MORTAR CUBES compressive strength, asap please
MORTAR CUBES compressive strength, asap please
(OP)
Can anyone provide me with information regarding the reliability of using 7-day breaks to gauge the 28-day compressive strength. With standard 6"x12" cylinders, about 65% of 28-day strength after 7 days of curing is reasonable. Is there a similar "rule-of-thumb" for cubes, or does the geometry of the specimen prevent any reasonable gauging of 28-day performance?
Thanks
Thanks





RE: MORTAR CUBES compressive strength, asap please
RE: MORTAR CUBES compressive strength, asap please
If by cubes you refer to mortar cubes that are 50mm in dimension, the cubes are usually made using a standard (Ottawa) sand whereas the cylinders use job mix aggregates. Too many variables for accurate prediction.
If you are referring to concrete cubes used in Great Britain for example, I would assume that a correlation could be established.
If you are looking for a way to reduce test specimen size, use the 100mm x 200mm cylinders - correlations do exist and have been published. The best way is to develop your own correlation curves, though.
RE: MORTAR CUBES compressive strength, asap please
Good comments Laser28 -
RE: MORTAR CUBES compressive strength, asap please
I would suggest you ask the ready mix supplier for strength gain curves for you specific mix design to help you assess the predictability.
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RE: MORTAR CUBES compressive strength, asap please
"And of course, the addition of slag, fly ash and or silica fume will all have an effect on the rate of strength gain."
Slagging my post will not get you points! My comment regarding rate of strength gain is based on "cement" not on "cementitious materials" or concretes containing supplementary cementing materials.
Of course, the correct answer to the original question is:
"IT DEPENDS..."
I agree with going to the source for strength gain curves, but I would contact the cement producer as well.
RE: MORTAR CUBES compressive strength, asap please
My point remains....get more info.
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