---
title: "Materials for 115 m³ brick masonry 1:3"
subject: "Estimating and Costing"
chapter: 4
key: "semester_7/estimating_and_costing:materials-brick-115m3-1-3"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/materials-brick-115m3-1-3
site: BCT Engineering
---

# Materials for 115 m³ brick masonry 1:3

Estimating and Costing · Chapter 4: Analysis of Rates

- Asked in: 2073 Shrawan, 4 marks
- Video: [Calculation of Materials for Brickwork in 1:3 cement mortar | Bricks, cement, sand and Water](https://www.youtube.com/watch?v=Pt7HlAjxWOM) — Knowledge Insights 🇳🇵
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/materials-brick-115m3-1-3
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-4

## Question

Calculate the quantities of materials required for 115 m³ of brick masonry in (1:3) cement mortar (the size of brick is 240 × 115 × 60 mm and thickness of mortar is 12 mm).

## Short answer

Using dry factor 1.27 for mortar and nominal brick size 252x127x72 mm, bricks per m³ is 434. For 115 m³ brickwork, bricks = 49,907 nos, cement = 295.8 bags, sand = 30.82 m³.

## Answer

Assumptions: dry volume = 1.54 × wet volume for concrete and 1.27 × wet volume for mortar; 1 m³ of cement = 28.8 bags of 50 kg; no wastage is added.

Brick 240 × 115 × 60 mm, mortar joint 12 mm.

**115 m³ brickwork, mortar 1:3**
- Brick with mortar $= 0.252 \times 0.127 \times 0.072 = 2304.3\times 10^{-6}$ m³; bricks per m³ $= 1/2304.3\times10^6 = 433.97$
- Bricks for 115.00 m³ $= 433.97 \times 115.00 = 49,907$ nos (say 49,907)
- Volume of bricks only $= 0.240\times0.115\times0.060 = 1656.0\times10^{-6}$ m³ each; wet mortar per m³ $= 1 - 433.97\times1656.0\times10^{-6} = 0.2813$ m³
- Wet mortar for 115.00 m³ $= 32.354$ m³; dry $= 1.27\times32.354 = 41.090$ m³
- Cement $= 1/4\times41.090 = 10.272$ m³ $= 295.8$ bags
- Sand $= 3/4\times41.090 = 30.817$ m³

**Answer: bricks = 49,907 nos; cement = 295.8 bags; sand = 30.82 m³.**

## Check yourself

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

1. Unit size with joint?
   A. 0.240x0.115x0.060
   B. 0.250x0.125x0.070
   C. 0.252 x 0.127 x 0.072 m
   D. 0.264x0.139x0.084
   Answer: C. 12 mm added each way. (Key point: Brick with mortar)

2. Bricks for 115 m^3?
   A. About 534 per m^3
   B. About 49,907 (433.97 per m^3)
   C. About 60,000
   D. About 4,990
   Answer: B. 1/2304.3e-6. (Key point: Bricks)

3. Wet mortar per m^3?
   A. 0.2813 m^3
   B. 0.2567
   C. 0.30
   D. 0.7187
   Answer: A. 1 - 433.97 x 1656e-6. (Key point: Wet mortar)

4. Cement?
   A. 1/3 of 32.354
   B. 3/4 of 41.09
   C. 1/4 of 32.354
   D. Dry 41.09 m^3, 1/4 = 10.272 m^3 = 295.8 bags
   Answer: D. Sum 4. (Key point: Cement)

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