EP2625013A1 - Method for attenuating dark discolorations on facing concrete surfaces, ready-mix which cures to concrete, and cement for producing concrete - Google Patents
Method for attenuating dark discolorations on facing concrete surfaces, ready-mix which cures to concrete, and cement for producing concreteInfo
- Publication number
- EP2625013A1 EP2625013A1 EP11764107.6A EP11764107A EP2625013A1 EP 2625013 A1 EP2625013 A1 EP 2625013A1 EP 11764107 A EP11764107 A EP 11764107A EP 2625013 A1 EP2625013 A1 EP 2625013A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- concrete
- cement
- discoloration
- reducing agent
- exposed concrete
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/384—Treating agents
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/147—Alkali-metal sulfates; Ammonium sulfate
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/4578—Coating or impregnating of green ceramics or unset concrete
- C04B41/458—Coating or impregnating of green ceramics or unset concrete involving a mixing step with the top layer of the substrate
-
- 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
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2076—Discolouring resistant materials
Definitions
- the invention relates to a method for reducing the occurrence of spotty dark discoloration on exposed concrete surfaces.
- the invention further relates to a mixture that cures to concrete, and cement for the production of concrete.
- concrete is understood to mean concrete whose surface (exposed concrete surface) remains visible after removal of a formwork.
- Exposed concrete surfaces determine the architectural effect of a building and can be varied by the use of special formwork, a specific concrete composition or by subsequent mechanical processing.
- formwork smooth or structured formwork are used, which have absorbent or non-absorbent properties.
- shuttering materials for example, steel, plastic and untreated, impregnated or resin-coated wood materials can be used.
- the concrete In order to obtain void-free, uniform in their color effect concrete surfaces without runners, segregation phenomena or other visual defects, the concrete must be in accordance with the leaflet exposed concrete, version August 2004, self-publisher Deutscher Beton- und Bautechnik- V e. V. and Federation of the German Cement Industry e. V. be so composed that the consistency and the largest grain are adapted to the installation method and the component geometry. In practice, the following measures have proven successful:
- BV Concrete admixtures
- FM superplasticizers
- LP air-entraining agents
- DM sealants
- VZ retarders
- BE accelerators
- ST stabilizer
- RH cleaning water
- RH recycling aids for residual concrete
- RB chromate reducers
- SB foaming agents
- SR sedimentation reducers
- release agents can be applied which reduce the bond between the hardening concrete and the formwork surface in order to prevent breaks on the concrete surface when the formwork is removed.
- the mode of action of the release agent can be chemical and / or physical.
- the attached single figure illustrates the problem by means of 6 views, wherein each a perfect, uncolored light area (left column of the views) is compared with a dark discolored area.
- the top line compares photographic views of the surface.
- the middle line compares scanning electron micrographs of the surfaces and the bottom line compares SEM images of the microstructure (section through the exposed concrete surface).
- the phenomenon of spotty dark discoloration is an accumulation of localized, dark discoloration of the order of a few mm 2 over large areas on an originally uniformly bright exposed concrete surface.
- the dark discolored areas are characterized by a densification of the near-surface microstructure, in which the porosity of the cement paste matrix is significantly lower.
- the scanning electron micrographs also show that the surface of the dark discolored areas has a more planar structure compared to the uncolored areas, with the pores appearing dark in the scanning electron micrographs.
- the invention is based on the object to provide an easy to implement and cost-effective way, with the occurrence of spotty Bisverfarbitch on exposed concrete surfaces can be reliably reduced or completely prevented.
- a first solution to this problem is achieved by a method according to claim 1.
- the anions of the discoloration-reducing agent advantageously contain hydroxyl, sulfate or carbonate ions.
- the discoloration-reducing agent advantageously contains Na 2 S0 4 and / or K 2 S0 4 .
- the claim 4 is directed to advantageous alkali contents of the mixing water, provided that the discoloration reducing agent is added to the mixing water.
- the claim 5 indicates advantageous alkali contents when the discoloration reducing agent is applied directly to a surface of a formwork.
- the concrete and / or the cement advantageously a congealing regulator is added.
- the claim 8 is directed to a ready mix, with which the problem underlying the invention is solved.
- Claims 9 and 10 characterize advantageously used stain reducing agents.
- Claim 11 is directed to advantageous compositions of the ready mix.
