EP0051498B1 - Procédé pour la préparation de produits à base de liants hydrauliques - Google Patents

Procédé pour la préparation de produits à base de liants hydrauliques Download PDF

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Publication number
EP0051498B1
EP0051498B1 EP81305249A EP81305249A EP0051498B1 EP 0051498 B1 EP0051498 B1 EP 0051498B1 EP 81305249 A EP81305249 A EP 81305249A EP 81305249 A EP81305249 A EP 81305249A EP 0051498 B1 EP0051498 B1 EP 0051498B1
Authority
EP
European Patent Office
Prior art keywords
film
water
films
binder
weight
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.)
Expired
Application number
EP81305249A
Other languages
German (de)
English (en)
Other versions
EP0051498A2 (fr
EP0051498A3 (en
Inventor
Adriano Grondona
Andrea Vittone
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.)
Montedison SpA
Original Assignee
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 Montedison SpA filed Critical Montedison SpA
Publication of EP0051498A2 publication Critical patent/EP0051498A2/fr
Publication of EP0051498A3 publication Critical patent/EP0051498A3/en
Application granted granted Critical
Publication of EP0051498B1 publication Critical patent/EP0051498B1/fr
Expired 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
    • 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 relates to a process for the preparation of manufactured products based on hydraulic binders, provided with a reinforcement of a fibrilled synthetic polymeric material.
  • PCT Specification No. WO.80/ 01888 discloses a process of manufacturing construction products comprising the steps of feeding dry constituents including a liquid-setting powder and a reinforcement thereof into a moulding zone, compacting the constituents in such zone, exposing at least one upstanding surface of the compacted constituents and applying to that surface a predetermined quantity of setting liquid, being a quantity sufficient to wet all of the compacted constituents.
  • British Specification No. GB-A-2034627 discloses a process for producing reinforced articles made from a hydraulic material, e.g. cement, and a fibrillated film network, e.g. polypropylene, including the steps of placing a so-called mattress formed by a multiplicity of layers of fibrillated film in a mould, applying the hydraulic material to the mattress, de-watering the hydraulic material and removing the article from the mould.
  • a hydraulic material e.g. cement
  • a fibrillated film network e.g. polypropylene
  • the present invention provides a process for preparing a manufactured product based on a hydraulic binder and containing a reinforcement of synthetic polymeric material, the process comprising:
  • the assembly thus obtained by said operation (d) or by the combination of said operations (c) and (d) may be subjected to a treatment under vacuum for the removal of any excess water.
  • a series of said operations (a) to (d) may be repeated on the non-compressed product obtained from a preceding series of operations (a) to (d), until there is obtained a manufactured product, for example a plate, of the required thickness, the compression operation being subsequently applied to obtain the finished or end product.
  • the vacuum treatment may be carried out at the end of each series of operations (a) to (d), or before the final compression operation.
  • the fibrilled films usable in the present invention may be made of any orientable synthetic polymer, and are prepared by fissuring or splitting a mono-oriented film, for example by means of heated reliefs, points or blades, and by stretching the film thus obtained crosswise, thus conferring to it a netlike structure.
  • the film may also incorporate a suitable filler, such as a zirconium compound, a diatomite, or a cement mix, as described in Italian patent application Nos. 26463/79 and 26861/79.
  • a suitable filler such as a zirconium compound, a diatomite, or a cement mix, as described in Italian patent application Nos. 26463/79 and 26861/79.
  • All known hydraulic binders such as Portland cements, aluminous cements, hydraulic limes, and chalk, may be used in the process of the present invention.
  • One advantage of the process according to the present invention in comparison with the preparation from aqueous mixes of binders, is that of using only the quantity of water necessary for the development of the hydration of the binder, or a quantity only slightly greater, and consequently a considerable reduction in the installation costs and the energy consumption of the process may be achieved.
  • the number of superimposed fibrilled films, ' used in one distribution of the hydraulic binder according to operation (a), is preferably from 2 to 100.
  • the quantity by weight of fibrilled film utilized is preferably from 2% to 7.5% by weight of the weight of the hydraulic binder, considered in the dry state.
  • the quantity of the water added in the operation (c) is from 12% to 30% by weight based on the weight of the binder in the dry state.
  • This package was then placed into a suitable mold and strewn with Portland cement powder by means of a powder-dispenser which, according to known techniques, spread uniformly over the whole 50 x 50 cm plane a quantity of 650 g of cement, while simultaneously carrying out a slight vibratory motion to promote easy penetration by the cement powder into the package.
  • the net uniformly dispersed with the cement was sprinkled uniformly by means of a set of drizzling nozzles with 130 cc of water, corresponding to a water/cement ratio of 23%.
  • the water was additioned with a cement super- fluidizer (Melment 10 of SKW in a 20% concentration) in a ratio of 13 g per 130 cc of water.
  • a cement super- fluidizer Melment 10 of SKW in a 20% concentration
  • the assembly thus obtained was subjected to lateral vibrations by means of mechanical vibrators, andto a downward compacting action with a compacting blade connected to a vibrator, according to known techniques in the field of cement processing.
  • the assembly was subjected to a vacuum of 200 mmHg for about 1 minute, thereby extracting 200 cc of water; the impregnated plate formed was thereupon removed from the mold, compressed at a pressure of 45 kg/sq.cm and finally allowed to age and harden for 28 days.
  • the package was formed by a total of 40 nets, arranged in groups or batches of 10 nets with their main reticular axes, derived from the fibrillation, at 90° to each other, so as to impart to the cement plate to be prepared a mechanical iso- tropy.
  • the package was then dispersed uniformly with 1730 g of dry Portland cement powder as in the preceding example; the mold was then subjected to a slight vibration in order to facilitate penetration of the cement into the meshes of the nets.
  • the mold was then subjected to a vacuum of about 200 mmHg for about 1 minute, removing thereby about 100 cc of water and thus reducing the excess water contained in the net-cement mass to about 13% of the cement.
  • the plate was then compressed under a pressure of 45 kg/sq.cm and was then allowed at age and harden for 28 days.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • General Preparation And Processing Of Foods (AREA)

