BS EN 12350-4:2019 pdf free.Testing fresh concrete.
4 Principle Carefully place the fresh concrete in a compaction container using a trowel, avoiding any compaction of the concrete. When the compaction container is full, the top surface is struck off level with the top of the compaction container. The concrete is compacted by vibration and the distance from the surface of the compacted concrete to the upper edge of the compaction container is used to determine the degree of compactability. 5 Apparatus 5.1 Common apparatus for fresh concrete testing The apparatus listed below for the execution of this test method shall be in accordance with the specification given EN 12350-1 and as specified below; 5.1.1 Compaction container, made of metal not readily attacked by cement paste. The internal dimensions of the compaction container shall be: — base: (200 ± 2) mm x (200 ± 2) mm; — height: (400 ± 2) mm. The thickness of the base and walls shall be at least 1,5 mm. The bottom of the compaction container may be perforated to facilitate emptying. A suitable plastic plate to cover the bottom has then to be placed inside the compaction container.5.1.3 Means of compacting the concrete, which shall be one of the following: 一internal vibrator; -vibrating table. The use of a vibrating table shall be the reference method. 5.1.4 Remixing container or tray. 5.1.5 Shovel. 5.1.6 Straight edged scraper, more than 200 mm in length. 5.1.7 Rule. 5.1.8 Moist cloth. 6 Sampling ; The sample shall be obtained in accordance with EN 12350-1. The sample shall be re-mixed using the remixing container or tray and the shovel or scoop before carrying out the test. Alternative sampling procedures may be given in provisions valid in the place of use of the concrete.7 Procedure Clean the compaction container and moisten the inner surfaces using a moist cloth. Fill the compaction container, without tamping it, by tilting the trowel sideways from each of all four upper edges of the compaction container in turn. When the compaction container is filled, remove all concrete above the upper edges, using the straight edged scraper with a sawing action, in such a way as to avoid any compacting effect. Compact the concrete by means of a vibrating table or by the use of an internal vibrator, until no further reduction in volume is determinable. During compaction avoid loss of concrete through splashing, or leakage. Great care is recommended if loss of entrained air is to be avoided when using an internal vibrator.BS EN 12350-4 pdf download.