Vocab
Tools and Equipment
properties
different kinds of finishes
Admixtures
100
What is a Admixture?
Something that is added to concrete such as coloring agents or accelerators during the mixing or pouring phase to change the characteristics of the mixture.
100
What is this?
Brick trowel
100
What are Portland cement, water, and aggregates for?
Concrete is made of these three ingredients
100
What is carpet drag?
A gritty finish
100
What are accelerating admixtures?
They speed the initial curing time of the concrete and help in pouring in cold water.
200
What is a Expansion joint?
A groove cut into a slab that allows the concrete to crack at this point so that it does not crack in a more random, unsightly pattern.
200
What is this?
Hand float
200
What are Lime, silica, alumina, and iron for?
The four ingredients that make up Portland cement.
200
What is a metallic hardener?
Produces a finish 8x more abrasion resistant then regular concrete.
200
What are retarding admixtures?
They slow the rate of curing and are useful in warm weather.
300
What is a Broom finish?
A texture created with a stiff bristle broom, leaving behind tiny grooves and rough areas to provide traction.
300
What is this?
Corner trowel
300
What happens if there is too much water in concrete?
The concrete will be too weak.
300
The water that comes to the surface as concrete hardens is called what?
Bleed water.
300
What are water reducing admixtures?
They reduce the water in the concrete.
400
What is a Floor squeegee?
A tool used to remove excess water from a concrete surface and to spread sealant into a concrete slab.
400
What is this?
Mud pan
400
Aggregates should be _____ and not be able to _____ easily.
solid, break
400
What happens to the surface if you sand blast too much?
The aggregates can come loose and come out.
400
What are air entraining admixtures?
They cause air bubbles to form in the concrete which allows it to withstand freezing and cracking.
500
What is a Aggregate?
Sand, gravel, or other similar substances added to the mixture of Portland cement to create concrete or masonry units.
500
What is this?
Bull float
500
What makes cement hard?
The cement forms bonds around the aggregates.
500
What does a concrete stamp do?
Makes a cobblestone pattern on the surface.
500
What are plasticizers?
They make low water mixes more workable.