I wouldn't count anything under 40 MPA as "high strength concrete" at all. Thats where high strength concrete starts for me. High strength concrete mixes can go

I wouldn't count anything under 40 MPA as "high strength concrete" at all. Thats where high strength concrete starts for me. High strength concrete mixes can go up to 180-200 MPA although thats some crazy specialty stuff for very niche uses. 25 mpa concrete is "i'm doing my driveway" concrete or "I bought a bag at home depot" concrete not high strength concrete.