21 1979-06-21 Procedimento e dispositivo per la fabbricazione di lastre di cemento rinforzante
IT2376179 1979-06-21

Publications (1)

Publication Number Publication Date
EP0021362A1 true EP0021362A1 (en) 1981-01-07

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ID=11209753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103450A Withdrawn EP0021362A1 (en) 1979-06-21 1980-06-20 Process and device for the manufacture of reinforced concrete slabs

Country Status (11)

Country Link
EP (1) EP0021362A1 (es)
JP (1) JPS5619710A (es)
AU (1) AU5944780A (es)
DK (1) DK259980A (es)
ES (1) ES492617A0 (es)
FI (1) FI801962A (es)
IT (1) IT1121592B (es)
NO (1) NO801811L (es)
PT (1) PT71428B (es)
YU (1) YU162080A (es)
ZA (1) ZA803684B (es)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116858A2 (en) * 1983-01-18 1984-08-29 Moplefan S.p.A. Process for manufacturing cement plates reinforced with fibrillated polymeric films
EP0128704A1 (en) * 1983-06-03 1984-12-19 Frank Brian Mercer Strengthening a matrix
EP0192208A2 (en) * 1985-02-15 1986-08-27 RETIFLEX S.p.A. Device for the continuous production of manufactured articles reinforced with hydraulic binders mixes and the corresponding process
EP0351730A1 (en) * 1988-07-18 1990-01-24 FIBRONIT S.r.l. Method for producing building sheets containing cement, inert materials and additives, and reinforced with plastics mesh
DE3840377A1 (de) * 1988-11-30 1990-05-31 Baehre & Greten Verfahren und vorrichtung zum herstellen von bauplatten
EP0382181A2 (en) * 1989-02-08 1990-08-16 FIBRONIT S.r.l. Concrete tubing reinforced with glass fibres and plastic material nets
EP0462937A1 (en) * 1990-06-20 1991-12-27 SOCIETA' ITALIANA LASTRE S.p.A. Equipment for making reinforced concrete slabs
WO2002070218A1 (en) * 2001-03-02 2002-09-12 James Hardie Research Pty Limited A method and apparatus for forming a laminated sheet material by spattering
EP1266734A2 (en) * 2001-06-11 2002-12-18 Venix S.r.l. Method and apparatus for the making of tiles, in particular for venetian floor tiles and the like
US7658794B2 (en) 2000-03-14 2010-02-09 James Hardie Technology Limited Fiber cement building materials with low density additives
US7708826B2 (en) 2001-03-02 2010-05-04 James Hardie Technology Limited Additive for dewaterable slurry and slurry incorporating same
US7993570B2 (en) 2002-10-07 2011-08-09 James Hardie Technology Limited Durable medium-density fibre cement composite
US7998571B2 (en) 2004-07-09 2011-08-16 James Hardie Technology Limited Composite cement article incorporating a powder coating and methods of making same
US8209927B2 (en) 2007-12-20 2012-07-03 James Hardie Technology Limited Structural fiber cement building materials
US8993462B2 (en) 2006-04-12 2015-03-31 James Hardie Technology Limited Surface sealed reinforced building element
WO2019014713A1 (en) * 2017-07-17 2019-01-24 The University Of Newcastle VIBRATION UNIT ASSEMBLY FOR A BELT CARRIER
CN110757612A (zh) * 2019-09-27 2020-02-07 中交二航局第四工程有限公司安徽混凝土装配化构件分公司 一种混凝土桥面板预制板生产线控制系统及控制方法
CN111250305A (zh) * 2020-03-20 2020-06-09 佛山市顺德区鹏麒机械科技有限公司 自动喷料机

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LU85515A1 (fr) * 1984-08-28 1986-03-11 Belge Etat Catalyseurs pour la transformation d'ethanol en ethylene et leur utilisation
AU652176B2 (en) * 1991-09-06 1994-08-18 Lin, Pao-Sou Improved precast concrete slab and method of making same

