The compressive strength of concrete can be determined by the concrete
cube compression test. In order to make the test concrete cube, the
mould shall be placed on a rigid horizontal surface. The concrete
shall be placed in the mould in layers approximately 50mm depth and each
layer shall be compacted compacting bar. The minimum number of strokes
per layer required to produce full compaction will depend upon the workability
of the concrete but in no case sall be leass than 35 strokes per layer
for 150mm cubes. After the top layer has been compacted, it shall
be levelled to the top of the mould with a steel float, and the sides of
the mould shall be wiped clean.
| Concrete Cube Making Procedures: |
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| Applying mould oil |
Filling the 1st layer fresh concrete. Each layer should be approximately
50mm deep |
Compacting the 1st layer with compacting bar |
Filling the 2nd layer fresh concrete |
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| Compacting the 2nd layer |
Filling the 3rd layer fresh concrete and then compacted to the required
height |
Levelling the top surface with a steel float |
Cleaning the sides of the mould |
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| A pair of 150mm concrete cube |
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