AT244830B - Method of treating mixtures of pozzolans - Google Patents
Method of treating mixtures of pozzolansInfo
- Publication number
- AT244830B AT244830B AT169963A AT169963A AT244830B AT 244830 B AT244830 B AT 244830B AT 169963 A AT169963 A AT 169963A AT 169963 A AT169963 A AT 169963A AT 244830 B AT244830 B AT 244830B
- Authority
- AT
- Austria
- Prior art keywords
- pozzolans
- mass
- slag
- treating mixtures
- mixture
- Prior art date
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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B20/02—Treatment
- C04B20/04—Heat treatment
-
- 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
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
-
- 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
- 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
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust 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
- 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
- C04B28/08—Slag 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Description
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Verfahren zur Behandlung von Mischungen aus Puzzolanen
Es ist bekannt, natürliche und künstliche Puzzolane, z. B. Trass, Santurinerde oder Flugasche,
Schlacken usw. mit einem Anreger, z. B. Zement, Kalk oder Gips zu mischen, wodurch eine Bildung von Hydraten aus Kalziumsilikaten, Kalziumaluminaten und Kalziumsulfoaluminaten eintritt, die in ihren physikalischen Eigenschaften dem Zementstein ähnlich sind. Daher wurden bisher natürliche und künstliche Puzzolane als Zusatz zu Zement für die Erzielung besonderer Betoneigenschaften, z. B. Was- serdichte, geringere Abbindewärme usw., verwendet.
Im besonderen Fall der Verwendung von Aschen, wie Flugasche und Elektrofilterasche, sowie Schlak- ken tritt jedoch bei der Hydratisierung eine starke Volumsvermehrung und nachfolgendes Schwinden ein, was bei der Verwendung als Bindemittel zu Sprengwirkungen bzw. schädlichen Schwinderscheinungen im
Erzeugnis führt. Zufolge der Änderung des Volumens war es auch bisher nicht möglich, in befriedigender
Weise Formsteine aus Aschen u. dgl. herzustellen. Es wurde zwar schon vorgeschlagen, Leichtbauplatten aus einer Si-Stoff, Kalk bzw. kalkhaltige Stoffe und/oder Zement sowie gegebenenfalls Faserstoffe, Sä- gemehl od. dgl. und unter Umständen kleine Mengen körniger Stoffe enthaltenden Masse herzustellen, wobei die Mörtelmasse schwach gerösteten Si-Stoff in solcher Menge, z.
B. 30 - 5rP/o oder mehr der Gesamtmasse und entsprechende Mengen Wasser enthält, dass eine plastische Masse entsteht, die auf der Strangpresse zu Steinen, Blöcken od. dgl. verformt wird. Dieses Verfahren, bei dem die Masse nach dem Anmachen mit Wasser ausserdem kurzzeitig gelagert wird, vermag möglicherweise für die angegebene Zusammensetzung befriedigende Ergebnisse zu liefern, bei andern Puzzolanen, insbesondere Aschen und Schlacken, ist jedoch durch die Lagerung allein nur eine teilweise Herabsetzung der Treib- und Schwil1d- erscheinungen möglich.
Die Erfindung bezweckt nun, die Treib- und Schwinderscheinungen von Puzzolanen, insbesondere Aschen und Schlacken, in weit wirkungsvollerer Weise zu beseitigen, als dies bisher möglich war, und erreicht dies in überraschend einfacher Weise dadurch, dass die Mischung während ihrer Lagerzeit erwärmt wird. Dabei kann die bei exotherm verlaufenden Prozessen entstehende Wärme ausgenutzt werden, indem die Masse während ihrer Lagerung gegen Wärmeabgabe abgeschirmt wird. Bei durchgeführten Versuchen hat sich eine Temperaturerhöhung der Mischung von mindestens etwa 5 C und eine Lagerzeit von mindestens etwa 10 min als günstig erwiesen.
Durch die Hintansetzung der Treib- und Schwinderscheinungen ist es möglich geworden, die so gewonnene Masse zur Herstellung von Formlingen im Strangpressverfahren zu verwenden, wobei es sich gezeigt hat, dass zur Erhöhung der Festigkeit und der Gleiteigenschaften die Zugabe von Asbest und/oder Steinmehl zweckmässig ist. Auch eine Verwendung der Masse als Bindemittel für Zuschlagstoffe, z. B.
Schlacke, Kies u. dgl., ist möglich.
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Method of treating mixtures of pozzolans
It is known to use natural and artificial pozzolans, e.g. B. trass, santurine soil or fly ash,
Slag, etc. with a stimulator, e.g. B. to mix cement, lime or gypsum, whereby a formation of hydrates from calcium silicates, calcium aluminates and calcium sulfoaluminates occurs, which are similar in their physical properties to cement stone. Therefore, natural and artificial pozzolans have been used as an additive to cement to achieve special concrete properties, e.g. B. water density, lower setting heat, etc. used.
In the special case of using ashes, such as fly ash and electrostatic precipitator ash, as well as slag, however, a strong increase in volume and subsequent shrinkage occur during hydration, which when used as a binder leads to explosive effects or harmful shrinkage phenomena
Product leads. As a result of the change in volume, it has not been possible to date in a more satisfactory manner
Way shaped stones from ashes u. Like. To produce. It has already been proposed to manufacture lightweight panels from a mass containing Si material, lime or lime-containing substances and / or cement and possibly fibrous material, sawdust or the like and possibly small amounts of granular substances, the mortar mass being slightly roasted Si - Substance in such an amount, e.g.
B. 30-5rP / o or more of the total mass and corresponding amounts of water, that a plastic mass is created, which od on the extruder to stones, blocks. This method, in which the mass is also stored for a short time after being mixed with water, may possibly give satisfactory results for the specified composition, with other pozzolans, in particular ashes and slag, however, storage alone only partially reduces the driving force. and swellings possible.
The invention now aims to eliminate the floating and shrinkage phenomena of pozzolans, in particular ashes and slag, in a far more effective manner than was previously possible, and achieves this in a surprisingly simple manner in that the mixture is heated during its storage time. The heat generated during exothermic processes can be used by shielding the mass from heat emission during storage. In tests carried out, an increase in temperature of the mixture of at least about 5 ° C. and a storage time of at least about 10 minutes have proven to be beneficial.
By placing behind the blowing and shrinkage phenomena, it has become possible to use the mass obtained in this way for the production of moldings in the extrusion process, whereby it has been shown that the addition of asbestos and / or stone dust is useful to increase the strength and the sliding properties . Use of the mass as a binder for aggregates, e.g. B.
Slag, gravel, etc. Like., is possible.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT169963A AT244830B (en) | 1963-03-04 | 1963-03-04 | Method of treating mixtures of pozzolans |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT169963A AT244830B (en) | 1963-03-04 | 1963-03-04 | Method of treating mixtures of pozzolans |
Publications (1)
Publication Number | Publication Date |
---|---|
AT244830B true AT244830B (en) | 1966-01-25 |
Family
ID=3519068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT169963A AT244830B (en) | 1963-03-04 | 1963-03-04 | Method of treating mixtures of pozzolans |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT244830B (en) |
-
1963
- 1963-03-04 AT AT169963A patent/AT244830B/en active
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