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FR905006A (fr) * 1944-06-06 1945-11-22 élément de construction et procédé de fabrication
FR923935A (fr) * 1946-03-18 1947-07-22 Matériau de construction ou de revêtement et son mode de fabrication
FR2356610A1 (fr) * 1976-07-01 1978-01-27 Univ Surrey Perfectionnements a la fabrication d'objets constitues par un element de renforcement et par une masse a durcissement dans l'eau
EP0003245A1 (en) * 1977-12-30 1979-08-08 Stamicarbon B.V. Process for the manufacture of articles of water-hardening material
BE880149A (nl) * 1978-11-21 1980-05-20 Stamicarbon Werkwijze en inrichting voor het vervaardigen van vezelversterkte hydraulisch gebonden
NL7908211A (nl) * 1978-11-21 1980-05-23 Stamicarbon Werkwijze en inrichting voor het vervaardigen van vezelversterkte hydraulisch gebonden voorwerpen.
GB2034627A (en) * 1978-11-04 1980-06-11 Dow Mac Concrete Ltd Process for moulding reinforced articles from a hydraulic binder

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JPS50157411A (es) * 1974-06-12 1975-12-19
JPS5349011A (en) * 1976-10-15 1978-05-04 Toyo Boseki Process for production of fibreereinforced cementitious board
JPS53109523A (en) * 1977-03-05 1978-09-25 Okura Industrial Co Ltd Continuous manufacturing apparatus for lighttweight gypsum fiber plate

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Publication number Priority date Publication date Assignee Title
FR905006A (fr) * 1944-06-06 1945-11-22 élément de construction et procédé de fabrication
FR923935A (fr) * 1946-03-18 1947-07-22 Matériau de construction ou de revêtement et son mode de fabrication
FR2356610A1 (fr) * 1976-07-01 1978-01-27 Univ Surrey Perfectionnements a la fabrication d'objets constitues par un element de renforcement et par une masse a durcissement dans l'eau
EP0003245A1 (en) * 1977-12-30 1979-08-08 Stamicarbon B.V. Process for the manufacture of articles of water-hardening material
GB2034627A (en) * 1978-11-04 1980-06-11 Dow Mac Concrete Ltd Process for moulding reinforced articles from a hydraulic binder
BE880149A (nl) * 1978-11-21 1980-05-20 Stamicarbon Werkwijze en inrichting voor het vervaardigen van vezelversterkte hydraulisch gebonden
NL7908211A (nl) * 1978-11-21 1980-05-23 Stamicarbon Werkwijze en inrichting voor het vervaardigen van vezelversterkte hydraulisch gebonden voorwerpen.
DE2946225A1 (de) * 1978-11-21 1980-05-29 Stamicarbon Verfahren und vorrichtung zur herstellung von faserverstaerkten, hydraulisch gebundenen formkoerpern
FR2442115A1 (fr) * 1978-11-21 1980-06-20 Stamicarbon Procede et dispositif pour la fabrication d'objets hydrauliques lies et renforces de fibres
GB2038701A (en) * 1978-11-21 1980-07-30 Stamicarbon Laminating layers of water-hardenable binder and fibres

