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EN 772-1:2011+A1:2015

Current

Current

The latest, up-to-date edition.

Methods of test for masonry units - Part 1: Determination of compressive strength

Published date

06-24-2015

Foreword
1 Scope
2 Normative references
3 Principle
4 Symbols
5 Materials
6 Apparatus
7 Preparation of specimens
8 Procedure
9 Calculation and expression of results
10 Evaluation of results
11 Test report
Annex A (informative) - Conversion of the compressive
        strength of masonry units to the normalised
        compressive strength
Annex B (normative) - Surface preparation and
        conditioning of units

This European Standard specifies a method for determining the compressive strength of masonry units.

DevelopmentNote
2011 Edition Re-Issued in June 2015 & incorporates AMD 1 2015. (07/2015)
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

BS EN 846-14:2012 Methods of test for ancillary components for masonry Determination of the initial shear strength between the prefabricated part of a composite lintel and the masonry above it
PD CEN/TS 12633:2014 Method of polishing specimens prior to the measurement of slip and skid resistance
DIN EN 15435:2008-10 PRECAST CONCRETE PRODUCTS - NORMAL WEIGHT AND LIGHTWEIGHT CONCRETE SHUTTERING BLOCKS - PRODUCT PROPERTIES AND PERFORMANCE
10/30212126 DC : 0 BS EN 845-2 - SPECIFICATION FOR ANCILLARY COMPONENTS FOR MASONRY - PART 2: LINTELS
BS EN 12059 : 2008 NATURAL STONE PRODUCTS - DIMENSIONAL STONE WORK - REQUIREMENTS
S.R. CEN/TR 17024:2017 NATURAL STONES - GUIDANCE FOR USE OF NATURAL STONES
UNI CEN/TS 12633 : 2014 METHOD OF POLISHING SPECIMENS PRIOR TO THE MEASUREMENT OF SLIP AND SKID RESISTANCE
UNE-EN 846-14:2013 Methods of test for ancillary components for masonry - Part 14: Determination of the initial shear strength between the prefabricated part of a composite lintel and the masonry above it
DIN EN 771-6:2015-11 SPECIFICATION FOR MASONRY UNITS - PART 6: NATURAL STONE MASONRY UNITS
BS EN 845-2 : 2013 SPECIFICATION FOR ANCILLARY COMPONENTS FOR MASONRY - PART 2: LINTELS
BS EN 1052-3:2002 Methods of test for masonry Determination of initial shear strength
BS EN 846-8:2000 Methods of test for ancillary components for masonry Determination of load capacity and load-deflection characteristics of joist hangers
CEN/TR 17024:2017 Natural stones - Guidance for use of natural stones
EN 1052-5:2005 Methods of test for masonry - Part 5: Determination of bond strength by the bond wrench method
CEN/TS 12633:2014 Method of polishing specimens prior to the measurement of slip and skid resistance
EN 12059:2008+A1:2011 Natural stone products - Dimensional stone work - Requirements
EN 1052-2:2016/AC:2017 METHODS OF TEST FOR MASONRY - PART 2: DETERMINATION OF FLEXURAL STRENGTH
10/30212141 DC : 0 BS EN 846-14 - METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 14: LINTELS
UNI EN 846-14 : 2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 14: DETERMINATION OF THE INITIAL SHEAR STRENGTH BETWEEN THE PREFABRICATED PART OF A COMPOSITE LINTEL AND THE MASONRY ABOVE IT
12/30265747 DC : 0 BS EN 845-2 - SPECIFICATION FOR ANCILLARY COMPONENTS FOR MASONRY - PART 2: LINTELS
UNI EN 15080-12 : 2011 EXTENDED APPLICATION OF RESULTS FROM FIRE RESISTANCE TESTS - PART 12: LOADBEARING MASONRY WALLS
DIN V 18153-100:2005-10 CONCRETE MASONRY UNITS (NORMAL-WEIGHT CONCRETE) - PART 100: MASONRY UNITS WITH SPECIFIC PROPERTIES
02/102876 DC : DRAFT APR 2002 PREN 1052-5 - METHODS OF TEST FOR MASONRY - PART 5: DETERMINATION OF BOND STRENGTH BY THE BOND WRENCH METHOD
I.S. EN 15080-12:2011 EXTENDED APPLICATION OF RESULTS FROM FIRE RESISTANCE TESTS - PART 12: LOADBEARING MASONRY WALLS
PREN 17193 : DRAFT 2017 CLAY BLOCKS FOR FLOOR PLATES
DIN EN 12059:2012-03 NATURAL STONE PRODUCTS - DIMENSIONAL STONE WORK - REQUIREMENTS
PREN 771-6 : DRAFT 2010 SPECIFICATION FOR MASONRY UNITS - PART 6: NATURAL STONE MASONRY UNITS
S.R. CEN/TS 12633:2014 METHOD OF POLISHING SPECIMENS PRIOR TO THE MEASUREMENT OF SLIP AND SKID RESISTANCE
UNI EN 15435 : 2008 PRECAST CONCRETE PRODUCTS - NORMAL WEIGHT AND LIGHTWEIGHT CONCRETE SHUTTERING BLOCKS - PRODUCT PROPERTIES AND PERFORMANCE
UNE-EN 15080-12:2011 Extended application of results from fire resistance tests - Part 12: Loadbearing masonry walls
DIN EN 772-18:2011-07 Methods of test for masonry units - Part 18: Determination of freeze-thaw resistance of calcium silicate masonry units
