Question

With reference to pavements, which of these following statements is not correct?

• A. Flexible pavements are more suitable than rigid pavements in regions where subgrade strength is uneven
• B. Rigid pavements are more suitable than flexible pavements in regions where subgrade strength is uneven
• C. Load carrying capacity of rigid pavements depends more on the properties of concrete than the strength of subgrade
• D. Compared to flexible pavements, rigid pavements are more affected by temperature variations

Hint:

Remember:
• Flexible pavement $\rightarrow$ Better for non-uniform subgrade.
• Rigid pavement $\rightarrow$ Depends mainly on concrete slab strength.
• Temperature stresses are significant in rigid pavements.

Answer 1

The Correct Option is B

Concept: Flexible pavements distribute wheel loads through successive layers and perform better where subgrade conditions vary. Rigid pavements possess high flexural rigidity and bridge minor weak spots, but they are generally not preferred where subgrade strength is highly uneven. The load carrying capacity of rigid pavements mainly depends on the flexural strength of concrete. Rigid pavements are also more susceptible to temperature stresses than flexible pavements.

Step 1: Examine the statements.
• Statement (A): Correct.
• Statement (B): Incorrect.
• Statement (C): Correct.
• Statement (D): Correct.

Step 2: Identify the incorrect statement. Hence, \[ \boxed{\text{Statement (B) is not correct}.} \] Therefore, the correct option is \[ \boxed{(B).} \]