ISO 1920-3:2004 download free.Testing of concrete Part 3 : Making and curing test specimens.
1 Scope
This part of ISO 1920 specifies the shape and dimensions of concrete test specimens for strength tests and the methods of making and culing these test specimens.
2 Normative references
The following referenced documents are essential for the application of ISO 1920-3. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1920-1, Testing of concrete — Part 1: Sampling of fresh concrete
ISO 1101:1983, Technical drawings — Geometrical tolerancing — Tolerancing of form, orientation, location and run-out — Generalities, definitions, symbols, indications on drawings
3 Terms and definitions
For the purpose of ISO 1920-3, the terms and definitions given in ISO 1101:1983 and the following apply.
nominal sizes of specimens
range of commonly used specimen sizes amongst which a preferred size is specified in this part of ISO 1920
3.2
designated size of specImens
specimen size selected and declared by the user of this part of ISO 1920 from amongst the permitted range of nominal sizes
NOTE The size of specimens is designated in millimetres.
NOTE The diameter of 113mm corresponds to a loadbeanng area of 10 000 mm2.
The preferred sizes are 100 mm 200 mm. 125 mm 250 mm and 150 mm 300 mm.
The height. I,, of the cylinder shall be 2d except for specimens used for the tensile splitting test. In the latter
case, the height of the specimen shall be between d and 11.
4.3.2 Designated sizes
Designated sizes may be selected within ± 10 % of a nominal size.
4.3.3 Tolerances
The following tolerances apply.
a) The tolerance on the designated diameter, d, shall be ± 0,5 %.
b) The tolerance on the flatness of the load-beann9 surfaces shall be ± 0,000 5 d. expressed in millimetres, except for cylinders tested by unbonded capping methods.
c) The tolerance on the flatness of the load-bearing surfaces of cylinders tested by unbonded capping methods, such as sand box or elastomeric pads, shall be + 0,02 d, expressed In millimetres.
d) The load-bearing surfaces shall be parallel to a tolerance of not greater than 1.0 millimetres.
e) The tolerance on the perpendicularity of the sides of the cylinder with reference to the end faces shall be ± 0.5 mm.
f) The tolerance on the height, h, of the cylinders shall be ± 5 %.
g) The straightness tolerance on any surface parallel to the centre line of the cylinders to be used in compression tests shall be ± 0,5 mm.
h) The straightness tolerance of any surface parallel to the centre line of the cylinders to be used in tensile splitting tests shall be ± 0,2 mm.
44.2 Designated sizes
The designated depth, l, and width, 12. of prisms shall be selected from one of the nominal sizes given in
4.4.1.
The designated length, L, of prisms shall be not less than 3,5 1.
4.4.3 Tolerances
The following tolerances apply.
a) The tolerance on the designated depth. I. and width, ‘2 shall be ± 0,5 %.
b) The tolerance on the designated length. L. shall be ± 5 %.
C) The load-bearing surfaces shall be parallel to a tolerance not greater than 1.0 mm.
d) The tolerance on the perpendicularity of the sides of the prism with reference to the base shall be ± 0.5 mm.
e) The tolerance on the straightness of the load-beanng area for specimens to be used for bending (flexural) tests shall be ± 0,2 mm.
5 Apparatus
5.1 Apparatus for measuring the test specimens
5.1.1 Callip.rs andlor rules, capable of establishing that the relevant dimensions of specimens or moulds are within 0,5 % of the dimension,
5.1.2 Gauge. capable of establishing that the relevant flatness of specimens or moulds is within ± 0,000 5 1 or d.
5.1.3 Squares and gauges (or other similar means), capable of establishing the perpendicularity and parallelism of specimens and moulds within ± 0,5 mm.
5.2 Apparatus for making test specimens
5.2.1 Moulds. capable of providing test specimens with the dimensions and tolerances that conform to this part of ISO 1920.
The moulds shall be made of steel or cast-iron, which shall be the reference materials. If moulds are manufactured from other materials, performance test data shall be available that demonstrate equivalence with the steel or cast-iron moulds. Lightweight cylindrical moulds shall conform to the requirements in Annex C.
Moulds shall be watertight and shall be non-absorbent.
Moulds shall be checked at intervals of not more than 1 year. If the mould Is in calibration at time of use, the checking of parallelism, verticality and flatness of specimens is not required, provided the size measurements are within tolerance.
Individual moulds shall be identifiable. The designation should be an identification number either welded on the mould body or securely tagged to the moulds.
5.2.2 Filling frame, fitted tightly to the mould and used to simplify the filling of the moulds.
The use of a filling frame is optional, but if used, this shall be stated in the test report (see Clause 9).
5.2.3 Means of compacting the concrete in the mould, which shall be one of the following:
5.2.3.1 internal vibrator, with a minimum frequency of 120 Hz (7 200 cycles per minutes). The diameter of the tube shall not exceed one-quarter of the smallest dimension of the test specimen:
5.2.3.2 vIbrating table, with a minimum frequency of 40 Hz (2 400 cycles per minute):
5.2.3.3 compactIng rod, of circular cross-section, straight, made of steel, having a diameter of
16 mm ± 1 mm and a length of 600 mm ± 5 mm, and with rounded, roughly hemispherical, ends:
5.2.3.4 compacting bar, made of steel having a square or circular cross-section and a mass greater than 1.8 kg.
5.2.4 General tools, Including the foIowing:
Before filling, cover the inner surface of the mould with a thin film of mineral oil or any other material to prevent the concrete from adhering to the mould.
Place the mould on a firm and level area
If a filling frame is used, the amount of concrete used to fill the mould shall be such that a layer of concrete remains in the filling frame after compaction. The thickness of this layer shall be 10 % to 20 % of the height of the test specimen.
Place the concrete in the mould by means of a scoop, in such a way as to remove as much entrapped air as possible (without significantly reducing the amount of entrained air, if present). The concrete shall be placed in a minimum of two layers approximately equal in depth and each not more than 100 mm thick.
Use the quantity of material in the final layer that, as nearly as possible, is just sufficient to fill the container without having to remove excess material. A small quantity of additional concrete may be added if necessary and further compacted in order to just fill the container, but the removal of excess material should be avoided.
6.3 Compaction of the concrete
Compact the concrete immediately after each layer is placed in the moulds in such a way as to produce full compaction of the concrete with neither excessive segregation nor laitance. Compact each layer by using one of the methods described in Annex 0.
6.4 Surface levelling
If a filling frame is used. remove it immediately after compaction.
Remove the concrete above the upper edge of the mould using the two steel floats brought together with a
sawing action or with a sawing action using a straight edge and level the surface carefully.
6.5 Marking
Identify the test specimens with a clear and durable marking, and without damaging the specimen. Keep records to ensure that the specimen identity is known from sampling to testing.
9.2 The report shall include the following with regards to curing the specimens:
a) method of curing specimens prior to demoulding, including duration, cunng conditions and temperature range;
b) condition of specimens at receipt for storage (if appropriate);
C) method of storing specimens after demoulding including transportation conditions (if appropriate), temperature range and duration of curing;
ci) any deviation from the standard method of making the specimen(s).
9.3 The report shall include a declaration by the person technically responsible that the samples were prepared in accordance with this part of ISO 1920, except as noted in 9.1 j) or 9.2 d).