WO2017167321A1 - Béton à teneur réduite en ciment et procédé de production de béton à teneur réduite en ciment - Google Patents

Béton à teneur réduite en ciment et procédé de production de béton à teneur réduite en ciment Download PDF

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Publication number
WO2017167321A1
WO2017167321A1 PCT/DE2017/000076 DE2017000076W WO2017167321A1 WO 2017167321 A1 WO2017167321 A1 WO 2017167321A1 DE 2017000076 W DE2017000076 W DE 2017000076W WO 2017167321 A1 WO2017167321 A1 WO 2017167321A1
Authority
WO
WIPO (PCT)
Prior art keywords
cement
proportion
less
concrete
water
Prior art date
Application number
PCT/DE2017/000076
Other languages
German (de)
English (en)
Inventor
Helmut ROSENLÖCHER
Dagmar TRETBAR
Original Assignee
HALSER, Leopold
DATTINGER, Florian
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 HALSER, Leopold, DATTINGER, Florian filed Critical HALSER, Leopold
Publication of WO2017167321A1 publication Critical patent/WO2017167321A1/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
    • 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
    • C04B28/04—Portland cements
    • 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
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
    • 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
    • C04B40/005—High shear mixing; Obtaining macro-defect free materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the invention relates to a method for the production of cement-reduced concrete according to the features of claim 1 and a cement-reduced concrete according to the features of claim 10.
  • the fines in the aggregates - with fines are particles with a size of less than 0.125 mm - have a high water retention capacity. Due to the water retention capacity of the fine fraction of conventional concrete production water is delivered in an insufficient amount of cement, so that the initially still liquid concrete is stiff and poorly workable.
  • a further object of the invention is to propose a cement-reduced concrete which meets the requirements of the technical regulations and the requirements with regard to processability.
  • the object is achieved with a method having the features of claim 1 and with a cement-reduced concrete having the features of claim 10.
  • Advantageous embodiments and further developments of the invention can be realized with features designated respectively in the subordinate claims.
  • the procedure is such that, in a first step, a proportion of water, a mineral content comprising cement and at least one cement substituent, and a proportion of flow agent are suspended in a suspension mixer to provide a binder suspension.
  • the mineral content may preferably contain particles of a size smaller than 0.125 mm.
  • a share of impactor in which the proportion of particles having a size smaller than 0.125 mm is less than 10%, preferably less than 5%.
  • the proportion of additive is mixed with the proportion of binder suspension.
  • the proportion of particles having a size smaller than 0.125 mm in the context of the invention may be referred to as fines or fines.
  • fines or fines the proportion of particles having a size smaller than 0.125 mm in the context of the invention.
  • cement-reduced fresh concretes can thereby be provided, which have improved flowability and, consequently, a higher settling flow rate and slump without the need to additionally supply water to the mixture.
  • the mineral content which is formed from a proportion of cement and at least a proportion of cement substituent, exclusively on particles having a size smaller than 0.125 mm.
  • a sand and / or gravel fines fraction with particles smaller than 0.125 mm can be used as the cement substituent, the sand used and / or the gravel used being provided as an additive in the second process step.
  • the separate suspension mixing of the mineral content which according to one embodiment of the method according to the invention can exclusively comprise particles with a size smaller than 0.125 mm, it is ensured in the first process step that the particles contained in the mixture are completely in contact with water come and thereby can form a water jacket around the particles.
  • clumping and agglomeration of particles can thereby be avoided, so that a particularly homogeneous binder suspension is provided.
  • the binder suspension in the third process step comes into direct contact with the surface of the coarser constituents of the aggregate and bonds them together without the properties of the binder suspension being influenced by further fines.
  • the concretes produced by the process according to the invention are suitable as ready-mixed concrete or as concretes for the production of precast concrete parts.
  • a concrete produced by the process according to the invention can be used as ready-mixed concrete.
  • a concrete mixture can be provided which is particularly suitable for the production of precast concrete parts.
  • the process according to the invention can be carried out by a dual concrete mixing technique in which, in the first step, the binder suspension, which can also be referred to as a glue component, is prepared in a separate suspension mixer under defined conditions.
  • the binder suspension may be provided at a stirring speed of a stirring tool of the slurry mixer of more than 600 rpm. Particularly advantageous is a stirring speed in the range of 600 rev / min to 1600 rev / min prove.
  • the binder suspension or glue component prepared in this way is combined with the additive (s) in a conventional mixer and mixed to form a homogeneous liquid concrete mixture.
  • ground minerals preferably limestone flour
  • dolomite, blast furnace slag, fly ash, silica fume and / or fine sand with a particle size smaller than 0.125 mm is / are used as the cement substituent.
  • inert and / or reactive additives such as trass, fly ash or silicate dust in the mineral content.
  • sand or gravel is used as an additive in which the proportion of particles having a size smaller than 0.125 mm is less than 10%, preferably less than 5%.
  • water and cement can be used in a proportion of less than 0.6, wherein a proportion of water and mineral content of less than 0.45 is maintained.
  • the numerical value of the proportion of water and cement is the quotient of the water content and the cement content.
