PORE SCREEN END CONCRETE ADDITIVE

The available invention concerns a new additive combination for pore screen end of building materials, in particular air void screen end of building materials, on concrete basis. With this new additive combination can auß ergewöhnlich homogeneous micropore-stresses or polystyrene-stresses to be manufactured.

The invention concerns further from these building materials rackable elements, like e.g. (basic) wall parts, polystyrene concrete walls, sound insulating units, basement walls, wall finished units, ceiling components, in addition, to examples the screed.

For the production of concrete with high Frostund rope central stability it is already for a long time admits air void screen end concrete additive to use. Mainly means are inserted on basis by Sulfitablauge, which result during the production of cellulose or such means become used on basis by Tensiden. In addition, further formaldehyde foam condensates (DD-WP 52393) become, Polyacrylamid (DE-OS 2149441) or by means of hydrocarbons hydrophobierte silicate layers (DE-OS 2923939) are described while stationary the technology. It is unfavorable that the air void screen end effect decreases with increasing storage duration. Thereby problems result in the case of the optimal dosage of these means at the machine for mixing.

DD-287 841 describes further an air void screen end a concrete additive, which 20 to 70 volume parts of the Glycerins won with the distillative processing by means of drop film evaporator under vacuum from natural fats of resulting Sumpfproduktes, 0.1 to 5 volume parts nichtionogener Tenside and 25 to 79.9 Volumentelle water contains, whereby the pH value of the mixture is to amount to 3.5 to 5.5. The nichtionogene Tensid is a Fettalkoholpolyglykolether with chain lengths from C12 to C18 and contains 5 to 10 groups of ethyl oxides.

Further it is well-known that cement-bound building materials like e.g. Concrete, high loads to take up and also high printing strengtheningnesses reach know. From concrete manufactured construction units exhibit a high dead weight and from there are partly very expensive the transport of construction units. Further cement-bound building materials point such as concrete a bad thermal insulation, a bad water vapor diffusion and a one badly to workability to (do not hit from iron nails into Betonwändeund covers is possible as well known).

It is from there task of the available invention to indicate a pore screen end a concrete additive and/or a wall material which consists of a homogeneous material, as well as diffusion is water vapour to take up can, and again to deliver can. Further a high air void portion and a high Wärmedämmfähigkeit in the finished element, which is to exhibit a good workability at the same time, are to be obtained. It is to be likewise considered that all relevant standards are kept.

This task becomes gemä&szlig by the pore screen end concrete additive, which contains surface-active means; Requirement 1 solved. That erfindungsgemäß e pore screen end additive contains an active substance combination of the following components:

1. (A) 10 to 50 Gew. - % at anionischen well salts of Alkylnaphthalinsulfonsäuren,
2. (b1) 20 to 75 Gew. - % at sodium salts of Alkylpheloläthersulfat and/or alkylbenzenesulfonate or
3. (b2) 20 to 75 Gew. - % at sodium salts from sulfated C12 to C15-Oxoalkoholpolyglykoläther,
4. (C) 10 to 40 Gew. - % at a styrene mixture polymer with an acid number from 5 to 15, like it for the production of wäß rigen art off dispersions is suitable,
5. (D) 10 to 35 Gew. - % of a formaldehyde Melamin well Hydrogensulfit copolymer.

If necessary further the components can:

1. (e) 7 to 15 Gew. - % of a glue-free highly concentrated paraffin dispersion (as hydrophobic treatment means), and/or
2. (f) 7 to 15 Gew. - % at sodium salts of a Naphthalinsulfonsäure FormaldehydKondensationsproduktes the concrete additive added its.

In a special execution form of the invention the component becomes (A), (B), (C), (D), if necessary (f), in each case used in feinpulvriger, dry form.

The component (C) preferably consists of a butadiene-free styrene mixture polymer with an acid number from 5 to 15. Particularly preferentially the component (C) of styrene/acrylic acid mixture polymer or styrene/acrylic acid ester/acrylic acid mixture polymer with an acid number from 8 to 12 consists.

