Introduction to Concrete and Masonry

1
Introduction to Concrete and Masonry

• Ag III and IV

2
Its pretty much everywhere.

• Work in groups of 3.
• In the next four minutes, list a different item
  made from concrete for each letter of the
  alphabet.
• Example AApple red fire hydrants

3
Todays objectives

• Define concrete
• Name rules for making quality concrete
• List ingredients in concrete
• Identify properties of concrete

4
What is concrete?

• One of the most widely used building materials in
  the world
• No other building material in which the final
  product depends so much upon the user than
  concrete
• Its everywhere
• Share your lists!

5
Its going to be around for a while

• Easy mixing process yields a product that weighs
  150-160 lbs per cubic foot.
• Components of concrete water, cement, and
  aggregate, are plentiful
• Requires little energy for production and use
• Qualities that give concrete appeal are going to
  still be important down the road
• Strength
• Versatility
• Durability
• Fire resistance

6
Rules for making concrete

• Use proper ingredients
• Proportion ingredients correctly
• Accurately measure the ingredients
• Mix the ingredients thoroughly
• Follow proper finishing and curing methods

7
So what are the ingredients? (And how do they
work?)

• Portland Cement
• Aggregate
• Water
• Portland and water forms a paste around each
  piece of aggregate
• Changes from a plastic state to a hardened state
• Its not drying! Its a chemical change. (Think
  release of heat.)

8
Properties of plastic concrete

• Consistency (or slump)- wetness or dryness of the
  mix
• Uniformity- thorough mixing of ingredients
• Workability- ease with which it can be placed and
  consolidated

9
Properties of hardened concrete

• Each person is receiving an index card.
• Match the correct word with the definition.
• Take your seats, so Ill know youre done.

10
Todays objectives

• Identify properties of concrete
• Name rules for making quality concrete
• List ingredients in concrete
• Discuss the difference between cement and concrete