Good day - Any experience with concrete placement at temperatures in the 20F to 40F range without use of heat? Some manufacturers admixtures are advertised to protect the concrete down to 20F. Ever the skeptics, we are seeking input from unbiased, experienced sources. Situation is lightweight concrete on metal deck, 16 story building. Currently using heaters, tarps, and moisture control with apparent, albeit costly, success. ACI 306 is our bible. Specifically the question is, have you had success using an accelerating admixture and placing concrete without use of heat at temperatures approaching 20F? If so, did you implement any other procedures to help ensure success? And finally, was there any discernible loss of strength evident in the test cylinder breaks? Thanks in advance for any feedback.
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