USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
(OP)
I know that some research has been done by Michael O'Neil regarding the use of self-consolidating concrete in drilled shafts.
My question is whether somebody knows about the use of SCC in Augered Cast-in-Place piles.
My question is whether somebody knows about the use of SCC in Augered Cast-in-Place piles.





RE: USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
RE: USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
RE: USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
RE: USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
I assume you will excavate the pile using bentonite or polymer as excavation support. Then you will lower the reinforcing steel cage into the excavation. You would then use a tremie to concrete from the base up displacing the bentonite/polymer as you go. The concrete would normally have a slump of 200-250mm.
I've never seen reinforcing steel lowered into a structure after concreting - sounds risky.
RE: USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
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http://s67
RE: USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES
My experience of free-fall is it's ok at ANY depth. It doesn't segregate, but separates into blobs. On impact there is a terrific vibration effect. Full-length cores of the piles show good quality concrete. I have done cores on 3 jobs to convince the client's engineer.
Normal slump (80mm) needs vibration. 110 mm does not, except for the top few metres, where the impact effect is less.
A slump of 220 mm is self-compacting, if the mix is good. It must not be vibrated, or the coarse aggregate settles out.
Consulting engineers can take a lot to convince them it's ok. Of course the stream of concrete should be centralised. Best done by a good operator with a shovel. You listen for the "plop plop" sound as it hits the bottom. However a funnel with a 500mm tube sitting central in the reo cage is ok too. It's more trouble, needs a crane, but the consulting engineer is more likely to approve the method.