A central innovation in the 2019 revision is the heightened emphasis on proper compaction. The standard prescribes two methods: internal vibration (using a needle vibrator) or hand layering (using a tamping bar). For each method, specific rules apply—for example, when using a vibrator, the number of insertion points and the duration are defined to avoid segregation or entrapment of air. The 2019 edition clarifies the depth of vibrator penetration and the need to avoid over-vibration, which can cause aggregate settlement and weaken the top surface.
This standard applies to concrete tested under laboratory conditions, specifically for: bs en 12390-2:2019
The top surface must be finished flat to ensure even loading during testing. 3. Initial Curing and Demolding Timeframe: Specimens typically remain in the mold for Environment: They must be kept at a temperature of 15∘C15 raised to the composed with power C 22∘C22 raised to the composed with power C 20∘C20 raised to the composed with power C A central innovation in the 2019 revision is
For anyone working in concrete testing, keeping the entire on hand is essential. The 2019 edition clarifies the depth of vibrator