  • the numerical value of the proportions of water and mineral content is the quotient of the water content and the mineral content.
  • a reduced cement content of less than 300 kg / m 3 , preferably less than 250 kg / m 3 can be used.
  • cement and cement substituent can be used in equal proportions, so be used in the same ratio. In this case, half of the usual cement content is replaced by the cement substituent. In this case, the quotient of the proportion of cement and cement substituent is 1, 0. As a result, concrete mixtures can be provided that meet the legal requirements with regard to emission limit values for carbon dioxide.
  • Aggregates such as sand or gravel usually contain fines (fractions with particle sizes smaller than 0, 125 mm) in the
  • Matrix is formed.
  • the fines in the aggregate in particular the proportions with particle sizes less than 0, 125 mm attributable to Bindeschleim or the Leimkomponente, as these in combination with the cement and other additives in the concrete mix as a carrier or as binder for the larger grain larger serve as 1, 0 mm.
  • the proportion of aggregate is provided by sieving a bulk material.
  • the sieved fines the so-called sieve bottom with a particle size smaller than 0.125 mm can be used as a cement substituent in the first step.
  • a vibrating screen with a hole size of up to 1 mm can be used.
  • a plurality of sieve steps with different hole sizes are carried out in order to obtain fractions having different particle sizes.
  • the provision of the aggregate can be carried out by sieving as a preparation step before the first process step or as an intermediate step.
  • the invention further comprises a cement-reduced concrete produced by the method according to the invention.
  • the cement-reduced concrete is a mixture of a proportion of binder suspension consisting of proportions of water, mineral, comprising cement and at least one cement substituent, and flow agent, and a proportion of aggregate, wherein in the aggregate, the proportion of particles having a size less than 0.125 mm is less than 10%, preferably less than 5%.
  • the cement substituent may be selected from a group consisting of limestone meal, dolomite, blastfurnace slag, fly ash, silica fume and fine sand having a particle size smaller than 0.125 mm.
  • suitable cement substituents has the advantage that the cement content of the concrete according to the invention can be reduced, with at the same time demanded technological properties or processing properties of the concrete can be met.
  • the aggregate can be sand and / or gravel and have a grain size of 1 mm or larger.
  • a flow agent may have a minimum proportion of 2 kg / m 3 .
  • the technological properties of the concrete mix can be influenced.
  • water and cement are maintained in a proportion of less than 0.6, wherein a proportion of water and mineral content of less than 0.45 is complied with.
  • the concrete of the invention may have a water cement value of less than 0.6.
  • the cement content may be less than 300 kg / m 3 , preferably less than 250 kg / m 3 .
  • cement and cement substituent are used in the same ratio.
  • Formulation examples 1 and 2 are shown, which correspond to the prior art.
  • Table A below shows two recipe examples 1 and 2 for concrete compositions according to conventional mixing technique for the production of 1 m 3 of concrete.
  • Table A is used as an aggregate sand or gravel with grain sizes from 0 to X mm, where X can assume values of 2 to 8.
  • Table B below shows two recipe examples 3 and 4 for concrete compositions according to the invention for the production of 1
  • a first step 140 kg of water and a mineral content which has a content of 250 kg cement CEM I 42.5 R and a content of 200 kg limestone flour, with the addition of 3.6 kg of a superplasticizer, such as Superplaticizer, in a suspension mixer at a speed of rotation of the agitating tool of 600 U / min suspended to 1600 rev / min, wherein a binder suspension is provided.
  • a second step 1620 kg of sand or gravel is provided as an aggregate, wherein the aggregate in the present example has a particle size of 1 mm to 8 mm and the proportion of particles having a size smaller than 0.125 mm is less than 10%.
  • the additive thus provided and the binder suspension provided in the first step are mixed together in a third step in a conventional mixer until a desired consistency is achieved.
  • the aggregate having the desired particle size can be produced directly by sieving. According to a further embodiment variant, however, it is also possible to provide for the use of a mixture of admixtures, wherein in the finished mixture the proportion of particles having a size smaller than 0.125 mm is less than 10%, preferably less than 5%. Ideally, sand or gravel is used as an aggregate that does not have any particles with a size of 0.125 mm.
  • a subset of these fines is replaced according to the invention by an increased proportion of concrete additives or binders, according to the present examples by limestone.
  • the surfaces of the mineral fines of the binder are activated by mechanical friction resulting from the suspension process to provide a reactive and stable water-binder suspension as a result.
  • This surface activation of the mineral fine constituents of the binder ensures that the concentrated binder suspension produced in this way can be used for a quality-optimized concrete mixture, but essentially for the bonding of the aggregates sand and gravel.
  • Table C compares another recipe example 6 for a concrete composition according to the invention for producing 1 m 3 of concrete by the process according to the invention and a formulation example 5 for a concrete composition according to a conventional preparation process.
  • Table C shows a recipe comparison C 30/37 XC2, F52, GK 22.
  • Table C Formulation example 5 Formulation example 6 (conventional manufacture (dual concrete mixing technique) nik (suspension concrete))
  • Table D shows another recipe compared SCC 40/50 B2 GK 16 mm, wherein Formulation Example 7 ff according to the conventional M M ilt ne r r ASOA ethod and Formulation Example 8 after dual concrete mixing technique (suspension concrete) is made.
  • Table E shows an optimization variant for C30 / 37 GK 8 mm
  • cement-reduced concretes meet the technological requirements and have improved processing properties.

