Цемент для мурування. Частина 2. Методи випробувань / Masonry cement - Part 2: Test methods

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CONTENTS

1 2 З? 4 5 6 7 EN 413-2:2005, 1 Scope 1
2 Normative references 1
З? General requirements for testing ... 2
4 Determination of setting time 2
5 Preparation of standard mortar .... 4
6 Determination of water retention ... 9
7 Determination of air content 12
Bibliography 17

in

EN 413-2:2005 - - - -

MASONRY CEMENTPART 2: TEST METHODS 1 2 EN 196-1 EN 196-3:2005 EN 459-2:2001 EN 22768-1 1 SCOPE
This European Standard describes reference and alternative test methods to be used when testing masonry cements to assess their conformity to EN 413-1. It gives the tests on fresh mortar for consistence, water retention and air content.
In the event of a dispute, only the reference methods are used.

2 NORMATIVE REFERENCES

The following referenced documents are indispensable for the application 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 196-1, Methods of testing cement - Part 1: Determination of strength
EN 196-3:2005, Methods of testing cement - Part 3: Determination of setting time and soundness
EN 459-2:2001, Building lime - Part 2: Test methods
EN 22768-1, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 22768-1:1989)
3.1 3.2 3.2.1 3.2.2 3.3 3.4 4 4.1 3.1 Laboratory
Unless specifically stated to the contrary, all the tests described in this document shall be carried out in a laboratory where the air temperature is maintained at (20 3.2 Manufacturing tolerances for test equipment
3.2.1 Dimensions
Figures indicating the specified requirements for apparatus used in the tests described in this document shall include essential dimensions for which manufacturing tolerances are given.
Unless otherwise stated, tolerance class m according to EN 22768-1 should be applied.
NOTE All other dimensions are given for guidance.
3.2.2 Mass
Specified masses shall have manufacturing tolerances within 3.3 Tolerances for test equipment in use
Tolerances applying to apparatus, which has been subjected to wear in use shall not exceed twice the corresponding manufacturing tolerance unless alternative requirements are specified.
3.4 Number of tests
Where the test is one of a series subject to statistical control, determination of each property by a single test shall be the minimum required.
Where the test is not part of a series subject to statistical control, two tests shall be performed to determine each property.

4 DETERMINATION OF SETTING TIME

4.1 General
The setting time is determined by observing the penetration of a needle into a cement paste of standard consistence until it reaches a specified value.

4.2 4.3 4.3.1 4.3.2 Method 4.2 Method A
The setting time is determined in accordance with EN 196-3.
NOTE Experience has shown that the method specified in EN 196-3, in which the specimens are tested under water, is not suitable for some masonry cements which have low clinker contents.
4.3 Method 4.3.1 Test principle
The equipment used and the specimen preparation procedures are as described in EN 196-3 but with the additional requirement for a room or a humidity cabinet of adequate size and maintained at (20 4.3.2 Initial setting time procedure
Calibrate the Vicat apparatus with the needle, attached in advance of the test, by lowering the needle to rest on the base-plate to be used and adjusting the pointer to read zero on the scale. Raise the needle to the stand-by position. Fill a Vicat mould in accordance with 5.2.2 of EN 196-3:2005 with paste of standard consistence mixed in accordance with 5.2.1 of EN 196-3:2005.
Place the filled mould and base-plate in the room or humidity cabinet and after a suitable time, position the mould, base-plate and container under the needle of the Vicat apparatus. Lower the needle gently until it is in contact with the paste. Pause in that position for between 1 s and 2 s in order to avoid initial velocity or forced acceleration of the moving parts. Then release the moving parts quickly and allow the needle to penetrate vertically into the paste. Read the scale when penetration has ceased, or 30 s after the release of the needle, whichever is the earlier.
Record the scale reading, which indicates the distance between the end of the needle and the base plate, together with the time from zero. Repeat the penetration on the same specimen at conveniently spaced positions, not less than 8 mm from the rim of the mould or 5 mm from each other and at least 10 mm from the last penetration position,

4.3.3 4.3.4 4.3.5 5 5.1 at conveniently spaced intervals of time, e.g. at 10 min intervals. Between penetrations keep the specimen in a room or humidity cabinet. Clean the Vicat needle immediately after each penetration. Retain the specimen if determination of the final setting time is to be made.
4.3.3 Report - initial setting time
Report the time measured from zero at which the distance between the needle and the base-plate is (6 If the initial setting time exceeds 6 h determine the final setting time.
4.3.4 Final setting time procedure
Invert the filled mould and follow the procedure described in 6.3 of EN 196-3:2005 with the specimen held in the room or humidity cabinet at controlled humidity rather than under water.
4.3.5 Report - final setting time
Report the time measured from zero at which the needle first penetrates only 0,5 mm into the specimen as the final setting time of the cement, to the nearest 15 min.

