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Harmful ingredients in brick earth
Short answer
Lime lumps cause cracking, iron pyrites disintegration, alkalies efflorescence and distortion, pebbles and grit weaken, organic matter leaves voids, excess sand makes bricks brittle, and excess iron oxide darkens and fuses bricks.
Explain the harmful ingredients of brick earth and their effects on the properties of bricks.
Harmful ingredients in brick earth reduce the quality of the finished brick.
| Ingredient | Harmful effect |
|---|---|
| Lime (excess, as lumps) | Absorbs moisture after burning, slakes and expands, causing the brick to crack and break |
| Iron pyrites | Oxidise and cause the brick to disintegrate |
| Alkalies (soda, potash) | Cause efflorescence and fuse the brick, making it distorted |
| Pebbles, gravel, grit | Prevent uniform mixing and make the brick weak |
| Excess iron oxide | Gives dark blue colour and fusion |
| Vegetation and organic matter | Burns, leaves voids and makes the brick porous and weak |
| Excess sand | Makes the brick brittle |
✓ Answer checked by Claude Opus 5.5 (high effort)
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