DE102010011713A1 - Self-compacting concrete comprises portion of blast furnace cement, which contains portion of Portland cement clinker and portion of blast furnace slag, portion of limestone flour, and portion of coarse aggregate made of sand or gravel - Google Patents

Abstract

The self-compacting concrete comprises a portion of 340 kg blast furnace cement per m 3>concrete, where the blast furnace cement contains a portion of Portland cement clinker (20-34%) and a portion of blast furnace slag (66-80%), a portion of 300 kg limestone flour per m 3>concrete, a portion of 1400 kg coarse aggregate made of sand, gravel or crushed stone per m 3>concrete, where the coarse aggregate has an aggregate size of maximum 8 mm, a styrene-acrylate copolymer with a portion of 5-15% to the mass of the blast furnace cement, and a high performance solvent. The self-compacting concrete comprises a portion of 340 kg blast furnace cement per m 3>concrete, where the blast furnace cement contains a portion of Portland cement clinker (20-34%) and a portion of blast furnace slag (66-80%), a portion of 300 kg limestone flour per m 3>concrete, a portion of 1400 kg coarse aggregate made of sand, gravel or crushed stone per m 3>concrete, where the coarse aggregate has an aggregate size of maximum 8 mm, a styrene-acrylate copolymer with a portion of 5-15% to the mass of the blast furnace cement, a high performance solvent based on polycarboxylate ether with a portion of maximum 2% to the mass of the blast furnace cement and with a water/cement ratio of maximum 0.5, and color pigments. An independent claim is included for a method for producing a self-compacting concrete.

Description

The invention relates to a self-compacting concrete according to the features of the preamble of claim 1, a method for its production according to the features of the preamble of claim 3 and a method for producing a concrete layer according to the features of the preamble of claim. 5

From the state of the art it is known to apply a mortar-based layer in plaster on surfaces to be repaired or repaired or to repair such surfaces with a shotcrete layer.

A disadvantage of the previous solutions is that in the renovation / repair of listed concrete surfaces / facades often required original structures can not be produced. The surface does not correspond to a switched concrete surface. In addition, limited accessibility often prevents proper remediation. The invention is based on the object of specifying an improved self-compacting concrete, an improved process for its production and an improved process for producing a concrete layer.

The object is achieved by a self-compacting concrete having the features of claim 1, a method for producing a self-compacting concrete with the features of claim 3 and a method for producing a concrete layer having the features of claim 5.

Advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention, a self-compacting concrete has a proportion of at least 340 kg of blast-furnace cement per m ^{3 of} concrete, the blast-furnace cement having a proportion of 20% to 34% Portland cement clinker and a proportion of 66% to 80% blastfurnace slag. The blast furnace cement has a compressive strength of at least 32.5 N / mm ² and a maximum of 52.5 N / mm ² after 28 days. Such a blast furnace cement is known under the standardized name cement CEM III / B 32.5 N.

Furthermore, according to the invention, the self-compacting concrete has a proportion of at least 300 kg of limestone powder per m ^{3 of} concrete, preferably the limestone flour known under the name MS Easyflow I from sh minerals.

Furthermore, the self-compacting concrete according to the invention has a proportion of at least 1400 kg of aggregate of sand, gravel or grit per m ^{3 of} concrete, wherein the aggregate has a maximum grain size of 8 mm maximum. A maximum grain size of 8 mm means that a maximum diameter of the stones or grains of the aggregate is 8 mm maximum. The aggregate is preferably porphyry gravel, which has a low elastic modulus.

The self-compacting concrete also contains a styrene-acrylate copolymer according to the invention with a proportion of 5% to 15%, preferably 5%, of the mass of the blastfurnace cement. Such a copolymer is known, for example, as a dispersion under the name Mowilith LDM 6880 and has a solids content of about 50%. This self-compacting concrete is polymer modified by this styrene-acrylate copolymer.

Furthermore, according to the invention, the self-compacting concrete has a high-performance flow agent based on polycarboxylate ether with a proportion of not more than 2% of the mass of the blastfurnace cement, preferably about 4 kg per m ^{3 of} concrete. Such a flow agent is known as SIKA Viscocrete 2600. If necessary, an exact dosage should be adapted in each case by tests in order to ensure optimum flowability of the self-compacting concrete.

The self-compacting concrete also has, according to the invention, a water / cement ratio of not more than 0.5.

The values of the above-mentioned formulation of the self-compacting concrete refer to the concrete during mixing or immediately after mixing and before applying the self-compacting concrete to a surface to be coated. After application to the surface to be coated hardens and dries the concrete, so that in particular changes the water-cement ratio.

