Concrete psi

[bluedog225]

That sums it up. I plan for 25% screw up in most things. Seems to end up about where originally intended.

 

[Old tool guy]

Get some cores pulled and tested. I did and paid for 3000 psi concrete. I ended up with less than half of that

1700 psi on a 40 hour break? Sounds like it will meet spec. What’s your point?

 

[WNYflyer]

1700 psi on a 40 hour break? Sounds like it will meet spec. What’s your point?

1700 psi 40 hours after it was cored. No indication that I can see on when the concrete was actually installed.

 

[Old tool guy]

1700 psi 40 hours after it was cored. No indication that I can see on when the concrete was actually installed.

I see what you are saying, but that info is misleading. Why would they use the time after coring to determine the strength?

 

[FL Guy]

1700 psi 40 hours after it was cored. No indication that I can see on when the concrete was actually installed.

I see what you are saying, but that info is misleading. Why would they use the time after coring to determine the strength?

Simmer down old guy!

It was cored 4 months later

 

[Old tool guy]

Simmer down old guy!

It was cored 4 months later

I’m down. Way down.
Where does it say 4 months?

 

[dogdog]

We don't want to go this far. We do however have a pile of the cement next to our apron pour that they left behind.

I think you have to core drill to get accurate testing results…not 100% sure you would have to contact the lab that is doing the testing

 

[Ricky Joe]

I used to work for a company that inspected jobs in progress and tested concrete. We did slump tests and took samples to be tested. Then the contractor would request the driver to add water so he could work the concrete easier. So what got tested was seldom what got poured. They also tested mortar and did soil compaction tests. Failing results were reported as tester or sample error. I think the company existed primarily to siphon funds off the job. There were never fails or improper results. What the testing revealed could always be adjusted in the reports. But it looked good!

 

[Bill T]

Amen to AEADAM post. I provide Technical Support to concrete placements nearly everyday (Nuclear). First, concrete cracks. Control joints do just that, control the cracking. Cracks in an apron- if you lose the integrity of the apron due to the crack, there are more issues than just the mix. You could write a thesis on why concrete cracks (many have). A little information from the internet or second hand information is a dangerous thing. Use a reputable contractor (investigate him through Better Buisness Bureau, friends who have used him, etc...). That is your best defense against shoddy work. Getting the mix or batching ticket is of little use at this point. On a small job, if a customer doesn't request the ticket at time of placement, the ticket was likely thrown away that day.