WO2002094735A1 - Method for the manufacture of concrete with a high early strength - Google Patents

Method for the manufacture of concrete with a high early strength Download PDF

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Publication number
WO2002094735A1
WO2002094735A1 PCT/NL2002/000325 NL0200325W WO02094735A1 WO 2002094735 A1 WO2002094735 A1 WO 2002094735A1 NL 0200325 W NL0200325 W NL 0200325W WO 02094735 A1 WO02094735 A1 WO 02094735A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
aggregates
composition
early strength
pumice stone
Prior art date
Application number
PCT/NL2002/000325
Other languages
French (fr)
Inventor
Hendrikus Antonius Petrus Kouwenhoven
Original Assignee
Dsm Ip Assets B.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 Ip Assets B.V. filed Critical Dsm Ip Assets B.V.
Publication of WO2002094735A1 publication Critical patent/WO2002094735A1/en

Links

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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/14—Minerals of vulcanic origin
    • C04B14/16—Minerals of vulcanic origin porous, e.g. pumice
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
    • C04B20/008—Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting

Definitions

  • the invention relates to a method for the manufacture of concrete.
  • the invention relates in particular to a method for the manufacture of concrete with a high early strength, to concrete with a high early strength and to application of concrete with a high early strength.
  • 'concrete' within the scope of the present invention is understood a composition which contains a bonding agent, a composition of aggregates, 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. Concrete which has not cured yet is called 'concrete mortar'.
  • the term 'aggregate' is used to indicate an inorganic material which consists of small particles. Aggregate particles in general have a diameter of less than a millimetre, mostly of the order of a few microns to 500 microns. Within the scope of the present application an aggregate preferably has a diameter of 63 microns or less.
  • the desired final strength of the concrete has to be taken into account. But besides the final strength of fully cured concrete, the strength of concrete not yet fully cured is also important. Many concrete mouldings are manufactured by pouring concrete mortar into a mould or formwork. The mould or the formwork cannot be removed until the moulding has cured to such an extent that no or only negligible deformation occurs upon removal of the mould or the formwork. For the purpose of increasing the rate of production of mouldings there is a need for concrete having a high early strength, allowing earlier removal of the mould or the formwork.
  • the 'early strength' is in general understood the strength between 5 and 24 hours after the preparation of the concrete mortar. Within the scope of the present invention, 'early strength' is preferably understood to mean the strength of the concrete between 5 and 8 hours after the preparation of the concrete mortar.
  • the method according to the invention provides a method for the manufacture of concrete whereby the early strength of concrete is improved, while the final strength of the concrete remains unchanged or virtually unchanged. This is achieved in the method according to the invention in that the composition of aggregates comprises at least two different aggregates.
  • the composition of aggregates comprises at least one reactive aggregate.
  • a 'reactive aggregate' is understood to mean an aggregate which is latently hydraulic or puzzolanic. More preferably, the mixture of aggregates is a mixture of pumice stone and limestone flour with a weight percentage of pumice stone of between 30 and 50% and a weight percentage of limestone flour of between 50 and 70%.
  • the optimum composition depends on the desired early strength and on the chemical composition of the pumice stone and the limestone flour. Aggregates from different sources usually do not have exactly the same composition. However, for a person skilled in the art it is easy to determine the optimum proportions for a given type of limestone flour and a given type of pumice stone.
  • pumice stone having a particle diameter of less than 10 microns is used.
  • 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 a need for exertion of additional forces on the granulate.
  • a method for the preparation of a granulate is described for instance in EP-A-0881942.
  • the correct proportion of aggregates can be supplied 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.
  • ground pumice stone and limestone flour are used.
  • the concrete and the concrete mortar can contain any known bonding agent.
  • 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 concrete can be prepared by the known methods.

Abstract

The invention relates to a method for the manufacture of concrete with a high early strength, to concrete with a high early strength and to application of concrete with a high early strength. The method is characterized in that for the manufacture of the concrete, which involves the mixing of a bonding agent, gravel, a composition of aggregates and water, not one aggregate, but two different aggregates are used. More preferably, the two aggregates are limestone flour and pumice stone, with between 30 and 50 weight percent of the total weight of pumice stone and limestone flour being made up of pumice stone and 50 to 70 weight percent of limestone flour.

