Strenght Of Cement

Of course, the final strength of concrete does not depend only on the water amount (w/c ratio), but also on the characteristics of cement. Since there is no way for determining the strength directly on cement powder, the “strength of cement” is defined as the 28-days strength of a standard mortar (prepared according to standard procedures). On the cement bag, the strength is reported, along with the type of cement (Portland, fly-ash cement, etc.).It’s noteworthy that the compressive strength of concrete cannot be “calculated” on the basis of the strength of cement, as it depends also on water and aggregates: it must be experimentally determined.