Ordering concrete

When ordering a pre-mixed concrete we must give the supplier at least the following informa-tion:

a) Quantity: e.g. 60 m³

b) Concrete strength class e.g. C30/37 [*]NoteIf the concrete strength class e.g. C30/37, surpasses the need for cement, the reference to the minimum amount of cement is optional.

c) Slump Class: e.g. S3 [*]NoteIn concrete where 4th generation super – plasticizer are used, the slump class can be ignored as it is always above the minimum. .

d) Super-plasticizer: e.g. YES (placed on order at the building site)[*]Notesee paragraph 2.4.4 .

e) Pump’s size: e.g. 36 m

f) Time between truckloads: e.g. every 30 minutes.

g) Environmental exposure category e.g. S1 (sea side environment).

i) Concrete strength category e.g. ΙΙ / 42.5.

k) Maximum nominal value of the largest aggregate grain e.g. π.χ. 31.5 mm.

j) The maximum ratio of Water/ Concrete (Ν/Τ), e.g. Ν/Τ ≤ 0.55.

l) Compliance to ΕΝ 206-1 form.