Concrete Flashcards
What can be added to concrete to modify its properties?
admixture
An _______ is an admixture that provides greater resistance to freezing and high early strength properties.
air-entraining admixture
A ______ is an admixture that significantly reduces the amount of water required in a concrete mixture and increases the workability of concrete.
superplasticizer
A _______ is an admixture that delays the setting and hardening of concrete.
retarder
An _______ is an admixture that shortens the setting time and increases early strength of concrete.
accelerator
_______ is a mixture of cement, fine and coarse aggregate and water.
Concrete
What is the chemical process during which concrete develops it’s load-bearing properties and design strength?
hydration
_______ are placed in footings and foundation walls to provide tensile strength and to tie together adjacent parts of foundations, walkways, and concrete stairways.
Rebar
______ is heavy gauge wire joined in a grid and used to reinforce increase the tensile strength of concrete.
Welded wire reinforcement/ welded wire fabric
______ is a type of concrete-forming system that consists of a layer of concrete sandwiched between expanded polystyrene(EPS) foam forms on each side.
Insulating concrete form(ICF)
______ construction can contribute to LEED certification since it does not contain formaldehyde and any waste material is 100% recyclable.
ICF
What two types of welded wire reinforcement are there?
smooth and deformed
The letter ____ designates smooth wire for WWR and the letter ____ designates deformed wire.
W
D
What does 6 x 12 W12 x W5 indicate for WWR?
The 6 represents the longitudinal(length) spacing length in inches and the 12 represents the transverse(width) spacing.
The W’s indicate smooth wires.
The numbers 12 & 5 represent the wire sizes.
What size diameter are the following numbers rebar?
#3 #4 #5 #6 #7 #8 #9 #10
3/8” 1/2” 5/8” 3/4” 7/8” 1” 1 1/8” 1 1/4”
Concrete reaches full strength in approximately _____ days.
28
A ________ is a patented tie system with spreader cones to maintain form wall spacing and tie the walls together when concrete is placed.
snap tie
What are three advantages of ICF construction?
Minimal air infiltration
reduced heating and cooling loads
better fire resistance
_______ is perforated pipe installed along the outer edge of foundation footings to collect stormwater and surface water and move it away from the foundation.
Drain tile
What are three ways of waterproofing foundation walls?
liquid membranes, asphalt sheet membranes and rigid foundation waterproofing panels
The top of the foundation wall should extend at least ___ above the finish grade.
8”
To determine the actual rebar diameter, multiply the number by _______.
1/8”
A ______ is a horizontal structural member installed above a door or window and used to distribute the weight from the structure above to either side of the opening.
lintel
A _____ is a horizontal member used to align and reinforce concrete formwork.
waler
