EN 1097-4-2008 pdf download.Tests for mechanical and physical properties of aggregates – Part 4: Determination of the voids of dry compacted filler.
3.6
filler aggregate
aggregate. most of which passes a 0,063 mm sieve, which can be added to construction matenals to provide certain properties
4 Principle
The filler is compacted in a standard way by using a compaction apparatus.
The volume of the compacted filler Is determined using the height of the compacted filler bed. Using the known
particle density of the compacted filler, the air void content of the compacted filler is calculated.
5 Apparatus
5.1 All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5.
5.2 Ventilated drying oven, thermostatically controlled to maintain a temperature of(1 10 ± 5) C.
5.3 Desiccator, filled with an appropriate amount of desiccant.
5.4 Spatula
5.5 Compaction apparatus, made of hardened steel, conforming to EN 10025, consisting of the following elements.
NOTE Examples of typical apparatus are shown in Figure 1 and Figure 2.
5.5.1 DroppIng block. comprising a hollow cylinder with a flat, closed bottom, with an inner diameter of
(25 ± 1) mm and an inner height of (65 ± 5) mm. The cylinder shall be fitted with a collar or pilot blocks to guide it
along the pilot bars dunng the test.
5.5.2 Plunger, with a bore hole along its longitudinal axis of diameter (1,6 ± 0,1) mm over a length of 10 mm
from the bottom and equal or wider above.
The difference in the diameter between the plunger and the cylinder shall be (0,20 ± 0,05) mm.
The plunger shall be provided with a circumferential groove about 5 mm from its lower end to accommodate filler that works up the side of the cylinder while in use. This groove shall be 2 mm to 3 mm wide and 1 mm to 2 mm deep.
5.5.3 Base plate (solid), rectangular with a minimum length of 150 mm, and minimum width of 100 mm, or circular with a minimum diameter of 140 mm, and a minimum height of 20 mm. Two (see Figure 1) or four (see Figure 2) upright pilot bars shall be mounted on the base plate to allow the dropping block and plunger to fall freely.
The maximum dropping height of (102 ± 1) mm shall be indicated by a stop on the pilot bars, preferably in combination with spacers to keep the pilot bars exactly parallel.
During compaction the apparatus shall be securely clamped or screwed onto a sturdy, non-flexible and even base (e.g., a concrete cube o pillar).
EN 1097-4:2008 (E)
The apparatus shall be dry; the use of lubricants is not permitted.
5.6 Vernier depth calliper or dial gauge, for measuring the height of the compacted filler.
NOTE The vernier depth calhper can be accommodated in grooves (i) in the upper ends of t pilot bars and a tare boring in the plunger. The dial gauge can be damped on the cross arm of a stand, on which the dropping block with plunger (empty for zero value setting) is placed for height measurement
The accuracy of the depth calliper or dial gauge shall be at least 0,01 mm.
5.7 Balance, accuracy 0,01 g.
5.8 Filter paper, (20 ± 5) gim2 in mass and (25 ± 1) mm in diameter.
5.9 Test sIeve, 0,125 mm size and suitable receiver,
6 Preparation of test portion
Reduce the size of the laboratory sample in accordance with EN 932-2. The test portion befoe drying shall have a minimum mass of 150 g. Dry the test portion at (110 ± 5) °C to constant mass and leave it to cool down in the desiccator for at least 90 mm.
Check the test portion for the presence of lumps and. if present. pulverise then carefully with a spatula. Mix the pulverised lumps.
Dry &eve the tiller using the 0.125 mm sieve. Retain all of the particles which pass the sieve.
7 Procedure
Determine the particle density of the filler in accordance with EN 1097-7. Carry out the determination of voids using three separate test specimens.
Insert a filter paper and the plunger into the empty cylinder and set the zero height of the cylinder with filter paper and plunger with the depth gauge calliper or dial gauge. Weigh the dropping block without the plunger, but with one filter paper, to an accuracy of 0,01 g and record the mass (m0). Remove the filter paper from the cylinder.
Place (10 ± 1) g of filler into the dropping block cylinder and spread evenly by gently tapping the dropping block on the table. Put the filter paper on the filler and carefully insert the plunger into the cylinder, taking care that the filler does not work up the side of the cylinder. Carefully press the plunger to the compact the filler,
Position the dropping block with filler and plunger over or between the pilot bars on the base plate. Raise the dropping block to the upper stop (the touch shall be as light as possible) and let it tall freely to the base. Repeat the procedure 100 times at intervals of approximately 1 s.
NOTE Automatc compaction is possible if it comphes with the requirements specified above
After 100 impacts, read the height (h) of the compacted filler to the nearest 0,01 mm, either by placing the depth calliper on the pilot bars or by taking the dropping block off the pilot bars and placing it under the dial gauge. Take the dropping block off the pilot bars (if not previously done) and carefully remove the plunger from the cylinder without disturbing the compacted bed of filler.
Weigh the cylinder with the filler and filter paper (m1) with an accuracy of 0.01 g and determine the mass of the compacted filler in7 = (m, – in0) g.
After each test, clean the apparatus thoroughly. Carry out the determination of in7 and h in triplicate and use a new amount of filler for every determination.EN 1097-4-2008 pdf download.
EN 1097-4-2008 pdf download
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