Bs En 12390-2:2019 'link' -

: Once demolded, specimens are typically cured in a water tank at

The primary objective is to create a standardized environment. By controlling temperature, humidity, and handling, the standard ensures that the strength measured in the lab provides a reliable basis for the acceptance of the concrete batch.

The standard provides a detailed, step-by-step guide to the entire specimen preparation process, including:

) and protected from moisture loss by covering them with plastic or wet burlap.

Specifies curing procedures for laboratory and field conditions. 1. Preparing and Casting Specimens bs en 12390-2:2019

This article provides an informative overview of the standard, its scope, and the key technical requirements for industry professionals.

BS EN 12390-2:2019 provides the definitive framework for the preparation of concrete test specimens. Its strict requirements for temperature control and curing duration ensure that the construction industry has reliable data on concrete performance. Non-compliance with this standard typically results in invalid strength tests, posing significant risks to construction projects.

Clearer documentation and report requirements to ensure complete traceability. 2. Key Equipment Requirements

Specimens must be cast in molds that comply with . Molds should be: Non-reactive: Materials must not affect the concrete. : Once demolded, specimens are typically cured in

is the definitive British and European standard for making and curing concrete test specimens. Published by the British Standards Institution (BSI) , it ensures that cubes, cylinders, and prisms are prepared consistently so that strength tests—such as compressive and flexural strength—accurately reflect the concrete's quality. 🏗️ Core Purpose of the Standard

If concrete test cubes are left unprotected on a hot or freezing job site over the weekend before being taken to the lab, their 28-day strength can drop by up to 20–30%. When the lab crushes those cubes, the results will fail specification limits, triggering a costly chain reaction: halting work on-site, ordering expensive non-destructive testing (NDT) like Schmidt hammer or ultrasonic pulse velocity tests, or extracting core samples from the actual structure.

BS EN 12390-2:2019 is part of a larger multi-part standard ( BS EN 12390: Testing hardened concrete ) used extensively across the United Kingdom and Europe. Specifically, Part 2 dictates the standardized methodologies for casting and curing specimens—such as cubes, cylinders, and prisms—taken from fresh concrete on-site or in a laboratory. Why the 2019 Version Matters

BS EN 12390-2 is part of a series. It is typically used in conjunction with: BS EN 12390-2:2019 provides the definitive framework for

Enhanced documentation requirements regarding the tracking of curing history. Testing and Documentation

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

Failing to follow BS EN 12390-2:2019 usually results in a penalty on the apparent strength of the concrete. Keep an eye out for these frequent mistakes:

Apply vibration using a table or poker until the surface becomes relatively smooth and no large air bubbles emerge. Avoid over-vibration, which causes segregation.

Use a standard compacting rod or bar. Distribute the strokes uniformly across the cross-section of the mold. The standard dictates a minimum number of strokes per layer (typically 25 strokes for standard cubes) to ensure adequate density. 4. Finishing the Surface