IS it possible that wet materials can affect the volume calculation of readymix. I order a lot of concrete and seldom do I ever run short. I recently ordered concrete after a heavy rainstorm and ran short. The driver told me that the sand pile was saturated with water at the batch plant. I know that concrete is batched by weight and I was wondering if wet materials may effect the final volume of the cncrete delivered.
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If the concrete is batched by weight, then it seems logical that the concrete company didn't use enough sand.
Volume is volume...if you are ordering 10 yards of concrete..then that's what you should get regardless of material weight...
There are calculations used when the separate materials are wet...the plant should be checking moisture content of each component and adjusting the mix to compensate...
But what you order is what should be on that truck...
I know for a fact that the plant dosen't check or make allowance for wet sand though they probably just cut back on the water added to the mix. So I guess what I,m paying for is water. Also on the day that I ran short that there was a unusually large amount of cement water in the basement . I was pouring walls for a sewerage treatment plant at the time and the floor was already poured.
Edited 2/28/2005 8:25 am ET by dolson
That being the case, you should have cylinders taken and tested..If the mix is too wet, the strength will be off...if you are expecting 3000 or 4000 psi concrete, you may be getting that...
Do you have controlled inspections on site???