Concrete cylinders subjected to compression tests has various forms of failures. I have read some good description of causes of some failure types, but have not seen something more comprehensive discussion of it. Any literature to help me understand these failure modes?
Hi Ronald,
ASTM C39/C39M − 15a, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” has discussed six different types of compressive strength test fracture modes for the cylindrical specimens. You may read it and if any question remains, I can help you on this matter.
i am more interested on what makes a failure like those...like what is the meaning if failure mode is splitting, or conical or brooming, etc...
thanks for the response sir Iman.
Dear Ronald,
Are your cylinders cupped? Using sand box on the ends? Or polished? The finishing of the two ends count a lot. Could you sketch the type of failures you are interested about?
like the one described above which was posted by sir Iman, if it fails conical, what does it mean? if it fails columnar.. what does it mean? etc. Im interested on all types of failures. I do have some things in mind for every type of failure, just like to have a more generalize view of it, if it can be generalized.
Dear Ronald,
Type 1 failure actually never occurs, the usual shape is type 2 if the cylinder is simply placed into the crushing machine, and there is normal friction between the concrete and the steel plates.
On the other hand if this friction can be eliminated, then type 3 can be expected. In normal cases between these (type 2 and 3) two failure shapes should be the obtained one, depending on the friction.
In case of type 4., 5. and 6. something is wrong. Type 4 indicates a problem during concreting, type 5 and 6 indicates a problem with the plainness of the top and bottom surfaces. The results obtained in such latter 3 cases should not be accepted.
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