Civil Engineering - Estimating and Costing - Discussion

Quantity of cc road = 1000*8*0.15 = 1200 cum.
Quantity of sub-base gravel = 1000*8*0.10 = 800 cum.
Tt. Quantity = 1200 + 800 = 2000 cum.
Formulae for cut-off volume = (1/4)*2000,
= 500 cum.

Box cutting in road crust = 2000-500,
= 1500 cum.
Hence, 1500 cum is the total volume for box cutting in road crust.

The road is made of two layers:

1. A 15 cm thick concrete layer.
2. A 10 cm thick gravel sub-base layer.

Box cutting is all about how much earth you need to remove, so we only care about the final dimensions of the road profile. So, we need to consider both layers (concrete and gravel) to determine the total depth of the excavation.

1. Calculate the total thickness:
The total thickness is 15 cm (concrete) + 10 cm (gravel) = 25 cm.
We need to convert this to meters: 25 cm = 0.25 m.

2. Calculate the volume:
Volume is calculated by: Length x Width x Height (or Thickness in this case).
Length = 1000 m.
Width = 8 m.
Thickness = 0.25 m.
Volume = 1000 m x 8 m x 0.25 m = 2000 m3.

Therefore, the correct answer is Option D: 2000 m3.