DE10305056A1 - Process for the technical production of concrete goods with simulated natural stone or other aesthetically designed surfaces - Google Patents

Abstract

The method should make it possible to recreate natural stone surfaces or to produce noble artificial stone surfaces in a reproducible manner without expensive surface reworking. DOLLAR A This is achieved by adding water to the homogeneously mixed aggregate and cement in a mixing device and evenly mixing it in, and by using the visible grain size added at the end of the mixing process to achieve a concrete with a visible grain size not bonded by the basic matrix which can be processed further in accordance with the known prior art and the end product does not have to be subjected to any further machining process in order to make the visible grain visible on the surface. DOLLAR A The method can be used to manufacture concrete products.

Description

The The present invention relates to a method for time and inexpensive as well as energy-efficient and environmentally friendly production of single or two-layer concrete products, which on their visible side are reproducible, aesthetic artificial or have a precisely reproduced natural stone surface.

The Imitation of high-quality natural stone surfaces and the reproduction of artificial ones surfaces on concrete products is known in the prior art.

known The common method is that these concrete goods are made in one or two layers in molds become. The shapes are e.g. by means of an about them drawn filler frame with a core concrete mix of sand, cement, grit, water and if necessary, filled with lower-quality additives and using a vibrator shaken up like this that this core concrete mix is pre-compacted in the molds. Then another filling frame the facing concrete layer is applied to the core concrete layer and by shaking and pressing connected to the core concrete layer and the molding compacted.

Likewise is known to introduce these layers in reverse Sequence take place or in the single-layer production of concrete goods the core concrete can be dispensed with.

in the Connection to these basic The prior art describes a large number of manufacturing steps of processes like the surface of the exposed concrete is to be reworked or refined in order to achieve the desired to achieve optical effect.

So describes the DE-PS 198 08 484 a process for the production of artificial paving stones, which should have the appearance of natural limestone. A number of color additives that harmonize in the tint are added to the facing concrete. Lime chippings, which can still be added, are intended to enhance the natural surface effect or character of the finished surface.

To filling, Shake and pressing the facing concrete onto the core concrete in the mold there is a dry brushing the surface the facing concrete layer. Here, the relative movement of the working paving stone surface to attacking brush elements chosen so that the brush attack and thus the removal of material from the surface is completely arbitrary and random within a certain pre-adjustable removal range. By brushing about that an additional one Mixing or a kind of marbling effect of the individual Color additives in the miniature area, as well as a partial working out the lime chippings particles in the facing concrete layer done and thus created a visible surface of the finished stone which come very close to the desired natural stone effect should.

The DE-OS 30 40 876 describes a process for the production of artificial paving stones, which also have a two-layer structure. Here, a facing concrete layer with magmatic rock granulate is applied to the core concrete layer.

The Moldings produced by the known method are by means of a conveyor for dry out or set temporarily. After a setting time from about 24 to 48 hours and more these become a sand or Metal granulate blasting device supplied. Here go through the Moldings completely evenly and slowly the blasting device, its surface being sandblasted is exposed.

With the method described should be possible paving stones manufacture the visible surface the surface the paving stones made of natural stone largely corresponds.

The Methods described in the prior art have the disadvantage that that the moldings to achieve the desired surface effect, a second processing and finishing process have to. This process, in which the fresh or hardened cement slurry is washed away, -gebürstet or sandblasting is very time-consuming and expensive, requires a lot high investment for the washing, brushing or sandblasting systems, depending on the type of drying, is very energy-intensive or needed a very high interim storage capacity and high costs for the Recycle the washing water or metal granulate.

Of another is the identical replica of a natural one rock surface e.g. that of a granite or the exact reproduction of aesthetic, artificial surfaces because of the concrete sludge that is formed and subsequently removed macroscopically not given.

The invention is therefore based on the object of developing a method of the type described at the outset with which one can save time and money Produce natural stone surfaces or aesthetically artificial surfaces exactly on concrete goods during the jarring pressing of the moldings and thus no further finishing process is necessary.

This Problem is caused by the features listed in claim 1 solved.

