concrete strength
concrete strength
(OP)
Has any one experianced a recorded crushing srength from a cube of belowe strength at 28 days if the the specefication of concrete strenth was C35 and the recorded slump taken on site was between 75 and 100





RE: concrete strength
However, this does not sound the death knell for your structure. The acceptance of concrete is calculated on a statistical basis. If you read your design code there will be an acceptable level of cube failures. You need to record ALL of the cube results you have ( there is a minimum number of results required to make a valid population). You then undertake a statistical analysis based on the mean plus or minus a set number of standard deviations. This will then tell you the number of results which can fall below a given strength level.
Regards
Andy Machon