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0116858A2 (en) * 1983-01-18 1984-08-29 Moplefan S.p.A. Process for manufacturing cement plates reinforced with fibrillated polymeric films
EP0116858A3 (en) * 1983-01-18 1985-12-04 Moplefan S.p.A. Process for manufacturing cement plates reinforced with fibrillated polymeric films
US4594210A (en) * 1983-01-18 1986-06-10 Moplefan S.P.A. Process for manufacturing cement plates reinforced with fibrillated polymeric films
EP0128704A1 (en) * 1983-06-03 1984-12-19 Frank Brian Mercer Strengthening a matrix
EP0192208A2 (en) * 1985-02-15 1986-08-27 RETIFLEX S.p.A. Device for the continuous production of manufactured articles reinforced with hydraulic binders mixes and the corresponding process
EP0192208A3 (en) * 1985-02-15 1988-12-14 Moplefan S.P.A. Device for the continuous production of manufactured articles reinforced with hydraulic binders mixes and the corresponding process
EP0351730A1 (en) * 1988-07-18 1990-01-24 FIBRONIT S.r.l. Method for producing building sheets containing cement, inert materials and additives, and reinforced with plastics mesh
US5030287A (en) * 1988-07-18 1991-07-09 Fibronit S.R.L. Cement mix and method for producing reinforced building sheets from a cement mix
DE3840377A1 (de) * 1988-11-30 1990-05-31 Baehre & Greten Verfahren und vorrichtung zum herstellen von bauplatten
EP0382181A2 (en) * 1989-02-08 1990-08-16 FIBRONIT S.r.l. Concrete tubing reinforced with glass fibres and plastic material nets
EP0382181A3 (en) * 1989-02-08 1991-11-06 FIBRONIT S.r.l. Concrete tubing reinforced with glass fibres and plastic material nets
EP0462937A1 (en) * 1990-06-20 1991-12-27 SOCIETA' ITALIANA LASTRE S.p.A. Equipment for making reinforced concrete slabs
US8182606B2 (en) 2000-03-14 2012-05-22 James Hardie Technology Limited Fiber cement building materials with low density additives
US7658794B2 (en) 2000-03-14 2010-02-09 James Hardie Technology Limited Fiber cement building materials with low density additives
US7727329B2 (en) 2000-03-14 2010-06-01 James Hardie Technology Limited Fiber cement building materials with low density additives
WO2002070218A1 (en) * 2001-03-02 2002-09-12 James Hardie Research Pty Limited A method and apparatus for forming a laminated sheet material by spattering
US7708826B2 (en) 2001-03-02 2010-05-04 James Hardie Technology Limited Additive for dewaterable slurry and slurry incorporating same
US7704316B2 (en) 2001-03-02 2010-04-27 James Hardie Technology Limited Coatings for building products and methods of making same
EP1266734A3 (en) * 2001-06-11 2003-11-12 Venix S.r.l. Method and apparatus for the making of tiles, in particular for venetian floor tiles and the like
EP1266734A2 (en) * 2001-06-11 2002-12-18 Venix S.r.l. Method and apparatus for the making of tiles, in particular for venetian floor tiles and the like
US7993570B2 (en) 2002-10-07 2011-08-09 James Hardie Technology Limited Durable medium-density fibre cement composite
US7998571B2 (en) 2004-07-09 2011-08-16 James Hardie Technology Limited Composite cement article incorporating a powder coating and methods of making same
US8993462B2 (en) 2006-04-12 2015-03-31 James Hardie Technology Limited Surface sealed reinforced building element
US8209927B2 (en) 2007-12-20 2012-07-03 James Hardie Technology Limited Structural fiber cement building materials
WO2019014713A1 (en) * 2017-07-17 2019-01-24 The University Of Newcastle VIBRATION UNIT ASSEMBLY FOR A BELT CARRIER
US11215397B2 (en) 2017-07-17 2022-01-04 The University Of Newcastle Vibration unit assembly for a belt conveyor
AU2018303840B2 (en) * 2017-07-17 2024-02-22 The University Of Newcastle Vibration unit assembly for a belt conveyor
CN110757612A (zh) * 2019-09-27 2020-02-07 中交二航局第四工程有限公司安徽混凝土装配化构件分公司 一种混凝土桥面板预制板生产线控制系统及控制方法
CN110757612B (zh) * 2019-09-27 2021-07-13 中交二航局第四工程有限公司 一种混凝土桥面板预制板生产线控制系统及控制方法
CN111250305A (zh) * 2020-03-20 2020-06-09 佛山市顺德区鹏麒机械科技有限公司 自动喷料机

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PT71428A (pt) 1980-07-01
IT7923761A0 (it) 1979-06-21
ES8104738A1 (es) 1981-05-16
YU162080A (en) 1983-10-31
ZA803684B (en) 1981-06-24
DK259980A (da) 1980-12-22
ES492617A0 (es) 1981-05-16
PT71428B (en) 1981-07-01
JPS5619710A (en) 1981-02-24
IT1121592B (it) 1986-04-02
NO801811L (no) 1980-12-22
AU5944780A (en) 1981-01-08
FI801962A (fi) 1980-12-22

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