- lightly soluble alkalis may be admixed with a cement suitable for producing exposed concrete during firing or during the milling process or in a separate step, so that exposed concrete produced using this cement shows no or at least less spotty dark discoloration.
- a finished mixture prepared using a cement having a Na 2 O equivalent of at least 0.7% by mass advantageously contains some aggregates and optionally additives and / or additives.
- the occurrence of spotty dark colors can be counteracted by two measures that can be used alone or in combination:
- the flowable exposed concrete is at least in the area which forms the exposed concrete surface after curing, added a discoloration reducing agent.
- a discoloration reducing agent This can be done by admixing the stain reducing agent to the flowable concrete mixture as a whole or only to the surface area forming the later visible surface.
- the effect of the discoloring agent may be due to the reduction of the calcium content of the pore solution, without adversely affecting the hydration reaction as well as the processability and durability properties.
- the flowable concrete mixture can be any concrete mixture used for exposed concrete, where the aggregate can be, for example, sand, gravel or grit of suitable grain size, conventional cement is used and the concrete admixtures described above can be present.
- the aggregate can be, for example, sand, gravel or grit of suitable grain size, conventional cement is used and the concrete admixtures described above can be present.
- the discoloration-reducing agent contains as active ingredients cations of the alkali metals in conjunction with inorganic and organic anions, or hydroxyl, sulfate, or carbonations.
- the stain reducing agent may contain, for example, Na 2 S0 4 and / or K 2 SO 4 .
- a cement in addition and / or in addition to, the exposed concrete mixed before or after the addition of water discoloration reducing agent, a cement can be used, which counteracts due to its Alkalisulfatgehaltes the formation of dark discoloration.
- An alkali sulphate content of the cement is determined by the natural alkali content of the raw materials, such as limestone, clay, sand.
- the alkali sulphate content required to avoid dark colorations can be achieved by an additional process step during cement production.
- the cement powder easily soluble alkalis and optionally solidification regulators or additives for adjusting the processing added. This can be done during the firing process, during the milling process or as a separate process step.
- the cement advantageously has a Na 2 O equivalent of at least 0.7% by mass, the Na 2 O equivalent being defined by:
- the cement of the invention having the predetermined alkali sulfate content causes a reduced solubility of the calcium in the cement-water suspension due to the increased alkali content, resulting in a decreased calcium content in the pore solution.
- the invention has many uses, for example for in-situ concrete, ready-mixed concrete, precast concrete, concrete products, etc.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010047923.3A DE102010047923B4 (en) | 2010-10-08 | 2010-10-08 | Use of an agent to reduce dark discoloration on exposed concrete surfaces |
PCT/EP2011/004778 WO2012045401A1 (en) | 2010-10-08 | 2011-09-23 | Method for attenuating dark discolorations on facing concrete surfaces, ready-mix which cures to concrete, and cement for producing concrete |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2625013A1 true EP2625013A1 (en) | 2013-08-14 |
Family
ID=44735876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11764107.6A Withdrawn EP2625013A1 (en) | 2010-10-08 | 2011-09-23 | Method for attenuating dark discolorations on facing concrete surfaces, ready-mix which cures to concrete, and cement for producing concrete |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2625013A1 (en) |
DE (1) | DE102010047923B4 (en) |
WO (1) | WO2012045401A1 (en) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2400458B2 (en) * | 1974-01-05 | 1976-10-28 | Th. Goldschmidt Ag, 4300 Essen | CONCRETE RELEASE AGENT |
IE50009B1 (en) * | 1979-08-01 | 1986-01-22 | Blue Circle Ind Ltd | Portland cement clinker |
JPS6021838A (en) * | 1983-07-15 | 1985-02-04 | 阿部 政博 | Water-dispersible admixing agent for cement and manufacture |
DE3930458A1 (en) * | 1989-09-12 | 1991-03-21 | Durmersheim Baustoffwerke | WERKTROCKENMOERTEL |
