Check the coding and numbers of cubes received.
Enter the details of cubes in the testing register.
Weight the cubes and note the figures in register.
Inform the concerned person about any damages.
Check the dates of casting and testing for 7 and 28
days.
Place the cubes in testing machine so that the load is
applied to the opposite side of the cube as cast, i.e., not on top and bottom.
(opposite sides of the cube surfaces are in contact with sides of the metal
mould)
Compression Testing Machine
Apply the load without interruptions and increase the
load continuously, at a rate of approximate 400 kg/min until the resistance of
the specimen breaks down and no additional can be sustained.
Record the maximum load applied to the specimen.
Observe the appearance of concrete connected with the
failure and note the same.
Calculate compressive strength
= (maximum load at failure) / (contact area of the
cube)
Take average strength represents the strength of
concrete of a particular portion of the structure.
Prepare the test report and submit in higher
authorities.
Cubes of the same lot should not vary.
Inspect the particular portion of the structure
immediately if results are considerably below normal.
