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Casting of Mortar Cubes

The document describes a procedure to test the compressive strength of cement mortar cubes. Mortar cubes are made using a mix of cement, sand, and water. The cubes are compacted using vibration and cured in water for 24 hours. Their compressive strength is then tested to determine the strength of the cement.

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6K views2 pages

Casting of Mortar Cubes

The document describes a procedure to test the compressive strength of cement mortar cubes. Mortar cubes are made using a mix of cement, sand, and water. The cubes are compacted using vibration and cured in water for 24 hours. Their compressive strength is then tested to determine the strength of the cement.

Uploaded by

wajid
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Practical no#10

Object: Casting of Cement Mortar Cube to check compressive


strength.

Apparatus: Cube mould, Vibration machine, weight machine,


Measuring cylinder, Enamel tray, Trowel, Poking rod.

Materials: Sand , Cement, Water.


Theory: Compressive strength of cement is determined by compressive
strength test on mortar cubes compacted by means of a standard
vibration machine. Standard sand (IS:650) is used for the preparation of
cement mortar. The specimen is in the form of cubes 5cm* 5cm*5cm.
The Sand that is to be used should pass sieve no.20 retained on sieve
no.30.

Procedure:
1. Take 1 part of cement and 3 part of sand and mix them dry
thoroughly.
2. Add amount of water calculated from water cement ratio of 0.4 to the
dry mix of cement and sand and mix thoroughly for a minimum of 3
minutes and maximum of 4 minutes to obtain a mix of uniform color.
If even in 4 minutes uniform color of the mix is not obtained reject
the mix and mix fresh quantities of cement, sand and water to obtain
a mix of uniform color.
3. Place the thoroughly cleaned and oiled (on interior face) mould on
the vibrating machine and hold it in position by clamps provided on
the machine for the purpose.
4. Fill the mould with entire quantity of mortar using a suitable hopper
attached to the top of the mould for facility of filling and vibrate it
for 2 minutes at a specified speed of 12000400 per minute to
achieve full compaction.
5. Remove the mould from the machine and keep it in a place with
temp of 2720C and relative humidity of 90% for 24 hours.
6. At the end of 24 hrs remove the cube from the mould and
immediately submerge in fresh clean water. The cube be taken out of
the water only at the time of testing.

Calculation of weight of materials:

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