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Re: Concrete specifications[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Concrete specifications
- From: "Jie Lu, P.E., S.E." <jayjielu(--nospam--at)worldinter.net>
- Date: Tue, 9 Feb 1999 18:08:40 -0600
Hi Bill: I have a question regarding concrete strength requirement. BOCA and UBC refer to ACI 318 for concrete strength for constructions other than residential buildings in regard to severe exposure conditions. The Table in the ACI 318 requires 4500 psi for concrete exposed to freezing and thawing in a moist condition. In my interpretation, the exterior concrete foundation wall within frost depth would be in this category for buildings in St. Louis and Chicago area. Because the constant cycles of freezing and thawing would put exterior concrete wall in contact with soil in moist condition. However, the local practice in St. Louis is to use 3000 psi concrete for all foundations in most cases. I tried to specify 4000 psi concrete for couple of projects. But I got lots of resistance from local contractors. I also tried to find some reference material regarding to the ACI 318's Table. But my effort was in vain. I contacted BOCA code official last year, they concurred with my code interpretation. However, I would raise this question again to see if someone would have more background information. Thanks, Jie Lu, P.E., S.E. J. Lu International, LLC -----Original Message----- From: Bill Sherman <SHERMANWC(--nospam--at)cdm.com> To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org> Date: Monday, February 08, 1999 6:43 PM Subject: Concrete specifications I am an Associate Member of ACI Committee 301 and there is some discussion of how ACI codes and standard specifications are intended to be used in the committee. So I would like some input from other practicing engineers on how they use ACI documents to specify concrete: 1. Do you specify concrete by reference to ACI 301 or do you have your own concrete specification independent of ACI 301? 2. If you reference ACI 301 from your project specifications: a) Do you reference ACI 301 in full or only portions of it? b) Do you also reference other standard ACI specifications (such as 306.1 for Cold Weather Concreting, etc)? or Standard Practices (such as ACI 308 or Curing Concrete)? or ACI "Guides" (such as 305R for Hot Weather Concreting or 350R for Environmental Engineering Concrete Structures)? c) Do you reference the ACI 318 Building Code from your project specifications? 3. Have you encountered any problems with inconsistencies between ACI 301 and another ACI code or standard specification?
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