ISO 1920-2:2016 pdf free download.Testing of concrete Part 2 Properties of fresh concrete.
is acceptable , provided the clamping arrangement can be fully released without movement of the mould
or interference with the slumping concrete .
The mould shall be visually checked prior to each use to assure that it is clean and is not damaged or dented . The cone shall be checked annually to ensure that its dimensions and conditions remain within tolerances straight , made of steel , having a circular cross-section with a diameter of 16 mm 1 mm , 600 mm + 5 mm in length , and with rounded ends . The rod may be extended with
handle of plastic conduit , provided that the overall length does not exceed 1 000 mm
The tamping rod shall be checked annually to ensure that its dimensions and conditions remain within
olerances
m ( optional ) , made of a non-absorbent material not readily attacked by cement paste
The funnel shall consist of two co-axial conical frustums having a common diameter of 100 mm , the
ends being of greater diameter , one frustum to act as a filling funnel and the other as a collar to enable
e funnel to be located on the outer surface of the mould
The funnel shall be checked annually to ensure that its dimensions and conditions remain within
tolerances .
graduated from 0 mm to 300 mm , at intervals not exceeding 5 mm , with the zero point
being at the extreme end of the rule
t , rigid , flat , non-absorbent and smooth plate or other surface on which to
place the mould
with a square blade .
of rigid construction and made from a non-absorbent material not readily
attacked by cement paste
It shall be of appropriate dimensions such that the concrete can be thoroughly remixed , using the
square-bladed sh
Place the Vebe meter ( consistometer ) on a rigid horizontal base free from extraneous vibration and
shock . Make sure that the container ( Figure 3 , item 1 ) is firmly fixed to the vibrating table ( Figure 3 ,
item 7 ) by means of the wing nuts ( Ligure 3 , item 8 ) . Dampen the mould ( Figure 2 , item 2 ) and place it
in the container . Swing the funnel ( Egure 3 , item 4 ) into position over the mould and lower the funnel
on the mould . Tighten the screw ( Ligure 3 , item 6 ) so that the mould cannot rise from the bottom of the
container
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subsequent operations , ensure that the mould ( Figure 3 , item 2 ) does not rise or move until
and do not allow any concrete to fall into the container ( Figure 3 , item 1 )
From the sample of concrete obtained in accordance with 4.2 , immediately fill the mould in three
layers , each approximately one-third of the height of the mould when compacted Tamp each layer with
25 strokes of the tamping rod Uniformly distribute the strokes over the cross-section of each layer . For
the bottom layer , this will necessitate inclining the rod slightly and positioning approximately half the
strokes spirally toward the centre . Tamp the second layer and the top layer each throughout its depth ,
so that the strokes just penetrate into the underlying layer In filling and tamping the top layer , heap the
concrete above the mould before tamping is started
If necessary , add further concrete to maintain an excess above the top of the mould throughout the
tamping operation . After the top layer has been tamped , loosen the screw ( Ligure 3 , item 6 ) , raise and
swing the funnel ( Figure 3 , item 4 ) through 90 and tighten the screw ( Eigure 3 , item 6 )
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off the concrete level with the top of the mould with a sawing an
motion of the tamping
remove the mould ( Eigure 3 , item 2 ) from the concrete by raising it
in a vertical direction ,
the handles . The operation of raising the mould shall be performed
5s by a steady upward
lift with no lateral or torsional motion being imparted to the concrete .
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concrete shears las shown in Eigure 4 b ) l , collapses as shown in Figure 4 c ) l , or slumps to the
It that it touches the wall of the container ( Figure 3 , item 1 ) , this information shall be recorded
If the concrete has not slumped into contact with the wall of the container ( Figure3 , item 1 ) and a true
slump , as shown in Figure4 a ) has been obtained , the fact shall be recorded
Swing the transparent disc
screw
item 6 ) , loosen the screw ( Eigure 3 , item 15 ) and very carefully lower the disc u
contact with the concret
When the disc ( Figure 3 , item 3 ) just touches the highest point of the concrete without disturbing it ,
tighten the screw ( Figure 3 , item 15 ) . When there is a true slump , the value of the slump shall be read
from the scale ( Figure 3 , item 9 ) and the value recorded .
consisting of a flat plate with a plan area of 700 mm t 2 mm x700 mm t 2 mm
which concrete can be placed , hinged to a rigid base onto which it can fall from a fixed height ( E
Figure 7 )
he flow-table top shall have a metal surface with a minimum thickness of 2 mm and a flatness of
within 1 , 5 mm as defined by ISO 1101 : ( see also IS0 1920-3 : 2004 , Annex B ) . The metal surface shall not
be readily attacked by cement paste or be liable to rusting . The mass of moving part may be modified as
16 kg + 0 , 5 kgand may be attached using a pin-hinge to allow the weight to be checked . The construction
of the plate shall be such as to prevent distortion of the upper surface . The tabletop shall be hinged to
the base in such a way that no aggregate can become trapped easily between the hinged surfaces
The centre of the table shall be scribed with a cross , the lines of which run parallel to the edges of the
plate and with a central circle with a diameter of 210 mm + 1 mm
At the front corners of the plate , two hard , rigid blocks shall be firmly attached to the underside . They
should be non-absorbent and should not deform when wet . These stops shall transfer the load of the
tabletop to the base without distorting the table . The base frame shall be so constructed that this load
is then transferred directly to the surface on which the apparatus is placed , so that there is minimal
tendency for the tabletop to bounce when allowed to fall freely
Footrests shall be provided to assist in stabilizing the table when in use .
The fall height of the tabletop , measured at the centre line of the front edge of the top place , shall be
limited to 40 mm + 1 mm by means of one or more stops
A handle or lifting mechanism shall be provided for lifting the tabletop to ensure that the top is lifted
without jerking and allowed to fall freely over the entire lifting height .