This polymer-modified self-compacting concrete is particularly suitable for creating thin concrete layers in the context of renovation and repair tasks, especially on vertical surfaces. By means of this polymer-modified self-compacting concrete, shuttering structures similar to an original surface can also be designed visibly on redeveloped surfaces. A concrete layer of this polymer-modified self-compacting concrete is also usable as a concrete repair layer having a final surface.

By means of the polymer-modified self-compacting concrete, an actual load-bearing concrete structure, to which it is applied, can be estimated and it is a faithful geschalte concrete surface produced.

Due to its rheological properties, the polymer-modified self-compacting concrete applied to a surface to be repaired leveled automatically and vented, so that no additional compaction energy had to be applied.

By the polymer modification, a better stability of the formulation of the self-compacting concrete is achieved and adhesion of the self-compacting concrete to the surface to be repaired is significantly improved compared to materials according to the prior art.

Due to its composition, the polymer-modified self-compacting concrete also has a very high fatigue strength, as a result of which a future refurbishment effort of a surface renovated with the polymer-modified self-compacting concrete is significantly reduced and a much longer period of time until a renewed necessary refurbishment can be achieved.

In an advantageous embodiment, the polymer-modified self-compacting concrete has color pigments. In this way, a respective desired color of the polymer-modified self-compacting concrete can be produced. Due to a very light concrete base color due to the blast furnace cement CEM III / B 32.5 N, the polymer-modified self-compacting concrete has a very good colorability with color pigments, so that the polymer-modified self-compacting concrete is very well adaptable to the respective color requirements.

In a method for producing a self-compacting concrete according to the invention, a proportion of at least 340 kg of blast furnace cement per m ^{3 of} concrete, the blast furnace cement having a proportion of 20% to 34% Portland cement clinker and a proportion of 66% to 80% blastfurnace slag, a proportion of at least 300 kg of limestone powder per m ^{3 of} concrete, a minimum of 1400 kg of aggregate of sand, gravel or grit per m ^{3 of} concrete, the aggregate having a maximum grain size of 8 mm, a styrene-acrylate copolymer with a content of 5% to 15%, preferably 5%, of the mass of the blastfurnace cement, a high-performance flow agent based on polycarboxylate with a proportion of not more than 2% of the mass of blast furnace cement, preferably about 4 kg per m ^{3 of} concrete, and water in a water / cement ratio of a maximum of 0.5 mixed.

The blast furnace cement has a compressive strength of at least 32.5 N / mm ² and a maximum of 52.5 N / mm ² after 28 days. Such a blast furnace cement is known under the standardized name cement CEM III / B 32.5 N.

The limestone flour used is preferably the limestone flour known under the name MS Easyflow I from sh minerals.

The aggregate is preferably porphyry gravel, which has a low elastic modulus. A maximum grain size of 8 mm means that a maximum diameter of the stones or grains of the aggregate is 8 mm maximum.

The styrene-acrylate copolymer is known, for example, as a dispersion under the name Mowilith LDM 6880 and has a solids content of about 50%. This self-compacting concrete is polymer modified by this styrene-acrylate copolymer.

The high performance fluid is known as SIKA Viscocrete 2600. If necessary, an exact dosage should be adapted in each case by tests in order to ensure optimum flowability of the self-compacting concrete.

This polymer-modified self-compacting concrete, which is preferably mixed in a compulsory mixer, is particularly suitable for creating thin concrete layers in the context of renovation and repair tasks, in particular on vertical surfaces. By means of this polymer-modified self-compacting concrete formwork structures similar to an original surface can also be made visible on redeveloped surfaces. A concrete layer of this polymer-modified self-compacting concrete may also be used as a concrete repair layer with a final surface.

By means of the mixed polymer-modified self-compacting concrete, an actual load-bearing concrete structure, to which it is applied after mixing, can be protected and a faithfully cast concrete surface can be produced.

Due to its rheological properties, the polymer-modified self-compacting concrete applied to a surface to be repaired leveled automatically and vented, so that no additional compaction energy had to be applied.

By the polymer modification, a better stability of the formulation of the self-compacting concrete is achieved and adhesion of the self-compacting concrete to the surface to be repaired is significantly improved over prior art materials.

Due to its composition, the polymer-modified self-compacting concrete also has a very high fatigue strength, as a result of which a future refurbishment effort of a surface renovated with the polymer-modified self-compacting concrete is significantly reduced and a much longer period of time until a renewed necessary refurbishment can be achieved.

