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Solid Precast Concrete, pre-stressed slab

  • S-P-01455 Image 1.jpg

Product information

The solid precast concrete, pre-stressed, slab has many advantages. The built in tension of high-strength multi wire strands in combination with the thickness of the slab leave room for plumbing as well as creating a sturdy construction without the need of post

shores. This allows for a shorter construction time as well as a safer work environment.

The solid pre-stressed slabs come in lengths up to 10 meters and widths up to 3,2 meters. If the customer wish, the products can be completed with conduits for electrical wires or plumbing. This, however, is not included in the EPD.

All products are manufactured indoors, which ensures a high and even quality throughout the year.

Since each product is custom made new drawings are made before the production process starts. The products are optimized for each project. In this phase of the project, the customer has the opportunity to make choices that affects the entire lifecycle of the building, e.g. reference service life, product dimension etc.

Raw materials are purchased and transported to the factory. The raw material that has the biggest impact on the climate is the production of cement. During the production, in the cement factory, a process called calcination is taking place. During the calcination, CO2 is released from the limestone. The finished concrete, however, can retrieve some of this CO2 during its lifetime. Up to 1/5 of the CO2, which is released during the cement production, can be retrieved by the concrete. This is an important fact to consider when making a life cycle analyses for an entire building. It has not been considered in this EPD since it does not include the end of life perspective.

In the factory, a mold is prepared. It can be made of different types of materials such as steel or wood. This includes making the holes and openings that are needed for e.g. installations and windows.

The reinforcement steel is prepared according to drawing. This means choosing the right quality and dimensions, bending, cutting to correct lengths and binding it together. If the customer wish to include other installations in the product such as conduits or plumbing it is also prepared at this stage of the production.

The concrete is made from aggregate, water, cement and additives. It is all mixed in a large cement mixer. There are different recipes used for different products in order to meet the different needs.

After the concrete is poured in to the mold, there is usually a need to vibrate in order to make sure that the concrete fills out the mold and surrounds the reinforcement steel appropriately. Finally, the surface of the product is worked to ensure the correct quality.

The product is then covered and left over night to harden. When the mold is removed, the product is inspected to make sure it meets the standards. If the customer wish the products could, at this stage, be completed with windows and paint before being delivered to the building site.

Detailed information

Registration number: S-P-01455
Publication/issue date: 2018-12-19
Valid until: 2023-12-18
Verified by: Carl-Otto Nevén
Reference PCR(s): PCR 2012:01 Construction products and construction services (EN 15804:A1)
Sub-PCR-G Concrete and concrete elements (EN 16757)
Geographical scope: Sweden
EN 15804: This EPD is compliant with EN 15804

Company information

Finja Prefab AB
Company name: Finja Prefab AB
Country: Sweden
Contact: Finja Prefab AB
Website: www.finjaprefab.se
Management systems: ISO 14001

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