SIST EN 772-2:1999

Overview

EN 772-2:1998 - Methods of test for masonry units, Part 2 - specifies a standardized procedure for determining the percentage area of voids in aggregate concrete masonry units using the paper indentation technique. Published by CEN and adopted by national bodies (for example as SIST EN 772-2:1999), this European Standard provides a repeatable approach for quantifying open void area in concrete blocks and other aggregate concrete masonry units.

Key Topics and Requirements

• Scope: Applies to aggregate concrete masonry units where the percentage area of voids is a relevant quality parameter.
• Test principle: Uses a paper indentation method to obtain a two‑dimensional imprint of the unit’s void pattern; the imprint is then used to determine void area as a percentage of the unit’s face area.
• Sample handling: Requires representative samples and defined preparation to ensure consistent imprints (clean, undamaged faces).
• Measurement and calculation: Specifies how to derive the area of voids from the imprint and calculate the percentage area of voids relative to the unit face.
• Reporting: Calls for clear reporting of test conditions, sample identification, measurement method, and results to ensure traceability and comparability.
• Limitations: Intended for aggregate concrete masonry units and for two‑dimensional area assessment; it does not directly measure internal porosity or three‑dimensional pore volume.

Applications

• Quality control in manufacturing of concrete masonry units: monitor consistency of block core/void patterns that affect weight, thermal properties, and material usage.
• Design and specification verification: help specifiers and contractors confirm that units meet project or regulatory requirements relating to void area.
• Comparative testing: provide a standardized basis for comparing products from different batches or suppliers.
• Research and product development: support evaluation of new mixes, block geometries, or production processes with respect to void distribution.

Who Should Use This Standard

• Masonry unit manufacturers and production quality teams
• Construction materials testing laboratories
• Structural and masonry engineers specifying or verifying block properties
• Building inspectors and regulatory authorities assessing compliance

Related Standards

• Other parts of the EN 772 series (methods of test for masonry units)
• National adoptions and translations (e.g., SIST EN 772-2:1999)

Keywords: EN 772-2:1998, methods of test for masonry units, percentage area of voids, aggregate concrete masonry units, paper indentation, masonry testing, CEN, concrete block quality control.