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.
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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
The main difference between concrete grade C35 and C35A lies in their composition. C35 concrete is a standard concrete mix with a minimum strength of 35 megapascals (MPa), while C35A concrete is a special mix that includes air-entraining agents to improve workability and durability. The inclusion of air-entraining agents in C35A helps to increase the concrete's resistance to freeze-thaw cycles and reduce the risk of cracking. Overall, C35A is more suitable for applications where improved durability and workability are required.
how much tensile strength of M20 grade concrete at 28 Days
500psi