Curing
After moulding, the specimens are stored on the
site free from vibration under damp matting, sack or
other similar material for 24 hours from the time of
addition of water to the other ingredients.
The temperature of place of storage was within the
range of 220c to 32oc. After a period of 24 hours cubes
were marked. After removing from the moulds, cubes
were stored in clean potable water at a temperature of
240c to 300c until they were transported to the testing
laboratory.
In flexural test the beam specimen is placed in the
machine in such a manner that the load is applied to
the upper most surface as cast in the mould .All beams
are tested under two points in Universal testing
machine of 60 tones capacity .The load is applied at a
rate loading 10cm x10cm x50cm specimens. The load
is increased until the specimen failed and the failure
load is recorded.
The flexural strength is calculated from the equation.