Claims (5)

1. Un procédé de préparation d'un produit manufacturé à base de liant hydralique et contenant un renforcement en matériau polymère synthétique, ce procédé consistant en:
- le mélange d'un liant hydraulique sous la forme d'une poudre sèche avec le renforcement,
- l'application d'un mouvement vibratoire aux constituants secs, et
- l'application de l'eau uniformément à la surface des constituants compactés,
caractérisé en ce que le liant hydraulique est distribué sur au moins un film réticulé ouvert obtenu par fissuration ou fendillement d'un film mono-orienté et extension de ce film en direction transversale, et de préférence une pluralité de ces films réticulés ouverts superposés, en ce que la quantité d'eau est comprise entre 12 et 30% en poids par rapport au poids du liant à l'état sec, et en ce que l'ensemble du ou des films, de l'eau et du liant est soumis à un mouvement vibratoire pour conduire à l'obtention d'un mélange homogène de l'eau et du liant à l'intérieur du réseau formé par le ou les films, puis soumis à une compression.
2. Un procédé selon la revendication 1, caractérisé en ce que la pluralité de ces films superposés comprend de 2 à 100 films.
3. Un procédé selon la revendication 1 ou 2, caractérisé en ce que ce ou ces films comprennent de 2 à 7,5% en poids de liant hydraulique à l'état sec.
4. Un procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'à la fin de l'opération de mise en vibration de l'ensemble du ou des films, de l'eau et du liant, on met en oeuvre un traitement sous vide pour l'élimination de toute eau en excès.
EP81305249A 1980-11-05 1981-11-04 Procédé pour la préparation de produits à base de liants hydrauliques Expired EP0051498B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT25768/80A IT1141089B (it) 1980-11-05 1980-11-05 Procedimento per preparare manufatti a base di leganti idraulici,rinforzati con film polimerici fibrillati
IT2576880 1980-11-05

Publications (3)

Publication Number Publication Date
EP0051498A2 EP0051498A2 (fr) 1982-05-12
EP0051498A3 EP0051498A3 (en) 1983-07-20
EP0051498B1 true EP0051498B1 (fr) 1987-09-16

Family

ID=11217671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305249A Expired EP0051498B1 (fr) 1980-11-05 1981-11-04 Procédé pour la préparation de produits à base de liants hydrauliques

Country Status (6)

Country Link
EP (1) EP0051498B1 (fr)
DE (1) DE3176447D1 (fr)
DK (1) DK488381A (fr)
ES (1) ES506825A0 (fr)
IT (1) IT1141089B (fr)
YU (1) YU262181A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK17592A (da) * 1992-02-13 1993-08-14 Inge Bodil Elmstroem Soerensen Gipsplade til lydabsorption samt fremgangsmaade til fremstilling af en saadan gipsplade
US5476617A (en) * 1993-02-19 1995-12-19 The Board Of Regents Of The University Of Wisconsin Rotational and vibrational process for molding cellulosic fibers

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1130612A (en) * 1966-08-15 1968-10-16 Shell Int Research The manufacture of a water-hardenable mass; the manufacture of articles therefrom; and the resulting articles and use thereof
DE2409231A1 (de) * 1974-02-27 1975-09-04 Heidelberg Portland Zement Verfahren zur herstellung von durch anorganische bindemittel verfestigten und durch mineralfasern verstaerkten raumformkoerpern
NO781562L (no) * 1977-05-05 1978-11-07 Eternit Fab Dansk As Fiberarmerte bygningsprodukter.
NL7714571A (nl) * 1977-12-30 1979-07-03 Stamicarbon Werkwijze voor het vervaardigen van voorwerpen uit met water hardend materiaal.
US4297414A (en) * 1978-07-07 1981-10-27 Mitsui Petrochemical Industries, Ltd. Reinforcing material for hydraulic substances and method for the production thereof
GB2034627A (en) * 1978-11-04 1980-06-11 Dow Mac Concrete Ltd Process for moulding reinforced articles from a hydraulic binder
WO1980001888A1 (fr) * 1979-03-05 1980-09-18 Bevan Ass C G Moulage de produit de construction

Also Published As

Publication number Publication date
EP0051498A2 (fr) 1982-05-12
IT8025768A0 (it) 1980-11-05
YU262181A (en) 1983-02-28
IT1141089B (it) 1986-10-01
DK488381A (da) 1982-05-06
EP0051498A3 (en) 1983-07-20
ES8302524A1 (es) 1983-02-01
ES506825A0 (es) 1983-02-01
DE3176447D1 (en) 1987-10-22

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