In an advantageous embodiment, color pigments are added and mixed. In this way, a respective desired color of the polymer-modified self-compacting concrete can be produced. Due to a very light concrete base color due to the blast furnace cement CEM III / B 32.5 N, the polymer-modified self-compacting concrete has a very good Einfürbbarkeit with color pigments, so that the polymer-modified self-compacting concrete can be very well color matched to specific requirements.

In a method for producing a concrete layer according to the invention is a self-compacting concrete with a share of at least 340 kg blast furnace cement per m ³ concrete, the blast furnace cement has a share of 20% to 34% Portland cement clinker and a share of 66% to 80% blastfurnace slag a proportion of at least 300 kg limestone dust per m ³ of concrete, with a proportion of at least 1,400 kg of rock grains of sand, gravel or crushed material per m ³ of concrete, the aggregate having a maximum particle size of at most 8 mm, with a styrene-acrylate copolymer having a proportion of 5% to 15%, preferably 5%, of the mass of the blastfurnace cement, with a high-performance flow agent based on polycarboxylate with a maximum proportion of 2% of the mass of blastfurnace cement, preferably about 4 kg per m ^{3 of} concrete, and with a Water / cement ratio of a maximum of 0.5 applied to a surface to be coated of a component.

The blast furnace cement has a compressive strength of at least 32.5 N / mm ² and a maximum of 52.5 N / mm ² after 28 days. Such a blast furnace cement is known under the standardized name cement CEM III / B 32.5 N.

The limestone flour used is preferably the limestone flour known under the name MS Easyflow I from sh minerals.

The aggregate is preferably porphyry gravel, which has a low elastic modulus. A maximum grain size of 8 mm means that a maximum diameter of the stones or grains of the aggregate is 8 mm maximum.

The styrene-acrylate copolymer is known, for example, as a dispersion under the name Mowilith LDM 6880 and has a solids content of about 50%. This self-compacting concrete is polymer modified by this styrene-acrylate copolymer.

The high performance fluid is known as SIKA Viscocrete 2600. If necessary, an exact dosage should be adapted in each case by tests in order to ensure optimum flowability of the self-compacting concrete.

This polymer-modified self-compacting concrete is particularly suitable for creating thin concrete layers in the context of renovation and repair tasks, especially on vertical surfaces. The concrete layer of this polymer-modified self-compacting concrete may also be used as a concrete repair layer with a final surface.

By means of the mixed polymer-modified self-compacting concrete, an actual load-bearing concrete structure, to which it is applied after mixing, can be protected and a faithfully cast concrete surface can be produced.

By the polymer modification, a better stability of the formulation of the self-compacting concrete is achieved and adhesion of the self-compacting concrete to the surface to be repaired is significantly improved over prior art materials.

Due to its composition, the polymer-modified self-compacting concrete also has a very high fatigue strength, as a result of which a future refurbishment effort of a surface renovated with the polymer-modified self-compacting concrete is significantly reduced and a much longer period of time until a renewed necessary refurbishment can be achieved.

In an advantageous embodiment, the polymer-modified self-compacting concrete has color pigments. In this way, a respective desired color of the polymer-modified self-compacting concrete can be produced. Due to a very light concrete base color due to the blast furnace cement CEM III / B 32.5 N, the polymer-modified self-compacting concrete has a very good colorability with color pigments, so that the polymer-modified self-compacting concrete can be very well color matched to specific requirements.

Conveniently, a formwork is arranged at a predetermined distance from the surface to be coated of the component and the polymer-modified self-compacting concrete is through Filling in a cavity between the formwork and the surface to be coated of the component applied to the surface to be coated of the component. The formwork is preferably arranged at a predetermined distance of at least 2.5 cm to the surface of the component to be coated and has a smooth surface or, in a particularly advantageous embodiment, a structured surface.

A formwork material depends on a respective desired surface structure of the concrete surface of the polymer-modified self-compacting concrete and is for example plastic, metal or more preferably wood, as in this way also a grain of the wood on the concrete surface of the polymer-modified self-compacting concrete, d. H. can be made visible on the renovated surface as a relief in the polymer-modified self-compacting concrete. As a result, by means of the polymer-modified self-compacting concrete formwork structures similar to an original surface can also be made visible on redeveloped surfaces.