5 PREPARATION OF STANDARD MORTAR

5.1 Principle
The properties of fresh mortar made with masonry cement are assessed on standard mortar prepared in accordance with EN 196-1, but with the water content necessary for the standard consistence.
The consistence is measured using the plunger apparatus (see 5.2) as the reference method to achieve the required value of penetration.
A flow table test (see 5.3) is allowed as an alternative to the plunger test but it is important that the flow table spread equivalent to the required value of penetration is established, using the same type of masonry cement as that which is to be tested.
5.2 5.2.1 5.2.2 5.2 Consistence of fresh mortar by plunger apparatus (reference method)
5.2.1 Apparatus
The mixer and ancillary equipment shall be as described in EN 196-1.
The plunger apparatus shown in Figure 1 shall conform to the dimensions specified.
The shape of the base plate (1) shall enable the mortar container (8) to be placed centrally below the plunger (7). The plunger shall have a hemispherical lower end, be resistant to corrosion and not attacked by mortar. The total mass of the rod (6) and plunger (7) shall be (90 The tamper (see Figure 2) shall consist of a round rod made of impermeable material with sheet metal protection and shall weigh (250 5.2.2 Procedure
Prepare the mortar according to the procedure described in EN 196-1 except that the water content shall be that determined to give the consistence required.
Before the start of each test wipe the plunger with a damp cloth.
Fill the container in two layers immediately after completing the mixing procedure. Compact each layer with 10 light strokes of the tamper.
Strike off the excess mortar, within 1 min of completion of mixing, by a gentle sawing action using the straightedge held at an angle of about 45 degrees. Then at a slightly flatter angle smooth the surface in a single direction in the reverse direction. After placing the container on the base-plate, release the plunger from its initial position (150 A value of penetration of (35 5.2.3 5.3 5.3.1 5.3.2 5.3.3 5.3.4 on new batches of mortar until the value of penetration of (35 Record the mass of water required in grams to obtain standard consistence and the value of penetration in millimetres.
5.2.3 Reproducibility
The reproducibility which can be expected, expressed as the standard deviation of the results of the penetration test obtained by different, well-experienced, laboratories is 3,0 mm.
5.3 Consistence of fresh mortar by flow table (alternative method)
5.3.1 Method
NOTE It is anticipated that the test detailed in this clause will be removed at the next revision of this document, due to the increasing availability and use of the plunger apparatus (see 5.2).
5.3.2 Apparatus
Flow table, as described in 5.5.2.1.2 of EN 459-2:2001.
5.3.3 Calibration
Calibrate the flow table, using the same type of masonry cement as that to be tested, against the plunger used for the consistence test described in 5.2. Carry out a minimum of three pairs of tests at different water contents in order to establish the spread range on the flow table which is equivalent to a (35 NOTE It is recommended to establish a relation in the range 30-40 mm
5.3.4 Procedure
Before the start of each test, ensure that the plate and inner surface of the mould are clean and dry.
If the flow table has not been used during the hour prior to the test, the empty table shall be jolted several times. There shall be neither fluid nor dirt between the bearing (6) and the boss (8) (see Figure 7 of EN 459-2:2001)
In order to determine the flow diameter, place the mould in the centre of the clean, dry surface of the flow table (5.3.2). Fill it with two layers of mortar (prepared just before in accordance with 5.2.2) during which operation the mould with the mounted hopper shall be held firmly onto the plate with one hand in such a way that its edge coincides with the circle engraved on the plate. Spread each layer of mortar by tamping it lightly 10 times with the tamper (Figure 2) so that the mould is filled uniformly.
Remove the hopper without delay, and strike off the excess mortar, within 1 min of completion of mixing, by a gentle sawing action using the straightedge held at an angle of about 45 degrees. Then at a slightly flatter angle smooth the surface in a single direction in the reverse direction. Cle