Question

What is the limiting principal tensile stress in prestress uncracked concrete member of M25 grade?

• A. 1 MPa
• B. 1.5 MPa
• C. 2 MPa
• D. 2.5 MPa

Answer 1

The correct option is A 1 MPa

The limiting principal tensile stress in an uncracked prestressed concrete member is given by
$f_t=0.24\sqrt{f_{ck}}=0.24\sqrt{25}=1.2MPa$