WO2001062458A1 - Procede de preparation de melanges de ciment - Google Patents

Procede de preparation de melanges de ciment Download PDF

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Publication number
WO2001062458A1
WO2001062458A1 PCT/IB2001/000225 IB0100225W WO0162458A1 WO 2001062458 A1 WO2001062458 A1 WO 2001062458A1 IB 0100225 W IB0100225 W IB 0100225W WO 0162458 A1 WO0162458 A1 WO 0162458A1
Authority
WO
WIPO (PCT)
Prior art keywords
cement
mixes
mix
water
wet
Prior art date
Application number
PCT/IB2001/000225
Other languages
English (en)
Inventor
Alessandro Quadrio Curzio
Original Assignee
Alessandro Quadrio Curzio
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 Alessandro Quadrio Curzio filed Critical Alessandro Quadrio Curzio
Priority to AU32172/01A priority Critical patent/AU3217201A/en
Publication of WO2001062458A1 publication Critical patent/WO2001062458A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/003—Methods for mixing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/48—Clinker treatment
    • C04B7/52—Grinding ; After-treatment of ground cement

Definitions

  • the process according to the present invention concerns the wet dressing of cement mixes, comprising solid components and water, for immediate use - directly on the yard or close to the dressing site - in the production of plain concrete and other articles using cement as a binder, such as concrete mixes of various types, and different kinds of articles as, for example, asbestos cement articles and grouting mixes for injections of consolidation and/or impermeabilization.
  • cement is a hydraulic binder which, mixed with water, gives rise to products having a mechanical resistance and chemical stability, even if kept under water
  • the most important hydraulic binder is Portland cement, which consists of a mixture of clinker and hydrate calcium sulphate (or, more rarely, natural anhydrite) , the clinker being in turn the baking product, at about 1 300-1 500 °C, of a mixture of limestone, clay, sand, purple ore, and so on. It is also known that clinker, once it has been cooled and mixed with modest percentages of bihydrated gypsum - and eventually with pozzuolana or slag, in the production of pozzuolana or slag cement - is dry-milled into ball mills, consisting of horizontal rotating cylinders containing steel balls or rods which bump into one another squashing and grinding the material.
  • milling is an essential step as it has an important effect on the surface area of the product, which in turn determines the hardening speed and the final strength- in fact, the finer the cement the more accentuated are these properties.
  • the milling costs get higher the finer the cement one tries to obtain.
  • cement has always been dry-milled - at least on an industrial scale - the product obtained being meant, ever since the start, to be prepared on the production site so as to be stored and/or conveyed in a dry state, into sacks and/or loose, in tankers and in siios.
  • cement has always been used at a great distance, in space and time, from the production sites, since the opportunities of an immediate use thereof as soon as prepared, to produce concrete or other mixes, were rare and anyhow not taken into consideration.
  • the invention also concerns a process for the production of concrete and concrete mixes, which consists in preparing a cement mix with the wet-milling process described heretofore and in subsequently mixing said mix with the suitable inert aggregates, such as sand and gravel.
  • the wet-milling process according to the present invention besides being suited to produce concrete mixes for ordinary use, is also particularly suited to prepare both mixes used as a starting material for the production of articles using cement as a binder, for example asbestos cement articles, and grouting mixes for injections of consolidation and/or impermeabilization
  • the milling determines an increase of the viscosity of said mix (the viscosity being higher the finer the product obtained), which should actually keep within a range such as to ensure a good mixing of the product.
  • the mix should be used for the production of concrete, and that the water/cement ratio should be higher than desired - due, for example, to the humidity of the aggregates - it is evidently possible, with a slight addition of dry cement, to reestablish the desired ratio
  • a high concentration of the mix allows to obtain the best milling results by operating with microball mills.
  • the mix - prepared, as seen, in the turbodissolver - is introduced into a microball mill, to carry out a proper wet- milling thereof possibly after having added thereto a fluidizer or a superfluidizer and/or a retarder and/or chemical agents for hydration control, according to the operating requirements and to the type of cement mix one wishes to obtain. It is normally preferable - but not strictly necessary - to carry out said addition in water, before adding the cement, on preparing the mix.
  • the mix obtained from the microball mill, with the wet-milling process according to the invention is ready to be immediately used for the production of concrete and concrete mixes, possibly after having added thereto pozzuolana or other components for special cements (which could even have been wet-milled separately)
  • the mix according to the invention must be combined within a short period of time - which, however, need not be so strictly short as to prevent reasonable waiting times on the building yard, or short transports close to the production site - with the suitable inert aggregates
  • the cement mixes, the different kinds of articles and the mixes for injections thus obtained are of excellent quality, as if one had started from fine or microfine cement, but their costs are much lower thanks to the easiness of the wet-miiling process and to its reduced costs Moreover, the wet-milling can determine an even considerable temperature increase of the mix, with advantageous effects - for example - in the production of concretes in cold climates.
  • the mixes were pumped, by means of a suitable pump, into a microball mill, and they were milled for a few minutes. Some samples were then taken of the outcoming product, the fineness of which depended on the speed of its passage through the mill Two granulomet ⁇ c tests were carried out on the mixes before the milling, and four were carried out after the milling.
  • D90, D50 and D 10 are the lower micron values, for which 90% , 50% and 10% of the particles are dimensionally evidenced.
  • the specific surface value expressed in the Table should be considered as a term of comparison, but with no absolute value, in that it forms a datum which has been mathematically reckoned on the basis of the granulometric data, and not physically reckoned, as done with the specific equipment.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

