Download Bs en 480-4 1997 Determination of Concrete Bleeding PDF

TitleBs en 480-4 1997 Determination of Concrete Bleeding
File Size84.2 KB
Total Pages8
Document Text Contents
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BRITISH STANDARD BS EN
480-4 : 1997

The European Standard EN 480-4 : 1996 has the status of a
British Standard

ICS 91.100.30

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

Admixtures for concrete,
mortar and grout Ð

Test methods

Part 4. Determination of bleeding of
concrete

Page 2

BS EN 480-4 : 1997

This British Standard, having
been prepared under the
direction of the Sector Board for
Building and Civil Engineering,
was published under the
authority of the Standards Board
and comes into effect on
15 June 1997

 BSI 1997

The following BSI references
relate to the work on this
standard:
Committee reference B/517/3
Draft for comment 91/13170 DC

ISBN 0 580 27439 X

Amendments issued since publication

Amd. No. Date Text affected

Committees responsible for this
British Standard

The preparation of this British Standard was entrusted by Technical Committee
B/517, Concrete, to Subcommittee B/517/3, Admixtures, upon which the following
bodies were represented:

Brick Development Association

British Aggregate Construction Materials Industries

British Cement Association

British Ceramic Research Ltd.

British Precast Concrete Federation Ltd.

British Ready Mixed Concrete Association

Building Employers' Confederation

Cement Admixtures Association

Concrete Society

Department of the Environment

Department of the Environment (Building Research Establishment)

Institute of Concrete Technology

Institution of Civil Engineers

Institution of Structural Engineers

Mortar Producers' Association Limited

Society of Chemical Industry

Page 4

ii  BSI 1997

BS EN 480-4 : 1997

National foreword

This Part of BS EN 480 has been prepared by Subcommittee B/517/3 and is the English
language version of EN 480-4 : 1996 Admixtures for concrete, mortar and grout Ð Test
methods Ð Part 4: Determination of bleeding of concrete, published by the European
Committee for Standardization (CEN).

This standard is part of a package of standards comprising BS EN 480 : Parts 1, 2, 4, 5,
6, 8, 10, 11 and 12, BS EN 934 : Parts 2 and 6. When all the standards in this package
have been published BS 5075 : Parts 1, 2, and 3 will be amended by deleting clauses
which conflict with standards in the package.

This standard has been prepared to provide a method to test water retaining concrete
admixtures for conformity to BS EN 934-2. It may find wider use to provide data on the
tendency of concrete to bleed.

The UK has drawn the attention of CEN to an error in the definition of w in clause 4; it
is a ratio not a percentage. The words `in percent' should be ignored.

Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, an EN title
page, pages 2 to 4, an inside back cover and a back cover.

Page 5

CEN
European Committee for Standardization

Comite EuropeÂen de Normalisation

EuropaÈisches Komitee fuÈ r Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

 1996 Copyright reserved to CEN members.
Ref. No. EN 480-4 : 1996 E

EUROPEAN STANDARD EN 480-4

NORME EUROPEÂ ENNE

EUROPAÈ ISCHE NORM September 1996

ICS 91.100.30

Descriptors: Construction materials, concrete, mortars: material, grouting, concrete admixtures, tests, determination, exudation, mixing
water

English version

Admixtures for concrete, mortar and grout Ð Test methods Ð

Part 4: Determination of bleeding of concrete

Adjuvants pour beÂton, mortier et coulis Ð
MeÂthodes d'essai Ð
Partie 4: DeÂtermination du ressuage du beÂton

Zusatzmittel fuÈr Beton, MoÈrtel und
EinpreûmoÈrtel Ð PruÈfverfahren Ð
Teil 4: Bestimmung der Wasserabsonderung des
Betons (Bluten)

This European Standard was approved by CEN on 1996-08-04. 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
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, Denmark,
Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

Page 6

Page 2
EN 480-4 : 1996

 BSI 1997

Foreword

This European Standard has been prepared by
Technical Committee CEN/TC 104, Concrete
(performance, production, placing and compliance
criteria), the secretariat of which is held by DIN.

