Grade or class is the main indicator of concrete mix quality that is usually the focus of attention for those purchasing concrete. The other indicators, such as: Frost resistance, mobility, waterproofing capacity are second important topics here. Initially, however, the choice is made in favour of the grade or class. Generally, the concrete strength is rather variable feature that gains throughout the whole curing process.
Concrete strength, grade, class. Test methods. Test samples.
|cement grade||M 100||M 150||M 200||M 250||M 300||M 350||M 400|
|B 7.5||B 10||B 15||B 20||B 22.5||B 25||B 30|
* Actual material consumption for 1 m3 of concrete mix including water absorption of inert materials and concrete cube strength.
M 100 / B 7.5 - Preparation works before starting concrete placement for monolithic slabs and foundation. It is also applied as a concrete pad in road construction works.
M 150 / B 10 - Preparation works before starting concrete placement for monolithic foundation; foundations for small building spaces; for filling floors and screeds, concreting roads.
M 200 / B 15 - Manufacturing foundations, floors, screeds, concreting roads, raft and piled foundations, stairways.
M 250 / B 20 - Monolithic foundations.
M 300 / B 22.5 - Monolithic foundations, fences, walls, stairways, floor slabs. The most demanded concrete grade.
M 350 / B 25 - Floor slabs, columns, monolithic walls, pool decks, beams and crossbars.
M 400 / B 30 - Bridge conduits, columns, crossbars, bank vaults and other structures with special requirements.