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Concrete with high air content[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Concrete with high air content
- From: DougSnow(--nospam--at)aol.com
- Date: Fri, 9 Oct 1998 10:03:22 EDT
I got a question from the field where the Contractor is building a school in a rural area that is subject to freeze/thaw cycles. He found that the concrete had 8% air entrainment where the specifications were for 4%. ACI 318-95 Table 4.2.1 states that for 1-1/2" aggregate size and for moderate exposure, the air content should be 4-1/2%. Is there any effect on the concrete if the air content is too high? I couldn't think of any but I though I would throw it out for discussion. By the way, it seemed unusual that a Contractor would actually look at such a small detail (I'm happy when they actually catch the big things) but it turns out that he was in the process of removing an area of concrete that tests determined to be low strength so he was looking at the new concrete in detail and he had already rejected two trucks for low slump.
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