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RE: Concrete Slump[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Concrete Slump
- From: "Donald Bruckman" <bruckmandesign(--nospam--at)verizon.net>
- Date: Fri, 16 Feb 2007 10:27:18 -0800
I hope this isn’t taken the wrong way, but…
In my experience, there are two causes of concrete cracks: from bad installation and from bad design.
We spend a ton of time discussing how to construct concrete in ways to eliminate, (note I didn’t say “limit”) cracking. Low and behold, perfect concrete is attainable, but only if you understand what you are doing and have an engineer designing it for you that gives the field the chance to succeed.
That said, I am a firm believer that the contractor, and stunningly, from concrete subs no less, that repeat the old saying, “There are two kinds of concrete, concrete that is cracked and concrete that is going to crack.” Those are the ones that don’t understand concrete. But, in addition, it takes a savvy engineer to fully understand what concrete will do and where it will go in-situ.
I have been privileged to work with a few that truly “got it” about concrete and we in the field bowed in awe and blathered, “…we’re not worthy, we’re not worthy…” to their consummate expertise, because for many of us, myself included, it was an eye-opening experience to actually get it into your head that perfect concrete is, in fact, attainable if you pay very close attention.
From: The Best Always [mailto:the_best_always(--nospam--at)yahoo.com]
Thanks Jay. I appreciate your response to my inquiry.
The reason that I asked is that I suspect that the slump that the contractor uses cause the excessive cracks I have observed. The slump that they use is reaching as high as 200mm (with concrete additives). Also, I do not like the way they repair these cracks on floor slabs; they do not use injection equipment as per product data. Crack widths are 0.4mm on top and soffit of slabs; these are found to be through cracks by flooding the area with water. I see no evidence that the repair material fills these cracks completely.
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