BS EN 1052-5:2005 Methods of test for masonry Determination of bond strength by the bond wrench method
I.S. EN 771-3:2011 SPECIFICATION FOR MASONRY UNITS - PART 3: AGGREGATE CONCRETE MASONRY UNITS (DENSE AND LIGHTWEIGHT AGGREGATES)
I.S. EN 771-6:2011 SPECIFICATION FOR MASONRY UNITS - PART 6: NATURAL STONE MASONRY UNITS
DIN EN 1996-1-1:2013-02 Eurocode 6: Design of masonry structures - Part 1-1: General rules for reinforced and unreinforced masonry structures (includes Amendment 1:2012)
DIN EN 1052-5:2005-06 Methods of test for masonry - Part 5: Determination of bond strength by the bond wrench method
DIN EN 1052-3:2007-06 Methods of test for masonry - Part 3: Determination of initial shear strength (includes Amendment A1:2007)
I.S. EN 771-1:2011 SPECIFICATION FOR MASONRY UNITS - PART 1: CLAY MASONRY UNITS
I.S. EN 846-7:2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 7: DETERMINATION OF SHEAR LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF SHEAR TIES AND SLIP TIES (COUPLET TEST FOR MORTAR JOINT CONNECTIONS)
I.S. EN 13167:2012 THERMAL INSULATION PRODUCTS FOR BUILDINGS - FACTORY MADE CELLULAR GLASS (CG) PRODUCTS - SPECIFICATION
I.S. EN 771-5:2011 SPECIFICATION FOR MASONRY UNITS - PART 5: MANUFACTURED STONE MASONRY UNITS
I.S. EN 1052-2:2016 METHODS OF TEST FOR MASONRY - PART 2: DETERMINATION OF FLEXURAL STRENGTH
I.S. EN 845-2:2013 SPECIFICATION FOR ANCILLARY COMPONENTS FOR MASONRY - PART 2: LINTELS
I.S. EN 846-9:2016 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 9: DETERMINATION OF FLEXURAL RESISTANCE AND SHEAR RESISTANCE OF LINTELS
I.S. EN 771-4:2011 SPECIFICATION FOR MASONRY UNITS - PART 4: AUTOCLAVED AERATED CONCRETE MASONRY UNITS
I.S. EN 846-5:2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 5: DETERMINATION OF TENSILE AND COMPRESSIVE LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF WALL TIES (COUPLET TEST)
DIN EN 1052-2:2016-08 METHODS OF TEST FOR MASONRY - PART 2: DETERMINATION OF FLEXURAL STRENGTH
I.S. EN 846-6:2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 6 - DETERMINATION OF TENSILE AND COMPRESSIVE LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF WALL TIES (SINGLE END TEST)
I.S. EN 1996-1-1:2005 EUROCODE 6 - DESIGN OF MASONRY STRUCTURES - PART 1-1: GENERAL RULES FOR REINFORCED AND UNREINFORCED MASONRY STRUCTURES (INCLUDING IRISH NATIONAL ANNEX)
I.S. EN 772-18:2011 METHODS OF TEST FOR MASONRY UNITS - PART 18: DETERMINATION OF FREEZE-THAW RESISTANCE OF CALCIUM SILICATE MASONRY UNITS
I.S. EN 771-2:2011 SPECIFICATION FOR MASONRY UNITS - PART 2: CALCIUM SILICATE MASONRY UNITS
10/30203906 DC : 0 BS EN 771-6 - SPECIFICATION FOR MASONRY UNITS - PART 6: NATURAL STONE MASONRY UNITS
DIN EN 846-14:2012-11 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 14: DETERMINATION OF THE INITIAL SHEAR STRENGTH BETWEEN THE PREFABRICATED PART OF A COMPOSITE LINTEL AND THE MASONRY ABOVE IT
PREN 771-1 : DRAFT 2010 SPECIFICATION FOR MASONRY UNITS - PART 1: CLAY MASONRY UNITS
PD CEN/TR 17024:2017 Natural stones. Guidance for use of natural stones
DIN EN 15080-12:2011-04 Extended application of results from fire resistance tests - Part 12: Loadbearing masonry walls
DIN EN 13167:2015-04 THERMAL INSULATION PRODUCTS FOR BUILDINGS - FACTORY MADE CELLULAR GLASS (CG) PRODUCTS - SPECIFICATION
DIN EN 1996-3:2010-12 Eurocode 6: Design of masonry structures - Part 3: Simplified calculation methods for unreinforced masonry structures (includes Corrigendum AC:2009)
BS EN 846-9:2016 Methods of test for ancillary components for masonry Determination of flexural resistance and shear resistance of lintels
BS EN 771-4 : 2011 SPECIFICATION FOR MASONRY UNITS - PART 4: AUTOCLAVED AERATED CONCRETE MASONRY UNITS
UNE-EN 846-5:2013 Methods of test for ancillary components for masonry - Part 5: Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (couplet test)
UNE-EN 771-6:2012 Specification for masonry units - Part 6: Natural stone masonry units
EN 771-6:2011+A1:2015 Specification for masonry units - Part 6: Natural stone masonry units
EN 846-6:2012 Methods of test for ancillary components for masonry - Part 6: Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (single end test)
UNI EN 772-18 : 2011 METHODS OF TEST FOR MASONRY UNITS - PART 18: DETERMINATION OF FREEZE-THAW RESISTANCE OF CALCIUM SILICATE MASONRY UNITS
