When is the latest time to record concrete fragments?

Four hours. Concrete chips can't be recorded for a long time, because concrete will be strong after a long time, and the best time is 1-4 hours. Concrete chip refers to the FRID chip implanted in the concrete of affordable housing. The concrete implant chip is a remote monitoring system for concrete mixing, which is a patent invented by Jian Yue Sanhe Software Co., Ltd. ..