SIST EN 12370:2020

Natural stone test methods - Determination of resistance to salt crystallisation

This document specifies a test method to assess the relative resistance of natural stones with an open porosity of greater than 5 %, measured in accordance with EN 1936, to damage caused by the crystallization of salts. The test is not necessary for low porosity stones.

Prüfverfahren für Naturstein - Bestimmung des Widerstandes gegen Kristallisation von Salzen

Dieses Dokument legt ein Prüfverfahren fest, um die relative Beständigkeit von Natursteinen, deren offene Porosität > 5 % ist, gemessen nach EN 1936 gegen Schäden durch die Kristallisation von Salzen zu bewerten. Das Prüfverfahren ist nicht erforderlich für Naturstein mit einer geringen Porosität.

Méthodes d'essai pour pierres naturelles - Détermination de la résistance à la cristallisation des sels

Le présent document spécifie une méthode d'essai pour évaluer la résistance relative aux altérations causées par la cristallisation des sels des pierres naturelles dont la porosité ouverte, mesurée conformément à l'EN 1936, est supérieure à 5 %. Cet essai n'est pas nécessaire pour les pierres à faible porosité.

Preskušanje naravnega kamna - Ugotavljanje odpornosti proti kristalizaciji soli

General Information

• Status: Published
• Public Enquiry End Date: 24-Apr-2019
• Publication Date: 30-Mar-2020
• ICS: 73.020 - Mining and quarrying
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: IKER - Ceramics
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Mar-2020
• Due Date: 17-May-2020
• Completion Date: 31-Mar-2020
• Ref Project: EN 12370:2020 - Natural stone test methods - Determination of resistance to salt crystallisation

Relations

• Replaces: SIST EN 12370:2000 - Natural stone test methods - Determination of resistance to salt crystallisation
• Effective Date: 01-May-2020

Overview

EN 12370:2020 - Natural stone test methods: Determination of resistance to salt crystallisation is a CEN standard that specifies a laboratory test to assess the relative resistance of natural stone (with open porosity > 5 %) to damage caused by salt crystallisation. The method uses repeated cycles of immersion in a 14 % sodium sulphate decahydrate solution followed by controlled drying to measure mass change and/or the number of cycles to disintegration. The test is intended for durability assessment of stones exposed to salt weathering and is not required for low-porosity materials.

Key Topics and Requirements

• Scope and applicability: Applies to natural stones whose open porosity is greater than 5 % (open porosity measured per EN 1936). Not intended for low-porosity stones.
• Specimen preparation:
  • Minimum six representative specimens (sampling usually by the client).
  • Cubes of (40 ± 1) mm sides, wet diamond sawn and ground.
  • Wash loose material and dry to constant mass at (105 ± 5) °C.
• Test solution and cycles:
  • Use a fresh 14 % sodium sulphate decahydrate solution (density ~1 055 kg/m3 at 20 °C) for each cycle.
  • Soak specimens 2 h at (20 ± 0.5) °C, then dry in a ventilated oven with controlled humidity and heat-up to (105 ± 5) °C.
  • Repeat the soak/dry cycle 15 times (or until specimen failure).
• Apparatus and controls:
  • Ventilated oven capable of (105 ± 5) °C and initial high relative humidity.
  • Precision balance (± 0.001 g) and controlled temperature bath/room for soaking.
• Results and reporting:
  • Express results as relative mass difference (ΔM) (% mass loss or gain) or number of cycles to failure.
  • Record photographic evidence and report specimen details, test conditions, deviations and mean results.

Applications and Users

• Practical uses:
  • Durability assessment of natural stone for façades, paving, coastal or de-icing salt exposure, and heritage conservation.
  • Material selection for architects, specifiers and engineers when salt weathering is a risk.
  • Quality control by quarry operators and stone suppliers.
  • Condition evaluation and material selection in building conservation and restoration.
• Typical users:
  • Accredited test laboratories, stone producers, architects, civil and structural engineers, conservators, and procurement teams specifying stone products.

Related Standards

• EN 1936 - determination of density and porosity (used to verify applicability)
• EN 12371 - determination of frost resistance (complementary durability test)
• EN 12407 - petrographic examination
• EN 12440 - denomination and commercial naming criteria

EN 12370:2020 should be used as part of a suite of natural stone test methods for a comprehensive assessment of stone durability under environmental and salt exposure conditions.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN 12370:2000
Preskušanje naravnega kamna - Ugotavljanje odpornosti proti kristalizaciji soli
Natural stone test methods - Determination of resistance to salt crystallisation
Prüfverfahren für Naturstein - Bestimmung des Widerstandes gegen Kristallisation von
Salzen
Méthodes d'essai pour pierres naturelles - Détermination de la résistance à la
cristallisation des sels
Ta slovenski standard je istoveten z: EN 12370:2020
ICS:
73.020 Rudarstvo in kamnolomsko Mining and quarrying
izkopavanje
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.

EN 12370
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 73.020; 91.100.15 Supersedes EN 12370:1999
English Version
Natural stone test methods - Determination of resistance
to salt crystallisation
Méthodes d'essai pour pierres naturelles - Prüfverfahren für Naturstein - Bestimmung des
Détermination de la résistance à la cristallisation des Widerstandes gegen Kristallisation von Salzen
sels
This European Standard was approved by CEN on 1 December 2019.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12370:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 5
5 Principle . 5
6 Apparatus . 5
7 Preparation of specimens . 6
7.1 Sampling . 6
7.2 Dimensions of test specimens . 6
7.3 Washing . 6
7.4 Drying . 6
8 Procedure. 6
9 Expression of results . 7
10 Test report . 7
Bibliography . 9
European foreword
This document (EN 12370:2020) has been prepared by Technical Committee CEN/TC 246 “Natural
stones”, the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2020, and conflicting national standards shall
be withdrawn at the latest by September 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12370:1999.
The significant changes between this document and the previous edition are listed herewith:
— updating of Clause 8.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This document describes a test designed to assess the salt crystallization resistance of natural stones
where it is relevant. The test cannot be used in isolation and results will be considered with other physical
tests to indicate durability; these include EN 12371 “Determination of frost resistance”.
1 Scope
This document specifies a test method to assess the relative resistance of natural stones with an open
porosity of greater than 5 %, measured in accordance with EN 1936, to damage caused by the
crystal
...