Concept: Tensile strength of the concrete: As per IS 456: 2000, the estimated flexural tensile strength ( fcr ) of concrete is given by: Flexural Tensile strength =fcr=0.7√fck Where fck = Characteristic strength of the concrete in N/ mm2 Calculations: fck=36N∕mm2 Flexural Tensile strength, fcr=0.7√36 fcr=0.7×6 fcr=4.2N∕mm2