bs en 12390-2:2019

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Bs En 12390-2:2019

| Equipment | Requirement | |-----------|-------------| | Moulds | Must be rigid, non-absorbent, and resistant to corrosion. Dimensional tolerance: ±0.5% of nominal size. Internal surfaces must have a roughness depth ≤ 3.2 µm. Moulds showing dents, warping, or wear beyond tolerance must be retired. | | Vibrating table | Frequency: 50 Hz ± 3 Hz; Amplitude: 0.5 mm ± 0.1 mm for cubes (0.8 mm for cylinders). Compliance must be verified annually. | | Compacting bar | Circular cross-section (e.g., 16 mm or 25 mm diameter depending on aggregate size), with a hemispherical tip. Mass and dimensions specified in the standard. | | Curing tank | Must maintain water temperature at 20°C ± 1°C (or ±2°C for lower grades). Water must be saturated with lime (to prevent leaching of calcium hydroxide from specimens). | | Humidity cabinet | For air curing: Must maintain 20°C ± 2°C and ≥95% relative humidity. |

Pro Tip: Many labs fail audits not due to bad technique but due to using moulds that are slightly out of square or have worn internal faces. Regular calibration and measurement of moulds is mandatory.

Based on UKAS laboratory assessment reports and industry experience, here are the top non-conformities related to BS EN 12390-2:2019:

| Mistake | Consequence | How to Avoid | |---------|-------------|---------------| | Using moulds out of tolerance (worn, warped) | Resulting cubes can be oversized (lower strength) or undersized (higher false strength). | Annual mould measurement log. | | Not covering specimens for first 24 hours | Surface drying → lower strength, cracking. | Use rigid plastic lids or cling film immediately. | | Incorrect rodding – too few strokes or bar of wrong diameter | Incomplete compaction → voids and low density. | Use rodding templates and trained operators. | | Water tank temperature not monitored or out of range (e.g., 23°C) | Faster strength gain – false pass for early age, but may also cause weaker late strength. | Continuous temperature logger with alarm. | | Tap water without lime | Surface softening → lower crush results by 5-15%. | Add calcium hydroxide powder to tank water. | | Testing specimens not demoulded flat – rocking on platens | Eccentric loading → variable results. | Check flatness before testing; cap or grind if necessary (per BS EN 12390-3). | bs en 12390-2:2019

BS EN 12390-2:2019 is a crucial standard within the construction materials industry. It specifies the methods for making and curing concrete test specimens (cubes and cylinders) in a laboratory setting. The primary objective is to ensure that the specimens produced are representative of the concrete quality, allowing for accurate determination of compressive strength. It replaced the 2009 version and introduces stricter controls on curing conditions, temperature monitoring, and surface preparation of specimens.

BS EN 12390-2:2019 does not work in isolation. It is part of a family:

| Standard | Title | Role | |----------|-------|------| | BS EN 12390-1 | Shape, dimensions, and tolerances of moulds | Specifies the moulds used in Part 2. | | BS EN 12390-3 | Compressive strength of test specimens | The test method after curing per Part 2. | | BS EN 12390-4 | Determination of compressive strength – non-destructive (rebound hammer) | Optional supplementary. | | BS EN 12350-4 | Fresh concrete – Degree of compactability | Helps determine compaction method for Part 2. | | BS 1881-108 | (Partly superseded) | Old UK standard – still referenced but not current. | Pro Tip: Many labs fail audits not due

For anyone working in concrete testing, keeping the entire BS EN 12390 series on hand is essential.

  • Surface finishing: level and finish specimen surface according to specified method (e.g., strike-off) to avoid entrapment or segregation.
  • Marking: specimens must be marked to identify batch, date, position in mould and orientation where required.
  • Curing:
  • Transportation and handling: prescribe care to avoid damage, restraint of specimens during movement, and maximum permitted times/conditions between casting and testing when relevant.
  • Reporting: specimen details (mould type/dimensions, compaction method, curing regime, dates/times, batch ID) must be recorded and reported with test results.

    • This involves curing the specimens alongside the actual structure (or under simulated site conditions) to estimate the in-situ strength of the concrete. This is often used for determining formwork removal times or post-tensioning schedules.

    Example of a legal link: BS EN 12390-2:2019 is referenced by other UK and European standards, including: Based on UKAS laboratory assessment reports and industry

    Without adherence to BS EN 12390-2:2019, a concrete strength test result is not legally valid under most European and UK construction contracts.

    The method depends on the consistency (slump) of the concrete:

    Critical requirement: Do not over-vibrate. Over-vibration causes aggregate settlement to the bottom and a weak laitance layer on top. Do not under-vibrate—this leaves voids.

