Self Consolidating Concrete
Self Consolidating Concrete
(OP)
1. Does self consolidating concrete have more shrinkage than a regular mix of the same strength and w/cm ratio?
2. Is self consolidating concrete available in CSA Exposure classification C-1; that is with a w/cm=0.40 and resistance to chloride penetration (56 day rapid chloride permeability in index of not greater than 1500 coulombs) and freeze-thaw resistance?
3. Is self consolidating concrete available in CSA Exposure classification F-1?
4. If I specify stainless steel rebar, is it sufficient to specify concrete that has freeze-thaw resistance (i.e. F-1) but not the degree of chloride resistance required by CSA C-1? It seems to me that with stainless steel rebar, that F-1 should suffice. The reason for the rebar is that I am extending an existing step tread from 11.5" to 14.25" and to do this I am doweling the 2.75" wide extension piece into the vertical face of the existing concrete riser. Note that this is in the exterior concrete landscape walkway so the width of the 2.75" wide extension is 30 feet to match the existing walkway and step. The rebar is to control crack width in the new 2.75" wide x 30 foot long piece of concrete.
2. Is self consolidating concrete available in CSA Exposure classification C-1; that is with a w/cm=0.40 and resistance to chloride penetration (56 day rapid chloride permeability in index of not greater than 1500 coulombs) and freeze-thaw resistance?
3. Is self consolidating concrete available in CSA Exposure classification F-1?
4. If I specify stainless steel rebar, is it sufficient to specify concrete that has freeze-thaw resistance (i.e. F-1) but not the degree of chloride resistance required by CSA C-1? It seems to me that with stainless steel rebar, that F-1 should suffice. The reason for the rebar is that I am extending an existing step tread from 11.5" to 14.25" and to do this I am doweling the 2.75" wide extension piece into the vertical face of the existing concrete riser. Note that this is in the exterior concrete landscape walkway so the width of the 2.75" wide extension is 30 feet to match the existing walkway and step. The rebar is to control crack width in the new 2.75" wide x 30 foot long piece of concrete.






RE: Self Consolidating Concrete
Maine Professional and Structural Engineer.
(Just passed the 16-hour SE exam, woohoo!)
RE: Self Consolidating Concrete
RE: Self Consolidating Concrete
Might be useful to link it here so that others don't rehash the same issues and stick to your self consolidating concrete questions.
1. No idea, the local redi-mix supplier is better capable of answering that.
2. See above
3. Same
4. The way it has been explained to me the chloride can have a impact (albeit small) on the molecular structure of the concrete. So if C-1 concrete is available that's what I would be using. I'd also be extremely concerned about water freezing in the cold joint. But as I said this has been hashed out before I believe in an earlier thread.
Why do you need self consolidating? It the contractor too lazy to run a vibrator while he's filling the form and finishing the top? That way you could get the concrete you want without worrying about self consolidation.
RE: Self Consolidating Concrete
RE: Self Consolidating Concrete
RE: Self Consolidating Concrete