WO2002094427A1 - Method for the manufacture of aggregates and application of aggregates in a mortar or concrete - Google Patents

Method for the manufacture of aggregates and application of aggregates in a mortar or concrete Download PDF

Info

Publication number
WO2002094427A1
WO2002094427A1 PCT/NL2002/000324 NL0200324W WO02094427A1 WO 2002094427 A1 WO2002094427 A1 WO 2002094427A1 NL 0200324 W NL0200324 W NL 0200324W WO 02094427 A1 WO02094427 A1 WO 02094427A1
Authority
WO
WIPO (PCT)
Prior art keywords
aggregates
mortar
concrete
particles
green
Prior art date
Application number
PCT/NL2002/000324
Other languages
French (fr)
Inventor
Hendrikus Antonius Petrus Kouwenhoven
Original Assignee
Dsm N.V.
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 Dsm N.V. filed Critical Dsm N.V.
Publication of WO2002094427A1 publication Critical patent/WO2002094427A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic

Definitions

  • the invention relates to a method for making aggregates.
  • 'Aggregates' is the collective term for materials consisting of small particles. Aggregates are used for numerous purposes, for instance in the preparation of a mortar or a concrete.
  • a mortar is defined as a composition comprising a bonding agent, an aggregate and water.
  • 'concrete' within the scope of the present invention is understood a composition comprising a bonding agent, an aggregate, water and gravel.
  • 'Gravel' within the scope of the present application is defined as inorganic material which mainly consists of particles having a diameter of more than 4 mm. Mortar or concrete which has not yet cured is called 'green mortar' and 'green concrete', respectively.
  • the shape of the particles of which an aggregate consists has an effect on the properties of mortar, green mortar, concrete and green concrete, in particular on the processing characteristics of green mortar and green concrete.
  • the particles may vary in shape from round or virtually round to angular. Particles may have a multiplicity of sharp angles. Within the scope of the present application, particles having a shape mainly free of sharp angles are called 'round particles'. Particles having a shape with mainly sharp angles are called 'crushed particles'.
  • a greater proportion of round particles in an aggregate results in a less viscous green mortar or green concrete.
  • Obtaining a lower viscosity without changing the ultimate chemical composition of a mortar or concrete may offer a great advantage, for instance in the manufacture of mouldings in moulds with narrow or irregularly shaped sections.
  • round particles are advantageously used in mouldings in which high flowability is desired.
  • Crushed particles are preferably used in constructions in which low flowability is desired in order, for example, to reduce the pressure on tall shutterings.
  • the shape of particles is hardly used, if at all, to influence the processing characteristics of mortar or concrete.
  • aggregates which are used in the building construction industry are byproducts or waste products of processes. These waste products are of a continually varying composition and the chemical properties as well as the shape of the particles may vary.
  • a successful application of the principle that the particle shape can be used to influence the properties of mortar, green mortar, concrete or green mortar requires the availability of aggregates with particles of a controlled shape.
  • the invention provides a method for the manufacture of aggregates of a controlled particle shape by grinding of inorganic material.
  • round particles are obtained by grinding by means of a ball mill.
  • crushed particles are obtained by means of a (stud-type) crusher.
  • mills can be used to obtain fine particles, but the use of mills for the preparation of aggregates having a controlled particle shape is novel.
  • the method according to the invention enables aggregates of a controlled particle shape to be obtained.
  • the method according to the invention further offers the advantage that not only the granule shape, but also the chemical composition of the aggregate can be chosen. As is not the case with known aggregates, the desired combination of particle shape and chemical composition of the aggregate can now be obtained.
  • Another advantage offered by the method according to the invention is that the particle size distribution can also be chosen.
  • the particle size of the aggregates is not generally subject to limitations, a method is preferred whereby the particles on being crushed have a particle size smaller than 250 microns. More preferred is a method whereby the particles on being crushed have a particle size smaller than 120 or still more preferably smaller than 63 microns.
  • a mixture of aggregates according to the invention is therefore preferably added to concrete in the form of a granulate which disintegrates in an aqueous medium.
  • the granulate disintegrates in an aqueous medium merely by the effect of the mechanical forces which are always present when a mortar or concrete is being produced, so without any additional forces needing to be exerted on the granulate.
  • a method for the preparation of a granulate is described for instance in EP-A-0881942.
  • inorganic materials of which known aggregates consist can be used in the method according to the invention. However, it is also possible to use inorganic materials that hitherto have been unavailable as an aggregate. It is preferred for sand or limestone to be used as inorganic material.
  • the mortar, green mortar, concrete or green concrete can contain any known bonding agent. Preferably, cement is used as bonding agent.
  • the application of the concrete determines the required quantities of aggregate according to the invention, bonding agent and water in the mortar or concrete.
  • the invention also relates to the use of a grinding device for the manufacture of an aggregate of a controlled particle shape.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The invention relates to a method for the manufacture of aggregates of a controlled granule shape. The controlled granule shape is obtained by grinding inorganic material. The choice of the grinding device is determinative of the granule shape. The resulting aggregates can be used to influence the properties of a mortar, green mortar, concrete or green concrete. The use of aggregates with round particles results in a lower viscosity of a green mortar or green concrete. Obtaining a lower viscosity without changing the ultimate chemical composition of a mortar or concrete may offer a great advantage, for instance in the manufacture of mouldings in moulds with narrow or irregularly shaped sections.

