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Re: compressive strength testing on cored concrete -

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     Alex,
     
     The original post indicated that the concrete structure in question is 
     for a water filtration plant.  Assuming this is a water retaining 
     structure with possible waste water, you want low permeability 
     concrete with good resistance to chlorides and sulfates.  See ACI 318 
     Tables 4.2.2 and 4.3.1 as a start.  Today you would use 4000 psi 
     concrete as a minimum and more likely 5000 psi.
     
     Thomas Hunt, S.E.
     Fluor Daniel


______________________________ Forward Header __________________________________
Subject: Re: compressive strength testing on cored concrete -
Author:  "Alex C. Nacionales" <alexcnac(--nospam--at)easycom.net> at fdinet
Date:    5/25/99 5:12 AM


Thomas,
What's wrong with 3000 psi concrete. It is a minumum allowed by the code.
     
     
Alex C. Nacionales, C.E.
A.C. Nacionales Construction
Iloilo City, Philippines
     
----- Original Message -----
From: <Tom.Hunt(--nospam--at)fluordaniel.com>
To: <SEAINT(--nospam--at)seaint.org>
Sent: Tuesday, May 25, 1999 12:45 AM
Subject: compressive strength testing on cored concrete -
     
     
>      Steve,
>
>      For the early 1950's, 2500 psi concrete was probably not unusual.  In 
>      fact I see 2500 psi and 3000 psi today in some of our client
>      specifications (personally I would not recommend it!). 
>
>      You also might check the core testing reports.  I assume you followed 
>      ASTM C42 for the core testing.  If so, there are requirements for
>      length to diameter ratios and if you are outside these ratios you 
need
>      to apply correction factors.  There are also some "coefficients of 
>      variation" you may need to apply.
>
>      Thomas Hunt, S.E.
>      Fluor Daniel
>
>
> ______________________________ Forward Header 
__________________________________
> Subject: compressive strength testing on cored concrete - 
> Author:  STEVE BIAN <sbian(--nospam--at)yahoo.com> at fdinet
> Date:    5/21/99 11:36 AM
>