If the polymer-modified self-compacting concrete is filled between the formwork and the surface to be coated, it automatically levels out due to its rheological properties and vented, so that no additional compaction energy is required. The distance between the formwork and the surface to be coated may be constant over a longitudinal extent and / or over a transverse extent of the surface to be coated, or different distances may occur. However, a minimum distance of 2.5 cm must be maintained everywhere.

The polymer-modified self-compacting concrete is particularly advantageously used on a surface to be coated of the component, which is oriented substantially vertically. However, it can also be used on differently oriented surfaces, for example on horizontally oriented surfaces.

Embodiments of the invention are explained in more detail below with reference to drawings.

Show:

1 a schematic sectional view of a surface to be coated of a component, a formwork and a concrete layer of a polymer-modified self-compacting concrete, and

2 a schematic representation of a concrete surface coated with a polymer-modified self-compacting concrete surface.

Corresponding parts are provided in all figures with the same reference numerals.

1 shows a schematic sectional view of a surface to be coated 1 a component 2 , a formwork 3 and a concrete layer 4 from a polymer-modified self-compacting concrete. The component 2 is for example a vertical house wall to be rehabilitated, on which the thin concrete layer 4 is to be applied.

To produce the polymer-modified self-compacting concrete, a proportion of at least 340 kg of blast-furnace cement per m ^{3 of} concrete, the blast furnace cement has a proportion of 20% to 34% Portland cement clinker and a proportion of 66% to 80% blastfurnace slag, a proportion of at least 300 kg of limestone per m ^{3 of} concrete, a minimum of 1400 kg of aggregate of sand, gravel or grit per m ^{3 of} concrete, the aggregate having a maximum particle size not exceeding 8 mm, a styrene-acrylate copolymer containing 5% to 15%, preferably 5%, the mass of the blastfurnace cement, a high-performance flow agent based on polycarboxylate ether with a proportion of not more than 2% of the mass of the blastfurnace cement, preferably about 4 kg per m ^{3 of} concrete, and water in a water / cement ratio of not more than 0, 5 particularly preferably mixed in a compulsory mixer or in exceptional cases, for example, in a free-fall mixer.

The blast furnace cement has a compressive strength of at least 32.5 N / mm ² and a maximum of 52.5 N / mm ² after 28 days. Such a blast furnace cement is known under the standardized name cement CEM III / B 32.5 N.

The limestone flour used is preferably the limestone flour known under the name MS Easyflow I from sh minerals.

The aggregate is preferably porphyry gravel, which has a low elastic modulus. A maximum grain size of 8 mm means that a maximum diameter of the stones or grains of the aggregate is 8 mm maximum.

The styrene-acrylate copolymer is known, for example, as a dispersion under the name Mowilith LDM 6880 and has a solids content of about 50%. This self-compacting concrete is polymer modified by this styrene-acrylate copolymer.

The high performance fluid is known as SIKA Viscocrete 2600. If necessary, an exact dosage should be adapted in each case by tests in order to ensure optimum flowability of the self-compacting concrete.

By the polymer modification, a better stability of the formulation of the self-compacting concrete is achieved and adhesion of the self-compacting concrete to the surface to be coated 1 is significantly improved over prior art materials.

Due to its composition, the polymer-modified self-compacting concrete also has a very high fatigue strength, as a result of which a future refurbishment effort of a surface renovated with the polymer-modified self-compacting concrete is significantly reduced and a much longer period of time until a renewed necessary refurbishment can be achieved.

In addition, color pigments can be added to the polymer-modified self-compacting concrete in order to produce a respectively desired color of the polymer-modified self-compacting concrete or of the surface to be coated 1 of the component 2 applied concrete layer 4 to reach. Due to a very light concrete base color due to the blast furnace cement CEM III / B 32.5 N, the polymer-modified self-compacting concrete has a very good colorability with color pigments, so that the polymer-modified self-compacting concrete can be very well color matched to specific requirements.

To the polymer-modified self-compacting concrete on the surface to be coated 1 of the component 2 apply the formwork 3 at a predetermined distance of at least 2.5 cm to the surface to be coated 1 of the component 2 arranged. The distance between the formwork 3 and the area to be coated 1 can be over a longitudinal extent and / or over a transverse extent of the surface to be coated 1 be consistent or different distances may occur. However, a minimum distance of 2.5 cm must be maintained everywhere.

The formwork 3 is for example made of plastic, metal or wood and has in the example shown here a structured surface 5 on. In a formwork 3 Wood, for example, already has a grain of wood as a structured surface 5 usable. In this way, the grain of the wood on a concrete surface 6 the concrete layer 4 made of polymer-modified self-compacting concrete, ie on the rehabilitated surface as a surface structure 7 be made visible in the polymer-modified self-compacting concrete, as in 2 shown in more detail. As a result, by means of the polymer-modified self-compacting concrete formwork structures similar to an original surface can also be made visible on redeveloped surfaces.