On décrit un procédé de préparation de mélanges de ciment destinés à une utilisation immédiate pour produire des mélanges de béton ou d'autres matières ou qui sont destinés à être utilisés en tant que mélanges de coulis pour des injections, ce procédé consistant à broyer par voie humide avec de l'eau les constituants solides desdits mélanges, le rapport entre l'eau et les constituants solides variant entre 0,2 et 0,8 et se situant de préférence dans la plage comprise entre 0,28 et 0,60. Cette invention concerne également la production de mélanges de béton ou d'autres matières et de mélanges de coulis pour injections dans les travaux de consolidation et/ou d'imperméabilisation des sols, et plus particulièrement du béton produit à partir desdits mélanges.
PCT/IB2001/000225 2000-02-24 2001-02-20 Procede de preparation de melanges de ciment WO2001062458A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32172/01A AU3217201A (en) 2000-02-24 2001-02-20 Process to prepare cement mixes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000MI000334A IT1317851B1 (it) 2000-02-24 2000-02-24 Procedimento di preparazione di miscele cementizie.
ITMI2000A000334 2000-02-24

Publications (1)

Publication Number Publication Date
WO2001062458A1 true WO2001062458A1 (fr) 2001-08-30

Family

ID=11444157

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/000225 WO2001062458A1 (fr) 2000-02-24 2001-02-20 Procede de preparation de melanges de ciment

Country Status (3)

Country Link
AU (1) AU3217201A (fr)
IT (1) IT1317851B1 (fr)
WO (1) WO2001062458A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004058662A1 (fr) * 2002-12-24 2004-07-15 Tsinghua University Mortier a deux composants, procede correspondant, et application de ce mortier
WO2005019129A2 (fr) * 2003-07-23 2005-03-03 Gebr. Pfeiffer Ag Procede et dispositif de fabrication de ciment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB494856A (en) * 1936-07-30 1938-11-02 Harry Ridley Improved sprayable cement mortar
GB986620A (en) * 1960-07-26 1965-03-17 Takabayashi Toshiaki Improvement in production method for cement mortar or concrete
US3429726A (en) * 1962-10-14 1969-02-25 Toshiaki Takabayashi Method of producing cement mortar or concrete
DE2506992A1 (de) * 1975-02-19 1976-08-26 Weinen Geb Emrich Gertrud Seewasserfester betom
WO1990014322A1 (fr) * 1989-05-22 1990-11-29 Ing. Giovanni Rodio & C. Impresa Costruzioni Speciali S.P.A Procede et installation de production de melanges de ciment pour injection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB494856A (en) * 1936-07-30 1938-11-02 Harry Ridley Improved sprayable cement mortar
GB986620A (en) * 1960-07-26 1965-03-17 Takabayashi Toshiaki Improvement in production method for cement mortar or concrete
US3429726A (en) * 1962-10-14 1969-02-25 Toshiaki Takabayashi Method of producing cement mortar or concrete
DE2506992A1 (de) * 1975-02-19 1976-08-26 Weinen Geb Emrich Gertrud Seewasserfester betom
WO1990014322A1 (fr) * 1989-05-22 1990-11-29 Ing. Giovanni Rodio & C. Impresa Costruzioni Speciali S.P.A Procede et installation de production de melanges de ciment pour injection

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004058662A1 (fr) * 2002-12-24 2004-07-15 Tsinghua University Mortier a deux composants, procede correspondant, et application de ce mortier
US7708825B2 (en) 2002-12-24 2010-05-04 Tsinghua University Sialite binary wet cement, its production method and usage method
WO2005019129A2 (fr) * 2003-07-23 2005-03-03 Gebr. Pfeiffer Ag Procede et dispositif de fabrication de ciment
WO2005019129A3 (fr) * 2003-07-23 2005-04-28 Pfeiffer Ag Geb Procede et dispositif de fabrication de ciment
EA007418B1 (ru) * 2003-07-23 2006-10-27 Гебр. Пфайффер Аг Способ и устройство для получения цемента

Also Published As

Publication number Publication date
IT1317851B1 (it) 2003-07-15
ITMI20000334A0 (it) 2000-02-24
AU3217201A (en) 2001-09-03
ITMI20000334A1 (it) 2001-08-24

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