why 1.25 factor is to be multiplied to cylindrical strength
of concrete while getting the equvalent cubical strength of
concrete?
Answer Posted / umair majeed
Governing factor of application of such factor is h/d ratio of both the cube and cylinder specimens. As h/d ratio increases, strength decreases. h/d ratio of cylinder is twice to that of cube. Moreover, when load is applied on cube specimens, compression imposed by platens of testing machine enhance the confinement which in turn increases the compressive strength of cubes. It is reported that for 3000psi concrete, ratio of strength of cylinder to that of cube is around 0.76. Hence whenever cube strength is taken as multiple of cylinder strength then a factor of 1.25 is incorporated to get approximate results.
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