Compressive Strength of Concrete Cubes

To determine the Compressive Strength of Concrete Cubes

Apparatus

Compression testing machine

Procedure

1)Remove the specimen from water after specified curing time and wipe out excess water from the surface

2)Take the dimensions of the specimen to the nearest 0.2mm.

3)Clean the bearing surface of the testing machine.

Compressive Strength of Concrete Cubes
Compressive Strength of Concrete Cubes

4)Place the specimen in the machine in such a manner that the load shall be applied to the opposite sides of the cube as cast.

5)Align the specimen centrally on the base plate of the machine.

6)Rotate the movable portion gently by hand so that it touches the top surface of the specimen.

7)Apply the load gradually without shock and continuously at the rate of 140 kg/cm2/min till the specimen fails.

8)Record the maximum load and note any unusual features in the type of failure.

Calculations

Size of the cube=         mm

Area of the specimen=            mm

Characteristic compressive strength (fck) =   failure laod/area

Expected maximum load =  fck * area * factor of safety

Range to be selected=          KN

Maximum load applied=             KN

Compressive strength=               Load in N /area in mm2    

Compressive of concrete cubes at 7 ,14 and 28 days can be tested.

 

TESTS ON FRESH CONCRETE

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