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RE: Concrete Exposed to Sulfates[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Concrete Exposed to Sulfates
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Sat, 13 Feb 1999 10:32:58 -0700
See below for responses. Harold Sprague -----Original Message----- From: TwoWids(--nospam--at)aol.com [mailto:TwoWids(--nospam--at)aol.com] Sent: Thursday, February 11, 1999 8:38 PM To: seaint(--nospam--at)seaint.org Subject: Concrete Exposed to Sulfates I would be interested in hearing from others how they are applying or interpreting UBC Sec. 1904.3 and Table 19A-3 in regards to sulfates in the soil. There are some issues regarding foundation failures that I am reviewing that may or may not have been caused by applying these sections to the design. Here are some scenarios: 1. If sulfates are known to exist, do you call out both the water-cement ratio and the concrete strength per T-19-A3? **** Yes ****** 2. If the required concrete strength per the Table is greater than the design strength, which may very well be the case, do you require special inspection to verify? ***** Your specified strength should be at least that required in the table. How do you verify the water-cement ratio? ***** It should be on the mix design submittal sheet and is generally implicitly verified by the delivery ticket. I don't know of any way to test this in the field. 3. If the foundation system is not required to be designed/engineererd, such as a conventional framing foundation, would the sulfate exposure requirements of Chapter 19 be applied? ***** Yes Section 1802 seems to require all concrete foundations must conform to Chapter 19. 4. If you have sulfates and you design/engineer a portion of a foundation (and provide the strength and water-cement ratio for that portion) would you also provide the same for adjacent non-engineered footings? **** Yes 5. What do you tell the owner about the cost of all this testing? **** Tell him that it is required. What do you tell the contractor when he can't pump or work the .45 water-cement ratio concrete? **** A mix with mid range and/or high range water reducers can be designed to be either pumped in a line pump or overhead pumped. Thanks for you input...Steve W.
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