General Contractors License - Concrete

Front 1

What is used to measure the consistency of concrete

Back 1

Slump Test

Front 2

Air Entrainment concrete quality

Back 2

Resistance to freeze/thaw cycles

Front 3

Concrete will reach approximately ___ - ___ % after 7 days

Back 3

60 - 70%

Front 4

Type I Portland Cement

Back 4

Normal, used for most work

Front 5

Type II Portland Cement

Back 5

Moderate Sulfate Resistance

Front 6

Type III Portland Cement

Back 6

High Early Strenght

Front 7

Type IV Portland Cement

Back 7

Low Heat of Hydration

Front 8

Type V Portland Cement

Back 8

High Sulfate Resistance

Front 9

If the water cement ratio is high, the concrete will be

Back 9

Not as strong

Front 10

Affect of a retarder in concrete

Back 10

Slows down hydration time and extends the setting time

Front 11

Affect of an accelerator

Back 11

Speed up the hydration time, makes it set faster

Front 12

Most efficient Accelerator (also cheapest)

Back 12

Calcium Chloride

Front 13

Slump should range from

Back 13

3-4"

Front 14

Delivery time for Ready Mix Concrete

Back 14

90 minutes, or 300 revolutions

Front 15

Best foundations to use in poor soils

Back 15

Piles & Drilled Peers (Augered Piers)

Front 16

Most effective way to compact granular soils

Back 16

Vibration

Front 17

What type of footing is best for columns

Back 17

Isolated

Front 18

Best type of foundation when the bearing capacity of the soil is low

Back 18

Floating Foundation

Front 19

What must be concerns of concrete form designers

Back 19

- Weight

- Shape

- Load

Front 20

Concrete is approximately ____ pcf.

Back 20

150

Front 21

What are used to insure that the form does not stick ot the concrete

Back 21

Form release agent

Front 22

Splices in rebar should not be less than ____"

Back 22

12"

Front 23

Contraction Joint (Control Joint)

Back 23

Accommodate movement

Front 24

Isolation Joint (Expansion Joint)

Back 24

Used as points of restraint between elements of a structure

Front 25

Construction Joints

Back 25

Joints introduced for convenience or need of the construction process

Front 26

Control joints are cut to ___ thickness of the slab

Back 26

1/4

Front 27

What type of aggregates are preferred for pump mix concrete

Back 27

Rounded Aggregates (river gravel)

Front 28

What intervals should a vibrator be inserted into concrete

Back 28

15"

Front 29

How long should vibrator be inserted into concrete

Back 29

10-15 seconds

Front 30

Concrete is _________ by vibrating air bubbles to the surface

Back 30

Consolidated

Front 31

The proper vibrator technique is _____ insertion and _____ withdrawl

Back 31

- Fast

- Slow

Front 32

Excessive Vibration causes

Back 32

Segregation

Front 33

Hot weather can have what affect on concrete

Back 33

Less strength

Front 34

Concrete should ______ be placed on frozen subgrade

Back 34

Never

Front 35

Concrete _______ causes the concrete to dry at the proper rate

Back 35

Curing

Front 36

How much should concrete be Air-Entrained to avoid scaling

Back 36

5-8%

Front 37

What is a method to control scaling

Back 37

Air Entrain

Front 38

Max slump for lightweight concrete

Back 38

5"

Front 39

What can be added to make concrete flow better

Back 39

Plasticizer

Front 40

A plasticizer can sometimes cause _____ in concrete

Back 40

Segregation

Front 41

Chemical reaction between water and concrete is called

Back 41

Hydration

Front 42

Recommended slump for piers

Back 42

1-3"

Front 43

Increase in strength of concrete stops ____

Back 43

when there is no moisture present

Front 44

______ is a way to obtain a non-slip finish on unhardened concrete surfaces

Back 44

Brooming

Front 45

The maximum temp for placing concrete is

Back 45

90 degrees

Front 46

Type of joint that permits both vertical and horizontal movement

Back 46

Isolation Joint

Front 47

The design element in a form that allows for settlement and deflection is a ______

Back 47

camber

Front 48

Within how man hours after concrete is placed on a jobsite should concrete joints be sawn

Back 48

4 - 12 hours

Front 49

Air Entraining concrete will not

Back 49

Increase the water tightness