Properties of clay bricks.

The compressive strength of bricks ranges from:

• 30 N/mm² to 40 N/mm²

• 3 N/mm² to 40 N/mm²

• 1 N/mm² to 10 N/mm²

• 300 N/mm² to 400 N/mm²

Water absorption in bricks should be below:

• 2%

• 50%

• 20%

• 5%

Engineering bricks are normally used for which 2 purposes?

• Internal walls

• External walls

• Below ground level

• Supporting steel beams

Under BS EN771-1 which type of brick is classified for Severe exposure areas?

• S2

• F0

• F1

• F2

Which defect leaves a white deposit on the surface of the bricks?

• Thermal movement

• Efflorescence

• Sulphate attach

• Frost attach

Which type of defect is shown here?

• Sulphate attack

• Frost attack

• Thermal movement

• Efflorescence

Reorder the correct manufacturing process for bricks

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• Breaking and screening
• Clay and water mixing
• Compressing and extruding
• Cutting to size
• Drying and Kiln Firing

What temperature is required to permanently change the properties of clay?

• 8000-12000 ∘C

• 50-100 ∘C

• 800–1200 ∘C

• 200-500 ∘C

Mortar mix should be:

• Stronger than the bricks

• Weaker than the bricks

• The same strength as the bricks

• It doesn't matter

Sulphate damages which element of a masonry wall ?

• The clay bricks

• The cement

• The aggregates

• The wall ties