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

Abstract

L'invention concerne un procédé de production de béton à teneur réduite en ciment, selon lequel dans une première étape, on met en suspension dans un mélangeur de suspension une part d'eau, une part de substance minérale comprenant du ciment et au moins un substituant du ciment, et une part de fluidifiant, et on prépare une suspension de liants. Dans une seconde étape, on prépare une part d'adjuvant, la part de particules présentant une taille inférieure à 0,125 mm étant inférieure à 10 %, de préférence inférieure à 5 %, et dans une troisième étape, la part d'adjuvant est mélangée à la part de suspension de liants. L'invention concerne par ailleurs un procédé de production de béton à teneur réduite en ciment.
PCT/DE2017/000076 2016-03-29 2017-03-27 Béton à teneur réduite en ciment et procédé de production de béton à teneur réduite en ciment WO2017167321A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016003644.3A DE102016003644B4 (de) 2016-03-29 2016-03-29 Verfahren zur Herstellung von zementreduziertem Beton und zementreduzierte Betonmischung
DE102016003644.3 2016-03-29

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Publication Number Publication Date
WO2017167321A1 true WO2017167321A1 (fr) 2017-10-05

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DE (1) DE102016003644B4 (fr)
WO (1) WO2017167321A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3581549A1 (fr) * 2018-06-15 2019-12-18 Holcim Technology Ltd. Composition de béton frais pour enrober des câbles électriques souterrains
WO2023130182A1 (fr) * 2022-01-07 2023-07-13 Universite Laval Béton à haute résistance et son procédé de production

