What is crank Length of reinforcement
Crank is a slight bending in bars at the lap so that maintains the clear cover even at the lap position. The rule that is generally practiced is that the slope of crank 1:10 & the minimum length of crank 300 mm.
Crank length of reinforcement
Formula of Crank length = (d1+d2+5)*10mm
Concrete Test: Slump test, compression test, split tensile test, soundness etc.
d1 =diameter of smaller bar
d2 = diameter of largest bar