Concept:

Dry volume of cement mortar = 1.33 × wet volume of cement mortar

Bulk density of cement = 1440 kg/m3 

Weight of 1 bag of cement = 50 kg

Calculation:

Given, L = 5 m, H = 3.5 m, T = 0.3 m, Plaster thickness = 0.012 m

Plaster required for both side of wall = 2 × 5 × 3.5 × 0.012 = 0.42 m3 

Dry volume of cement mortar = 1.33 × 0.42 = 0.5586 m3 

Volume of cement required = 0.5586/4 = 0.13965 m3 

Cement bags required = 0.13965/50 × 1440 = 4 bags

Concept:

Year’s purchase is defined as capital sum required to be invested in order to receive an annuity of Re 1.00 at a certain rate of interest.

Sinking Coefficient = $\mathrm{S}=\frac{{\mathrm{i}}_{\mathrm{s}}}{(1+{\mathrm{i}}_{\mathrm{s}}{)}^{\mathrm{n}}-1}$ 

Year’s purchase = $\frac{1}{\mathbf{i}+\mathbf{s}}$ (Put i and s in decimals)

Where,

is = interest rate of sinking fund, i = rate of interest and S = Sinking fund coefficient

Calculation:

i_s = 0.03

Sinking Coefficient (s) = $\mathrm{S}=\frac{{\mathrm{i}}_{\mathrm{s}}}{(1+{\mathrm{i}}_{\mathrm{s}}{)}^{\mathrm{n}}-1}=\frac{0.03}{(1+0.03{)}^{30}-1}=0.021$

i = 0.05

Year's Purchase = $\frac{1}{\mathrm{i}+\mathrm{s}}=\frac{1}{0.05+0.021}$= 14.08 ≈ 14

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ory on which computation of stress in a state of plastic equilibrium is based is called ory of plasticity.

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