TS EN 934-2

TS EN 934-2 is the part of the admixtures for concrete, mortar and grout series that focuses on concrete admixtures: their definitions, core requirements, conformity, marking and labelling. It addresses admixtures used in site-mixed, ready-mixed and precast concrete, including plain, reinforced and prestressed concrete, so the same product family can be understood consistently across different concrete production and use conditions.

In general technical terms, chemical admixtures are ingredients added to concrete in small proportions to modify the behaviour of fresh concrete and, in some cases, the properties of hardened concrete. They may be used to influence workability, water demand, setting behaviour or other practical performance aspects. The standard’s value lies in separating terminology from expectation: a product is not judged only by its commercial name, but by how it is defined, classified and documented for use in concrete.

Why the terminology and requirements matter

Concrete admixtures are a broad technical field, and different admixture types serve different purposes. A water-reducing admixture, an accelerator or an air-entraining admixture may all be intended to improve concrete performance, yet they act through different mechanisms and are selected for different site or production needs. By combining definitions with requirements and conformity-related provisions, this part of EN 934 helps users interpret product claims in a more structured way.

What this part covers in practice

• Concrete admixtures within the broader admixtures for concrete, mortar and grout family.
• Use in site-mixed, ready-mixed and precast concrete.
• Applications in plain, reinforced and prestressed concrete.
• Conformity, marking and labelling as part of the document’s technical framework.
• Coordination with related reference standards for testing and performance evaluation.