Question

What is the minimum grade of concrete in CC pavement?

• A. M20
• B. M30
• C. M40
• D. M50

Hint:

For rigid pavement construction, M40 grade concrete is the minimum standard due to its superior flexural strength and durability under repetitive traffic loading.

Answer 1

The Correct Option is C

Step 1: Understand the purpose of CC pavements
Cement Concrete (CC) pavements are rigid pavements that rely on the flexural strength of concrete to distribute traffic loads. Hence, a higher concrete grade is essential for strength and durability.
Step 2: Refer to IRC and MoRTH guidelines
As per the IRC:15-2017 and MoRTH specifications:
- The minimum grade of concrete recommended for CC pavements is M40.
- M40 grade ensures durability under heavy traffic and weathering conditions.
Step 3: Evaluate the options
- M20 and M30 → Suitable for buildings or minor structures.
- M50 → Higher strength than required, used in high-load or specialized areas.
- M40 → Standard minimum for CC pavements.