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According to IRC (Indian Roads Congress), what is the maximum stripping value of aggregate to be used in bituminous construction like surface dressing?
1. 12%
2. 1%
3. 25%
4. 45%

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Correct Answer - Option 3 : 25%

Concept:

Stripping value of aggregate:

  • Good adhesion between the aggregate surface and bitumen film is mandatory for a durable bituminous pavement.
  • Disbanding of bitumen film from the surface of the aggregate in the presence of water or moisture is usually known as stripping.
  • The stripping value is defined as the ratio of the average uncovered or stripped area observed visually to the total area of aggregates in each test, expressed as a percentage.

Stripping value = (Uncovered surface area of aggregate by visual examination) / (Total surface area of aggregates)

According to IRC (Indian Roads Congress), the maximum stripping value of aggregate:

  • Indian Road Congress (IRC) has specified the maximum value of 25% for aggregates to be used in bituminous road construction.
  • Generally, the stripping value of less than 5% is preferred for road aggregates.
  • The maximum value suggested by IRC is 10% for aggregates used in open-graded premix carpet.

 

​Hence, According to IRC (Indian Roads Congress), the maximum stripping value of aggregate to be used in bituminous construction like surface dressing is 25%.

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