Revision

The center of wood is called...

• Sapwood

• Annual ring

• Pith

• Bark

In which direction wood has higher strength?

• Parallel to the grain

• Perpendicular to the grain

Solar kilns...

• Capture the energy of the sun

• Have Low running costs

• Have low environmental impact

• All the above

What is the purpose of Cement in Concrete ?

• To increase concrete hardness

• To reduce shrinkage

• To bind the materials together

• To increase workability

Hydraulic Cement sets and hardens by the action of Air

• True

• False

Portland Cement is Hydraulic Cement

• True

• False

Which type of cement would you use in urgent works that require rapid setting and rapid hardening ?

• 42.5 N

• 42.5 R

• 42.5 L

Which type of cement has higher strength in 7 days?

• 52.5 N

• 52.5 L

Curing in concrete is required to expel the entrapped air (air bubbles) of fresh concrete

• True

• False

Curing minimize shrinkage

• True

• False