DD267722A1 - CONTROLLING THE REMOVAL PROCESS OF A HALF-DRY GIPS-SUPPLEMENT MIXTURE - Google Patents
CONTROLLING THE REMOVAL PROCESS OF A HALF-DRY GIPS-SUPPLEMENT MIXTURE Download PDFInfo
- Publication number
- DD267722A1 DD267722A1 DD31003987A DD31003987A DD267722A1 DD 267722 A1 DD267722 A1 DD 267722A1 DD 31003987 A DD31003987 A DD 31003987A DD 31003987 A DD31003987 A DD 31003987A DD 267722 A1 DD267722 A1 DD 267722A1
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- DD
- German Democratic Republic
- Prior art keywords
- gypsum
- water
- mixture
- particles
- setting process
- Prior art date
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Steuerung des Abbindeprozesses einer halbtrockenen Gips-Zuschlagstoff-Mischung. Die Erfindung betrifft die Steuerung des Abbindeprozesses einer Gipsmischung waehrend der Verarbeitung zu gipsgebundenen Werkstoffen, insbesondere zu Gipsbauteilen. Es soll eine zeitliche Steuerung des Abbindeprozesses einer Gipsmischung in einem halbtrockenen System mit wasserspeichernden Teilchen als Zuschlagstoff ermoeglicht werden, wodurch der Zeitpunkt der Hydratation des Gipshalbhydrates gezielt in Gang gesetzt werden kann. Erfindungsgemaess werden die wasserspeichernden Teilchen mit pulverfoermigen inerten, latent hydraulischen, puzzolanischen und hydraulischen Materialien einzeln oder im Gemisch bepudert und durch inniges Vermischen ummantelt.Control of the setting process of a semi-dry gypsum aggregate mixture. The invention relates to the control of the setting process of a gypsum mixture during processing into gypsum-bound materials, in particular gypsum components. It should be possible to control the timing of the setting process of a gypsum mixture in a semi-dry system with water-storing particles as an additive, whereby the time of hydration of the gypsum hemihydrate can be specifically set in motion. According to the invention, the water-storing particles are powdered with pulverulent inert, latently hydraulic, pozzolanic and hydraulic materials individually or as a mixture and encased by intimate mixing.
Description
Ausführungsbeispieleembodiments
Die Erfindung soll an 2 Beispielen näher beschrieben werden:The invention will be described in more detail in two examples:
I.Beispiel:I.Beispiel:
Eine kleinformatige Platte 355 χ 355 χ 15mm wird durch folgende Rezeptur sowie Verfahrensschritte hergestellt:A small format plate 355 χ 355 χ 15mm is produced by the following recipe and process steps:
560g Holzspäne <0,2mm werden in einem Trogmischer mit 560g Wasser angefeuchtet. Nach einer Sumpfzeit von 20s erfolgt durch das Zumischen von 190g Zement PZ 4/45 und 17g Dihydrat das Ummanteln der feuchten Späne.560g wood chips <0,2mm are moistened with 560g water in a trough mixer. After a sumping time of 20s, the mixing of the moist chips takes place by admixing 190 g cement PZ 4/45 and 17 g dihydrate.
Nachwfiteren 10s Abtrockenzeit werden 1120g des Bindemittels Gips zugemisr.ht.Nachwfiteren 10s drying time 1120g of the binder gypsum zugemisr.ht.
Die Mischung wird jetzt als Ausdruck für die technologischen Stufen zwischen Mischen und Verpressen 30min stehengelassen.The mixture is now left to stand for the technological stages between mixing and pressing for 30 minutes.
Das Verpressen erfolgt bei 12N/mm2. Durch den Dihydratanteil kann der Gips nach dem Auspressen des zur Hydratisierung erforderlichen Wassers beschleunigt abbinden. Nach dem Entschalen und Trocknen bis zur Ausgleichsfeuchte hat die gepreßte Holz-Gips-Platte bei einer Rohdichte von 1,2 kg/dm3 eine Biegefestigkeit von 8 N/mm2 sowie eine Druckfestigkeit vonThe pressing takes place at 12N / mm 2 . Due to the proportion of dihydrate, the gypsum can set faster after the water required for hydration has been pressed out. After demoulding and drying to equilibrium moisture content, the pressed wood-gypsum board has a flexural strength of 1.2 kg / dm 3, a flexural strength of 8 N / mm 2 and a compressive strength of
Die genannten Festigkeitskennwerte konnten bei gleichen Masseanteilen jedoch ohne Einsatz von Pudermittel nur erreicht werden, indei η spätestens nach 15 min Haltezeit der Preßvorgang eingeleitet wurde.However, the strength values mentioned could only be achieved with the same mass fractions without the use of powdering agents, since the pressing process was initiated at the latest after 15 minutes holding time.
2. Beispiel:2nd example:
Eine mehrschichtige Platte, bestehend aus unterer und oberer Deckschicht zu jeweils 25Ma.-% der Platte und Spänen 2mm sowie einer Mittelschicht mit 5Ma.-% der Platte und Spänen 2-4 mm wird analog der Rezeptur und dem Verfahren im Beispiel 1 unter Einsatz einer ostelbischen Asche als Pudermittel hergestellt. Die Platte weist eine Biegefestigkeit von 10N/mm2 und eine Druckfestigkeit von 40 N/mm2 auf.A multilayer board, consisting of lower and upper cover layers of 25% by weight of the board and chips 2 mm and a middle layer with 5% by mass of the board and chips 2-4 mm, is prepared analogously to the recipe and the method in Example 1 using a East Elbe ash produced as a powder. The plate has a flexural strength of 10N / mm 2 and a compressive strength of 40 N / mm 2 .
Auch hier betrug die Haltezeit bis zum Preßvorgang 30min.Again, the holding time was until the pressing 30min.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD31003987A DD267722A1 (en) | 1987-12-07 | 1987-12-07 | CONTROLLING THE REMOVAL PROCESS OF A HALF-DRY GIPS-SUPPLEMENT MIXTURE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD31003987A DD267722A1 (en) | 1987-12-07 | 1987-12-07 | CONTROLLING THE REMOVAL PROCESS OF A HALF-DRY GIPS-SUPPLEMENT MIXTURE |
Publications (1)
Publication Number | Publication Date |
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DD267722A1 true DD267722A1 (en) | 1989-05-10 |
Family
ID=5594754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DD31003987A DD267722A1 (en) | 1987-12-07 | 1987-12-07 | CONTROLLING THE REMOVAL PROCESS OF A HALF-DRY GIPS-SUPPLEMENT MIXTURE |
Country Status (1)
Country | Link |
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DD (1) | DD267722A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2177489A1 (en) * | 2008-09-29 | 2010-04-21 | Inge Höhn | Construction material with filler of vegetable origin |
-
1987
- 1987-12-07 DD DD31003987A patent/DD267722A1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2177489A1 (en) * | 2008-09-29 | 2010-04-21 | Inge Höhn | Construction material with filler of vegetable origin |
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