Concrete Volumes per m3

I recently did a foundation for a fellow...I poured the footings first and then stood the forms for the walls....When it came time to order the concrete i did a standard measure of all the height x widths x depth.. I came out with 14.5 cubic metres...net measure for the walls....And I added 0.6 of a metre for the pump.. So...when pourday came...We poured the walls and I was on the hose and wasn't to sloppy...But at the end of the day...Even after using the 0.6 metre for the pump we were 0.8 m3 short...So here's the mystery.. Is there a difference in volume, before concrete is vibrated, and after???
I think there is, but i've had people say different because when it comes frtom the plant it is dry...So any guru's out there...Please feel free to answer..I'd appreciate so conclusion to the matter...

 

Depending upon the mix design, it is technically possible that you vibrated out that much volume. More likely though is the spreading of the forms and/or spillage.

What do you think, ConcreteMasonry?

 

OK, I just talked to the Guru (My Pops) and he asked how much did you get on your shoes, because it isn't shrink from vibration.

 

Could be maybe the truck was a bit short to start with?? or he helped a buddy out on the way over with a little pour of his own??

 

They carry a weight ticket when they leave the plant, and he said that it was a dry-mix, so it is metered at the jobsite. Also, as a rule, a ready-mix truck doesn't have time to go pour off a yard for his bud on the way to the jobsite.

 

k thanks guys... It solves it for me i think the sweet sounding people at the plant shorted us then....or like the one fella said...he stopped off to help someone out....and by the way...The mix was already kicking off by the time we had finished the pour....Hardly any trowel time a'tall...Ever hear the expression...harder than the back of gods head???...That's what it was....But we're up here on the sunshine coast in B.C....Construction is booming,,,due to the 2010 olympics....All the rich folks think this is the place to be....Good for them...Good for us!!!

 

Check your weight tickets. That is what they are for.