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I have no personal experience, myself. Living in Minnesota, the topic does come up. ;) I hear a lot of folks who used CC in the mix regret it years later. Mostly it works, but sometimes it does not. Seems like a person is rolling the dice. Highway contractor ran months behind on the highway pavement a mile from me. The 8 mile section they layed in November, said in the paper it will be just fine, they use special chemicals that freezing won't bother it. The other 15 miles they laid the next summer. Took 5 years, the stuff they laid in Novemer is all cracked & crazed. Ten years, & they are mapping & discussing (who's responsible/ who pays?) & overlaying tar - 1/2 mile section was so bad the tore it out & layed all tar.The summer poured section is holding up well - same materials, same company did both sections. No official pronouncement, but 'everybody' talking off the record is saying it was laid too cold & the chemical made the concrete weak. Concrete gives off a lot of heat when it cures. If you are pouring a big thick chunk, temps down to 20 degrees will be just fine, if: the ground is not frozen; you cover it with insulation as others say; will it warm up to above freezing during the day & only freeze over night? Curing concrete will throw enough heat to keep itself warm over night f it has a chance during the day to warm again. If this is a thin 4" ribbon that chills through faster than it can heat, then I'd think long & hard. I personally would not use the antifreeze stuff in concrete in my projects based on what I have heard locally. I'd figure out insulation or wait until spring. This is stuff that should last 20-50 years, one mistake now and you have decades of junk. --->Paul
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