DD269295A3 - Method of producing heavy-duty, decorative screed floors and gypsum-based boards - Google Patents

Abstract

The invention relates to a process for the production of heavy-duty, decorative screed floors and gypsum-based boards, which can be used both in housing and company construction as well as in the restoration of historic buildings. The aim and object of the invention is to develop a manufacturing process for heavy-duty, decorative Estrichfussboeden and plates while reducing the specific binder use compared to known Massivfussboeden. According to the invention, the object is achieved by using gypsum binders in the quality of hard plaster as a binder, exclusively natural gypsum aggregate, basic anhydrite powder as setting regulator, as well as Verzoegerer and plasticizers for the production.

Description

M.313S 1

Title of the invention

Method of producing heavy-duty, decorative screed floors and gypsum-based boards

Field of application of the invention

The invention relates to a method for producing hochbeai.spruchbarer decorative screed floors and gypsum-based boards. The method according to the invention can be used both in society building and housing construction as well as in the restoration of listed buildings.

Characteristic of the known technical solutions

Massive floors are manufactured in construction in different technology (Guidelines for the material requirements in construction, - Verlag für Bauwesen Berlin, 1985, p. 118 ff).

Terrazzo, washed concrete, road construction clay, / ^ nhydrit-Fl.ießestrich and stone wood floors are mainly produced for the various purposes. Massive floors using cement as a binder as well as quartz and / or limestone of different modification as aggregates have found the widest possible range of application. Widely used has also flow anhydrite screed in industrial, residential and social construction experienced ("Baustoffindustrie", 30, 1987 pp 6 to 8).

From the patent literature and the technical literature technical solutions for the production of Anhydritestrich for different applications are known, the anhydrite fulfills the function of the binder and sand, gravel or mineral Brechprcdukte such as quartz, marble or the like as aggregates and alums and / or resins to increase serve the mechanical resistance (DE PS 122 8544, DE OS 19U 9681, DG WP 132 425, DD WP 200 464).

The aggregates are only added for leaning and do not form a crystalline bond with the binder from a mineralogical point of view. Gypsum binder finds, inter alia, for the production of decorative Formkörpei. and as a binder broad use in construction (Ulimann "Encyclopedia of Industrial Chemistry", Volume 12, 1976, p 304 ff, SU PS 1217 BiO). However, the mechanical strength of gypsum structures is generally limited and does not meet the technical requirements. This is especially true for heavy-duty floor, so that almost exclusively cement screed of different types is used as a wear layer for this reason.

Object of the invention

It is the object of the invention, a heavy-duty, decorative screed floor and gypsum-based boards with simultaneous reduction of the specific binder insert i ^. Compared to known solid flooring to meet the following technical requirements:

Bulk density> 1.9 g / cm ³

Bending tensile strength> 4.0 MPa

- Compressive strength> 20.0 MPa

- abrasion <25 cm ³ / 50cm ² .

Explanation of the essence of the invention

The invention has for its object to provide a method which allows the production of heavy-duty, decorative screed floors and gypsum-based boards, which are used raw, ground or otherwise surface-treated kf / πηεη. Furthermore, there is the task of laying the solid floor at the installation as a plaster screed and / or prefabricate industrially in the form of heavy-duty, decorative panels.

According to the invention, the object is achieved in that gypsum binder (20 to mass percent) in the quality llartformgips (oG gypsum binder) as a binder, excluding natural gypsum (52 to 66 mass percent) as an aggregate and basic anhydrite powder excited (4.0 bis 4.5% by mass) are used as Abbinderegulierer for producing ve ι hochbeanspruchbaren, decorative screed floors and plates.

In contrast to the previously known screeds, in which the additives are inert or bind only superficially, takes place in the inventive method, a chemical "lattice" between binder and aggregate, wherein the resulting product is a monophasic monomineral rock body. The result of the elapsed reaction can be detected physically-mineralogically. As aggregate natural gypsum stone of all geological horizons can be used. After processing (breaking, classifying), the aggregate is used in the optimum range - grain composition between the grading curves AO and BB or A16 and B16. The water-binder factor is adjusted between 0.35 and 0.40.

DiO processing time of the mortar is further regulated by the use of retarders such as sodium citrate, diammonium hydrogen phosphate and glues of organic origin in concentrations <1.0 mass percent. Since the raw materials are used with a low water-binder factor, plasticizers and / or condensers in the concentration range of up to 5% by mass are used for better verifiability. Strength regulation is given by substituting the hard plaster for up to 30 percent with other gypsum binders.

