SIST EN 772-21:2011

Methods of test for masonry units - Part 21: Determination of water absorption of clay and calcium silicate masonry units by cold water absorption

This European Standard specifies a method of determining the water absorption of clay and calcium silicate masonry units by immersing them in cold water.

Prüfverfahren für Mauersteine - Teil 21: Bestimmung der Kaltwasseraufnahme von Mauerziegeln und Kalksandsteinen

Diese Europäische Norm legt ein Verfahren zur Bestimmung der Wasseraufnahme von Mauerziegeln und
Kalksandsteinen durch ein Kaltwasser-Eintauchverfahren fest.

Méthodes d'essai des éléments de maçonnerie - Partie 21: Détermination de l'absorption d'eau des éléments de maçonnerie en terre cuite et en silico-calcaire par absorption d'eau froide

La présente Norme européenne spécifie une méthode permettant de déterminer l'absorption d'eau des
éléments de maçonnerie en terre cuite et en silico-calcaire en les immergeant dans l'eau froide.

Metode preskušanja zidakov - 21. del: Ugotavljanje vpijanja hladne vode opečnih in apneno peščenih zidakov

Ta evropski standard določa metodo za ugotavljanje vpijanja hladne vode opečnih in apneno peščenih zidakov s potapljanjem v hladno vodo.

General Information

• Status: Published
• Public Enquiry End Date: 14-Nov-2010
• Publication Date: 16-Jun-2011
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: CAA - Mineral binders and masonry
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-May-2011
• Due Date: 04-Aug-2011
• Completion Date: 17-Jun-2011
• Ref Project: EN 772-21:2011 - Methods of test for masonry units - Part 21: Determination of water absorption of clay and calcium silicate masonry units by cold water absorption

Overview

SIST EN 772-21:2011 is a European Standard developed by the European Committee for Standardization (CEN) that defines a precise method for determining the water absorption of masonry units made from clay and calcium silicate. This standard involves immersing masonry units in cold water and measuring the increase in mass due to water absorption. Accurate determination of water absorption is critical to assessing the durability, quality, and performance of masonry materials in construction projects.

The scope of this standard covers both clay bricks and calcium silicate masonry units, providing a consistent and reliable test procedure to evaluate their water uptake properties. It is essential for manufacturers, testing laboratories, and building engineers to ensure compliance with material specifications and construction standards.

Key Topics

• Purpose: To measure the water absorption capacity of clay and calcium silicate masonry units by cold water immersion.
• Test Principle: After drying the masonry units to a constant mass, specimens are immersed in cold water for a specified time-24 hours for clay units and 48 hours for calcium silicate units. The percentage increase in mass indicates water absorption.
• Sampling Requirements: A minimum of six test specimens must be sampled according to relevant parts of EN 771 (clay or calcium silicate masonry units).
• Drying Conditions: Specimens are dried in a ventilated oven at 105 °C ± 5 °C until constant mass is achieved, defined as less than 0.2% mass loss between two weighings at least 24 hours apart.
• Test Procedure:
  • Immerse masonry units fully in water.
  • Maintain immersion for the required duration.
  • Remove surface water without drying the specimen.
  • Weigh the soaked specimen as soon as possible.
• Calculation: Water absorption, expressed as a percentage, is calculated using the formula:
  W = ((Ms - Md) / Md) × 100%
  where Ms is the soaked mass and Md is the dry mass.
• Reporting: Test reports must include specimen details, test conditions, dry and soaked masses, soaking period, water absorption values, and any relevant remarks.

Applications

The SIST EN 772-21:2011 standard is highly applicable in the following areas:

• Quality Control: Ensuring masonry units meet water absorption criteria stipulated in product specifications, leading to enhanced structural durability.
• Material Certification: Supporting manufacturers to verify compliance with European product standards such as EN 771-1 (clay bricks) and EN 771-2 (calcium silicate units).
• Construction Design: Informing engineers and architects on material suitability, particularly in environments where moisture resistance and frost durability are critical.
• Laboratory Testing: Standardized method for laboratory analysis of masonry units to support product development and conformity assessment.
• Building Regulations: Facilitating adherence to building codes that require documented evidence of moisture-related performance of masonry components.

Related Standards

SIST EN 772-21:2011 integrates seamlessly into the broader framework of masonry unit testing and specifications:

• EN 771 Series: Specifications for masonry units - covering clay bricks (EN 771-1), calcium silicate units (EN 771-2), and other masonry materials.
• EN 772 Series: Various test methods for masonry units, including strength, dimensional tolerances, and other physical properties.
• EN 1996 (Eurocode 6): Design of masonry structures, providing guidelines on material requirements and performance.
• EN 998-1: Specification for mortar used in masonry, where compatibility with masonry unit properties is essential.

By following EN 772-21, stakeholders in the construction and masonry industries can precisely determine water absorption, ensuring long-lasting building performance and compliance with European regulatory requirements. This standard underpins quality assurance by delivering reproducible and legally accepted water absorption measurements for clay and calcium silicate masonry units.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2011
0HWRGHSUHVNXãDQMD]LGDNRYGHO8JRWDYOMDQMHYSLMDQMDKODGQHYRGHRSHþQLK
LQDSQHQRSHãþHQLK]LGDNRY
Methods of test for masonry units - Part 21: Determination of water absorption of clay
and calcium silicate masonry units by cold water absorption
Prüfverfahren für Mauersteine - Teil 21: Bestimmung der Kaltwasseraufnahme von
Mauerziegeln und Kalksandsteinen
Méthodes d'essai des éléments de maçonnerie - Partie 21: Détermination de l'absorption
d'eau des éléments de maçonnerie en terre cuite et en silico-calcaire par absorption
d'eau froide
Ta slovenski standard je istoveten z: EN 772-21:2011
ICS:
91.100.15 Mineralni materiali in izdelki Mineral materials and
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 772-21
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2011
ICS 91.100.15
English Version
Methods of test for masonry units - Part 21: Determination of
water absorption of clay and calcium silicate masonry units by
cold water absorption
Méthodes d'essai des éléments de maçonnerie - Partie 21: Prüfverfahren für Mauersteine - Teil 21: Bestimmung der
Détermination de l'absorption d'eau des éléments de Kaltwasseraufnahme von Mauerziegeln und
maçonnerie en terre cuite et en silico-calcaire par Kalksandsteinen
absorption d'eau froide
This European Standard was approved by CEN on 25 December 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 772-21:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Principle .4
4 Symbols .4
5 Apparatus .4
6 Preparation .5
6.1 Sampling .5
6.2 Drying .5
7 Test procedure .5
8 Calculation of results .5
9 Evaluation of results .5
10 Test report .
...