DE648851C - Process for reducing the setting time of high alumina cements - Google Patents
Process for reducing the setting time of high alumina cementsInfo
- Publication number
- DE648851C DE648851C DES110454D DES0110454D DE648851C DE 648851 C DE648851 C DE 648851C DE S110454 D DES110454 D DE S110454D DE S0110454 D DES0110454 D DE S0110454D DE 648851 C DE648851 C DE 648851C
- Authority
- DE
- Germany
- Prior art keywords
- setting time
- high alumina
- reducing
- alumina cements
- cement
- 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.)
- Expired
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
- 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
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0004—Compounds chosen for the nature of their cations
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
Verfahren zur Verkürzung der Abbindezeit von Tonerdezementen Die Erfindung betrifft ein Verfahren zur Verkürzung der Abbindezeit von Tonerde-Zementen o. dgl. ohne Beeinträchtigung der Festigkeiten und ohne Erhöhung der Schwindung. Sie besteht im besonderen darin, daß dem Tonerdezement geringe Mengen von Lithiumsalzen, bis zu etwa 0,20/0, zugegeben werden, die dem Zement zugemahlen oder dem Anmachwasser zugesetzt werden können.Method for shortening the setting time of high alumina cements The invention relates to a method for shortening the setting time of alumina cements o. without impairing the strength and without increasing the shrinkage. she consists in particular that the calcium aluminate cement contains small amounts of lithium salts, up to to about 0.20 / 0, which is ground to the cement or the mixing water can be added.
Es ist bekannt, die Abbindezeit von Zementen durch Zusätze, beispielsweise gelöschten Kalk, Natriumchlorid, Calciumchlorid, Aluminiumchlorid usw.,' zu regeln, insbesondere zu verkürzen. Zusätze dieser Art müssen aber beträyhtlich, teilweise über 5 0jo, sein, um überhaupt wirken zu können. Eine geringere Konzentration würde unwirksam sein. Weiterhin wird durch einen Zusatz von bereits i % von beispielsweise Ca(OH)2 und Aluminiumehloüd die Normenfestigkeit stark verringert, während mit Calciumchlorid oder NatriumchloTid die Schwindung des angemachten Zem-ntes so groß wird, daß dem aus dem Zement hergestellten Beton schwere tech- i niscle Mängel anhaften. Ferner ist auch schon vorgeschlagen worden, Bindemittelgemschen aus hydraulischen und latenthydraulisch:n Stoffe. alkalisch reagierende Lithiumverb_idungen, insbesondere Lithiumhydroxyd, zuzusetzen. Bei dem bekannten Verfahren wird indes im Gegensatz zum ErfindungsgegEnstand eine größere Menge von etwa 2 % Lithiumhydroxyd zugesetzt. Auch erfolgt _ bei dem bekannten Verfahren dex Litlnumzusatz nicht zur Regelung der Abbindezeit von Zementen, sondern zur Verbesserung der Hydraulizität von Bindemittelgemischen aus hydraulischen und latenthydraulischen Stoffen, wodurch im besonderen die Festigkeit bei der Luftlagerung erhöht werden soll.It is known, the setting time of cements by additives, for example slaked lime, sodium chloride, calcium chloride, aluminum chloride, etc., to regulate, especially to shorten. Additions of this kind must be considerable, in part over 5 0jo, to be able to work at all. A lower concentration would be ineffective. Furthermore, an addition of already i% of, for example Ca (OH) 2 and Aluminiumehloüd greatly reduced the standard strength, while with calcium chloride or sodium chloride the shrinkage of the cemented on is so great that the Concrete made from the cement adhere to severe technical defects. Further it has also already been proposed to mix hydraulic and latent hydraulic binders: n Fabrics. alkaline reacting lithium compounds, especially lithium hydroxide, to add. In the known method, however, in contrast to the subject of the invention a larger amount of about 2% lithium hydroxide was added. Also takes place in the known processes of the addition of lithium not to regulate the setting time of cements, but to improve the hydraulic properties of hydraulic binder mixtures and latent hydraulic substances, which in particular increase the strength in air storage should be increased.
Die Verkürzung der Abbindezeit nach dem vorliegenden Verfahren läßt sich durch einfache Veränderung der prozentual zugesetzten Menge beliebig regeln. Nimmt man beispielsweise eine n/ i o-Lithiumchloridlösung als Anmachwasser, so beträgt die Abbindezeit ungefähr io Minuten und mit einer n/ioo-Lithiumchloridlösung i Stunde, während mit einer n `i ooo-Lösung keine Wirkung mehr vorhanden ist. Wenn man den Zement mit einer n! i o-Lithiumchloridlösung anmacht, dann beträgt der Prozentsatz Lithiumchlorid, auf den Zement berechnet, o, i o;ö. Diese Menge ist nun so gering, daß die Normenfestigkeiten nicht verschlechtert werden und die Schwindung nicht erhöht wird. - Dagegen werden aber die Anfangsfestigkeiten stark erhöht. Ein normal abbindender Zement hat z. B. nach 2 Stunden noch keine Festigkeit, während ein erfindungsgemäß miteiner etwa n/5o-Lithiumsalzlösung angemachter Zement eine Festigkeit von rund iookg/cm2 aufweist.The shortening of the setting time according to the present method can can be regulated as required by simply changing the percentage added. If, for example, a n / i o lithium chloride solution is used as the mixing water, then is the setting time is about 10 minutes and with a 1,000 lithium chloride solution 1 hour, while with a n'100 solution there is no longer any effect. If you have the Cement with an n! i o lithium chloride solution turns on, then the percentage is Lithium chloride, calculated on the cement, o, i o; ö. This amount is so small now that the norm strengths are not worsened and the shrinkage is not is increased. - On the other hand, the initial strengths are greatly increased. A normal setting cement has z. B. after 2 hours still no strength, while according to the invention cement made up with an approx iookg / cm2.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES110454D DE648851C (en) | 1933-08-03 | 1933-08-03 | Process for reducing the setting time of high alumina cements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES110454D DE648851C (en) | 1933-08-03 | 1933-08-03 | Process for reducing the setting time of high alumina cements |
Publications (1)
Publication Number | Publication Date |
---|---|
DE648851C true DE648851C (en) | 1937-08-10 |
Family
ID=7530249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES110454D Expired DE648851C (en) | 1933-08-03 | 1933-08-03 | Process for reducing the setting time of high alumina cements |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE648851C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1236702B2 (en) † | 2001-03-02 | 2011-08-10 | maxit Deutschland GmbH | Building material mixture containing waterglass |
-
1933
- 1933-08-03 DE DES110454D patent/DE648851C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1236702B2 (en) † | 2001-03-02 | 2011-08-10 | maxit Deutschland GmbH | Building material mixture containing waterglass |
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