It is the bearing capacity in N/mm2 when tested on 21 day on a hydraulic testing m/c When we tested this grade concrete cubes on 28th day the compressive strength value have to come 35 N/mm2.
1:5:10 - M5
1:4:8 - M7.5
1:3:6 - M10
1:2:4 - M15
1:1.5:3 -M20
1:1:2 - M25
From M30 onwards Design mix followed.
concrete c35 - 1:1,5:2,5 (cement,sand,aggregate)
rades
how much tensile strength of M20 grade concrete at 28 Days
500psi
3000 psi concrete weighs Approx 3900 Lb/yd3
concrete c35 - 1:1,5:2,5 (cement,sand,aggregate)
rades
It is exactly 4351 psi but generally referred to as 4500 psi.
how much tensile strength of M20 grade concrete at 28 Days
500psi
3000 psi concrete weighs Approx 3900 Lb/yd3
st4 is just a standard type concrete probably comparable to c40 structural concrete, pav 2 is the equivalent to c35 concrete with air bubbles, mostly used in paving works
3000 psi 3500?
If is standard concrete it is usually 3000 psi mix
Generally speaking, concrete is rated anywhere from 2000 psi to 10,000 psi. Of course if you do NOT use the proper ratio of aggregate (usually sand) to cement and water you can make concrete that is even weaker. When concrete is ordered from a delivery company, you specify the strength of he mix or pour that you want.
4500
5 sacks of cement per 1 yard of concrete