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020132015A1 (de) 2020-12-02 2022-06-02 Sonocrete GmbH Vorrichtung und Verfahren zur Herstellung eines Betons, insbesondere eines Betons mit hoher Frühfestigkeit
WO2022117571A1 (fr) 2020-12-02 2022-06-09 Sonocrete GmbH Dispositif et procédé de production de béton, en particulier de béton à haute résistance initiale
DE102021108917A1 (de) 2021-04-09 2022-10-13 Sonocrete GmbH Vorrichtung und Verfahren zur Herstellung eines Betons, insbesondere eines Betons mit hoher Frühfestigkeit
DE102021006575A1 (de) 2021-04-07 2022-10-13 Hypercon Solutions Gmbh Anlage und Verfahren zur Herstellung von Fertigbeton oder daraus gefertigten Produkten
DE202021004053U1 (de) 2021-04-07 2022-08-17 Hypercon Solutions Gmbh Anlage zur Herstellung von Fertigbeton oder daraus gefertigten Produkten

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060207479A1 (en) * 2005-03-21 2006-09-21 Hughes Felix A Concrete compositions
RU2307810C1 (ru) * 2006-02-20 2007-10-10 Сергей Павлович Горбунов Бетонная смесь и способ ее приготовления
EP1903014A1 (fr) * 2006-09-20 2008-03-26 Lafarge Composition de béton à faible retrait
US20120024198A1 (en) * 2009-03-24 2012-02-02 Lafarge Concrete with a low clinker content
WO2013037792A1 (fr) * 2011-09-12 2013-03-21 Italcementi S.P.A. Produit cimentaire de faible épaisseur présentant des qualités de surface élevées pour des applications non structurelles et son procédé de fabrication
DE102012105071A1 (de) 2012-06-12 2013-12-12 Technische Universität Darmstadt Transportbeton mit einem geringen Zementgehalt
US20140097557A1 (en) * 2012-10-09 2014-04-10 King Saud University Cement composition containing dune sand and limestone powder, concrete products and method for making concrete products
WO2015055879A1 (fr) * 2013-10-14 2015-04-23 Abengoa Solar New Technologies, S.A. Composition de béton réfractaire

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1232862B (de) * 1960-02-12 1967-01-19 Eirich Gustav Verfahren zur Herstellung von Frischbeton
DE102007027080B4 (de) * 2007-06-12 2011-06-30 Lörke, Paul, Dr., 51109 Verfahren zum Herstellen von Betonmischungen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060207479A1 (en) * 2005-03-21 2006-09-21 Hughes Felix A Concrete compositions
RU2307810C1 (ru) * 2006-02-20 2007-10-10 Сергей Павлович Горбунов Бетонная смесь и способ ее приготовления
EP1903014A1 (fr) * 2006-09-20 2008-03-26 Lafarge Composition de béton à faible retrait
US20120024198A1 (en) * 2009-03-24 2012-02-02 Lafarge Concrete with a low clinker content
WO2013037792A1 (fr) * 2011-09-12 2013-03-21 Italcementi S.P.A. Produit cimentaire de faible épaisseur présentant des qualités de surface élevées pour des applications non structurelles et son procédé de fabrication
DE102012105071A1 (de) 2012-06-12 2013-12-12 Technische Universität Darmstadt Transportbeton mit einem geringen Zementgehalt
US20140097557A1 (en) * 2012-10-09 2014-04-10 King Saud University Cement composition containing dune sand and limestone powder, concrete products and method for making concrete products
WO2015055879A1 (fr) * 2013-10-14 2015-04-23 Abengoa Solar New Technologies, S.A. Composition de béton réfractaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ROUGREAU P ET AL: "UHPC with ultrafine particles other than silica fume", PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON ULTRA HIGH PERFORMANCE CONC, UNIV. PRESS, DE, 1 January 2004 (2004-01-01), pages 213 - 225, XP008112203, ISBN: 978-3-89958-086-0 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3581549A1 (fr) * 2018-06-15 2019-12-18 Holcim Technology Ltd. Composition de béton frais pour enrober des câbles électriques souterrains
WO2019239339A1 (fr) * 2018-06-15 2019-12-19 Holcim Technology Ltd Utilisation d'une composition de béton frais pour l'enrobage de câbles électriques souterrains
WO2023130182A1 (fr) * 2022-01-07 2023-07-13 Universite Laval Béton à haute résistance et son procédé de production

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DE102016003644B4 (de) 2019-10-17
DE102016003644A1 (de) 2017-10-05

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