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RE: Low alkali cement[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Low alkali cement
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Tue, 20 Oct 2009 14:23:04 +0000
I have had bad reactive aggregate experiences with interior slabs on ground. Exterior slabs on ground will have water and water vapor serving as a catalyst from below and above. Interior slabs on ground will have water serving as a catalyst from the atmosphere, from wash downs, and from holidays in the vapor barrier (if applicable). It does not take that much water or water vapor to form the reactive paste in the concrete matrix.
Many engineers have been dismissive of interior concrete with reactive aggregate. I am not. I require mitigation for any application with reactive aggregate. Experience has indicted to me that water from these other sources and the relative reactivity of the aggregates are enough to trigger and maintain the formation of the reactive paste unless mitigated in some manner.
There are many cost effective methods of mitigation of reactive aggregate. It does not cost that much to mitigated it. It costs a lot to try to repair it later.
I thought I could skate with not having too many years until I retire. But I observed 18 month old concrete with the classic map cracking in an interior protected space and on a membrane. It does not get more protected than that.
Testing confirmed that we had reactive paste in only 18 months. (The following is read with a loud voice) I then waded in the water and became an ASR believer. We need to CAST OUT the evils of reactive paste! SAVE yourselves from the wickedness of cracked concrete, lawyers, and the law suits that they carry. Embrace the healing mitigation of F ash, lithium, or imported aggregate. .... do I hear an AMEN!
Regards, Harold Sprague
Date: Sun, 18 Oct 2009 23:12:42 -0400
Subject: Re: Low alkali cement
I should have mentioned that the comments on slabs on ground apply only to interior slabs. (I forgot to mention that, because 99.9% of my sogs are interior.)
Does that concur with your experience?
On Mon, Oct 12, 2009 at 3:38 PM, Harold Sprague <spraguehope(--nospam--at)hotmail.com> wrote:
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