Description

METHOD FOR THE MANUFACTURE OF AGGREGATES AND APPLICATION OF AGGREGATES IN A MORTAR OR CONCRETE
The invention relates to a method for making aggregates. 'Aggregates' is the collective term for materials consisting of small particles. Aggregates are used for numerous purposes, for instance in the preparation of a mortar or a concrete. Within the scope of the present application a mortar is defined as a composition comprising a bonding agent, an aggregate and water. By 'concrete' within the scope of the present invention is understood a composition comprising a bonding agent, an aggregate, water and gravel. 'Gravel' within the scope of the present application is defined as inorganic material which mainly consists of particles having a diameter of more than 4 mm. Mortar or concrete which has not yet cured is called 'green mortar' and 'green concrete', respectively.
It is known that the shape of the particles of which an aggregate consists has an effect on the properties of mortar, green mortar, concrete and green concrete, in particular on the processing characteristics of green mortar and green concrete. The particles may vary in shape from round or virtually round to angular. Particles may have a multiplicity of sharp angles. Within the scope of the present application, particles having a shape mainly free of sharp angles are called 'round particles'. Particles having a shape with mainly sharp angles are called 'crushed particles'.
A greater proportion of round particles in an aggregate results in a less viscous green mortar or green concrete. Obtaining a lower viscosity without changing the ultimate chemical composition of a mortar or concrete may offer a great advantage, for instance in the manufacture of mouldings in moulds with narrow or irregularly shaped sections. In general, round particles are advantageously used in mouldings in which high flowability is desired. Crushed particles, in contrast, are preferably used in constructions in which low flowability is desired in order, for example, to reduce the pressure on tall shutterings.
Yet the shape of particles is hardly used, if at all, to influence the processing characteristics of mortar or concrete. We have surprisingly found that the use of a given particle shape is seriously hampered by the availability of aggregates. In general, aggregates which are used in the building construction industry are byproducts or waste products of processes. These waste products are of a continually varying composition and the chemical properties as well as the shape of the particles may vary. A successful application of the principle that the particle shape can be used to influence the properties of mortar, green mortar, concrete or green mortar requires the availability of aggregates with particles of a controlled shape. The invention provides a method for the manufacture of aggregates of a controlled particle shape by grinding of inorganic material.
In the method according to the invention, round particles are obtained by grinding by means of a ball mill. In the method according to the invention, crushed particles are obtained by means of a (stud-type) crusher.
It is known that mills can be used to obtain fine particles, but the use of mills for the preparation of aggregates having a controlled particle shape is novel.
The method according to the invention enables aggregates of a controlled particle shape to be obtained. The method according to the invention further offers the advantage that not only the granule shape, but also the chemical composition of the aggregate can be chosen. As is not the case with known aggregates, the desired combination of particle shape and chemical composition of the aggregate can now be obtained. Another advantage offered by the method according to the invention is that the particle size distribution can also be chosen. Although the particle size of the aggregates is not generally subject to limitations, a method is preferred whereby the particles on being crushed have a particle size smaller than 250 microns. More preferred is a method whereby the particles on being crushed have a particle size smaller than 120 or still more preferably smaller than 63 microns. With mixtures of aggregates with at least one aggregate that has been prepared by the method according to the invention any combination of particle shape, particle size distribution and chemical composition in an aggregate mixture can now be obtained.
When such a mixture of aggregates is used in a mortar or concrete it is important that the various aggregates making up the mixture become and remain dispersed homogeneously through the mortar or the concrete. A mixture of aggregates according to the invention is therefore preferably added to concrete in the form of a granulate which disintegrates in an aqueous medium. In particular, the granulate disintegrates in an aqueous medium merely by the effect of the mechanical forces which are always present when a mortar or concrete is being produced, so without any additional forces needing to be exerted on the granulate. A method for the preparation of a granulate is described for instance in EP-A-0881942. By starting from a homogeneous or virtually homogeneous mixture of aggregates to prepare a granulate which comprises the mixture, but in which the mixture cannot precipitate, the correct proportion of aggregates can be added in a simple manner, which moreover ensures that the mortar or the concrete is sufficiently homogeneous for the envisaged application.
All inorganic materials of which known aggregates consist can be used in the method according to the invention. However, it is also possible to use inorganic materials that hitherto have been unavailable as an aggregate. It is preferred for sand or limestone to be used as inorganic material. The mortar, green mortar, concrete or green concrete can contain any known bonding agent. Preferably, cement is used as bonding agent.
The application of the concrete determines the required quantities of aggregate according to the invention, bonding agent and water in the mortar or concrete.
The invention also relates to the use of a grinding device for the manufacture of an aggregate of a controlled particle shape.