In a special execution form of the invention the concrete additive covers the components (A) 30 to 40 Gew. - %, the components (b1) or (b2) 40 to 60 Gew. - %, the component (C) 10 to 20 Gew. - %, the component (D) 10 to 35 Gew. - % and if necessary the component (f) 7 to 15 Gew. - %.

Further that can erfindungsgemäß e concrete additive with further inert carriers diluted its.

The available invention concerns further a pore-forming building material on concrete basis, comprehensively a mixture of cement and concrete addition material and the concrete additive. On 100 kg of a mixture from cement and concrete addition, in particular sand, 40 to 1000 g come erfindungsgemäß EN of additive with the components (A) to (D) and (f) and/or (A) to (f) (see requirement 7) per 100 kg of the mixture from cement and addition material.

In the Unteransprüchen further favourable execution forms are contained of the invention.

The invention concerns however schließ lich also from the pore-forming building material producible elements, like e.g. basic wall parts, basement walls, wall finished units such as massif walls, double sound walls, sandwich slabs, Schallschutzwände and ceiling components, in addition, balance damming concrete (screed polystyrene concrete), filling damming concrete (double scarf walls fill), wall insulating units (polystyrene concrete walls).

That erfindungsgemäß e pore screen end concrete additive is a highly concentrated mixture from different additives (A) to (D), (f) and if necessary (e) and active substances in the firm, sillikatischen substrate.

That erfindungsgemäß e concrete additive produced in the fresh concrete a high concentration of sturdy pores and/or air voids. This takes place when mixing via a auto+catalytic Prozeß , with that no gases such as oxygen, hydrogen or carbon dioxide to be set free.

The reaction mechanism is practically temperature independent, so that it can be very well reproduced.

When confirming develop stress with a defined content of fine and finest cavities. This makes the production of construction units possible with high quality and particularly gleichmäß igen characteristics.

The effect erfindungsgemäß EN concrete additive goes beyond simple mixtures of Luftporenund foamers far. Their advantages are combined, the disadvantages are avoided and additional achievement parameters added. Altogether leaves itself erfindungsgemä&szlig as particularly favourable effect by that; e additive obtain that a particularly homogeneous mixture property develops and none the Entmi components, i.e. no Ausbluten is more given, as it is to be observed frequently with the state of the art.

That erfindungsgemäß e concrete additive is used for the production of Microporenbetonen. In addition come beside Portland cement (like e.g. CEM I 42.5 R, CEM I 52.5 R, CEM II 52.5 Al) different Zuschläge and addition mixtures to the employment.

As characteristic characteristic have in such a way manufactured stress air void contents of 20 VOL. - % to over 40 VOL. - %.

In the simplest case a Microporen concrete becomes erfindungsgemä&szlig made of cement, quartz sand, that; EN concrete additive and water mixed. In mixtures with high order quartz sand is totally or partly replaced by organic and/or inorganic lightweight aggregates (e.g. Polystyrene, blowing glass, blowing clay/tone, wood chips etc.).

The polystyrene used in the polystyrene concrete can be also flammhämmend equipped. For this all can the specialist admitted flame protection means like e.g. Pyrocheck 68 B ® are used.

Depending upon formulation can with that erfindungsgemäß EN concrete additive manufactured Microporen stressing these technical characteristics reach:

• very well pumpable and fließ able,
• shrink-poor hardening;
• No Ausbluten and no separating of the Zuschläge; to use thus reliably and surely; less Ausschuß.
• Depending upon formulation gross densities of 1,2-2,0 kg/dm3 with printing strengtheningnesses to 45 N/mm2 (LC35/38) and an air void content of 20-40 VOL. - %.
• Lower gross densities by mixtures from sand and/or lightweight aggregates (e.g. Polystyrene concrete 0.22-0.70 kg/dm3).
• With comparable technical characteristics to 25% fewer weight and up to 20% less raw material employment per m3 compared with normal stressing.
• Not inflammable.
• Environmentalneutrally like others stress.
• Groß it Porenvolumen of 30-80 VOL. - %.
• Compared with simple Luftporenbildnern high portion of Feinund purifying pores in the concrete matrix.
• Therefore low diffusion resistance opposite water vapour without noticeable salt flax migration.
• High thermal insulation/small heat conductivity.
• Improvement of the W/Z value, thus smaller water connection and shortening of the drying behavior.

