In the word origin from printing, a matrix is understood to be a "metal form used in the type foundry with letters embossed laterally inverted, which provides the letters". (s.Duden: "Matrix")
In concrete technology, formliners are used as so-called formwork matrices, i.e. flat profiles made of silicone, polyurethane, rubber or plastic, the surface of which contains the negative image of the exposed concrete structure that will later be desired on the concrete surface.
Image: formliner SELECT with exposed concrete surface - RECKLI
Formwork formliners are glued, nailed or otherwise applied to the formwork of in-situ concrete. In the case of precast concrete elements, the formliners can simply be inserted into the formwork, as the concreting process is usually carried out horizontally.
planning, a distinction is made between individual matrices, which contain individual patterns desired by the architect or client, and standard matrices (structural matrices), which mainly contain repetitive patterns (e.g. exposed aggregate concrete surfaces) and are designed in such a way that they can create almost seamless structures.
RECKLI offers the matrices SELECT (structural matrices) and UNIQUE (individual matrices) for these different applications.
Image: Matrix UNIQUE at Forum Z by pool Architekten - RECKLI
In order to ensure seamless execution, the arrangement of the structural formliners must be coordinated with the formwork panels during the planning phase.
Production - From model to cast
01. Model
First a model must be designed, this can be done by hand, as an impression, or in CAD. The model is then milled into a panel material. The master form is either modeled from plaster or computer-aided: image templates and digital drawings are converted into a file for the CNC milling machine on the computer. It mills the structure into a panel material.
02.
The model is sealed with a separating wax and provided with a peeling frame. A liquid elastomer is then poured onto the model to produce the
structural die.
03.
The high elasticity of the die allows the structure to be reproduced in detail and makes it very robust. (can be used up to 100 times)
4.
waxed.
5.
Image: Pouring concrete - RECKLI GmbH
06.
Image: Stripping - RECKLI GmbH
order to achieve optimal results, the mixture of the concrete (normal, lightweight and heavy concrete are best suited) must be matched to the formliners in advance.
By choosing special release agents, the die can be easily detached from the concrete surface after hardening.
In this case, it is advisable to create so-called sample surfaces (mock-ups) in the execution in order to test the elimination and result in advance.
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