just a follow up questions for https://www.engineersheaven.org/...-M20-/-M25-Concrete?
1. What happens if water–cement ratio is increased?
2. What is minimum grade of concrete for RCC as per IS code?
3. Where is M20 generally used and where M25?
4. What test is done on fresh concrete at site?
5. What test is done on hardened concrete?
6. What if cube strength fails at 28 days?
7. What is curing and why is it important?
8. What is the typical curing period?
9 Can M20 be used for columns?
Answer:
Workability increases
Strength decreases
Higher chances of cracks and permeability
Key line:
2. What is minimum grade of concrete for RCC as per IS code?Excess water reduces concrete strength and durability.
Answer:
M20 is the minimum grade of concrete for reinforced cement concrete as per IS 456.
Answer:
M20: Low-rise residential slabs, beams, footings
M25: Columns, beams, slabs of multi-storey buildings and heavily loaded members
Answer:
Slump test to check workability
Answer:
Compressive strength test (cube test)
Answer:
Review mix design and curing
Check site practices
Conduct core cutting test if required
Take corrective measures as per engineer’s decision
Answer:
Curing is the process of maintaining moisture and temperature to allow proper hydration of cement, which improves strength, durability, and crack resistance.
Answer:
Minimum 7 days for OPC
Generally 14–28 days for structural members
Answer: Technically yes for low loads, but M25 is preferred for better strength and durability.
