Reliable Concrete test
Reliable Concrete test
(OP)
The ACI Code uses cylinder test while the British standars specifies the cube test to determine the compressive strength of concrete. Which method is more reliable?
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RE: Reliable Concrete test
Brit engineer: they cubes are better.
This sounds like it would take a mini-Master's thesis to compare oodles of test results and set up a statistical comparison with test breaks verses in-field core samples, or something like that.
RE: Reliable Concrete test
Fred J. Croen, RSM
Engius, LLC
Boston, MA
www: engius.com
RE: Reliable Concrete test
RE: Reliable Concrete test
A wise individual told me something years ago that has the "ring of truth":
The cylinders have a huge surface area to concrete volume ratio when compared to typical in situ concrete. When moisture, temperature, etc. of the test cylinder are carefully controlled, history indicates that this is a fair approximation of what the majority of a given (in situ) concrete placement experiences.
www.SlideRuleEra.net
RE: Reliable Concrete test
A perfect structure would be a sphere, like a basketball.
Well, since we can't design with spheres, there is always a trade-off of a combination of spheres and rectangles and triangles/etc.
Where is the pressure being applied? (Concrete acts the same as wood or any other material) If the pressure is applied on the side, it would emulate and arch or square. If the pressure is applied on the top, it would practically be identical, unless it is convex or concave at the top.
Other things, though rarely considered are outside forces.
Say you have pressure one 2 sides, rather than just one side?
All in all, I would have to go with the cylinder.
It emulates a arch, which is the strongest ????, but again, it is all where the pressure is applied.
Regards,
RE: Reliable Concrete test