How to retain test blocks for concrete with frost resistance requirements (F 150)?

In fact, the frost resistance is not shown on the test block. If you are a contractor, the commodity mixing station is required to keep one more set of test blocks for testing the strength value for 7 days. If it is self-mixed, you can leave 1-2 groups of test blocks to test the strength of formwork removal, and it is best to send the test blocks without antifreeze for inspection, because the concrete will be degraded after adding antifreeze.

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