Question

Which of the following statements is/are INCORRECT?
 

• A. Bitumen having lower softening point is preferred in warm climate regions.
• B. The viscosity of bitumen influences the mixing and compaction of bituminous mix.
• C. The air voids in the range of 3\% to 5\% are required to arrive at the optimum bitumen content.
• D. The purity of bitumen can be determined using Solubility Test.

Hint:

In hot climates, always use bitumen with a high softening point to prevent surface distress.

Answer 1

The Correct Option is A

Option (A): Incorrect. In warm climate regions, bitumen with a higher softening point is desirable to prevent deformation and bleeding under high temperatures. A lower softening point would cause the pavement to fail prematurely.
Option (B): Correct. The viscosity of bitumen affects both mixing and compaction temperatures. A proper viscosity ensures good coating of aggregates and workability during paving.
Option (C): Correct. Air voids in the range of 3–5% ensure that the pavement has sufficient durability and strength while maintaining resistance to deformation.
Option (D): Correct. The solubility test determines the proportion of pure bitumen in a sample and is used to assess the quality and presence of impurities.