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A construction firm has decided to use burnt clay bricks of class 20 and above (as per IS 1077 : 1992) for the construction of a residential complex. The table below gives the details of Samples with Id (S1, S2, S3, S4, and S5) taken from five different suppliers. The criteria to be adopted are the percentage of water absorption and average compressive strength of bricks corresponding to bricks of class 20 and above. Select the Id of the samples which can be recommended for use in brick wall construction. Id Water absorption (%) Average compressive strength (kN/m2) S1 18 17500 S2 20 21000 S3 12 20000 S4 10 14000 S5 15 27000

A construction firm has decided to use burnt clay bricks of class 20 and above (as per IS 1077 : 1992) for the construction of a residential complex. The table below gives the details of Samples with Id (S1, S2, S3, S4, and S5) taken from five different suppliers. The criteria to be adopted are the percentage of water absorption and average compressive strength of bricks corresponding to bricks of class 20 and above. Select the Id of the samples which can be recommended for use in brick wall construction. Id Water absorption (%) Average compressive strength (kN/m2) S1 18 17500 S2 20 21000 S3 12 20000 S4 10 14000 S5 15 27000 Correct Answer S3 and S5 only

Concept:

According to IS 1077 (1992):

  • The bricks, when tested in accordance with the procedure laid down in IS 3495 ( Part 2): 1992 after immersion in cold water for 24 hours, water absorption shall not be more than 20 percent by weight up to class 12.5 and 15 percent by weight for higher classes. 

Explanation:

Given data:

Class of bricks = 20 and above

So, according to IS 1077 (1992), water absorption shall not be more than 15 percent by weight for higher classes(Above class 12.5).

Hence, the Id of the samples which can be recommended for use in brick wall construction is S3 and S5.

Additional Information

  • IS 1077 (1992): - Common Burnt Clay Building Bricks -Specification
  • IS 3495 ( 1992):-   Methods of tests of burnt clay building bricks 
    • Part 1 - Determination of compressive strength
    • Part 2 - Determination of water absorption 
    • Part 3 - Determination of efflorescence
    • Part 4 - Determination of warpage

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