This Part of this British Standard describes a
method for making test beams of nominal
sizes 150 mm × 150 mm × 750 mm long
and 100 mm × 100 mm × 500 mm long out of fresh
concrete. The method applies to plain and
air-entrained concrete made with lightweight,
normal weight and heavy aggregates having a
nominal maximum size not exceeding 20 mm
for 100 mm × 100 mm × 500 mm long beams and 40
mm for 150 mm × 150 mm × 750 mm long beams.
This method does not apply to aerated concrete, very
stiff concrete, which cannot be compacted by
vibration alone, and no-fines concrete.
NOTE The titles of the publications r
Construction and assembly.
The sides and
ends of the mould shall be manufactured from
ferrous metal having a hardness value of at least 90
Rockwell (scale B) when determined in accordance
with BS 891. The mould shall include a removable
ferrous metal base plate. All parts of the mould shall
be robust enough to prevent distortion. Before
assembly for use, the joints between the sides and
ends of the mould and between the sides and the
base plate shall be thinly coated with oil or grease to
prevent loss of water.
The sides and ends of the
mould when assembled shall be positively located
and the whole assembly rigidly held together in
such a manner as to prevent leakage from the
mould. The internal faces of the assembled mould
shall be thinly coated with release agent to prevent
adhesion of the concrete.
The sides and ends of the mould shall be clearly
marked before use with a reference code to enable
each mould to be correctly assembled and, where
appropriate, the beam to be marked for