Calculating rubble (boulder )soling & PCC for the compound wall. / Estimating & costing of a compound wall ( part 2 ).

 PART 1    👈 BACK

Let us make a boulder soling of 9" thick ( 0.75 ft.) for the footing as shown below.

From part 1,  the volume of excavation for the footing = 140 cu ft.

From the above drawing, depth of excavation = 2.5 ft.,  depth of soling = 0.75 ft.

2.  Boulder soling for the compound wall

The volume of soling for the footing.

   = ( 0.75 ft ÷ 2.5 ft.) × 140 cu ft.

    (by volume  ratio with excavation)

  = 0.30 × 140 cu ft.

 = 42 cu ft.

 3.  PCC for the compound wall

Let us prepare 4" thick ( 0.33 ft.) PCC bed for the footing & plinth beam.

The volume of PCC for the footings

Vp1 = ( 0.33 ft ÷ 2.5 ft.) × 140 cu ft.

           (by volume  ratio with footing excavation)

      = 0.132 × 140 cu ft.

      = 18.48 cu ft.

From part 1, the volume of excavation for the plinth beam = 145.365 cu ft.

From the above drawing, depth of excavation = 0.9166 ft. 

PCC thickness = 4" ( 0.33ft.).

The volume of PCC for the plinth beam

Vp2 = ( 0.33 ft ÷ 0.9166 ft.) × 145.365 cu ft.

         (by volume  ratio with plinth beam excavation)

      = 0.36 × 145.365 cu ft.

      = 52.33 cu ft.

The total volume of the PCC for the compound wall

   = Vp1 + Vp2

  = 18.48 cu ft.+ 52. 33 cu ft.

 = 70.81 cu ft.

Calculating the quantity of materials in PCC.

Let us make PCC in the 1:2:4 mix.

Quantity of cement bags required for PCC 

= 17.942 bags × ( 70.81cu ft ÷ 100 cu ft.)

=  12.70 bags.

 The volume of sand required for PCC

= 44 cu ft. × ( 70.81cu ft ÷ 100 cu ft.)

=  31.156 cu ft.

The volume of aggregates required for PCC

= 88 cu ft. × ( 70.81cu ft ÷ 100 cu ft.)

= 62.31cu ft.

Note: The value taken for the calculation purpose is derived in the article "Calculating the quantity of materials in 100 cu ft. & 1 cum. of M15 (1:2:4 ) grade concrete".

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