---
title: "Preparation of clay for bricks"
subject: "Civil Engineering Materials"
chapter: 3
key: "semester_3/civil_engineering_materials:clay-preparation-for-bricks"
source: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/clay-preparation-for-bricks
site: BCT Engineering
---

# Preparation of clay for bricks

Civil Engineering Materials · Chapter 3: Clay Products

- Asked in: 2078 Kartik, 3 marks
- Video: [How Bricks Are Made — Full Industrial Process From Clay Quarry to Finished Brick | Industrial Vision](https://www.youtube.com/watch?v=XjpOZhIU-qs) — Industrial Vision
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/clay-preparation-for-bricks
- Whole chapter: https://www.bctengineer.com/md/semester_3/civil_engineering_materials/chapter-3

## Question

Explain briefly the operations involved in preparation of clay for the manufacturing process of brick.

## Short answer

Clay preparation involves removing topsoil, digging, removing impurities, weathering for months, blending with necessary materials, and tempering with water to a uniform plastic mass ready for moulding.

## Answer

The clay is prepared in these operations.

1. **Unsoiling:** the top 200 mm of soil containing impurities and organic matter is removed.
2. **Digging:** clay is dug up and heaped in lumps of about 300 to 400 mm.
3. **Cleaning:** stones, roots, pebbles and lime lumps are removed by hand.
4. **Weathering:** the clay is exposed to rain, sun and frost for a few weeks (up to a season); this makes it more uniform and breaks lumps.
5. **Blending:** different earths are mixed and sand or ash is added if needed to improve composition.
6. **Tempering:** water is added and the clay is kneaded by feet, spades or pug mill until a uniform plastic mass is obtained, ready for moulding.

## Check yourself

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

1. Unsoiling is:
   A. Mixing water
   B. Burning
   C. Moulding
   D. Removing the top 200 mm of soil with impurities
   Answer: D. The top layer has organic matter. (Key point: Unsoiling)

2. Weathering clay does what?
   A. Makes it more uniform and breaks lumps
   B. Burns it
   C. Hardens it
   D. Adds colour
   Answer: A. Exposure to rain, sun and frost for weeks. (Key point: Weathering)

3. Tempering is:
   A. Drying clay
   B. Adding water and kneading to a uniform plastic mass
   C. Burning clay
   D. Digging clay
   Answer: B. Done by feet, spades or pug mill. (Key point: Tempering)

## Related in Civil Engineering Materials

- [Manufacturing process of bricks](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Amanufacturing-process-of-bricks) — Civil Engineering Materials, chapter 3, asked 4×
- [Manufacturing process of lime](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Amanufacture-of-lime) — Civil Engineering Materials, chapter 4, asked 2×
- [Why bricks are widely used](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Awhy-bricks-widely-used) — Civil Engineering Materials, chapter 3, asked 3×
- [Constituents of brick earth and functions](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Aconstituents-brick-earth-functions) — Civil Engineering Materials, chapter 3, asked 9×

## Related in other subjects

- [Compressive strength test and classification of bricks](https://www.bctengineer.com/question.md?key=semester_5%2Fdesign_of_timber_and_masonry_structures%3Abrick-compressive-strength-test-classification) — Design of Timber and Masonry Structures, chapter 8
- [IC manufacturing steps; top-down F = xz + y](https://www.bctengineer.com/question.md?key=semester_6%2Fembedded_system%3Aic-manufacturing-steps-topdown-xz-y) — Embedded System, chapter 8