The polymer-modified self-compacting concrete is made by filling in a cavity between the formwork 3 and the area to be coated 1 of the component 2 on the surface to be coated 1 applied. Due to its rheological properties, it leveled automatically and vented, so that no additional compaction energy is required.

The polymer-modified self-compacting concrete is, as shown here, particularly advantageous on a surface to be coated 1 of the component 2 can be used, which is oriented substantially vertically. However, it can also be used on differently oriented surfaces, for example on horizontally oriented surfaces.

In 2 is the concrete surface 6 the surface coated with polymer-modified self-compacting concrete 1 schematically illustrated and has a structured surface 5 the formwork 3 corresponding surface structure 7 as a relief.

LIST OF REFERENCE NUMBERS

1

to be coated surface

2

component

3

formwork

4

concrete layer

5

structured surface

6

concrete surface

7

surface structure

Claims (10)

Self-compacting concrete, containing at least 340 kg of blast-furnace cement per m ^{3 of} concrete, the blast-furnace cement having a content of 20% to 34% Portland cement clinker and a proportion of 66% to 80% blastfurnace slag, containing at least 300 kg of limestone flour per m ³ of concrete, with a proportion of at least 1,400 kg of rock grains of sand, gravel or crushed material per m ^{3 of} concrete, the aggregate having a maximum particle size of at most 8 mm, with a styrene-acrylate copolymer in a proportion of 5% to 15% of the Mass of the blastfurnace cement, with a high-performance flow agent based on polycarboxylate ether with a proportion of not more than 2% of the mass of the blastfurnace cement and with a maximum water / cement ratio of 0.5. Self-compacting concrete according to claim 1, characterized by color pigments. A method for producing a self-compacting concrete, characterized in that a proportion of at least 340 kg blast furnace cement per m ^{3 of} concrete, wherein the blast furnace cement a share from 20% to 34% Portland cement clinker and a proportion of 66% to 80% blastfurnace slag, a proportion of at least 300 kg of limestone powder per m ^{3 of} concrete, a proportion of at least 1400 kg of aggregate of sand, gravel or grit per m ^{3 of} concrete, where the aggregate has a maximum grain size of not more than 8 mm, a styrene-acrylate copolymer containing 5% to 15% of the mass of the blastfurnace cement, a high performance flux based on polycarboxylate ether containing not more than 2% of the mass of the blastfurnace cement and water in a water / cement ratio of not more than 0.5 are mixed. A method according to claim 3, characterized in that color pigments are added and mixed. Process for producing a concrete layer ( 4 ), characterized in that a self - compacting concrete with a content of at least 340 kg blast furnace cement per m ^{3 of} concrete, wherein the blast furnace cement has a proportion of 20% to 34% Portland cement clinker and a proportion of 66% to 80% blastfurnace slag, with a share of at least 300 kg limestone dust per m ³ of concrete, with a proportion of at least 1,400 kg of rock grains of sand, gravel or crushed material per m ³ of concrete, the aggregate having a maximum particle size of at most 8 mm, with a styrene-acrylate copolymer in a proportion of 5% to 15% of the mass of the blastfurnace cement, with a high-performance flow agent based on polycarboxylate ethers with a maximum proportion of 2% of the mass of the blastfurnace cement and with a water / cement ratio of not more than 0.5 on a surface to be coated ( 1 ) of a component ( 2 ) is applied. A method according to claim 5, characterized in that the self-compacting concrete has color pigments. A method according to claim 5 or 6, characterized in that at a predetermined distance from the surface to be coated ( 1 ) of the component ( 2 ) a formwork ( 3 ) and the self-compacting concrete by filling in a cavity between the formwork ( 3 ) and the surface to be coated ( 1 ) of the component ( 2 ) on the surface to be coated ( 1 ) of the component ( 2 ) is applied. Method according to claim 7, characterized in that the formwork ( 3 ) at a predetermined distance of at least 2.5 cm to the surface to be coated ( 1 ) of the component ( 2 ) is arranged. Method according to claim 7 or 8, characterized in that the formwork ( 3 ) a structured surface ( 5 ) having. Method according to one of claims 5 to 9, characterized in that the surface to be coated ( 1 ) of the component ( 2 ) is oriented substantially vertically.

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