Concrete

Cement consists of ...

• water
• fine powder
• fine aggregates
• coarse aggregates

When ... is added to cement and it begins to set.

• water
• powder
• concrete
• reinforcement

When water is added, the cement starts to become ...

• solid
• coarse
• fine
• soluble

The most widely used cement-based material is 

• sand
• pebbles
• concrete
• gravel

Gravel is ...

• fine aggregate
• coarse aggregate
• plasticizer
• retarder

Sand is ...

• fine aggregate
• coarse aggregate
• reinforcement
• additive

After concrete has set, it structural strenght is reached in ...

• 14 days
• 20 days
• 28 days
• 32 days

1:2:4 mix consists of 

• 1 part of cement
• 2 parts of cement
• 3 parts of cement
• no cement

1:2:4 mix consists of ...

• 2 parts of water
• 2 parts of cement
• 2 parts of fine aggregates
• 2 parts of coarse aggregates

1:2:4 mix consists of ...

• 4 parts of water
• 4 parts of cement
• 4 parts of fine aggregates
• 4 parts of coarse aggregates