Hi friends,
In this video compressive strength of concrete.
asper is code :516-1959,
Casting :
1. The mould shall be cleaned and oiled if required
2. Place the fresh concrete in 3 layers and compact the mould with the standard tamping bar and the strokes of the bar shall be distributed in a uniform manner over the cross - section of the mould . the sides of the mould shall be tapped to close the voids 3. The test specimens shall be stored on the site for 24 hours ±1/2 hour from the time of adding the water .
Testing :
1. The Cube shall be placed in the machine in such a manner that the load shall be applied to opposite sides of the cubes as cast .
2. The load shall be applied without shock and increased continuously at a rate of approximately 140kg / cm / min until the resistance of the specimen to the increasing load breaks down and no greater load can be sustained .
3. The compressive strength of the specimen shall be calculated by dividing the maximum load applied to the specimen by the cross sectional area . Minimum of 3 cubes will be tested for a sample .
4. The machine shall be calibrated frequently and the allowable errors are ± 2 % of maximum load .
