Usually the Con-Cure system shows in-place strength to be substantially higher than field cured cylinder breaks indicate. But during a cold week in January that was not the case. Soon after the concrete was placed it was subject to a cold steady rain that lasted for three days. On the third day the testing lab called with the breaks. Given that the cylinders have been well protected from the cold, the breaks were substantially higher than the in-place strength as recorded by the Con-Cure system. With that data, the contractor postponed stressing PT for two days and avoided a dangerous situation.