At first glance, a concrete stone wall sounds like an aesthetically rather questionable enclosure or property border. There is now a very large selection of exposed concrete and surface textures and imitation stone that clearly stand out from the reputation of gray and rather ugly-looking masonry.
Inexpensive and large selection
Anyone building a concrete block wall has a large selection of designs and looks due to the many possible processing techniques. By mixing in color particles and mineral additives, the colors also vary.
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Advantages of a concrete block wall are above all the lower price compared to real stone and the good workability. Due to the large selection, a concrete stone wall can be adapted very naturally to the garden.
Types of processing and the resulting optics
The process, also known as etching, creates rather random patterns on the concrete surfaces. If successful, they can be compared with the structures and textures of irregular natural stone images such as marble.
The working of stones with a sledgehammer is summarized under bossing. This gives the concrete blocks a wavy and cloudy look that also extends to the edges.
In several passes, the concrete blocks are exposed to a flame at temperatures of over 3000 degrees Celsius. This creates a fine-grained surface that is often sanded off and reworked using another mechanical process.
Fine "shattering" of the surface, which creates a noble roughness and represents a kind of "soft" point.
Rough sawn is its own variable optics, the optical result of which depends on the type of concrete and the sawing process. The surfaces range from smooth to partially "torn ".
With a flat chisel, the chisel iron, horizontal grooves are made in the concrete block.
Grinding and polishing
Similar to sawing, the optical results depend on the type of concrete and the grinding and polishing agents used. The surfaces can be worked up to be mirror-smooth and shiny.
The "finer " type of bossing. With a small hammer and a pointed iron, indentations between ten and thirty millimeters are made in the concrete surface. The appearance looks rough and the basic color is lightened.
Related machining of sharpening with similar optical results including brightening.
With different blasting materials, the surfaces are under great pressure. Sand and steel balls, in addition to being round, also angular and unevenly shaped, lead to finely chiseled to smooth surfaces, which then only have to be dusted.
Staining methods and means
Concrete blocks are available in almost every imaginable color and can have both homogeneous and heterogeneous structured patterns and textures. In connection with the mechanical processing of the surfaces, concrete stone walls are created in this way, which can hardly be distinguished from natural stone walls.
In the following video, a do-it-yourselfer explains how the principle of coloring works using concrete slabs that he cast himself: