---
title: "RCC slab culvert (u): four items"
subject: "Estimating and Costing"
chapter: 6
key: "semester_7/estimating_and_costing:slab-culvert-u-four-items"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/slab-culvert-u-four-items
site: BCT Engineering
---

# RCC slab culvert (u): four items

Estimating and Costing · Chapter 6: Detailed Estimate

- Asked in: 2066 Bhadra (old course), 14 marks
- Video: [Estimation of 5.0m *2.5m R.C.C. Slab Culvert. RCC slab culvert estimate design and drawing.](https://www.youtube.com/watch?v=XQfb2awxgMk) — MR. CIVIL ENGINEER
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/slab-culvert-u-four-items
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-6

## Question

Estimate the quantities of the following items of work from the accompanying drawing.
a) Earthwork in excavation
b) Cement concrete in foundation
c) Brick work
d) RCC work
[Figure: RCC slab culvert; roadway 4 m, overall length 530 cm, 8 cm C.C. wearing coat, 22 cm thick road metal, slab 30 cm with 10 mm dia @ 22 c/c and 16 mm dia @ 10 c/c bars (alternate bars cranked), wall 50 cm × 90 cm, footing 80 cm × 30 cm, 45 degree earth slope, 150 cm, 140 cm, 120 cm, 500 cm length, 15 cm offsets. All dimensions in centimetres.]

## Short answer

Excavation:5.936 m³. Plain cement concrete foundation:2.544 m³. Brickwork:4.770 m³. RCC work in slab:3.339 m³.

## Answer

#### Reading of the drawing (dimensions in the scan are hard to read; assumed values are stated)

- Overall length of culvert across the road $5.30$ m (4.00 m roadway plus kerbs). Clear span $1.50$ m.
- Abutment: wall $0.50$ m thick $\times$ $0.90$ m high; C.C. foundation (1:3:6 assumed) $0.80$ m wide $\times$ $0.30$ m thick; excavation to $0.70$ m depth (0.30 m C.C. plus 0.40 m below bed level).
- Slab $0.30$ m thick resting $0.30$ m on each abutment (span $1.50 + 2 \times 0.30 = 2.10$ m). The wearing coat and road metal are not asked.

#### a) Earthwork in excavation

$V = 2 \times 0.80 \times 5.30 \times 0.70 = 5.936$ m³

#### b) Cement concrete in foundation

$V = 2 \times 0.80 \times 0.30 \times 5.30 = 2.544$ m³

#### c) Brickwork

$V = 2 \times 0.50 \times 0.90 \times 5.30 = 4.770$ m³

#### d) RCC work (slab)

$V = 5.30 \times 2.10 \times 0.30 = 3.339$ m³

**Answer: excavation = 5.936 m³; C.C. foundation = 2.544 m³; brickwork = 4.770 m³; RCC slab = 3.339 m³.**

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. How is the excavation depth of 0.70 m obtained for the culvert abutments?
   A. 0.30 m C.C. foundation plus 0.40 m below bed level
   B. 0.90 m wall height minus 0.20 m
   C. 0.30 m slab plus 0.40 m
   D. 0.80 m footing width minus 0.10 m
   Answer: A. The trench holds the 0.30 m C.C. foundation plus 0.40 m of depth below the bed level, giving 0.70 m. (Key point: Excavation depth)

2. Which expression gives the brickwork in the two abutment walls?
   A. 2 x 0.80 x 0.90 x 5.30
   B. 2 x 0.50 x 0.90 x 5.30
   C. 2 x 0.50 x 0.30 x 5.30
   D. 1 x 0.50 x 0.90 x 4.00
   Answer: B. Brickwork is wall thickness 0.50 x height 0.90 x length 5.30 for each of the 2 abutments, 4.770 m3. (Key point: Brickwork volume)

3. Why is the slab length taken as 2.10 m in the RCC quantity?
   A. Clear span 1.50 m plus 0.30 m bearing on each abutment
   B. Roadway width 4.00 m minus 1.90 m
   C. Footing width 0.80 m plus 1.30 m
   D. Clear span 1.50 m plus the 0.50 m wall thickness
   Answer: A. The slab spans 1.50 m and rests 0.30 m on each abutment, so 1.50 + 2 x 0.30 = 2.10 m; volume 5.30 x 2.10 x 0.30 = 3.339 m3. (Key point: Slab length for RCC)

4. The C.C. foundation is 0.80 m wide, 0.30 m thick, 5.30 m long under each of 2 abutments. What is its volume?
   A. 1.272 m3
   B. 2.544 m3
   C. 5.936 m3
   D. 3.339 m3
   Answer: B. 2 x 0.80 x 0.30 x 5.30 = 2.544 m3. (Key point: C.C. foundation volume)

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