What are the limiting value of coefficient of variation of compressive stress,tensile strength, flexural strength of concrete in satastical analysis?

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Fatimah H. Naser Popular answer

It is recommended that the variation ratio should not exceed 10%

Sameh Yehia

indirect tensile strength = 1/10 of compressive strength (early state)

indirect tensile strength = 1/5 of compressive strength (lately state)

direct tensile strength = 0.85 of indirect tensile strength

shear strength = 10 to 12% of comprssive strength

flexural strength = 14% to 22% of comprssive strength

Fatimah H. Naser

Joanna J. Sokołowska

Sameh Yehia, could you tell me what is the particular source of those recomentations?