For reduced strength requirements, for example, model plaster 09 gypsum binder) and at higher strengths, for example, super hard plaster (synthetic plasters) are used.

The processing of the screed according to the invention to floors or plates and their treatment are carried out according to conventional craft and / or industrial technologies.

The specifics (swelling dimension, shrinkage dimension) of the screed according to the invention make it possible to produce both large-area, joint-free and 7-jointed (ornaments) floors.

An additional Farbgeuung is possible by adding lime-resistant pigments to the mortar mixture. In addition, for further Nutzwertert.öhung the screed or the plates, a sealing of the surface with wax and / or plastic-containing ¹ components, such as beeswax, carnauba wax, montan wax or Polysterharze done.

Embodiment 1

According to the invention, a mortar mixture of the following composition is prepared in a conventional manner for the production of a coating or board and used both for laying in new buildings and for the restoration of historic screed:

Hard cast gypsum 20.37 percent

natural gypsum.in 66.31 percent

Anhydrite Λ 9? 4.07 percent

Portland cement 0.20 percent

Viscous 0.32 percent

Natriuitrate 0.02 percent

Water 8.71 percent.

After AbbindeprozeO the surface of the produced material is ground. The material test gave the following parameters after 20 .mu.

1. Bending tensile strength at prisms 9.1 MPa

2. Compressive strength to prisms 36.4 MPa

3. Bulk density 2.11 kg / dm ³

4. abrasion 11.4 cm, 750 cm ²

Embodiment 2

For the purpose of color adjustment of the mortar mixture to a historic screed intended for restoration and, on the other hand, for color nuancing of slabs, a mortar of the following composition is prepared and processed analogously to Example 1

Hard mold plaster 29,62 percent

natural gypsum 52.11 percent

Anhydrite A 92 4.44 percent

Portland cement 0.22 percent

Iron oxide red 0.36 percent

Visko.Tiin 0.59 percent

Skin glue 0.59 percent

Alum 0.20 percent

Nalrium citrate 0.02 percent

Water 11.05 percent

ZCStSS

Technical parameters:

1. Bending tensile strength to prisms 5.7 MPa

2. Compressive strength to prisms 30.3 MPa

3. Raw density 2.08 kg / dm ³

4. Abrasion 11.1 cm ^J / 50 cm ²

Embodiment 3

It has been suggested that the higher grade 6-gypsum binder can be partially replaced by [ 0-gypsum binder. In application of this, a mortar mixture of the following composition is produced for the production of boards or screed:

Hard mold plaster 16.22 percent

Model plaster 4.15 percent

other components and further processing as in the example

technical parameters:

Bending tensile strength at prisms 6.8 MPa

Compressive strength on prisms 32.1 MPa Raw density 2.08 kg / dm ³

Abrasion 11.2 ^cm3 / 50 cm ²

Claims (6)

claims 1. A process for the production of heavy-duty, decorative screed floors and gypsum-based boards characterized in that gypsum in the quality of hard plaster (<? C plaster binder) is used as a binder at a water-binder factor of 0.35 to 0.40, as aggregate exclusively natural gypsum stone in the optimal 5-line range between the grading curves Λ 8 and ß 0 or A 16 and B 16 and basic anhydrite powder are used as setting regulator, the following composition is adhered plaster binder 20 to 30 mass percent - natural gypsum 52 to 66 mass percent - Anhydrite powder 4 to 4.5 mass percent. 2. The method according to claim 1, characterized in that the mortar further retarders such as sodium, Diammoniu ^ hydrogen phosphate and glues of organic origin and the like in concentrations <1% and to improve the processability plasticizers and / or 'liquefier in concentrations up to 5 M ^ sse- Percent can be added. 3. The method according to claim 1, characterized in that the binder Hartformgips manufacturer or user side by other gypsum binder (/ 3 plaster binder or synthetic gypsum binder) can be exchanged to a ratio of 30 percent. 4. The method according to claim i to 3, characterized in that the mortar mix directly at the place of use and / or prefabricated industrially prefabricated in plate form and the Goer surface is ground after the Abbindeprozeß. 5. The method according to claim 1 to 4, characterized in that additional coloring by admixing of lime-resistant pigments to the mortar mixture takes place. 6. The method according to claim 1 to 5, characterized in that for further increasing the utility value sealing of the surface with wax and / or plastic-containing components is given.