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Procedure for Determination Compressive Strength test of Cement

Er. Parbhakar Dwivedi
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Theory:

The compressive strength test is the final check on the quality of cement the compressive strength is measured by determining the compressive strength of cement mortar cubes of 1:3 proportions. The find aggregate used is the standard sand specified by IS 650. The compressive test enables also to distinguish rapid hardening cement from low heat and ordinary cement. The O.P.C.is now being classified as 33 Gr. O.P.C., 43 Gr. O.P.C and 53 O.P.C. depending on strength of cement. C.R.R.I has developed curves for concrete compressive strength v/s water cement ratio corresponding to the 7 and 28 days compressive strength of cement. The compressive strength of cement enables us to distinguish of different strength and maximum use can be made of high strength cement.

Aim: To determine the compressive strength of cement

Significance: Compressive strength of cement helps in determining grade of cement, in calculationing mix designing proportioning of concrete etc.

Apparatus

  • Vibration machine
  • Poking rod
  • Cube mould of 70.6 mm size
  • Gauging Trowel
  • Balance, Weights & Tray
  • Graduated glass cylinder

Procedure:

(1) Take cement 200 gm, standard sand 600 gm and water = ( P/4 + 30) percent of combined mass of cement and sand, where P is the percentage of water required to produce a paste of standard consistency determined as described in IS:4031 (PART IV)-1988.

(2) Place mixture of above cement and sand (1:3) on a tray, mix it dry with a trowel for one minute and then with water (as per step (1) of procedure) until the mixture is of uniform colour.

Note: The time of mixing shall in any event be not less than 3 minutes and should the time taken to obtain a uniform colour exceed 4 minutes, the mixture shall be rejected and the operation repeated with a fresh quantity of cement, sand and water.

  • (1) Properly oil the interior faces and bottom of mould which should be water tight.
  • (2) Place the assembled mould on the table of vibration machine and hold it firmly in position by means of a suitable clamp. Attach a hopper of suitable size and shape securely at the top of the mould to facilitate filling and this hopper shall not be removed until the completion of vibration period.
  • (3) Immediately after mixing the mortar as in step (2) of procedure, place the mortar in the cube mould and rod with the poking rod 20 times in about 8 seconds to ensure elimination of entrapped air to prevent honey combing. Place the remaining quantity of mortar in the hopper of the cube mould and rod again as done for the first layer.
  • (4) Compact the mortar by vibration machine for 2 minutes at the specified speed of 12000 +/- 400 vibrations per minute.
  • (5) At the end of vibration remove mould together with the base plate from the machine and finish the top surface of the cube in the mould by smoothening the surface with the blade of trowel.
  • (6) Keep the filled mould in moist cloth for 24 hours after completion of vibration.
  • (7) At the end of this period remove them from the mould and immediately submerge in clean fresh water.

Test sets of three cubes for compressive strength at 3, 7 & 28 days in compression testing machine The cubes shall be tested on their sides without any packing between the cube and the steel plates of the testing machine Load shall be steadily and uniformly applied at the rate of 35 N/mm2 per minute.

The load when the cube fails shall be noted and divided by cross sectional area of the cube and record the results.

Reporting:

Sample no Date of casting Date of testing Days Strength in kg/cm2 orN/mm2 Average strength
1 3
2 3
3 3
4 7
5 7
6 7
7 28
8 28
9 28

Limit: Minimum compressive strength in N/mm2 for different types of cement at different ages:

Age in days 33 grade 43 grade 53 grade
3 16 N/mm2 23 N/mm2 27 N/mm2
7 22 N/mm2 33 N/mm2 37 N/mm2
28 33 N/mm2 43 N/mm2 53 N/mm2

FORMAT FOR COMPRESSIVE STRENGTH TEST OF CEMENT IN SEPARATE TOPICS

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