A Vision To Clear Solutions.
1.
Concrete shall be mixed as near as
possible to the place of deposit and no additional water shall be added to the
concrete after it has left the mixer. The concrete shall be to site by
manually.
2.
Concrete shall be placed and
compacted while fresh and before it has taken its initial set. This shall be
performed at the latest within 45 minutes after mixing, which is defined as the
time at which the cement is added to the aggregates.
3.
The arrangements for placing concrete
shall be such that the material may be conveniently handled and placed in the
required position without contamination, re-handling or segregation and at the
required workability.
4.
Concrete shall be compacted during
placing by immersion vibrators. The stick vibrators shall be operated
vertically. The fastening of vibrators to the reinforcement or other built in
items shall not be permitted. Concrete shall not be re-vibrated to remove or
reduce cracks.
5.
Concrete shall not be allowed to fall
freely from a height which may cause damage and distortion of the
reinforcement, other embedded items or formwork, preferably 1.0m and below. In
no case shall concrete be allowed to fall freely from a height greater than
1.50m.
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