Selecting concrete resources

Selecting concrete resources

The major factor defining the environmental impacts of concrete is the amount of cement in the product which depends on the concrete strength class (e.g. C25/30 in Europe). If you cannot find the exact product you are using, choose one that has the same strength class.

Please note that any concrete slab includes also reinforcement steel. The name of the concrete resource tells you if the reinforcement is included or has to be added separately.

Here's how to select the most suitable resource for the specific concrete element

Hollow-core concrete slabs: there are a lot of EPDs available and they can be added by the total area or volume of the element. Make sure you choose one with the correct thickness so that the amount of air in the element will be calculated correctly.

Concrete slabs: check that the amount of concrete is correct and if the element includes reinforcement. Make sure to include reinforcement separately if it's not included in the resource.

Sandwich elements and other wall elements: if you cannot find the exact product from the manufacturer, add concrete and insulation layers separately (check the above guidance for concrete).

Concrete strength classes:

Concrete type
Strength class
Generally used for:
C20 / GEN 3
20 Newton (mPa)/28 day strength
Foundations for large walls, garages,
houses & extensions
C25 / ST 2
25 Newton (mPa)/28 day strength
Footings, foundations and reinforced bases
for houses & extensions
C30 / PAV1 / ST 3
30 Newton (mPa)/28 day strength
Pavement construction, paving external kennels
and reinforced hard standings
C35 / PAV2
35 Newton (mPa)/28 day strength
Raft foundations, piling, external slabbing and pacing, and
reinforced bases for commercial buildings
40 Newton (mPa)/28 day strength
Construction of structural and support beams
footings and foundations, roadworks

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