Absorption Test of Stones | Crushing Test of Stones | Stones | Construction Materials | By Ashutosh Nautiyal and Akhand Dutta

Absorption Test of Stones (IS: 1124)

Stones

Requirements:- 

• The test pieces of stone which are crushed or broken and which are passed through 20 mm IS sieve and retained on 10 mm IS Sieve.   

• Apparatus such as a glass vessel, weighing balance, thermostatically controlled oven, desiccator, 1000 ml capacity measuring cylinder, 100 ml measuring cylinder, distilled water and two dry clothes must be available to perform the test. 

Procedure:- 

• The test piece weighing about 1 kg is washed to remove the dust particles.

• Then, it is immersed in distilled water in a glass vessel at room temperature(20 to 30°C)for 24 hours.

• The entrapped air is removed by gentle agitation(achieved by rapid clock-wise and anti-clockwise rotation of the vessel) soon after immersion and again at the end of the soaking period.

• The vessel is then emptied and the test piece is allowed to drain.

• The test piece is then placed on a dry cloth and the surface is dried with the cloth gently.

• When the first cloth removes no further moisture, it is transferred to a second dry cloth.

• The test piece is spread out not more than once on the second cloth and it is left exposed to the atmosphere away from sunlight or any other source of heat for not less than 10 minutes until it appears to be completely surface dry.

• The sample is then weighed (B).

• Then, the sample is carefully introduced in a 1000 ml capacity measuring cylinder and distilled water is poured by means of 100 ml capacity measuring cylinder until the level of water in the larger cylinder reaches 1000 ml mark(while taking care to remove the entrapped air).

• The quantity of water added to the sample is recorded in ml or expressed in gram weight (C).

• The water in the larger cylinder is then drained and the sample is carefully taken out and dried in an oven at 100 to 110°C for not less than 24 hours.

• It is then cooled in a desiccator to room temperature and weighed (A).

• The room temperature during the test is recorded.

• Finally, the Apparent Specific Gravity is calculated by using the formula specified below:-

Apparent Specific Gravity

          where A is the weight of oven-dry test piece (g)
          

          C is the quantity of water added in 1000 ml jar containing the test piece (g)

• The Apparent Specific Gravity shall be expressed as a numerical value for the saturated surface-dry sample at the recorded temperature and it shall be the average of three determinations.

• Similarly, Water Absorption is calculated by using the formula specified below:-

Water Absorption

   


          where A is the weight of oven-dry test piece (g)
     
          B is the weight of saturated surface-dry test piece (g)

• The Water Absorption shall be expressed as a percentage by weight of the oven-dry sample and it shall be the average of three determinations.

•  Now, the Apparent Porosity is calculated by using the formula specified below:-  

Apparent Porosity

            where A is the weight of oven-dry test piece (g)                                 

            

            B is the weight of saturated surface-dry test piece (g)

            C is the quantity of water added in 1000 ml jar containing the test piece (g)

• The Apparent Porosity shall be expressed as a percentage and shall be the average of three determinations.

• Similarly, the True Porosity is calculated by using the formula specified below:-

True Porosity

*Self Typed
*Source- Internet, Books, Self-Analysis