[AT] [POSSIBLE SPAM] Re: OT - Concrete

[charliehill]

Dave,  I agree with what you said but I think you are assuming this concrete 
was poured in a quality controlled situation and my experience is that 
residential driveways usually aren't.  You are still probably right but it's 
hard to be sure.

Charlie
----- Original Message ----- 
From: "Dave Ernst" <shop at cccomm.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, May 03, 2010 10:25 AM
Subject: Re: [AT] [POSSIBLE SPAM] Re: OT - Concrete


> Frank,
> Try and find out what the mix design is, whether it is a 2500lb, or a 
> 3000lb
> mix. Proper mix designs achieve 75% of their mix design compressive 
> strength
> in 7 days. Any auto or pickup driven on it in seven days will be fine. At 
> 5
> days you will be ok also as the weight distribution of 4 wheels is less 
> than
> the comprssive strength of the concrete at 3 days.
> Dave Ernst, PE (retired)
>
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