We are required to maintain the concrete temperature of a slab at no lower than 50 degrees F during the curing period. We expect to take care of this by curing blankets, but how can we be sure we have enough covering if we get an unexpected drastic drop in temperature?
Use a pocket thermometer. This can first be inserted momentarily in inconspicuous locations to create several wells before the concrete has hardened. Later the thermometer can be inserted at any time to monitor the temperature of the concrete. Steel thermometers with dials are available from concrete testing supply houses. Owners of such thermometers find many uses for them in monitoring temperatures of fresh or hardened concrete in both cold and hot weather.