Jd, I don't quite get what you are saying...
Scc has plasticisors and it should have capilaries since it.does still dry even if with less water.
A concrete poured with a high water content will contain large voids when it begins to dry. That's why poor concrete is more porous than good, well compacted, low W/C ratio concrete.
The flooring industry recommends that the water/cement ratio not to exceed 0.50. ASTM F710 States the w/c ratio to be between 0.40 and 0.45. The average in the US is 0.58 what I consider crapcrete.
I had a slab I worked on that was poured with a very high ratio, I'd have to get the old papers out to see how high it was, but it was wet, like .65 or more.
It dried really quickly, much faster than any of us figured it would. Then we thought perhaps it was all the voids that helped it dry. There may be something to that, but the concrete was pretty weak. Good enough for a floor slab though.
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12-15-2011, 12:59 AM
(This post was last modified: 12-15-2011, 01:11 AM by foxgeorge.)
Self-compacting concrete is a concrete mixture that is able to consolidate under its own weight. The highly fluid nature of it makes suitable for placing in difficult conditions and congested reinforcement. Use of it can also help minimize hearing-related damages on the worksite that are induced by vibration of concrete. Another advantage of Self-compacting concrete is that the time required to place large sections is considerably reduced. Self-consolidating concrete is a highly flowable, non-segregating concrete. It can be used casting heavily reinforced sections. The required level of fluidity is greatly influenced by the particular application under consideration. Obviously the most congested structural members demand the highest fluidity.
Hi foxgeorge, glad to have you!
So when you use a self consolidating concrete there must be a stricter limit on the height of each pour. How long does the concrete take before it can support its own weight and then another lift above?
walked into a job today with 10" Cast in Place on Grade and Suspended
the concrete contractor told me they used Super P - there are a bunch of what looks like stress cracks throughout the slab - he told me that's common with this product - hoping you could shed some insight