EP0724941A1 - Verfahren zur Herstellung einer Betonplatte und Betonplatte hergestellt nach diesem Verfahren - Google Patents

Verfahren zur Herstellung einer Betonplatte und Betonplatte hergestellt nach diesem Verfahren Download PDF

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Publication number
EP0724941A1
EP0724941A1 EP96870009A EP96870009A EP0724941A1 EP 0724941 A1 EP0724941 A1 EP 0724941A1 EP 96870009 A EP96870009 A EP 96870009A EP 96870009 A EP96870009 A EP 96870009A EP 0724941 A1 EP0724941 A1 EP 0724941A1
Authority
EP
European Patent Office
Prior art keywords
natural stone
concrete
granules
milling cutter
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Withdrawn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
EP96870009A
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English (en)
French (fr)
Inventor
Ewald Houben
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.)
Marmorith Betonindustrie
Original Assignee
Marmorith Betonindustrie
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 Marmorith Betonindustrie filed Critical Marmorith Betonindustrie
Publication of EP0724941A1 publication Critical patent/EP0724941A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C5/00—Pavings made of prefabricated single units
    • E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/181—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools using cutters loosely mounted on a turning tool support

Definitions

  • the present invention relates to a process for manufacturing a concrete slab having a surface formed by granules of natural stone embedded in a matrix of cement stone, in which process concrete is prepared at least on the basis of said granules of natural stone and cement, this concrete being applied in a mould and enabled to harden in order to form a slab, and said surface of the hardened concrete slab being made rough.
  • the invention has now however as object to provide a process enabling to manufacture concrete slabs of natural stone with another type of look.
  • the process according to the invention is characterised in that said concrete is prepared on the basis of granules of a soft natural stone and said surface of the hardened slab being treated by means of a milling cutter so as to cleave grains of said natural stone present therein and to obtain a rough surface which is partially formed by the cleaved surfaces of the grains of natural stone.
  • a rough surface is thus obtained which is considerably formed by the natural cleaved surfaces from the grains of natural stone. This is achieved by the combination of the use of soft granules of natural stone and of a milling treatment for making rough the surface.
  • this natural stone has therefore in the process according to the invention a Mohs hardness of 2 to 5 and in particular a Mohs hardness of 2.5 to 4 and preferably of about 3.
  • said concrete is prepared on the basis of granules of natural stone having a granulometry between 0 and 6 mm.
  • said concrete is prepared on the basis of granules of natural stone having a sufficient quantity of fine fraction to form said cement stone.
  • the invention relates further also to a concrete slab manufactured by application of the process according to the invention and comprising a roughened surface formed by granules of natural stone embedded in a matrix of cement stone.
  • the granules of natural stone are formed by a soft natural stone and said surface is a rough milled surface with grains therein of said granules of natural stone which are cleaved as a result of the milling treatment.
  • firstly concrete 3 is prepared at least on the basis of the granules of natural stone and cement.
  • This concrete 3 is then applied in a mould and is hardened in order to form a slab.
  • a further layer of concrete 4 made of sand, cement and gravel is however mostly as usual applied in the mould.
  • This layer 4 has for example a thickness of 3 cm while the layer 3 with the granules of natural stone has for example a thickness of 1 to 2 cm.
  • the concrete layers 3 and 4 are, as known, vibrated at high frequency and pressed at for example 500 tons.
  • the surface 2 of the slab 1 is treated, after hardening, by means of a milling cutter, more specifically in such a manner that a number of grains from the natural stone present therein are cleaved and a rough surface is obtained being partially formed by the cleaved surfaces of the grains of natural stone.
  • a milling cutter By the selection given hereinafter of soft granules of natural stone and by using a milling cutter, natural cleaved surfaces are essentially obtained being practically not disturbed by the working of the milling cutter. In this way, a surface having a natural look is obtained wherein the cleaved surfaces of the grains of natural stone contribute to a special effect.
  • the remaining part of the surface is formed by the cement stone and the uncleaved grains of the granules of natural stone. Since these granules of natural stone are particularly obtained by grinding larger pieces of natural stone, the grains of these granules have already on their own cleaved surfaces. In order to obtain this effect, it is preferable to prepare the concrete 3 on the basis of granules of natural stone having a granulometry between 0 and 6 mm.
  • granules of a soft natural stone such as the known French natural stone or the Burgundian natural stone such as Comblanchien.
  • a soft natural stone such as the known French natural stone or the Burgundian natural stone such as Comblanchien.
  • other varieties of soft natural stone can be applied which deliver the desired rough structure with cleaved surfaces, when they are treated by means of a rotary milling cutter.
  • the Mohs hardness of the used granules of natural stone is efficiently between 2 and 5, in particular between 2.5 and 4 and is preferably about 3.
  • the granules of natural stone comprise preferably a sufficient quantity of fine fraction for forming a cement stone wherein the grains of natural stone are embedded. In this way, no sand or other fine granulated material must thus be used for preparing the concrete 3, so that a uniform colour can be given readily to the surface 2, which is already considerably formed by the cleaved surfaces of the granules of natural stone.
  • the concrete 3 is for example prepared from 450 kg white cement P50, 1600 kg Comblanchien ( 0 - 6 mm, hardness 2 to 3 Mohs), 3.7 l Superplasticizer and 250 litre water per m 3 .
  • a milling cutter 5 is used according to the invention, more particularly a rotary milling cutter.
  • FIG 2 a part of such a rotary milling cutter 5 is shown, more particularly the milling part itself.
  • This milling part has a number of shafts 6, for example six shafts, which are positioned at equal distance of a central geometric rotation axis 7.
  • the shafts 6 are for example fixed at the extremity to two circular discs 8.
  • These discs 8 are beard in the milling machine in a non illustrated manner and can be driven by means of a drive belt 9, for example by an electrical motor.
  • a number of milling cutter discs (“flails”) 10 are rotatably mounted on each of the shafts 6 in such a manner that the shafts 6 extend through the centre point of these milling cutter discs.
  • the milling cutter discs 10 are provided, at their periphery, with a number of protrusions 11, in particular five protrusions, by means of which the surface of the slab is milled.
  • These protrusions 11 are therefore provided, at their extremities, with a hard cutting element 12, for example from wolfram carbide.
  • circular rings 13 are for example applied therebetween.
  • additional circular discs 14 can be slid between the discs 8 over the shafts 6 in such a manner that the milling cutter discs 10 on the different shafts 6 are always in line and that therefore a certain groove structure is obtained in the surface 2 of the slab 1. Due to the special construction of the rotary milling cutter 5, this groove structure is not formed by fine ground grooves, but it pertains globally to the rough structure of the granules of natural stone of the surface 2.
  • a rotary milling cutter 5 as described hereinabove, of which the mutual distance between two neighbouring cutting elements 12 on the milling cutter discs 10 being practically equal to 1/3 to 1/5 of the distance between the shafts 6 and the geometric rotation axis 7.
  • the shafts 6 can further be positioned therefore in particular at 5 to 10 cm from the rotation axis 7 and more particularly at 7 to 8 cm from this rotation axis 7.
  • the milling cutter is preferably moved at a speed of about 1 m/min with respect to the slab.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
EP96870009A 1995-02-01 1996-02-01 Verfahren zur Herstellung einer Betonplatte und Betonplatte hergestellt nach diesem Verfahren Withdrawn EP0724941A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9500075 1995-02-01
BE9500075A BE1008731A5 (nl) 1995-02-01 1995-02-01 Werkwijze voor het vervaardigen van een betontegel en aldus vervaardigde tegel.

