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Calcium Chloride accelerator

Calcium Chloride accelerator

Calcium Chloride accelerator

(OP)
Typically we do not allow calcium chlorides in concrete as an accelerator - but on a recent project I was asked if they could use it (vs. a "non-corrosive" accelerator) since the slab was not reinforced with ferrous materials - used synthetic fibers.

I thought that there were other adverse effects on concrete beyond causing wire mesh or rebar to rust but I'm not sure I can recall.

Any thoughts on the use of calcium chlorides in concrete?

 

RE: Calcium Chloride accelerator

What about anchorages, embeds, steel studs in contact, etc.?  Every slab has some steel accessories which could be subject to accelerated corrosion due to chloride exposure.

RE: Calcium Chloride accelerator

Yup...what TX said!

RE: Calcium Chloride accelerator

(OP)
That's what I thought.  I mentioned to the contractor that we still needed to shoot in the interior stud walls and that would be problematic with chlorides in there.

 

RE: Calcium Chloride accelerator

Why would anyone use chloride accelerators with the non-chloride options?

RE: Calcium Chloride accelerator

(OP)
He indicated that the chloride option was $3/cu. yd. while the non-chloride option was $9/cu.yd.    

RE: Calcium Chloride accelerator

I only ever permit CaCl2 for temporary structures...

Dik

RE: Calcium Chloride accelerator

JAE:

Wish we could get concrete that cheap here, even with the CC!

Mike McCann
MMC Engineering

 

RE: Calcium Chloride accelerator

Why are calcium chloride accelerators still available?  Having them in the plant means they may be used inappropriately...also, the synthetic fibres are just a marketing ploy.

RE: Calcium Chloride accelerator

Hokie... because they're cheap and they work well and have a long history of application.

They also have a few problems, too...

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