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The pour was of less then 5 yards (2.8 cubic metres). I know the standards say a test per day, per mix design and no less then one for each 75 yards (100 cubic metres here witch equals to 130 cu. yards). The owner of the building will just have a fit seeing a 185$ test on 5 yards of concrete...

The contractor ran into a slight problem and will not be able to pour the walls. He is only pouring one column with 2.8 cu.m of concrete. Does this require a test or is it below the minimum concrete volume required for a test... if there is any.

Good stuff guys, thanks alot for your input. My cylinders did not freez however, they just got very cold, 2C (I think thats like about 35F) so that is not the issue. It's having to try to justify to the engineer that the concrete results are still valid that is being a tough sell. He does have...

I recently had a few test cylinders cure in the initial 24 hr below the CSA standard of 20 +/- 5 deg. C. My cylinders cured between 15 deg C to in one extream case 2 deg C. All my samples however passed the 7 day test above the required 30 mPa averaging 31 mPa. Would the initial curing time have...

Thanks alot eh for the tips.

Hey. I have a few big jobs coming up and I would like to know how many trucks I should run a concrete test (slump, air, cylinders) out of say 10 trucks. The client of course wants to save as much money as he can but I want to make sure the number of cylinders I cast is representative of what was...