Publications (1)

Publication Number Publication Date
EP0724941A1 true EP0724941A1 (de) 1996-08-07

Family

ID=3888751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96870009A Withdrawn EP0724941A1 (de) 1995-02-01 1996-02-01 Verfahren zur Herstellung einer Betonplatte und Betonplatte hergestellt nach diesem Verfahren

Country Status (2)

Country Link
EP (1) EP0724941A1 (de)
BE (1) BE1008731A5 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0860549A3 (de) * 1997-02-24 1999-01-13 Marlux N.V. Bau-Materialien
WO1999041457A1 (en) * 1998-02-13 1999-08-19 Errut Products Limited Dual action cutting device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085865A (en) * 1980-10-20 1982-05-06 Quarries Ecc Ltd Concrete composition
EP0101062A1 (de) * 1982-08-11 1984-02-22 Alois Arnheiter Pflasterstein
DE3531772A1 (de) * 1985-09-06 1987-03-19 Basaltin Gmbh & Co Basaltbetonstein
DE8707034U1 (de) * 1987-05-15 1987-07-02 Basaltin GmbH & Co, 53545 Linz Granitbetonstein
DE3716344A1 (de) * 1987-05-15 1988-11-24 Basaltin Gmbh & Co Granitbetonstein
DE3927601A1 (de) * 1989-08-22 1991-03-14 Sf Vollverbundstein Verfahren und vorrichtung zur oberflaechengestaltung von steinprodukten, insbesondere von beton-pflastersteinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085865A (en) * 1980-10-20 1982-05-06 Quarries Ecc Ltd Concrete composition
EP0101062A1 (de) * 1982-08-11 1984-02-22 Alois Arnheiter Pflasterstein
DE3531772A1 (de) * 1985-09-06 1987-03-19 Basaltin Gmbh & Co Basaltbetonstein
DE8707034U1 (de) * 1987-05-15 1987-07-02 Basaltin GmbH & Co, 53545 Linz Granitbetonstein
DE3716344A1 (de) * 1987-05-15 1988-11-24 Basaltin Gmbh & Co Granitbetonstein
DE3927601A1 (de) * 1989-08-22 1991-03-14 Sf Vollverbundstein Verfahren und vorrichtung zur oberflaechengestaltung von steinprodukten, insbesondere von beton-pflastersteinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0860549A3 (de) * 1997-02-24 1999-01-13 Marlux N.V. Bau-Materialien
WO1999041457A1 (en) * 1998-02-13 1999-08-19 Errut Products Limited Dual action cutting device

Also Published As

Publication number Publication date
BE1008731A5 (nl) 1996-07-02

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