SIST EN 12390-17:2019
(Main)Testing hardened concrete - Part 17: Determination of creep of concrete in compression
Testing hardened concrete - Part 17: Determination of creep of concrete in compression
This document describes the procedure for determining the creep (total creep, basic creep and drying creep) of hardened concrete test specimens subjected to a sustained longitudinal compressive load.
The test is suitable for specimens having a declared value of D of the coarsest fraction of aggregates actually used in the concrete (Dmax) not greater than 32 mm.
Prüfung von Festbeton - Teil 17: Bestimmung des Kriechens von Beton unter Druckspannung
Dieses Dokument beschreibt das Verfahren zur Bestimmung des Kriechens (Gesamtkriechen, Grundkriechen und Trocknungskriechen) von Probekörpern aus Festbeton, die einer andauernden Längsdruck¬beanspruchung ausgesetzt sind.
Die Prüfung ist geeignet für Probekörper mit einem Nennwert D des Größtkorns der tatsächlich im Beton verwendeten Gesteinskörnung (Dmax) von höchstens 32 mm.
Essais pour béton durci - Partie 17 : Détermination du fluage du béton en compression
Le présent document décrit le mode opératoire pour déterminer le fluage (fluage total, fluage propre et fluage de dessiccation) d’éprouvettes de béton durci soumises à une charge de compression longitudinale prolongée.
L’essai est adapté aux éprouvettes ayant une valeur déclarée D de la partie la plus grosse des granulats réellement utilisés dans le béton (Dmax) ne dépassant pas 32 mm.
Preskušanje strjenega betona - 17. del: Določanje lezenja betona pod tlakom
Ta dokument opisuje postopek za določanje lezenja (skupnega, avtogenega (osnovnega) in v času sušenja) preskušancev iz strjenega betona, ki so podvrženi trajni vzdolžni tlačni obremenitvi. Preskus je primeren za preskušance, pri katerih je deklarirana vrednost D najbolj grobega agregata, ki je dejansko uporabljen v betonu (Dmax), največ 32 mm.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2019
Preskušanje strjenega betona - 17. del: Določanje lezenja betona pod tlakom
Testing hardened concrete - Part 17: Determination of creep of concrete in compression
Prüfung von Festbeton - Teil 17: Bestimmung des Kriechens von Beton unter
Druckspannung
Essais pour béton durci - Partie 17 : Détermination du fluage du béton en compression
Ta slovenski standard je istoveten z: EN 12390-17:2019
ICS:
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12390-17
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 91.100.30
English Version
Testing hardened concrete - Part 17: Determination of
creep of concrete in compression
Essais pour béton durci - Partie 17 : Détermination du Prüfung von Festbeton - Teil 17: Bestimmung des
fluage du béton en compression Kriechens von Beton unter Druckspannung
This European Standard was approved by CEN on 19 August 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12390-17:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 7
5 Apparatus . 7
6 Test specimens . 10
7 Procedure. 10
8 Calculation of creep (total creep, basic creep and drying creep) . 13
9 Test report . 14
10 Precision . 15
Bibliography . 16
European foreword
This document (EN 12390-17:2019) has been prepared by Technical Committee CEN/TC 104 “Concrete
and related products”, the secretariat of which is held by SN.
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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 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 is based on ISO 1920-9 and ASTM C512-02.
This standard is one of a series on testing concrete.
EN 12390, Testing hardened concrete, consists of the following parts:
— Part 1: Shape, dimensions and other requirements for specimens and moulds;
— Part 2: Making and curing specimens for strength tests;
— Part 3: Compressive strength of test specimens;
— Part 4: Compressive strength – Specification for testing machines;
— Part 5: Flexural strength of test specimens;
— Part 6: Tensile splitting strength of test specimens;
— Part 7: Density of hardened concrete;
— Part 8: Depth of penetration of water under pressure;
— Part 10: Determination of the carbonation resistance of concrete at atmospheric levels of carbon
dioxide;
— Part 11: Determination of the chloride resistance of concrete, unidirectional diffusion;
— Part 12: Determination of the potential carbonation resistance of concrete: Accelerated carbonation
method (in preparation);
— Part 13: Determination of secant modulus of elasticity in compression;
— Part 14: Semi-adiabatic method for the determination of heat released by concrete during its
hardening process;
— Part 15: Adiabatic method for the determination of heat released by concrete during its hardening
process;
— Part 16: Determination of the shrinkage of concrete;
— Part 17: Determination of creep of concrete in compression.
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.
1 Scope
This document describes the procedure for determining the creep (total creep, basic creep and drying
creep) of hardened concrete test specimens subjected to a sustained longitudinal compressive load.
The test is suitable for specimens having a declared value of D of the coarsest fraction of aggregates
actually used in the concrete (D ) not greater than 32 mm.
max
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.
