Bs En 12390-2:2019 [work] → 【SIMPLE】

Accurate specimen preparation requires standardized tools. The standard specifies requirements for the following equipment:

Once removed from the moulds (demoulded), the specimens must be cured in a controlled environment to ensure maximum strength development.

Many laboratories are now using digital barcode tracking linked to temperature sensors to automate compliance with the 2019 version.

This is used to assess whether the concrete delivered to site meets the specified strength requirements. The specimens are cured under idealized, standardized conditions (temperature and humidity) to eliminate external variables. The goal is to test the potential quality of the concrete mix, not the actual in-situ strength. bs en 12390-2:2019

. By standardizing how test cubes, cylinders, and prisms are handled, it ensures that the physical properties of the hardened concrete are measured accurately and consistently across different construction projects. Scope and Purpose

After casting, specimens must be protected from evaporation, shock, and extreme temperatures. For the first 24 hours (the initial curing period), the standard recommends storing the moulded specimens at a temperature of 20°C ± 5°C and near 100% relative humidity, often achieved by covering with plastic sheeting or damp mats.

. The specimens must remain visibly wet at all times; a dry surface means moisture is evaporating, which halts cement hydration. Summary of Key Compliance Tolerances Standard Requirement (BS EN 12390-2:2019) in hot climates) Time Before Demolding 16 hours minimum to 72 hours maximum Permanent Curing Temp Moisture Room Humidity relative humidity 6. Common Site Errors and How to Avoid Them Accurate specimen preparation requires standardized tools

: After compaction, the top surface is leveled using a float or trowel to ensure a flat, smooth surface for testing. 3. Standard Curing Requirements

The standard BS EN 12390-2:2019 covers the procedures for making and curing specimens of hardened concrete for testing. The standard is applicable to concrete made with normal weight aggregates, lightweight aggregates, and heavyweight aggregates. The standard provides guidelines for:

These can include internal (poker) vibrators, vibrating tables, or manual compacting rods/bars. Trowels/Floats: Used for mandatory surface leveling. 3. Procedural Methodology Specimen Preparation and Filling This is used to assess whether the concrete

Specifies curing procedures for laboratory and field conditions. 1. Preparing and Casting Specimens

: Specimens must remain in their molds for at least 16 hours but no more than three days at a temperature of

Methods include using a vibrating table or a poker vibrator to ensure the concrete density is representative of the structure.