Question

The spacing between contraction joints for the 3.5 m slab width having thickness of 20 cm and f = 1.5 for plain cement concrete slab is ________ m.
[Assume unit weight of cement concrete = 2400 kg\cu.m and allowable stress in tension in cement concrete = 0.8 kg/sq.cm

• A. 4.44
• B. 8.88
• C. 22.22
• D. 6.4

Answer 1

The correct option is A 4.44

Spacing between contraction joint for PCC is given by
$L_C=\frac{{2\sigma }_c}{\gamma f}=\frac{2\times 0.8\times {10}^4}{2400\times 1.5}=4.44m$