Bs En 12390-2:2019

: Updated references to common apparatus and specifications found in EN 12350-1 .

The section on curing is almost obsessive about environmental control, which is interesting from a biological perspective. bs en 12390-2:2019

Every great structure starts as a wet, grey mixture. To make sure that mixture won't crumble under the weight of a hundred floors, engineers need to test it. But you can't just slap some concrete into a bucket and hope for the best. You need a standardized way to create "test specimens"—usually small cubes or cylinders—that represent the giant slabs of the real building. The Three Golden Rules of the Standard : Updated references to common apparatus and specifications

: Specimens must be filled in layers. Compaction is achieved through mechanical vibration (using a vibrating table or internal "poker" vibrator) or manually using a compacting rod or bar. For manual compaction, each layer typically receives 25 strokes to remove entrapped air pockets. To make sure that mixture won't crumble under