Description

METHOD FOR THE MANUFACTURE OF CONCRETE WITH A HIGH EARLY STRENGTH
The invention relates to a method for the manufacture of concrete. The invention relates in particular to a method for the manufacture of concrete with a high early strength, to concrete with a high early strength and to application of concrete with a high early strength.
By 'concrete' within the scope of the present invention is understood a composition which contains a bonding agent, a composition of aggregates, 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. Concrete which has not cured yet is called 'concrete mortar'. The term 'aggregate' is used to indicate an inorganic material which consists of small particles. Aggregate particles in general have a diameter of less than a millimetre, mostly of the order of a few microns to 500 microns. Within the scope of the present application an aggregate preferably has a diameter of 63 microns or less.
In the manufacture of concrete the desired final strength of the concrete has to be taken into account. But besides the final strength of fully cured concrete, the strength of concrete not yet fully cured is also important. Many concrete mouldings are manufactured by pouring concrete mortar into a mould or formwork. The mould or the formwork cannot be removed until the moulding has cured to such an extent that no or only negligible deformation occurs upon removal of the mould or the formwork. For the purpose of increasing the rate of production of mouldings there is a need for concrete having a high early strength, allowing earlier removal of the mould or the formwork. By the 'early strength' is in general understood the strength between 5 and 24 hours after the preparation of the concrete mortar. Within the scope of the present invention, 'early strength' is preferably understood to mean the strength of the concrete between 5 and 8 hours after the preparation of the concrete mortar.
It is known that the early strength of concrete can be influenced. However, the known methods of improving the early strength of concrete also have an effect on the final strength of the concrete, i.e. the strength of the fully cured concrete. Concrete with a high early strength therefore also has a high strength when fully cured, which entails the drawback that such concrete readily tears. That is why there is a need for a method for improving the early strength of concrete without the final strength of the concrete being influenced. By the 'final strength' is in general understood the strength 28 days after the preparation of the concrete mortar.
The method according to the invention provides a method for the manufacture of concrete whereby the early strength of concrete is improved, while the final strength of the concrete remains unchanged or virtually unchanged. This is achieved in the method according to the invention in that the composition of aggregates comprises at least two different aggregates.
The composition of aggregates comprises at least one reactive aggregate. Within the scope of the present invention a 'reactive aggregate' is understood to mean an aggregate which is latently hydraulic or puzzolanic. More preferably, the mixture of aggregates is a mixture of pumice stone and limestone flour with a weight percentage of pumice stone of between 30 and 50% and a weight percentage of limestone flour of between 50 and 70%.
The optimum composition depends on the desired early strength and on the chemical composition of the pumice stone and the limestone flour. Aggregates from different sources usually do not have exactly the same composition. However, for a person skilled in the art it is easy to determine the optimum proportions for a given type of limestone flour and a given type of pumice stone. Preferably, pumice stone having a particle diameter of less than 10 microns is used.
When 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 a need for exertion of additional forces 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 supplied 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. Preferably, ground pumice stone and limestone flour are used. The concrete and the concrete mortar 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 concrete can be prepared by the known methods.

Claims

1. Method for the manufacture of concrete wherein a bonding agent, gravel, a composition of aggregates and water are mixed, characterized in that the composition of aggregates comprises at least two different aggregates.
2. Method according to Claim 1 , characterized in that the composition of aggregates comprises at least one reactive aggregate.
3. Method according to Claim 1 or 2, characterized in that the composition of aggregates comprises two aggregates.
4. Method according to Claim 3, characterized in that limestone flower and pumice stone are used as aggregates, with between 30 and 50 weight percent of the total weight being made up of pumice stone and 50 to 70 weight percent of limestone flour.
5. Method according to any one of Claims 1 to 4, characterized in that the pumice stone consists of particles having a diameter of less than 10 microns.
6. Concrete composition comprising a bonding agent, gravel, water and a composition of aggregates, the composition of aggregates comprising at least two different aggregates, of which at least one is a reactive aggregate
7. Concrete composition according to Claim 6, with the composition of aggregates comprising limestone flour and pumice stone, and between 30 and
50 weight percent of the total weight of pumice stone and limestone flour being made up of pumice stone and 50 to 70 weight percent of limestone flour.
PCT/NL2002/000325 2001-05-23 2002-05-23 Method for the manufacture of concrete with a high early strength WO2002094735A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1018142A NL1018142C1 (en) 2001-05-23 2001-05-23 Method for manufacturing concrete with a high young strength.
NL1018142 2001-05-23

