BS EN 12390-2:2019 pdf free.Testing hardened concrete.
6.2.2.2 Compacting with vibrating table Apply the vibration for the minimum duration necessary to achieve full compaction of the concrete. The mould should preferably be attached to, or firmly held against the table. Avoid over-vibration, which may cause loss of entrained air. 6.2.3 Compacting by hand with compacting rod or bar Distribute the strokes of the compacting rod, or bar, in a uniform manner over the cross-section of the mould. Ensure that the compacting rod, or bar, does not forcibly strike the bottom of the mould
when compacting the first layer, nor penetrate significantly any previous layer. Subject the concrete to a sufficient number of strokes per layer, typically 25 for concretes having a consistence equivalent to slump classes S1 and S2 according to EN 206, in order to remove pockets of entrapped air but not the entrained air. After compaction of each layer, tap the sides of the mould smartly with the mallet until large bubbles of air cease to appear on the surface and depressions left by the compacting rod or bar, are removed.6.5.1 At the place of storage, leave the test specimens in the mould for at least 16 h, but not longer than 3 days, at a temperature of(20土5)。C (or (25士土5)。C in hot climates), protected against shock, vibration and dehydration. NOTE As long as the concrete remains capable of being remixed, test specimens can be transported from the place of manufacture to the place of storage provided they are protected against dehydration. If necessary, removal from the mould may be done before 16 h in special cases e.g. rapid hardening concrete, early testing. . 6.5.2 After removal from the mould, cure the test specimens until tested in accordance with the procedure given in the relevant standard, in water at a temperature of (20土2)。C, or in chamber at (20士土2] °C and relative humidity≥95 %.BS EN 12390-2 pdf download.