EN 12350-1, Testing fresh concrete — Part 1: Sampling and common apparatus
EN 12390-1:2012, Testing hardened concrete — Part 1: Shape, dimensions and other requirements for
specimens and moulds
EN 12390-2, Testing hardened concrete — Part 2: Making and curing specimens for strength tests
EN 12390-3, Testing hardened concrete — Part 3: Compressive strength of test specimens
EN 12390-16, Testing hardened concrete — Part 16: Determination of the shrinkage of concrete
EN 12504-1, Testing concrete in structures — Part 1: Cored specimens — Taking, examining and testing
in compression
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:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
initial strain
strain measured immediately after the application of the test load on the specimen
3.2
creep
strain under constant load obtained in defined conditions of temperature and relative humidity
3.2.1
total creep
strain measured under constant load in defined conditions of temperature and relative humidity after
subtracting initial and shrinkage strain
3.2.2
basic creep
strain measured under constant load in isothermal conditions and in the absence of moisture exchange
between the specimen and the surrounding environment
3.2.3
drying creep
difference between total and basic creep
3.3
shrinkage strain
strain of specimens determined in accordance with EN 12390-16
3.4
total strain:
strain measured during the test
Note 1 to entry: This strain is the sum of initial strain, creep and shrinkage.
3.5
gauge length
L
base length
length used as reference for strain measurement
Note 1 to entry: Gauge length may be a straight line laying on the lateral surface of the specimen and parallel to
the principal axis or between two planes.
3.6
measurement points
positions along a straight line laying on the lateral surface of the specimen and parallel to the principal
axis (see Figure 1 a)) or in two planes (see Figure 1 b))
a) Measurement points in a line parallel
b) Measurement points in two planes
to principal axis
Key
L Gauge length
Figure 1 — Measurement points
4 Principle
Test specimens are subject to changes in length when subjected to a constant compressive load in
defined conditions of temperature and relative humidity.
5 Apparatus
5.1 Loading frame
The loading frame shall be sufficiently rigid to ensure uniform loading of the specimen(s) and capable of
applying and maintaining the required load to within ± 3 % on the specimen or group of specimens for
the duration of the test, irrespective of any change in the dimension of the specimen(s).
NOTE 1 An example of a schematic diagram of a loading frame with 3 specimens operated by a hydraulic
arrangement for the measurement of total or basic creep is given in Figure 2. Similar arrangements can also be
used for a spring-loaded system in which only the system of loading will be different.
Load shall be measured with a maximum permissible error of ± 2 %.
The flatness tolerance for any plates or platens shall be 0,05 mm for the area in contact with the
specimen.
NOTE 2 For the purpose of this document, flatness can be assessed by the measurement of straightness in four
positions (see EN 12390-1:2012, Annex B).
A maximum of 3 specimens may be stacked for simultaneous loading in a single loading frame.
Key
1 Distance plates 5 Pressure gauge
2 Spherical bearing 6 Hydraulic accumulator
3 Test specimen 7 From pump
4 Length measuring system
Figure 2 — Example of schematic diagram of a loading frame operated by hydraulics for the
measurement of creep in the case of 3 specimens tested simultaneously
5.2 Drying room or cabinet
A drying room or cabinet with suitably controlled temperature and humidity, shall be used for storing
specimens in air and for measuring their length.
The drying room or cabinet shall meet the following requirements.
a) Air shall be circulated through the room or cabinet so that the same specified conditions are
attained adjacent to all specimens under test.
The air velocity should not exceed 0,5m/s near the specimens.
b) The temperature in the room or cabinet shall be maintained at (20 ± 2) °C.
c) The relative humidity in the room or cabinet shall have a target value of between 50 % and 70 %
and maintained within ± 5 % of the target value. Other values may be used if allowed by national
provisions valid in place of use.
d) The temperature and relative humidity of the room or cabinet shall be monitored throughout the
duration of the test and recorded at intervals not exceeding 24 h.
Separate provisions may be required in the case of manual recording of data during laboratory
closure periods.
The drying room or cabinet shall be fitted with suitable racks for storing specimens. The racks shall
permit free circulation of air around specimens, except for necessary supports, and shall be so situated
with respect to the nearest wall or other obstruction that air circulation is not restricted in the
intervening space. The horizontal supports shall consist of non-absorptive members having a total
bearing width supporting the specimen of not more than 25 mm.
5.3 Length change measuring system
5.3.1 General
The length change measuring device shall have a resolution of at least 0,001 mm. The maximum
permissible error of for gauge lengths of 400 mm or more shall be ± 0,01 mm and for gauge lengths less
than 400 mm it shall be ± 0,005 mm. Gauges relying on friction contact shall not be used.
5.3.2 Callipers or rule
The callipers or rule shall be capable of determining the initial gauge length with a maximum
permissible error of ± 2,0 mm for gauge lengths of 400 mm or more and ± 1,0 mm for gauge lengths less
than 400 mm.
5.3.3 Reference bar (optional)
If a specific reference bar is required, it shall be made of invar metal or other material that has a similar
coefficient of expansion over the range of test temperatures.
The reference bar shal
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