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BRITISH STANDARD BS EN
772-3:1998
The European Standard EN772-3:1998has the status of a
British Standard
ICS91.100.20
Methods of test for
masonry unitsÐ
Part3:Determination of net volume and
percentage of voids of clay masonry units
by hydrostatic weighing
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BS EN
772-3:1998
This British Standard,having been prepared under the direction of the Sector
Committee for Building and Civil Engineering,was published under the authority of the Standards Committee and comes into effect on 15December 1998©BSI 1998
ISBN 058030695X
Amendments issued since publication Amd.No.
Date
Text affected
National foreword
This British Standard is the English language version of EN 772-3:1998.It is included in a package of standards declared by CEN/TC 125and is intended that it will partially superde BS 3921:1985Specification for clay bricks which will be withdrawn on 30September 2000if all the European Standards included in the package are available.
The UK participation in its preparation was entrusted by Technical Committee B/519,testing,to Subcommittee B/519/1,Masonry units,which has to:
Ðaid the text;
Ðprent to the responsible European committee any enquiries on the
interpretation,or proposals for change,and keep the UK interests informed;Ðmonitor related international and European developments and promulgate them in the UK.A list of organizations reprented on this subcommittee can be obtained on request to its cretary.Cross-references
The British Standards which implement international or European publications
referred to in this document may be found in the BSI Standards Catalogue under the ction entitled ªInternational Standards Correspondence Indexº,or by using the ªFindºfacility of the BSI Standards Electronic Catalogue.
A British Standard does not purport to include all the necessary provisions of a contract.Urs of British Standards are responsible for their correct application.Compliance with a British Standard does not of itlf confer immunity from legal obligations.
Summary of pages荣誉是什么意思
This document compris a front cover,an inside front cover,the EN title page,pages 2to 4,an inside back cover and a back cover.
L i c e n s e d C o p y : s h e f f i e l d u n s h e f f i e l d u n , n a , T u e N o v 07 06:41:29 G M T +00:00 2006, U n c o n t r o l l e d C o p y , (c ) B S I
CEN
Committee for Standardization
ÂEuropeÂen de Normalisation
Èisches Komitee fuÈr Normung
Central Secretariat:rue de Stassart36,B-1050Brusls
©1998CEN All rights of exploitation in any form and by any means rerved worldwide for CEN national
Members.
Ref.No.EN772-3:1998E EUROPEAN STANDARD EN772-3
NORME EUROPEÂENNE
EUROPAÈISCHE NORM August1998
ICS91.100.20
Descriptors:construction,masonry units,clay,tests,determination,volume,voids,percentage of voids,weight measurements
English version
Methods of test for masonry unitsÐPart3:Determination of
net volume and percentage of voids of clay masonry units
by hydrostatic weighing
MeÂthodes d'essai des eÂleÂments de maõonnerieÐ
Partie3:DeÂtermination du volume net et du
pourcentage des vides des eÂleÂments de maõonnerie
en terre cuite par peÂe hydrostatique.
PruÈfverfahren fuÈr MauersteineÐ
Teil3:Bestimmung des Nettovolumens und des
prozentualen Lochanteils von Mauerziegeln mittels
hydrostatischer WaÈgung(UnterwasrwaÈgung).
This European Standard was approved by CEN on2July1998.
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 Central Secretariat 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尘垢的近义词
CEN member into its own language and notified to the Central Secretariat has the
same status as the official versions.
CEN members are the national standards bodies of Austria,Belgium,Czech
Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,
Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,Switzerland and
United Kingdom.
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Page 2
EN 772-3:1998
©BSI 1998
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 125,Masonry,the Secretariat of which is held by BSI.
This European Standard shall be given the national standard,either by publication of text or by endor
ment,at the latest by and conflicting national standards shall be at the latest by September 2000.
According to the CEN/CENELEC Internal Regulations,the national standards organizations of the following countries are bound to implement this European
Standard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,Switzerland and the United Kingdom.
Contents
Page
Foreword 21Scope 32Normative references 33Principle 34Symbols 35Apparatus 36Sampling 37Test procedure 38Calculation and expression of results 39Test report
4
L i c e n s e d C o p y : s h e f f i e l d u n s h e f f i e l d u n , n a , T u e N o v 07 06:41:29 G M T +00:00 2006, U n c o n t r o l l e d C o p y , (c ) B S I
Page3
EN772-3:1998©BSI1998
1Scope
This European Standard specifies a method of
determining the net volume of and percentage of voids
in clay masonry units(including frogs and cells).
2Normative references
This European Standard incorporates by dated or
undated reference,provisions from other publications.
The normative references are cited at the
appropriate places in the text and the publications are
listed hereafter.For dated references,subquent
amendments to or revisions of any of the
publications apply to this European Standard only
when incorporated in it by amendment or revision.For
undated references the latest edition of the publication
referred to applies.
prEN771-1,Specification for masonry unitsÐ
Part1:Clay masonry units.
prEN772-16,Methods of test for masonry unitsÐ
Part16:Determination of dimensions.
3Principle
The principle of this test is to obtain the net volume of
the masonry unit by weighing in air and weighing in
water and to subtract this from the gross volume,
obtained by measurement of its dimensions,to obtain
the volume of voids.
4Symbols
M wu is the apparent mass of the specimen in
water(g).
M au is the mass of the specimen in air(g).
l u is the length of the specimen(mm).
w u is the width of the specimen(mm).
h u is the height of the specimen(mm).
V gu is the gross volume of the specimen(mm3).
V vu is the volume of voids in the specimen(mm3).
V nu is the net volume of the specimen(mm3).
r w is the density of water(g/mm3)
(approx.0,001g/mm3).
5Apparatus
5.1Tank,with adequate a
whole masonry unit.
5.2Weighing instrument,whole
masonry units with an0,1%of
their mass when dry.
6Sampling
The method of sampling shall be in accordance with
prEN771-1.The minimum number of specimens shall
be six,but a larger minimum number may be specified
in the product specification,in which ca that larger
number shall be ud.
7T est procedure
Measure the length(l u),width(w u)and height(h u)of
the specimen in accordance with prEN772-16.
Immer the specimen in water(5.1)for at
least1hour.When the apparent mass(M wu),
measured by two successive weighings at30min
intervals,differ by less than0,2%remove the specimen
from the water and record the result of the cond
weighing as the apparent mass(M wu).Remove surface
water with a damp towel and determine the weight
(M au)immediately.
8Calculation and expression of results
Calculate the net volume of the specimen(V nu)by
subtracting the mass of the specimen obtained by
weighing it under water from that obtained when
weighing it in air(M au2M wu)and dividing it by the
density of water(r w).Express the net volume of the
specimen to the nearest104mm3as
V nu=(1)
M au2M wu
r w
Determine the mean value of net volume
determinations to the nearest104mm3.
Calculate the gross volume of the specimen(V gu)by
multiplying the length(l u)by the height(h u)and
width(w u)of the specimen measured in accordance
with prEN772-16to the nearest104mm3.
V gu=l u3w u3h u(2)
Calculate the volume of voids(V vu)by
V vu=V gu2V nu(3)
Calculate the percentage of voids to the nearest1%by
3100%(4)
V vu
V gu
Determine the mean value,if required,to the
nearest1%.
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