ISO 20290-4:2019
(Main)Aggregates for concrete — Test methods for mechanical and physical properties — Part 4: Determination of ten percent fines value (TFV)
Aggregates for concrete — Test methods for mechanical and physical properties — Part 4: Determination of ten percent fines value (TFV)
This document gives the test method for determination of ten percent fines value (TFV) of aggregates. This method gives a relative measure of the resistance of the aggregate crushing under the gradually applied compressive load. It covers two sets of procedures: — the first procedure is applicable for aggregates tested in dry condition; and — the second procedure is applicable for aggregates tested in a soaked condition. NOTE 1 Generally, the test can be done under dry conditions. However, the engineer in charge can choose to test them in soaked condition, if necessary. The method is applicable to aggregates of different strengths covering both weak and strong aggregates. It is applicable to standards aggregates, i.e. passing a 14,0 mm test sieve and retained on 10,0 mm test sieve. National standards can also exist for the aggregate size fraction to be taken for this test. In case this definite size fraction is not available, the test can be made on other sizes, given in Annex A. The comparison of results of non-standard sizes with standard size aggregates is not possible due to lack of available data. NOTE 2 Minor variations in grading divisions can be allowed in respective national standards.
Granulats pour béton — Méthodes d'essai relatives aux propriétés mécaniques et physiques — Partie 4: Détermination de la valeur à dix pour cent de fines (TFV)
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 20290-4
First edition
2019-11
Aggregates for concrete — Test
methods for mechanical and physical
properties —
Part 4:
Determination of ten percent fines
value (TFV)
Granulats pour béton — Méthodes d'essai relatives aux propriétés
mécaniques et physiques —
Partie 4: Partie 4: Détermination de la valeur à dix pour cent de
fines (TFV)
Reference number
ISO 20290-4:2019(E)
©
ISO 2019
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ISO 20290-4:2019(E)
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ii © ISO 2019 – All rights reserved
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ISO 20290-4:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Sampling . 2
6 Apparatus . 2
6.1 General apparatus . 2
6.2 Additional apparatus . 4
7 Preparation of test portions and specimens . 4
7.1 Test portions . 4
7.2 Test specimens in a dry condition . 5
7.3 Test specimens in a soaked condition . 5
8 Procedure. 6
8.1 Aggregates in dry condition . 6
8.2 Aggregates in a soaked condition . 7
9 Calculations and expression of results . 7
10 Test report . 7
Annex A (informative) Recommended method for determining the ten per cent fines value
for other size fractions of aggregate . 8
© ISO 2019 – All rights reserved iii
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ISO 20290-4:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-
stressed concrete, Subcommittee SC 1, Test methods for concrete.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
A list of all parts in the ISO 20290 series can be found on the ISO website.
iv © ISO 2019 – All rights reserved
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INTERNATIONAL STANDARD ISO 20290-4:2019(E)
Aggregates for concrete — Test methods for mechanical
and physical properties —
Part 4:
Determination of ten percent fines value (TFV)
1 Scope
This document gives the test method for determination of ten percent fines value (TFV) of aggregates.
This method gives a relative measure of the resistance of the aggregate crushing under the gradually
applied compressive load.
It covers two sets of procedures:
— the first procedure is applicable for aggregates tested in dry condition; and
— the second procedure is applicable for aggregates tested in a soaked condition.
NOTE 1 Generally, the test can be done under dry conditions. However, the engineer in charge can choose to
test them in soaked condition, if necessary.
The method is applicable to aggregates of different strengths covering both weak and strong
aggregates. It is applicable to standards aggregates, i.e. passing a 14,0 mm test sieve and retained on
10,0 mm test sieve.
National standards can also exist for the aggregate size fraction to be taken for this test. In case
this definite size fraction is not available, the test can be made on other sizes, given in Annex A. The
comparison of results of non-standard sizes with standard size aggregates is not possible due to lack of
available data.
NOTE 2 Minor variations in grading divisions can be allowed in respective national standards.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes
of openings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
© ISO 2019 – All rights reserved 1
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ISO 20290-4:2019(E)
3.1
ten percent fines value
TFV
force required to produce ten percent fines with the percentage of material passing in the range 7,5 %
to 12,5 %, from Formula (1):
14F
max
TFV = (1)
m+4
where
F is the maximum force (in kN);
max
m is the percentage of material passing the 2,36 mm test sieve at the maximum force.
4 Principle
A test sample of aggregates is compacted in a specified manner into a steel cylinder fitted with a freely
moving plunger. The sample is then subjected to a load applied through the plunger. The aggregate gets
crushed under this load. The degree of crushing depends on the crushing resistance of the aggregates,
which is assessed by a sieving test on the crushed sample. The procedures repeated with various loads
to determine the maximum force which generates a given sieve analysis. This maximum force is taken
as the TFV.
5 Sampling
The sample used for the test (the laboratory sample) may be taken in accordance with the procedure
described in the relevant national standards.
6 Apparatus
6.1 General apparatus
6.1.1 Compression testing machine, capable of applying any force up to 500 kN and which can be
operated to give a uniform rate of loading so that this force is reached in 10 min (see 8.1.2).
6.1.2 Steel cylinder and plunger, with an open-ended steel cylinder of nominal 150 mm internal
diameter and with plunger and base plate as per Figure 1 and Table 1.
Table 1 — Principal dimensions of cylinder and plunger apparatus
Component Dimensions Nominal 150 mm Nominal 75 mm internal
(see Figure 1) internal dimeter of diameter of cylinder
cylinder (see Annex A)
mm mm
Cylinder Internal diameter, D 154 ± 0,5 78,0 ± 0,5
c
Internal depth, h 125 to 140 70,0 to 85,0
c
Minimum wall thickness, d 16,0 8,0
c
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ISO 20290-4:2019(E)
Table 1 (continued)
Component Dimensions Nominal 150 mm Nominal 75 mm internal
(see Figure 1) internal dimeter of diameter of cylinder
cylinder (see Annex A)
mm mm
Plunger Diameter of piston, D 152 ± 0,5 76,0 ± 0,5
p
Diameter of stem, D >95 to ≤D >45 to ≤D
s p p
Overall length of piston plus stem, L 100 to 115 60,0 to 80,0
p
Minimum depth of piston, h not less than 25,0 not less than 19,0
p
Diameter of hole, D 20,0 ± 0,1 10,0 ± 0,1
h
Baseplate Minimum thickness, d 10 10
b
Length of each side of square, L 200 to 230 110 to 115
b
NOTE See Table 1.
Figure 1 — Outline form of cylinder and plunger apparatus for ten per cent fines test
The surfaces in contact with the aggregate shall be machined and maintained in a smooth condition
and case hardened or otherwise treated to have a hardness value of 650 HV.
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ISO 20290-4:2019(E)
6.1.3 Tamping rod, made out of straight iron or steel bar of circular cross-section, (16 ± 1) mm diameter
and (600 ± 5) mm long, with both end semi-spherical.
6.1.4 Balance, of at least 3 kg capacity readable to 1 g.
6.1.5 Cylindrical metal measure, for measuring the sample, of sufficient rigidity to retain its form under
rough usage
...
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