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

[Frank]

I agree but..you don't have a clue of two variables.mix design and what is
he going to put on it?

Frank

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dave Ernst
Sent: Monday, May 03, 2010 8:25 AM
To: Antique tractor email discussion group
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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