Publications (1)

Publication Number Publication Date
WO2002094735A1 true WO2002094735A1 (en) 2002-11-28

Family

ID=19773445

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2002/000325 WO2002094735A1 (en) 2001-05-23 2002-05-23 Method for the manufacture of concrete with a high early strength

Country Status (2)

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NL (1) NL1018142C1 (en)
WO (1) WO2002094735A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2905270A1 (en) * 2014-02-07 2015-08-12 Istanbul Universitesi Rektorlugu Improved concrete composition

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1646547A1 (en) * 1966-10-28 1971-07-22 Gorresens Pty Ltd Hydraulic cement mix and process for its preparation
EP0291108A1 (en) * 1987-05-15 1988-11-17 SNAMPROGETTI S.p.A. Process for producing high-strength mortar
WO1990013524A1 (en) * 1989-05-01 1990-11-15 Aalborg Portland A/S Shaped article with a cement-bound matrix and method and composition for the preparation thereof
FR2673935A1 (en) * 1991-03-13 1992-09-18 Matiere Marcel Process for the manufacture of mortars or concretes and aggregates for making use of the process
JPH04321546A (en) * 1991-04-23 1992-11-11 Ohbayashi Corp Concrete composition
US5776244A (en) * 1996-09-10 1998-07-07 Sandia Corporation Ultrafine cementitious grout
JPH1160298A (en) * 1997-08-21 1999-03-02 Denki Kagaku Kogyo Kk Cement admixture and cement composition
JPH1160310A (en) * 1997-08-12 1999-03-02 Kawasaki Steel Corp Cement composition for centrifugal molding and centrifugally molded body using the same
JPH11139851A (en) * 1997-11-10 1999-05-25 Ohbayashi Corp Mortar or concrete low in heat generation
JP2000211956A (en) * 1999-01-25 2000-08-02 Mitsubishi Materials Corp Cement composition

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1646547A1 (en) * 1966-10-28 1971-07-22 Gorresens Pty Ltd Hydraulic cement mix and process for its preparation
EP0291108A1 (en) * 1987-05-15 1988-11-17 SNAMPROGETTI S.p.A. Process for producing high-strength mortar
WO1990013524A1 (en) * 1989-05-01 1990-11-15 Aalborg Portland A/S Shaped article with a cement-bound matrix and method and composition for the preparation thereof
FR2673935A1 (en) * 1991-03-13 1992-09-18 Matiere Marcel Process for the manufacture of mortars or concretes and aggregates for making use of the process
JPH04321546A (en) * 1991-04-23 1992-11-11 Ohbayashi Corp Concrete composition
US5776244A (en) * 1996-09-10 1998-07-07 Sandia Corporation Ultrafine cementitious grout
JPH1160310A (en) * 1997-08-12 1999-03-02 Kawasaki Steel Corp Cement composition for centrifugal molding and centrifugally molded body using the same
JPH1160298A (en) * 1997-08-21 1999-03-02 Denki Kagaku Kogyo Kk Cement admixture and cement composition
JPH11139851A (en) * 1997-11-10 1999-05-25 Ohbayashi Corp Mortar or concrete low in heat generation
JP2000211956A (en) * 1999-01-25 2000-08-02 Mitsubishi Materials Corp Cement composition

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 118, no. 12, 22 March 1993, Columbus, Ohio, US; abstract no. 108537z, page 438; XP000353843 *
DATABASE WPI Week 199919, Derwent World Patents Index; AN 1999-225922, XP002213601 *
DATABASE WPI Week 199919, Derwent World Patents Index; AN 1999-225933, XP002213599 *
DATABASE WPI Week 199932, Derwent World Patents Index; AN 1999-374515, XP002213600 *
PATENT ABSTRACTS OF JAPAN vol. 200, no. 011 2 January 2001 (2001-01-02) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2905270A1 (en) * 2014-02-07 2015-08-12 Istanbul Universitesi Rektorlugu Improved concrete composition

Also Published As

Publication number Publication date
NL1018142C1 (en) 2002-11-26

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