a. 1ST class BW in C.M 1:3 in foundation up to plinth

b. External plastering, 20mm thick in C.M (1:2) (including plinth steps)

c. 150mm thick DPC in cement concrete 1:1.5:3

d. R.C.C M25 grade in slab, lintel and plinth steps.

(Using long wall short wall method)

∵ 1.8 is half of span 3.6 ∴ The curved circle is semicircle with an inner radius 1.8m.

∴ Mean radius $r_m =1.8+0.15 = 1.95m$

Center line of curved portion

$=π×r_m \\ =π×1.95 = 6.12m$

Continuative to semicircular as short wall

= 2.40+0.15 =2.55m

Long wall = 3.6+0.3 =3.9