Blocks vs Bricks

Which of the following is NOT a property of blockworks?

• Faster to construct

• Good fire resistance

• Highly reflective to sound

• Poor speed of construction

Blocks heavier than 20 kg should be lifted by a single person.

• True

• False

Which British standards property is specified for blocks that is not included in bricks standards?

• Color

• Type of aggregate used (lightweight or dense)

• Price

• Manufacturer

Name two types of concrete blocks shown in the image.

• Solid, Cellular

• Reinforced, Precast

• Lightweight, Perforated

Which of the following can be included in dense aggregate for the manufacture of concrete blocks?

• Crushed granite

• Limestone

• Gravel

• All of the above

Medium and lightweight aggregate include expanded clay, expanded blast furnace slag, sintered ash and _______.

• pumice

• granite

• limestone

• marble

Lightweight concrete blocks can be made of aircrete by the addition of which metal powder to a fine mix of sand, lime, fly ash and Portland cement?

• Iron

• Aluminium

• Copper

• Zinc

Hydrogen gas is generated in the manufacture of aircrete by the dissolution of the metal powder, giving non-interconnecting cellular structure.

• True

• False

Some lightweight concrete blocks with less than 7 MPa crushing strength should not be used below DPC level, except for the inner skin of cavity construction.

• True

• False

What does U-value measure in building elements?

• U-value measures thermal transmittance, i.e., how well a building element (like a wall, roof, or window) transmits heat.

• U-value measures the sound insulation properties of a building element.

• U-value measures the fire resistance of a building element.

• U-value measures the structural strength of a building element.