Compressive strength of concrete is estimated by using UTM/CTM machine by breaking the specimen. Is there any technique by which the specimen remains intact and we can get the compressive strength?
There are several indirect tests that we can use to estimate the compressive strength of concrete. We can use Rebound hammer or PUNDIT velocity tests. In my research university, i have seen research using needle penetration test, where the penetration rate can be correlated to the concrete compressive strength. All above mentioned are non-destructible technique.
There are several indirect tests that we can use to estimate the compressive strength of concrete. We can use Rebound hammer or PUNDIT velocity tests. In my research university, i have seen research using needle penetration test, where the penetration rate can be correlated to the concrete compressive strength. All above mentioned are non-destructible technique.
Dear Colleague Khun,
Do you have any reference or literature that shows how can I correlate the above said non destructible tests with compressive strength, so that I can get strength values not that the strength increases or decreases, a particular value; or any equation or formulae.
Thanks.
Attached please find two chapters of the book "Testing of Concrete in Structures". These documents will help you to study the surface hardness methods and ultrasonic pulse velocity methods. Best regards.
There are several non -destructive methods of estimating the strength of concrete some of which includes rebound hammer test,ultrasonic pulse velocity method,visual impact method,spectral analysis of surface waves,impedance logging,radiography,half cell potential,polarization methods,penetrability method,Radar methods e.t.c
As stated by Ma Chau Khun, there are NDT methods are available to estimate the compressive strength, but they are qualitative methods. By PUNDIT Velocity tests, we should not predict the compressive strength of any concrete. It is meant for only to assess the concrete quality interims of integrity and homogeneity that gives the compaction level.
An experiment I conducted earlier showed a good correlation of strength with O2 permeability of concrete, which can be used to predict strength. However, that would be a more difficult method to predict compared to ultrasonic pulse tests which is easy and convenient
Hello
There are several simple methods. There is an extensive report by ACI. Make your own search on the web and you will be satisfied.
IMPORTANT: Note that all the methods are approximate. Be careful if you use them in practice. They cannot be reckoned for actual strength.
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