UNI EN 846-7 : 2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 7: DETERMINATION OF SHEAR LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF SHEAR TIES AND SLIP TIES (COUPLET TEST FOR MORTAR JOINT CONNECTIONS)
UNI EN 846-6 : 2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 6: DETERMINATION OF TENSILE AND COMPRESSIVE LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF WALL TIES (SINGLE END TEST)
UNI EN 846-5 : 2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 5: DETERMINATION OF TENSILE AND COMPRESSIVE LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF WALL TIES (COUPLET TEST)
EN 771-3:2011+A1:2015 Specification for masonry units - Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates)
UNI EN 1996-1-1 : 2013 EUROCODE 6 - DESIGN OF MASONRY STRUCTURES - PART 1-1: GENERAL RULES FOR REINFORCED AND UNREINFORCED MASONRY STRUCTURES
DIN V 18152-100:2005-10 LIGHTWEIGHT CONCRETE SOLID BRICKS AND BLOCKS - PART 100: SOLID BRICKS AND BLOCKS WITH SPECIFIC PROPERTIES
I.S. EN 1996-3:2006 EUROCODE 6 - DESIGN OF MASONRY STRUCTURES - PART 3: SIMPLIFIED CALCULATION METHODS FOR UNREINFORCED MASONRY STRUCTURES (INCLUDING IRISH NATIONAL ANNEX)
07/30172842 DC : 0 BS EN 15080-12 - EXTENDED APPLICATION OF RESULTS FROM FIRE RESISTANCE TESTS - PART 12: LOADBEARING MASONRY WALLS
10/30203890 DC : 0 BS EN 771-1 - SPECIFICATION FOR MASONRY UNITS - PART 1: CLAY MASONRY UNITS
01/104607 DC : DRAFT MAY 2001 PREN 771-6 - SPECIFICATION FOR MASONRY UNITS - PART 6: NATURAL STONE MASONRY UNITS
I.S. EN 846-14:2012 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 14: DETERMINATION OF THE INITIAL SHEAR STRENGTH BETWEEN THE PREFABRICATED PART OF A COMPOSITE LINTEL AND THE MASONRY ABOVE IT
I.S. EN 12059:2008 NATURAL STONE PRODUCTS - DIMENSIONAL STONE WORK - REQUIREMENTS
PREN 845-2 : DRAFT 2012 SPECIFICATION FOR ANCILLARY COMPONENTS FOR MASONRY - PART 2: LINTELS
I.S. EN 15435:2008 PRECAST CONCRETE PRODUCTS - NORMAL WEIGHT AND LIGHTWEIGHT CONCRETE SHUTTERING BLOCKS - PRODUCT PROPERTIES AND PERFORMANCE
BS EN 772-18:2011 Methods of test for masonry units Determination of freeze-thaw resistance of calcium silicate masonry units
BS EN 771-1 : 2011 SPECIFICATION FOR MASONRY UNITS - PART 1: CLAY MASONRY UNITS
BS EN 13167 : 2012 THERMAL INSULATION PRODUCTS FOR BUILDINGS - FACTORY MADE CELLULAR GLASS (CG) PRODUCTS - SPECIFICATION
BS EN 1052-2:2016 Methods of test for masonry Determination of flexural strength
BS EN 771-2 : 2011 SPECIFICATION FOR MASONRY UNITS - PART 2: CALCIUM SILICATE MASONRY UNITS
UNE-EN 13167:2013 Thermal insulation products for buildings - Factory made cellular glass (CG) products - Specification
UNE-EN 12059:2008 Natural stone products - Dimensional stone work - Requirements
UNE-EN 846-6:2015 Methods of test for ancillary components for masonry - Part 6: Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (single end test)
BS EN 846-5:2012 Methods of test for ancillary components for masonry Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (couplet test)
BS EN 1996-1-1 : 2005 EUROCODE 6 - DESIGN OF MASONRY STRUCTURES - PART 1-1: GENERAL RULES FOR REINFORCED AND UNREINFORCED MASONRY STRUCTURES
BS EN 771-3 : 2011 SPECIFICATION FOR MASONRY UNITS - PART 3: AGGREGATE CONCRETE MASONRY UNITS (DENSE AND LIGHTWEIGHT AGGREGATES)
BS EN 771-5 : 2011 SPECIFICATION FOR MASONRY UNITS - PART 5: MANUFACTURED STONE MASONRY UNITS
BS EN 846-6:2012 Methods of test for ancillary components for masonry Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (single end test)
BS EN 846-7:2012 Methods of test for ancillary components for masonry Determination of shear load capacity and load displacement characteristics of shear ties and slip ties (couplet test for mortar joint connections)
UNE-EN 846-7:2015 Methods of test for ancillary components for masonry - Part 7: Determination of shear load capacity and load displacement characteristics of shear ties and slip ties (couplet test for mortar joint connections)
EN 845-2:2013+A1:2016 SPECIFICATION FOR ANCILLARY COMPONENTS FOR MASONRY - PART 2: LINTELS
EN 846-7:2012 Methods of test for ancillary components for masonry - Part 7: Determination of shear load capacity and load displacement characteristics of shear ties and slip ties (couplet test for mortar joint connections)
EN 1996-1-1:2005+A1:2012 Eurocode 6 - Design of masonry structures - Part 1-1: General rules for reinforced and unreinforced masonry structures
