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1.	Excess of silica in the clay ______1). Makes the brick brittle and weak2). Makes the brick crack and warp on drying3). Changes the color of the brick from red to yellow4). Improves the impermeability and durability of the brick
Answer» Silica Good brick EARTH should CONTAIN 50 – 60% of silica. It prevents CRACKING, shrinking and wrapping of raw bricks. Silica imparts uniform shape to the bricks. Excess of silica MAKES the bricks brittle.

Excess of silica in the clay ______1). Makes the brick brittle and weak2). Makes the brick crack and warp on drying3). Changes the color of the brick from red to yellow4). Improves the impermeability and durability of the brick

Answer»

Silica

Good brick EARTH should CONTAIN 50 – 60% of silica.

It prevents CRACKING, shrinking and wrapping of raw bricks.

Silica imparts uniform shape to the bricks.

Excess of silica MAKES the bricks brittle.

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