Claims

1. Method for the manufacture of aggregates of a controlled particle shape by grinding of inorganic material.
2. Method according to Claim 1 , characterized in that the grinding results particles with a particle size of less than 500 microns.
3. Method according to Claim 1 , characterized in that the grinding results in particles with a particle size of less than 250 microns.
4. Method according to Claim 1 , characterized in that the grinding results in particles with a particle size of less than 120 microns.
5. Method according to Claim 1 , characterized in that the grinding results in particles with a particle size of less than 63 microns.
6. Method for the preparation of a composition which contains an aggregate mixture, a bonding agent and water, characterized in that the aggregate mixture contains at least one aggregate obtained by the method according to the invention.
7. Method according to Claim 6, characterized in that the aggregate mixture is added to the composition in the form of a granulate which disintegrates in an aqueous environment.
8. Use of a grinding device for the manufacture of an aggregate of a controlled particle shape.
PCT/NL2002/000324 2001-05-23 2002-05-23 Method for the manufacture of aggregates and application of aggregates in a mortar or concrete WO2002094427A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1018143A NL1018143C1 (en) 2001-05-23 2001-05-23 Method for making fillers and application of fillers in a mortar or concrete.
NL1018143 2001-05-23

Publications (1)

Publication Number Publication Date
WO2002094427A1 true WO2002094427A1 (en) 2002-11-28

Family

ID=19773446

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2002/000324 WO2002094427A1 (en) 2001-05-23 2002-05-23 Method for the manufacture of aggregates and application of aggregates in a mortar or concrete

Country Status (2)

Country Link
NL (1) NL1018143C1 (en)
WO (1) WO2002094427A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077408A (en) * 1959-12-28 1963-02-12 Pillsbury Co Cereal flour fractionation processes
US4627576A (en) * 1982-04-09 1986-12-09 William F. Hahn Differential rate screening
US5556820A (en) * 1989-12-28 1996-09-17 Idemitsu Petrochemical Co., Ltd. Catalyst component for olefin polymerization and process for producing polyolefins
WO1997033685A1 (en) * 1996-02-14 1997-09-18 Dsm N.V. Method for preparing a mortar

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077408A (en) * 1959-12-28 1963-02-12 Pillsbury Co Cereal flour fractionation processes
US4627576A (en) * 1982-04-09 1986-12-09 William F. Hahn Differential rate screening
US5556820A (en) * 1989-12-28 1996-09-17 Idemitsu Petrochemical Co., Ltd. Catalyst component for olefin polymerization and process for producing polyolefins
WO1997033685A1 (en) * 1996-02-14 1997-09-18 Dsm N.V. Method for preparing a mortar
EP0881942A1 (en) * 1996-02-14 1998-12-09 Dsm N.V. Method for preparing a mortar

Also Published As

Publication number Publication date
NL1018143C1 (en) 2002-11-26

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