concrete technology
concrete technology
(OP)
hi guys...
just wanna ask : is the hammer test results, say an average of 3500psi corresponds to 3500psi compressive strength of the concrete structure?
we conducted the rebound hammer test for an RC wall with a specified compressive strength of 3500psi @ 28days...the age of concrete is about 120days. base on the results,we are getting about 4130psi...
was the average test result in compliance to the parameter or specified strength?
thank you for any advise and insights...
just wanna ask : is the hammer test results, say an average of 3500psi corresponds to 3500psi compressive strength of the concrete structure?
we conducted the rebound hammer test for an RC wall with a specified compressive strength of 3500psi @ 28days...the age of concrete is about 120days. base on the results,we are getting about 4130psi...
was the average test result in compliance to the parameter or specified strength?
thank you for any advise and insights...





RE: concrete technology
The purpose of the rebound hammer is to assess uniformity or consistency of the hardened concrete. That means that you do a grid survey with the hammer and determine the relative differences in the results so that you can group like results together and delineate different placements or characteristics of the concrete.
To determine the compressive strength, you then need to core the concrete and test the cores.
I don't know which standards you are using for your testing, but in the US, the standard is ASTM C805, which specifically warns against using the rebound hammer to assess compressive strength.
RE: concrete technology
Dik
RE: concrete technology