It is about 13.5 N/mm2
The compressive strength of M25 concrete at 7 days will be between 6-7.5 N/mm2 .
The compressive strength of 7 days shall be about 70% of the 28-days compressive strength. If your compressive strength at 28-days is 25 MPa, then the 7-days compressive strength expected to be (0.70X25MPa)=17.5 MPa Regards, Sami
3/4 of its strength
the strength that it has gained is the main thing, but usually 5 to 7 days as a rough guide.
The strength of M20 concrete for 7days will be 63%( say 12.6) of 28days strength i.e. 20N/sq mm
for checking the mix design for concrete, we need to initially prepare the mix n take samples n do cube tests to find the compressive strength n find out if desired strength is obtained for 7 days & 28 days strength. if desired strength is not obtained v need to adjust the mix proportions. its actually a trial n error method.
The compressive strength of M25 concrete at 7 days will be between 6-7.5 N/mm2 .
The compressive strength of 7 days shall be about 70% of the 28-days compressive strength. If your compressive strength at 28-days is 25 MPa, then the 7-days compressive strength expected to be (0.70X25MPa)=17.5 MPa Regards, Sami
The compressive strength of M20 concrete at 28 days typically falls in the range of 20 to 25 megapascals (MPa), which is equivalent to 2900 to 3600 pounds per square inch (psi). M20 is a mix designation for concrete, where "M" stands for "mix" and the number 20 represents the characteristic compressive strength of the concrete mix in MPa. Please note that the actual compressive strength of M20 concrete can vary depending on several factors, including the quality of materials used, the water-cement ratio, the curing conditions, and the testing procedures. To ensure the desired strength, it's essential to follow the recommended mix proportions and proper construction practices during the preparation, placing, and curing of the concrete. Additionally, testing of concrete samples is typically conducted in a laboratory environment to determine the 28-day compressive strength accurately.
3/4 of its strength
Seven days strength of any concrete usually comes 67% of 28 day strength. So 7 day strength of M30 may be .67*30=20.10 MPa
Seven days strength of any concrete usually comes 67% of 28 day strength. So 7 day strength of M30 may be .67*30=20.10 MPa
525 divided by 7 days in a week equals 75 weeks.
the strength that it has gained is the main thing, but usually 5 to 7 days as a rough guide.
concrete strenght gain at first 7 days much increase so we consider 7days strenght
33 Mpa...for 43 grade cement
The strength of M20 concrete for 7days will be 63%( say 12.6) of 28days strength i.e. 20N/sq mm