How to extend the lifespan of laminated plywood for formwork systems?

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Technical recommendations for the use of coated plywood in formwork systems.

The high strength, stability of parameters, and reduced weight make coated plywood an optimal material for use in formwork systems. The plywood has greater resistance to moisture and can be easily machined. The product is intended for repeated use as formwork material. Compliance with transportation, storage, and execution standards for formwork work allows for an increased service life of the plywood.

Transportation

To protect the plywood from atmospheric precipitation during transportation, it is recommended to use covered vehicles according to the existing goods transportation regulations for each type of vehicle. All types of deformations caused by excessive tensioning of the securing straps, moisture, or other negative factors should be avoided.

Storage

The plywood should be stored in packages placed horizontally, in closed premises that protect it from precipitation, at a temperature between minus 40 °C and plus 50 °C, with a relative humidity of the air not exceeding 80%. For boards up to 2500 mm wide, the number of wooden spacers must be at least three; for boards wider than 2500 mm, at least four.

Execution of formwork work

The cutting of the plywood to the desired size and shape is done with band saws or circular saws. To avoid damage to the corners and the formation of splinters, the cutting process should start perpendicular to the direction of the fibers of the visible face of the material. If using a circular saw, the preferred cutting regime is a high rotation speed of the blade combined with a low feed rate.

For drilling holes, it is recommended to use a sharp drill bit with a front cutter, starting the drilling from the visible face. To prevent moisture absorption by the plywood after cutting, drilling, or other types of machining, the edges must be treated with special waterproof paints, and the holes filled with silicone adhesive. The joints between the plywood panels in the formwork system should be sealed with special self-adhesive tape or the edges treated additionally to prevent moisture penetration during formwork work, as the factory-applied paint does not provide 100% protection against moisture.

To prevent adherence of the concrete and the detachment of the film during the dismantling of the formwork system, before pouring the concrete mix, the surface of the formwork in contact with the concrete must be treated with a special release agent. The release agent is applied in a thin layer on a clean surface. After application, the surface of the formwork system must be protected from dirt, precipitation, and solar radiation; the release agent must not come into contact with the reinforcement or embedded elements.

Dismantling and reuse of the panels

After completing the formwork work, the surface of the plywood must be carefully cleaned of concrete mix residues, and the material should be air-dried. The need for drying is due to the fact that during prolonged use of the plywood as formwork, the moisture content in the panels increases significantly, reducing their strength characteristics; natural drying ensures drying without deformation.

When dismantling the formwork system, to avoid mechanical damage, it is not allowed to throw the plywood panels or drag them on the ground. The plywood intended for mounting the formwork of the next levels must be carefully stacked and lifted using a crane. If after stripping the surface of the plywood shows small chips or scratches on the face or edges, before reuse, the damaged areas must be treated with special water-based acrylic or silicone paints. It is not allowed to use plywood panels with significant deformations for subsequent pours; panels with slight deformations can only be used for auxiliary work.

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