Generally strength of concrete measured in psi (pound force per square inch in USA) MPa (mega pascal) in India and other country. MPa in another terms represented as N/mm2. And 1MPa = psi. In this topic we have to find compressive strength of M20 concrete, if it achieve strength 20MPa or 2900 Psi by cube test buy CTM machine, other than it rejected, .
The compression testing machines tested for high stability meet the stringent requirements of the: EN 123904 | BS 1881:115 | DIN 51220 | UNI 6686, part 3 | NF P18411 | UNE 83304 | ASTM C39 | AASHTO T22. These four columns prestressed frames are manufactured with specific quality features (processing, tolerances), piston/cylinder group, spherical seat, compression platens, distance pieces .