TS EN 934-3/AC

TS EN 934-3/AC is the correction text for EN 934-3:2003, which addresses chemical admixtures for cement-based masonry mortar. This record is linked to the part of the standard dealing with conformity criteria, required properties, and marking and labelling for masonry mortar admixtures; as an AC document, its role is to reflect a specific technical correction to the base text rather than to stand as a full standalone technical specification.

In general technical terms, chemical admixtures are ingredients added in small quantities to modify mortar behaviour, such as workability, water retention, air content, setting behaviour, or strength development. In masonry mortars, these admixtures are used to help produce a mortar compatible with bricks, blocks, or stone units, while the exact dosage and performance depend on the cementitious mortar system and the intended application.

Core concepts behind masonry mortar admixtures

• Conformity criteria are used to judge whether a product meets its declared performance.
• Requirements define the properties an admixture is expected to satisfy.
• Definitions and terminology distinguish masonry mortar admixtures from admixtures intended for concrete or grout.
• Marking and labelling support clear product identification and user information.

The focus of this standard is the classification and conformity framework for admixtures used in masonry mortar, not a blanket rule for all mortar or concrete admixtures. For technical evaluation and procurement, it helps clarify which mortar type the product is intended for and the basic performance claims under which it is described.