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    | Equipment | Requirement | |-----------|-------------| | Moulds | Must be rigid, non-absorbent, and resistant to corrosion. Dimensional tolerance: ±0.5% of nominal size. Internal surfaces must have a roughness depth ≤ 3.2 µm. Moulds showing dents, warping, or wear beyond tolerance must be retired. | | Vibrating table | Frequency: 50 Hz ± 3 Hz; Amplitude: 0.5 mm ± 0.1 mm for cubes (0.8 mm for cylinders). Compliance must be verified annually. | | Compacting bar | Circular cross-section (e.g., 16 mm or 25 mm diameter depending on aggregate size), with a hemispherical tip. Mass and dimensions specified in the standard. | | Curing tank | Must maintain water temperature at 20°C ± 1°C (or ±2°C for lower grades). Water must be saturated with lime (to prevent leaching of calcium hydroxide from specimens). | | Humidity cabinet | For air curing: Must maintain 20°C ± 2°C and ≥95% relative humidity. |

    Pro Tip: Many labs fail audits not due to bad technique but due to using moulds that are slightly out of square or have worn internal faces. Regular calibration and measurement of moulds is mandatory.

    Based on UKAS laboratory assessment reports and industry experience, here are the top non-conformities related to BS EN 12390-2:2019:

    | Mistake | Consequence | How to Avoid | |---------|-------------|---------------| | Using moulds out of tolerance (worn, warped) | Resulting cubes can be oversized (lower strength) or undersized (higher false strength). | Annual mould measurement log. | | Not covering specimens for first 24 hours | Surface drying → lower strength, cracking. | Use rigid plastic lids or cling film immediately. | | Incorrect rodding – too few strokes or bar of wrong diameter | Incomplete compaction → voids and low density. | Use rodding templates and trained operators. | | Water tank temperature not monitored or out of range (e.g., 23°C) | Faster strength gain – false pass for early age, but may also cause weaker late strength. | Continuous temperature logger with alarm. | | Tap water without lime | Surface softening → lower crush results by 5-15%. | Add calcium hydroxide powder to tank water. | | Testing specimens not demoulded flat – rocking on platens | Eccentric loading → variable results. | Check flatness before testing; cap or grind if necessary (per BS EN 12390-3). |

    BS EN 12390-2:2019 is a crucial standard within the construction materials industry. It specifies the methods for making and curing concrete test specimens (cubes and cylinders) in a laboratory setting. The primary objective is to ensure that the specimens produced are representative of the concrete quality, allowing for accurate determination of compressive strength. It replaced the 2009 version and introduces stricter controls on curing conditions, temperature monitoring, and surface preparation of specimens.

    BS EN 12390-2:2019 does not work in isolation. It is part of a family:

    | Standard | Title | Role | |----------|-------|------| | BS EN 12390-1 | Shape, dimensions, and tolerances of moulds | Specifies the moulds used in Part 2. | | BS EN 12390-3 | Compressive strength of test specimens | The test method after curing per Part 2. | | BS EN 12390-4 | Determination of compressive strength – non-destructive (rebound hammer) | Optional supplementary. | | BS EN 12350-4 | Fresh concrete – Degree of compactability | Helps determine compaction method for Part 2. | | BS 1881-108 | (Partly superseded) | Old UK standard – still referenced but not current. |

    For anyone working in concrete testing, keeping the entire BS EN 12390 series on hand is essential.

  • Surface finishing: level and finish specimen surface according to specified method (e.g., strike-off) to avoid entrapment or segregation.
  • Marking: specimens must be marked to identify batch, date, position in mould and orientation where required.
  • Curing:
  • Transportation and handling: prescribe care to avoid damage, restraint of specimens during movement, and maximum permitted times/conditions between casting and testing when relevant.
  • Reporting: specimen details (mould type/dimensions, compaction method, curing regime, dates/times, batch ID) must be recorded and reported with test results.

    • This involves curing the specimens alongside the actual structure (or under simulated site conditions) to estimate the in-situ strength of the concrete. This is often used for determining formwork removal times or post-tensioning schedules.

    Example of a legal link: BS EN 12390-2:2019 is referenced by other UK and European standards, including:

    Without adherence to BS EN 12390-2:2019, a concrete strength test result is not legally valid under most European and UK construction contracts.

    The method depends on the consistency (slump) of the concrete:

    Critical requirement: Do not over-vibrate. Over-vibration causes aggregate settlement to the bottom and a weak laitance layer on top. Do not under-vibrate—this leaves voids.