DE19514266A1 (en) * | 1995-04-15 | 1996-10-17 | Basf Ag | Process for the preservation of a mineral shaped body |
DE10012563A1 (en) * | 2000-03-15 | 2001-09-20 | Hubert Heider | Mineral building material used e.g. as a wall dehumidification plaster contains a mixture of an alkyl naphthalene sulfonate, an alkyl benzene sulfonate and an alkali sulfate as an additive |
DE20023232U1 (en) * | 2000-03-15 | 2003-06-05 | Heider Hubert | Mineral building material used e.g. as a wall dehumidification plaster contains a mixture of an alkyl naphthalene sulfonate, an alkyl benzene sulfonate and an alkali sulfate as an additive |
DE10064311A1 (en) * | 2000-12-22 | 2002-06-27 | Skw Polymers Gmbh | Suppressing efflorescence on cement-based building materials modified with melamine resins comprises adding an alkylated benzene or naphthalene sulfonate |
FR2841239B1 (en) * | 2002-06-20 | 2005-03-25 | Aime Lozano | NEW MATERIAL FOR BUILDING |
EP1547987A3 (en) * | 2003-12-23 | 2006-03-15 | HeidelbergCement AG | Cement for making concrete article having reduced capillary water absorption and method for its production |
DE102005050026A1 (en) * | 2005-10-19 | 2007-04-26 | Krefelder Zement Gmbh | White cement for use in mortars and concrete, comprises blast furnace slag in form of granulated cinder as hydraulic effective carrier material with activators |
US20080202388A1 (en) * | 2007-02-27 | 2008-08-28 | Kerneos | Stain free hydraulic binder, mortar and concrete |
-
2010
- 2010-10-08 DE DE102010047923.3A patent/DE102010047923B4/en active Active
-
2011
- 2011-09-23 WO PCT/EP2011/004778 patent/WO2012045401A1/en active Application Filing
- 2011-09-23 EP EP11764107.6A patent/EP2625013A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2012045401A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010047923A1 (en) | 2012-04-12 |
DE102010047923B4 (en) | 2014-09-11 |
WO2012045401A1 (en) | 2012-04-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2679560B1 (en) | Two-component floor spatula | |
DE3514698C2 (en) | Process for the production of aerated concrete | |
DE2314352A1 (en) | REINFORCED MIX | |
CH658854A5 (en) | ADDITIVES FOR CEMENT, CONCRETE OR MORTAR, METHOD FOR THE PRODUCTION THEREOF AND THE USE THEREOF. | |
EP3126308A1 (en) | Quick-drying building material composition based on a mineral hybrid binder | |
EP1686109B1 (en) | Coating for cement-bonded substrates | |
DE2727026A1 (en) | PROCESS FOR ACCELERATING THE CURING AND INCREASING THE STRENGTH OF CEMENTS | |
DE19848248C2 (en) | Thin-walled component made of hydraulically hardened cement stone material and process for its production | |
DE2739188B1 (en) | Aerated concrete component and process for producing aerated concrete | |
DE1943634B2 (en) | Process for the production of a horizontal floor covering from a mass based on an anhydrite binder | |
DE102010047923B4 (en) | Use of an agent to reduce dark discoloration on exposed concrete surfaces | |
DE3236333A1 (en) | METHOD FOR PRODUCING MIXED COMPOSITIONS | |
DE2820389A1 (en) | Prepn. of polyvinyl alcohol dispersion - contg. oil and calcium chloride, as additive for cement | |
WO2022079148A1 (en) | Building material additive for calcium sulphate-based building materials | |
WO2005007594A1 (en) | Concrete thickener for thickening concrete articles, concrete articles and method for the production thereof | |
DE3322067A1 (en) | Building element, especially a fire-retarding building panel | |
DE1966658C3 (en) | Compound for screeds and methods of processing the compound | |
EP0269736A1 (en) | Composition for making plaster articles | |
DE102015218759B3 (en) | Gypsum-cement dry mix and building finished parts made therefrom | |
DE1126792B (en) | Dry mortar mix | |
DE10107822B4 (en) | Self-leveling screed mixture and process for the production of self-leveling screed | |
WO2007051569A1 (en) | Method of improving the adhesion of cement-bound coatings to concrete surfaces | |
DE3115938C2 (en) | Process for the preparation of a mortar containing a lean agent and synthetic anhydrite | |
DE102006019056A1 (en) | Use of a mortar mixture as attachment mortar | |
AT504328B1 (en) | USE OF AN ADDITIVE TO A BUILDING MATERIAL AND METHOD FOR PRODUCING A BUILDING MATERIAL |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20130430 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHIESSL, PETER Inventor name: LOWKE, DIRK Inventor name: STREHLEIN, DORIS |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20140805 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20160413 |