I have to pour outdoor concrete next week. The pour is in two main parts - a 100 mm cover / 2nd pour over a 6 x 3 m area of existing concrete from a 1st rough pour, and the bottom stub part of a retaining concrete wall profile about 500 mm wide x 750 mm high x 4 m long.
Unfortunately the weather outlook is quite cold, getting up to 6-8°C (43-46°F) late next week daytime, but generally otherwise around 2-4°C (36-41°F) in daytime, which is below the 5°C minimum for concrete. The concrete can be poured in the morning so it'll have about 6 hours of daylight to start setting, but nights are forecast to be cold - close to zero (0 - 1°C / 32-34°F). Both are exposed outdoor pours, there isn't an issue with wind or rain, just temperature.
I can't really afford to put off the pour (previous pour date didn't happen for unrelated reasons) especially with no guarantee that the week after (or the one after that) will be any better,but I do have several days to prepare, if preparations are needed to ensure success.
If nothing else comes up, I might have the capability, as a last resort, of "tenting" the entire poured areas under a lightweight wood frame overlaid with heavy polythene (DPM) and running some air /space heaters under it for a couple of days before or after, if there isn't a better option. But that's only a layperson's guess.
What are my options for ensuring the concrete sets properly despite the forecast low temperatures?