For Portland cement of 43 grade, the 28-day mean compressive strength should exceed:
Correct Answer: C. 43 MPa
🏛️ 28-Day Strength of 43-Grade Portland Cement
The grade designation of Portland cement directly states its minimum 28-day compressive strength. 43-grade cement must attain a 28-day mean compressive strength of at least 43 MPa when tested per IS 4031. The other two standard grades are 33 MPa (33-grade) and 53 MPa (53-grade).
28-day strength must exceed 43 MPa — option C.
Key takeaway
The grade number = minimum 28-day strength in MPa: 33-grade → 33 MPa, 43-grade → 43 MPa, 53-grade → 53 MPa.