ISO 1920-14:2019

INTERNATIONAL ISO
STANDARD 1920-14
First edition
2019-11
Testing of concrete —
Part 14:
Setting time of concrete mixtures by
resistance to penetration
Essais du béton —
Partie 14: Temps de prise des mélanges de béton selon l'essai de
résistance à la pénétration
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Preparation of mortar specimens . 2
7 Storage of mortar specimens . 3
8 Number of specimens . 3
9 Procedure. 3
10 Plotting test results and calculation . 4
11 Report . 5
Foreword
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This document was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-
stressed concrete, Subcommittee SC 1, Test methods for concrete.
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iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 1920-14:2019(E)
Testing of concrete —
Part 14:
Setting time of concrete mixtures by resistance to
penetration
1 Scope
This document covers the method for determining the setting time of concrete with slump greater
than zero, by testing mortar sieved from the concrete mixture. The initial setting time and the final
setting time are the time intervals required for the mortar sieved from the concrete mixture to reach
the specified values of penetration resistance after the initial contact of cement and water.
The method can be used for determining the effect of variables such as temperature, type and content of
cement, concrete mix proportions and admixtures, on the time of setting and hardening characteristics
of concrete.
This test method is applicable under controlled laboratory conditions, as well as under field conditions.
2 Normative references
There are no normative references in this document.
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/
3.1
initial setting time
time elapsed, after the initial contact of cement and water, till the mortar (sieved from the concrete)
acquires a penetration resistance of 3,5 N/mm
3.2
final setting time
time elapsed, after the initial contact of cement and water, till the mortar (sieved from the concrete)
acquires a penetration resistance of 27,6 N/mm
4 Principle
A mortar sample is obtained by sieving a representative sample of fresh concrete. The mortar sample
is placed in a container and stored at a specified ambient temperature. The resistance of the mortar
to penetration by standard needles is measured at regular time intervals. The time of initial and final
setting are determined from a plot of penetration resistance versus elapsed time.
5 Apparatus
5.1 Containers for mortar specimens, rigid, watertight, non-absorptive, free of oil/grease, either
cylindrical or rectangular in cross-section, with minimum lateral dimension 150 mm and height at
least 150 mm.
The container for the mortar specimens from the concrete mixture shall provide enough mortar
surfaces for ten undisturbed readings of penetration resistance in accordance with clear distance
requirements specified in Clause 9.
5.2 Penetration resistance apparatus, of spring reaction type, graduated from 50 N to 600 N in
increments of 10 N or less, or hydraulic reaction-type apparatus with pressure gauge of 700 N to 900 N
capacity, graduated in increments of 10 N or less.
Indications of actual needle loads by these apparatus shall be accurate to 10 N. Removable needles of
2 2 2 2 2 2
645 mm , 323 mm , 161 mm , 65 mm , 32 mm , and 16 mm bearing areas shall be provided. Each
needle shank shall be scribed peripherally at a distance of 25 mm above the bearing face. The length
of the 16 mm needle shall be not more than 90 mm to minimize bending. The apparatus shall be
recalibrated periodically.
NOTE National specifications can also exist regarding cross-sectional area.
5.3 Pipette, or other suitable instrument for drawing o
...