Tried a magnesium-based accelerator on a cold pour last Thursday in Billings

I had a 12-yard slab to finish and the temp was dropping fast, so I tossed in some magnesium accelerator instead of calcium. The set time was way more predictable and I didn't get that weird brown discoloration I usually see with calcium. My finisher buddy said I was crazy for switching, but the surface came out smoother with less trowel burn. Has anyone else had luck with magnesium over calcium on cooler pours?

2 comments

2 Comments

adams8212d ago

Also magnesium won't spike the corrosion risk on rebar like calcium does long term.

grant56912d ago

@adams82 I always figured calcium was fine, but that rebar point made me rethink it.