Exposed aggregate concrete was mainly used in architecture in the 1960s and 70s and has a characteristic relief-like surface structure. It is caused by the washing out of the cement glue. In the process, the normally covered aggregates become visible.
The production process can be carried out in two different processes: the negative and the positive process.
In the negative process, a contact retardant is applied to the formwork. 16 to 24 hours after stripping, the concrete surface can then be treated with water and a brush, thus washing off the unhardened layer of cement glue on the surface.
In the positive process, the retardant is only applied after stripping. The processing afterwards is carried out as in the negative procedure.
only thing that actually makes sense is the production of high-quality prefabricated exposed concrete elements in the factory. This is because the appearance of the finished concrete surfaces can only be controlled when lying down.
The solidification retardant used in in-situ concrete construction, which is usually applied to the formwork as a paste, eliminates the need for release agents.
Washout depths usually vary from 1 - 6 mm and can be chosen very precisely.
Precast exposed concrete elements are usually produced as a two-layer prefabricated element, a structurally dimensioned core layer of reinforced concrete with an exposed aggregate concrete attachment.
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