There are many ways to keep the test block. It can be retained by position or by machine-team, depending on whether the concrete used in civil air defense engineering and ordinary civil engineering is the same batch or grade. Now it is required to retain the test block at the pouring site. If you are not in a construction site, even the concrete with the same label and mix ratio on the same day, I suggest that it should be kept separately. This is beneficial to the control of construction quality, the filing of engineering data and the evaluation of the strength of sub-projects The number of lien can be determined according to the actual needs of the project, generally one shift or part, and at least two groups of standard curing test blocks. If you need to keep in good health under the same conditions, you need to leave it alone.