testing of concrete
testing of concrete
(OP)
I have used concrete hand made.it was silly ,but now is done.
After testing cylinders( 28 days) got average strength 12 MPa.not satisfied I used Schmidt Hammer after 28 days, and got average 16 MPa.what a discrepancy.
Is there any correlation between cylinders and rebound numbers results.I was told the hammer gives always 2.5 MPa more than cylinders.
Hard to believe, both generated doubt in my mind, and I will have to accept the concrete without doing anything.
My fate.
After testing cylinders( 28 days) got average strength 12 MPa.not satisfied I used Schmidt Hammer after 28 days, and got average 16 MPa.what a discrepancy.
Is there any correlation between cylinders and rebound numbers results.I was told the hammer gives always 2.5 MPa more than cylinders.
Hard to believe, both generated doubt in my mind, and I will have to accept the concrete without doing anything.
My fate.






RE: testing of concrete
RE: testing of concrete
I have done previously compressive tests, it was a period of turbulence in the company who did the test, and I actually didn´t see how they have done.posteriorly I hired another company to run the hammer test, this last result came showing strenght( based on the Rebound values) far above the cylinders at 28 days.The test was done in the columns( 26 columns) of concrete.
each point taken 12 points and find the average .
Globally their statistics show fc28 of 10 MPa(1430psi) versus fck of 16MPa(2286psi) ,respectively for concrete cylinders, and hammer.
Now I am more in doubt than initially,but suspect the tests were not well done.samples were not appropriately prepared,my guess.
I thank any one who can show me any correlation between these two averages.
RE: testing of concrete