EN 1996-3:2006/AC:2009 EUROCODE 6 - DESIGN OF MASONRY STRUCTURES - PART 3: SIMPLIFIED CALCULATION METHODS FOR UNREINFORCED MASONRY STRUCTURES
EN 771-5:2011+A1:2015 Specification for masonry units - Part 5: Manufactured stone masonry units
EN 846-5:2012 Methods of test for ancillary components for masonry - Part 5: Determination of tensile and compressive load capacity and load displacement characteristics of wall ties (couplet test)
EN 15435:2008 Precast concrete products - Normal weight and lightweight concrete shuttering blocks - Product properties and performance
EN 772-18:2011 Methods of test for masonry units - Part 18: Determination of freeze-thaw resistance of calcium silicate masonry units
EN 15080-12:2011 Extended application of results from fire resistance tests - Part 12: Loadbearing masonry walls
EN 771-4:2011+A1:2015 Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units
EN 771-2:2011+A1:2015 Specification for masonry units - Part 2: Calcium silicate masonry units
EN 846-14:2012 Methods of test for ancillary components for masonry - Part 14: Determination of the initial shear strength between the prefabricated part of a composite lintel and the masonry above it
EN 771-1:2011+A1:2015 Specification for masonry units - Part 1: Clay masonry units
EN 846-8:2000/A1:2006 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 8: DETERMINATION OF LOAD CAPACITY AND LOAD-DEFLECTION CHARACTERISTICS OF JOIST HANGERS
EN 846-4:2001/A1:2004 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 4: DETERMINATION OF LOAD CAPACITY AND LOAD-DEFLECTION CHARACTERISTICS OF STRAPS
EN 846-9:2016 Methods of test for ancillary components for masonry - Part 9: Determination of flexural resistance and shear resistance of lintels
DIN EN 15435 E : 2008 PRECAST CONCRETE PRODUCTS - NORMAL WEIGHT AND LIGHTWEIGHT CONCRETE SHUTTERING BLOCKS - PRODUCT PROPERTIES AND PERFORMANCE
BS EN 15080-12:2011 Extended application of results from fire resistance tests Loadbearing masonry walls
BS EN 15435:2008 Precast concrete products. Normal weight and lightweight concrete shuttering blocks. Product properties and performance
UNE-EN 1996-1-1:2011 Eurocode 6 - Design of masonry structures - Part 1-1: General rules for reinforced and unreinforced masonry structures
UNI EN 12059 : 2012 NATURAL STONE PRODUCTS - DIMENSIONAL STONE WORK - REQUIREMENTS
DIN EN 771-1:2015-11 Specification for masonry units - Part 1: Clay masonry units; German version EN 771-1:2011+A1:2015
DIN EN 771-2:2015-11 Specification for masonry units - Part 2: Calcium silicate masonry units (includes Amendment A1:2015)
DIN EN 771-5:2015-11 SPECIFICATION FOR MASONRY UNITS - PART 5: MANUFACTURED STONE MASONRY UNITS
DIN EN 771-4:2015-11 SPECIFICATION FOR MASONRY UNITS - PART 4: AUTOCLAVED AERATED CONCRETE MASONRY UNITS
DIN EN 771-3:2015-11 SPECIFICATION FOR MASONRY UNITS - PART 3: AGGREGATE CONCRETE MASONRY UNITS (DENSE AND LIGHTWEIGHT AGGREGATES)
BS EN 1996-3:2006 Eurocode 6. Design of masonry structures Simplified calculation methods for unreinforced masonry structures
BS EN 771-6 : 2011 SPECIFICATION FOR MASONRY UNITS - PART 6: NATURAL STONE MASONRY UNITS
EN 13167:2012+A1:2015 Thermal insulation products for buildings - Factory made cellular glass (CG) products - Specification
DIN EN 846-7:2012-11 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 7: DETERMINATION OF SHEAR LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF SHEAR TIES AND SLIP TIES (COUPLET TEST FOR MORTAR JOINT CONNECTIONS)
EN 1052-3:2002/A1:2007 METHODS OF TEST FOR MASONRY - PART 3: DETERMINATION OF INITIAL SHEAR STRENGTH
DIN EN 846-5:2012-11 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 5: DETERMINATION OF TENSILE AND COMPRESSIVE LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF WALL TIES (COUPLET TEST)
DIN EN 846-6:2012-11 METHODS OF TEST FOR ANCILLARY COMPONENTS FOR MASONRY - PART 6: DETERMINATION OF TENSILE AND COMPRESSIVE LOAD CAPACITY AND LOAD DISPLACEMENT CHARACTERISTICS OF WALL TIES (SINGLE END TEST)
UNE-EN 771-5:2011 Specification for masonry units - Part 5: Manufactured stone masonry units
UNE-EN 771-1:2011 Specification for masonry units - Part 1: Clay masonry units
UNE-EN 771-3:2011 Specification for masonry units - Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates)
UNE-EN 771-2:2011 Specification for masonry units - Part 2: Calcium silicate masonry units
UNE-EN 771-4:2011 Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units

