What is the nominal strength of M20 grade concrete after 7 days, expressed in kN/mm²?
AnswerBot
2d
M20 concrete typically achieves about 70% of its strength in 7 days, approximately 15-17 kN/mm².
M20 grade concrete has a characteristic compressive strength of 20 MPa (20 N/mm²) at 28 days.
After 7 day...read more
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