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 March 1997,
and conflicting national standards shall be withdrawn
at the latest by March 1997.

This standard is applicable together with the other
standards of the EN 480 series for testing admixtures
according to the EN 934 series.

The EN 480 series consists of the following Parts:

Part 1: Reference concrete and reference mortar for
testing

Part 2: Determination of setting time

Part 4: Determination of bleeding of concrete

Part 5: Determination of capillary absorption

Part 6: Infrared analysis

Part 8: Determination of the conventional dry
material content

Part 10: Determination of water soluble chloride
content

Part 11: Determination of air void characteristics
in hardened concrete

Part 12: Determination of the alkali content of
admixtures

According to the CEN/CENELEC Internal Regulations,
the national standards organizations of the following
countries are bound to implement this European
Standard: Austria, Belgium, Denmark, Finland, France,
Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.

Contents

Page

1 Scope 3

2 Apparatus 3

3 Procedure 3

4 Calculations 3

5 Test report 3

Page 7

Page 3
EN 480-4 : 1996

 BSI 1997

1) When performing tests for declaration of conformity and certification purposes for water retaining admixtures, vibration of the
concrete is not required.

1 Scope
This European Standard describes a method to
determine the relative quantity of mixing water that
will bleed from a sample of freshly mixed concrete.
This method applies to concrete mixes with aggregates
having a maximum size up to 50 mm.

2 Apparatus
a) A rigid cylindrical vessel, of inside diameter of
(250 ± 10) mm and inside height of (280 ± 10) mm,
with a removable lid. The vessel shall be made from
non-absorbent material that will not react with the
binder and the inside shall be smooth and free from
corrosion, coatings or lubricants.

b) Balance, of sufficient capacity to weigh the load
required with an accuracy of 0,1 %.

c) Pipette, or other similar instrument, to draw off
the free water from the surface of the test specimen.

d) Graduated 100 ml measuring cylinder, to collect
and measure the amount of water withdrawn.

e) Cylindrical steel tamper, approximately 16 mm in
diameter and 600 mm long, with a hemispherical end.

f) Scoop.

g) Stopwatch.

h) Flat rounded steel float, with a diameter
of (100 ± 10) mm.

3 Procedure
The vessel (a) shall be filled with a representative
sample of the concrete to be tested to a height of
(250 ± 10) mm as follows:

± using the scoop (f), fill the container in three
layers, each corresponding to a third of the whole
volume, and compact each layer with 25 strokes of
the tamper (e);

± the tamper strokes shall be distributed uniformly
over the whole section and the different layers shall
be compacted so that the tamper penetrates each
layer as far as the surface of the underlying layer,
but not beyond;

± the compaction of the concrete may be completed
by vibration1);

± level the top of the concrete to a reasonably
smooth surface by a minimum amount of troweling
using the float (h);

± determine the weight of the sample.

The room in which the test is carried out shall have a
temperature of (20 ± 2) ÊC and a relative humidity not
less than 65 %. Place the vessel on a level platform or
floor free of vibration and cover it with a suitable lid.
Keep this lid in place throughout the test, except when
drawing off the water.

Using a pipette (c) (or similar instrument), draw off the
water that has accumulated on the surface, at 10 min
intervals during the first 40 min and at 30 min intervals
thereafter, until cessation of bleeding.

To facilitate the collection of the bleed water, the
container may be tilted carefully, by placing a small
block not more than 50 mm high under one side of the
container, 2 min before the water is withdrawn. In this
case, after removing the water, return the container to
the vertical position carefully, without jarring.

After each withdrawal, transfer the water to the
measuring cylinder (d) and record the accumulated
quantity of water.

4 Calculations
The bleeding B is expressed as a percentage of the
total water in the concrete as follows:

(1)B = 3 100
mw

w3ms
where

mw is the mass of the bleed water, in grams

ms is the mass of the sample, in grams

w is the proportion of water in the fresh concrete by
mass, in percent

It is assumed that the density of the bleed water
is 1 kg/l.

5 Test report
The bleeding shall be recorded as a percentage of the
total amount of water to the nearest 0,1 %.

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