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

[Cecil Bearden]

charliehill wrote:
> 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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>   
When we poured the floor for my 40 x 100 bldg, I had spec'd 3500 psi low 
slump and added polymer to make it pour easier for the contractor.   
Contractor was a good friend of my Dad's, and really a good contractor 
also.  He had a couple of guys come in to help with the pour.  They had 
50 gallons of water added to each load...  Concrete cracked every 8 ft.  
Even with control cuts.  Contacted the concrete company (largest in OK) 
they said no guarantee because water was added at the site.  As an 
engineer who had worked on multi-million dollar projects, I wanted the 
contractor to tear it out and redo it...   My dad who had loaned me the 
money to build the building would not hear of it, and told me I should 
not have added that %$#&&&^ polymer.  The polymer was to make it easier 
for the contractor so he would not have to add water to get it to flow.

Go figure. 

Never borrow money from family.  /A bank would have made him take it out...

Cecil in OKla