Penetration test on bitumen is used for determining its

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BPSC AE Paper 6 (Civil) 14 Oct 2022 Official Paper
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  1. grade
  2. ductility
  3. viscosity
  4. temperature susceptibility

Answer (Detailed Solution Below)

Option 1 : grade
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Explanation:

Penetration test:

  • Hardness of bitumen is obtained by the penetration test.
  • It measures the distance a standard blunt pointed needle will vertically penetrate a sample of material at 25°C, the load being 100 gram and time of application of load being 5 seconds.
  • The unit of penetration is 1/10 mm. Thus 80/10 grade bitumen means 8 - 10 mm penetration.
  • 30/40 and 80/100 grade bitumen are more commonly used, depending upon bitumen construction type and climate conditions.

Important Points

  • Grade of bitumen is decided on the basis of the penetration test. If the grade of bitumen is A-30 then it means this bitumen is manufacturing from Assam petroleum and penetration value is 3 mm. If the grade is S-30 then this bitumen is manufactured from other than Assam petroleum.
  • In hot climate, a lower penetration grade bitumen like 30/40 bitumen is preferred.
  • Tar is soft, hence penetration test is not used in the case of tar.
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