Concrete

Question 1

What can be added to concrete to modify its properties?

Answer 1

admixture

Question 2

An _______ is an admixture that provides greater resistance to freezing and high early strength properties.

Answer 2

air-entraining admixture

Question 3

A ______ is an admixture that significantly reduces the amount of water required in a concrete mixture and increases the workability of concrete.

Answer 3

superplasticizer

Question 4

A _______ is an admixture that delays the setting and hardening of concrete.

Answer 4

retarder

Question 5

An _______ is an admixture that shortens the setting time and increases early strength of concrete.

Answer 5

accelerator

Question 6

_______ is a mixture of cement, fine and coarse aggregate and water.

Answer 6

Concrete

Question 7

What is the chemical process during which concrete develops it’s load-bearing properties and design strength?

Answer 7

hydration

Question 8

_______ are placed in footings and foundation walls to provide tensile strength and to tie together adjacent parts of foundations, walkways, and concrete stairways.

Answer 8

Rebar

Question 9

______ is heavy gauge wire joined in a grid and used to reinforce increase the tensile strength of concrete.

Answer 9

Welded wire reinforcement/ welded wire fabric

Question 10

______ is a type of concrete-forming system that consists of a layer of concrete sandwiched between expanded polystyrene(EPS) foam forms on each side.

Answer 10

Insulating concrete form(ICF)

Question 11

______ construction can contribute to LEED certification since it does not contain formaldehyde and any waste material is 100% recyclable.

Answer 11

ICF

Question 12

What two types of welded wire reinforcement are there?

Answer 12

smooth and deformed

Question 13

The letter ____ designates smooth wire for WWR and the letter ____ designates deformed wire.

Answer 13

W

D

Question 14

What does 6 x 12 W12 x W5 indicate for WWR?

Answer 14

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.

Question 15

What size diameter are the following numbers rebar?

#3
#4
#5
#6
#7
#8
#9
#10

Answer 15

3/8”
1/2”
5/8”
3/4”
7/8”
1”
1 1/8”
1 1/4”

Question 16

Concrete reaches full strength in approximately _____ days.

Answer 16

28

Question 17

A ________ is a patented tie system with spreader cones to maintain form wall spacing and tie the walls together when concrete is placed.

Answer 17

snap tie

Question 18

What are three advantages of ICF construction?

Answer 18

Minimal air infiltration
reduced heating and cooling loads
better fire resistance

Question 19

_______ is perforated pipe installed along the outer edge of foundation footings to collect stormwater and surface water and move it away from the foundation.

Answer 19

Drain tile

Question 20

What are three ways of waterproofing foundation walls?

Answer 20

liquid membranes, asphalt sheet membranes and rigid foundation waterproofing panels

Question 21

The top of the foundation wall should extend at least ___ above the finish grade.

Answer 21

8”

Question 22

To determine the actual rebar diameter, multiply the number by _______.

Answer 22

1/8”

Question 23

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.

Answer 23

lintel

Question 24

A _____ is a horizontal member used to align and reinforce concrete formwork.

Answer 24

waler