ISO 6507-1:2005 Metallic materials Vickers hardness test Part 1: Test method
EN 771-3:2011+A1:2015 Specification for masonry units - Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates)
EN 771-4:2011+A1:2015 Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units
EN 772-2:1998/A1:2005 METHODS OF TEST FOR MASONRY UNITS - PART 2: DETERMINATION OF PERCENTAGE AREA OF VOIDS IN AGGREGATE CONCRETE MASONRY UNITS (BY PAPER INDENTATION)
EN 1015-11 : 1999 AMD 1 2006 METHODS OF TEST FOR MORTAR FOR MASONRY - PART 11: DETERMINATION OF FLEXURAL AND COMPRESSIVE STRENGTH OF HARDENED MORTAR
EN 771-6:2011+A1:2015 Specification for masonry units - Part 6: Natural stone masonry units
EN 772-16:2011 Methods of test for masonry units - Part 16: Determination of dimensions
EN 772-10:1999 Methods of test for masonry units - Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units
EN 771-1:2011+A1:2015 Specification for masonry units - Part 1: Clay masonry units
EN 771-5:2011+A1:2015 Specification for masonry units - Part 5: Manufactured stone masonry units
EN 771-2:2011+A1:2015 Specification for masonry units - Part 2: Calcium silicate masonry units
EN 772-13:2000 Methods of test for masonry units - Part 13: Determination of net and gross dry density of masonry units (except for natural stone)

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