The Advantages achieved with the invention are in particular that when mixing the basic matrix, a complete covering of the aggregate with cement paste guaranteed is.

The Mix in the visible grain guaranteed at the end of the mixing process an even distribution the visible grain in the facing concrete and at the same time prevents the visible grain surface from sticking the basic matrix.

On embodiment the invention is described in more detail below.

For the production of concrete goods with a passable or visible surface As is known, the forms are first made with a core concrete mix, consisting of aggregate, cement, grit, water and if necessary filled with lower-quality additives. Using a vibrator shaken this core concrete, so that it is pre-compressed in the form.

The abgerüttelte free volume of the form is then covered with facing concrete, that according to the inventive method was made, replenished.

According to the inventive The process is the basic matrix of the facing concrete according to concrete technology Aspects mixed. The first step is the addition of the mixing process fed. To the addition of the cement into the mixing device is the mixing time so to choose that a complete wrapping guaranteed with cement is.

Dry Colors are largely used in the reproduction of natural stone surfaces not used. Depending on the color of the end product, there will be different ones Supplements and cements used.

at customer-specific color requirements, however, is the encore of color pigments required. Also the time of adding this As is known, pigments are of the desired color Basic matrix, e.g. with a homogeneous or marbled color, depending.

To the homogeneous mixing of the aggregate and the cement becomes this Components, depending on the visible area to be achieved, water to an exact specified water cement value added and mixed.

The for the respective surfaces striking marbling is achieved by adding a special grain of the basic matrix. There are natural aggregates with precisely defined sieving in precisely defined quantities used. Depending on the one you want Color picture can do this Granites in different colors, basalts, porphyry, quartz etc. be, which according to concrete technology aspects the requirements of surcharges for concrete with special properties, such as resistance to frost and de-icing salt, satisfy.

This, the for the surface the distinctive grain of the facing concrete becomes the basic matrix later added and mixed.

With the for the respective surface or the mixing time specified in the respective recipe an even distribution the visible grain in reached the facing concrete, whereby a gluing of the grain surface with the basic matrix is avoided. Because the mixing intensity and mixing speed the length of the mixing process is the under-mixing time for each To determine and define the mixing device.

This facing concrete produced in this way is then used in the further manufacturing process fed.

To the application of the facing concrete to the pre-compacted in the form Concrete layer, both layers are made by shaking and pressing together connected and the molded product thus compacted.

The but not subsequently added to the basic matrix of the facing concrete glued and for the appearance of the end product distinctive grain, is inside the Offset concrete over the Compaction process completely covered with the basic matrix, this means, the cement paste can adhere to the subsequently added grain, similar to at a usual Adhere to the mixing process and envelop it.

During the onset of hydration (sum of all reactions that take place in the cement-water mixture and lead to stiffening, solidification and hardening over time), during which the cement grains transform into crystalline structures and combine with one another with an increase in volume, they become subsequently added visible grits when developing the strength of the facing concrete included.

The view grit of the concrete on the visible surface of the end product goes with the area with which it is connected to the basic matrix, via the compression process a permanent bond with the basic matrix.

The area the grain, which is not related to the basic matrix and in the mixing process has not been glued, it turns out to be in its original Appearance on the surface of the end product.

On subsequent Remove the basic matrix on the visible surface of the striking for the respective surface granulation is therefore no longer necessary.

Claims (2)

Process for the technical production of concrete products with simulated natural stone or other aesthetically designed surfaces, consisting of a basic matrix (aggregate, cement, water) and a visible grain, characterized in that water is added to the homogeneously mixed aggregate and cement in a mixing device and mixed in evenly and that from the base matrix thus produced, by means of the visible grain added at the end of the mixing process, a concrete with a visible grain not bonded by the basic matrix is achieved, which can be processed further according to the known prior art, that the visualization of the visible grain on the surface is not like in the conventional methods, there is an exemption and elevation over the surrounding concrete surface and that the visible grain visible on the surface does not lose its natural appearance due to pressure, impact and other external influences. A method according to claim 1, characterized in that the end product is used to make the visible grain visible the surface no further processing has to be subjected.