Question

The split tensile strength of $M15$ grade concrete when expressed as a percentage of its compressive strength is

• A. $10$ to $15\text{\%}$
• B. $15$ to $20\text{\%}$
• C. $20$ to $25\text{\%}$
• D. $25$ to $30\text{\%}$

Answer 1

The correct option is B $15$ to $20\text{\%}$

Split tensile strength $=0.7\sqrt{f_{ck}}$
$f_{ck}=15Mpa$
$\text{\%}$ of split tensile strength with respect to compressive strength
$f_{ck}=\frac{0.7\sqrt{f_{ck}}}{f_{sp}}\times 100\text{\%}=\frac{0.7\sqrt{15}}{15}\times 100=18\text{\%}$