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Unformatted text preview: ssion tests, the regular size of cylinder and cubes and
the manner of moulding, capping and testing the specimens shall be in
accordance with Appendices B and E of *IS: 456-1957 except that an approved method of vibration may be used for compacting
7.5.2 Wherever required, representative
15 cm ( or 6 in ) cores shall
be drilled from the completed
and shall be prepared, capped
and tested in accordance
with Appendix B.
and soundness of such specimens shall be compared with the
results of similar fests on standard test cylinders taken from the same run.
7.6 Flexure Tests - For flexure tests, the size and shape of specimens
and the manner of moulding and testing shall be in accordance with Appendix C.
7.7 Failure to Meet Requirements - Should the test specimens fail
to show the desired uniform quality and characteristics,
given by the engineer-in-charge
to improve such concrete, shall be strictly
4.5 ) OF CONSISTENCY
CONSISTOMETER OF CONCRETE
METHOD BY SCOPE A-l.1 This appendix
crete using a V<+Bec
conical frustum into a
A-2. deals with the determination
which determines the time required
specimen in the shape cf a
cylinder. APPARATUS A-2.1 The Vee-Bee Consistometer a) A vibrator table resting
b) ;1 metal pot; ( see Fig. 1 ) consists upon elastic 34 support; of: IS : 457 - 1957
c) A sheet metal cone, open at both ends; and
d) A standard iron rod.
A-2.2 The vibrator table ( G ) is 380 mm long and 260 mm wide and is
supported on rubber shock absorbers at a height of about 305 mm above
Thz table is mounted on a base ( K ) which rests on three
rubber feet, and is equipped with an electricallv
mounted under it operating on either 65 volts ox 220 volts, three phase,
50 cycles alternating current.
A sheet mmtal cone ( B ) open at both ends
is p!aced in the metal pot ( A ) and the metal pot is fixed on to the vibrator
table by means of two wing-nuts (H ). The sheet metal cone is 30 cm
high and its bottom diameter is 20 cm and top diameter 10 cm. A swivel
arm holder ( M ) is fixed to the base and into this is telescoped another
swivel arm ( N ) with funnel ( D ) and guide-sleeve ( E ). The swivel arm
can be readily detached from the vibrating table.
The graduated rod
( J ) is fixed on to the swivel arm and at the end of the graduated arm a R Frc.1 VEX-l3m CONSISTOMETER. 3s TYPE VHR IS:457-1957
glass isc ( C ) is screwed.
of the scale on the rod records
the slumps of the concrete cone in ccntimetres
and the v&me of concrete
of the cone in the pot.
The standard iron rod is 20 mm
in diameter and 500 mm in length.
The electrical equipment
on the base of the consistometer
cox,ists of a fixed plug and connector for IS : 457 - 1957
the electric supply cable, plug and socket contacts for...
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This document was uploaded on 10/01/2013.
- Fall '13