Erfindungsgemäß result then in preferential execution forms the following applications:

1. 1. Lightweight concrete alone with sand addition manufactured, with a gross density of 1,22,0 kg/dm3 with a pressure strength of up to 45 N/mm2 with an air void content of 20 - 40 VOL. - %.
2. 2. Structure poet concrete with 25 VOL. - % air voids, a gross density of 1,15 kg/dm3 and a pressure strength of more than 15 N/mm2.
3. 3. Pump-cash and fließ capable concrete with polystyrene additive, gross density 0.25 - 0.70 kg/dm3, pressure strength 0.4 - 6.0 N/mm2.

The characteristics with that erfindungsgemäß EN additives of manufactured concrete are:

• special micropore structure,
• small dead weight of the construction units,
• small transporting weight of the construction units,
• good thermal insulation,
• good water vapor diffusion,
• small material decrease,
• good workability of the concrete, i.e. nail hitting e.g. possible.
• Improvement of the W/ZWertes (water/cement value)

In the sense of the invention by the term “alkyl” is preferably understood c1 to C6 alkyl (branches out or gradkettig), while the expression “ether” or “Polyglykol” preferably refers to Polyoxyäthylenäther.

A practical beginning of a preferential erfindungsgemäß EN execution form is as follows:

1. 21.62 Gew. - % sodium salt of Diisobuthylnaphtalinsulfonsäure [component (A)],
2. 29.73 Gew. - % sodium salt of sulfated C12 - C15 Oxoalkoholpolyglykoläther [component (b2)],
3. 8.1 Gew. - % feinpulvriges styrene acrylic acid copolymer and/or styrene acrylic ester acrylic acid copolymer with an acid number from 8 to 12 [component (C)],
4. 40.54 Gew. - % formaldehyde Melamin sodium Hydrogensulfit copolymer [component (D)].

50.3 g are used by this auxiliary preparation to 100 kg mixture sand and Portland cement.

With that erfindungsgemäß it concerns assigned component (D) a rieselfähiges powder that by spray drying of a sulfonierten Polykondesationsprodukts on basis by Melamin one manufactured. In particular it concerns a formaldehyde Melamin sodium Hydrogensulfit copolymer with the CAS-Nr.64787-97-9.

The invention is more near described now on the basis the following examples, without limiting it however to it.

It becomes erfindungsgemäß it Microporenbeton with the designation Hydrotherm® S manufactured using erfindungsgemäß EN of concrete additive with the components (A) to (D). The prescription and/or the practical beginning is as follows:

The above concrete was manufactured in usually and shows the following technical data:

To figure 1 the strength development (bending course talent/ready to be printedness) points itself gemäß the above beginning manufactured Microporenbetons Hydrotherm® S.

Figure 2 shows the moisture absorption and - delivery.

A further practical beginning of another execution form is as follows:

Figure 3 shows the strength development of the manufactured concrete.

Figure 4 shows the moisture absorption and - delivery of the concrete.

In the following becomes an example the production of Microporenbeton Hydrotherm® Sports association described.

Figure 5 shows the strength development of the manufactured concrete.

Figure 6 shows the moisture absorption and - delivery of the concrete.

A further beginning for the production of a Microporenbeton Hydrotherm® Sports association is as follows:

Figure 7 shows the strength development of the concrete.

Figure 8 shows the moisture absorption and - delivery of the concrete.

A practical beginning for the production of Microporenbeton Hydrotherm sports association is as follows:

Figure 9 shows the strength development of the concrete.

Figure 10 shows the Feuchtigkeistaufnahme and - delivery of the concrete.

From the above example 5 it follows that a very small material decrease results with the finished concrete after 28 days. Further very good mechanical values result, as comes out from the above table.

Figure 11 shows a rem admission erfindungsgemäß EN of micropore concrete gemäß Example 5 with a pore diameter on the average of 0,5 µm and fine capillaries within the µm range.