Core Sample Cube-Cylinder Strength

[Godfrey]

Hello friends, although the existing concrete class is C18 in the core pressure strength reports for the building I will perform performance analysis, the average compressive strength is 23.59 N/mm2 in the foundation beams, 24.96 N/mm2 in the basement floor columns and beams, 23 in the ground floor columns and beams, 43 N/mm2, 25.25 N/mm2 values were determined in the first floor columns and beams. I read the additional notes section of the report, it says that the samples were tested on the basis of h=d equality and their strength values are 15x15x15 cube values. My question here is that the concrete compressive strength that we will define to the program for performance analysis should be the cylinder pressure strength, right? Also, how do we convert the calculated values for these cube samples to the cylindrical sample strength? From the 4 separate reports I gave above, I need to take the value of 23.43 N/mm2, which is the smallest average compressive strength, and multiply it by which coefficient and enter the program. Thanks a lot, good work...

 

[aksa]

The order of calculation is as follows: subtract the standard deviation value of the core samples from the mean of the pressure values of the core samples and multiply by the coefficient of 0.80 to get the cylinder sample value. (Conversion coefficient of cube sample to cylindrical sample is 0.80 in C12/15, C16/20, C20/25, C25/30.) good work...

 

[Godfrey]

The calculation order is as follows, subtract the standard deviation value of the core samples from the average of the pressure values of the core samples and multiply by the coefficient of 0.80 to get the cylinder sample value (conversion coefficient of cube sample to cylinder sample C12/15 ,C16/ 20, C20/25, C25/30 are 0.80.) Good work...

Thank you very much, I saw the work of Ünver brain just now. It is very well prepared. Actually, exactly the cube samples in C18 concrete are not suitable for cylinder strength. we have to multiply it by 18/22 = 0.818 (of course, plain logic) to convert it. It's actually simple, but it doesn't work when you don't know, thanks again, good work.