Concrete

Question 1

Slump Test

Answer 1

Measures consistancy - 11

Question 2

Air Entrainment

Answer 2

Contains air bubbles, improves resistance to freezing and thawing - 11

Question 3

Seven Day Compressive Strength

Answer 3

Approximately 65-70% of 28 day test - 13

Question 4

Types Of Portland Cement

Answer 4

Type I - General Purpose, Type II, Type III - High early Stregth - 14

Question 5

Fly ash

Answer 5

Byproduct of Coal Burning power plant, same binder as portland cement - 13

Question 6

Water Cement Ratio, Strong Stone

Answer 6

By weight, determines quality, Increases Abrasion Resistance - 17

Question 7

Large Aggregate

Answer 7

Produces More Economical Concrete - 18

Question 8

Retarders, Accelerators,

Answer 8

Superplasticizers Reduce water by 30% - 19

Question 9

Max Delivery Time___, Drum Revolutions

Answer 9

90 minutes, can be limited by purchaser - 38

Question 10

Indepent Isolated Colum

Answer 10

Most common, rectangular or square footing - 47

Question 11

Designer Concerned With Weight And Shape

Answer 11

Formwork - 54

Question 12

Form Types

Answer 12

Job Built, Prefab, Manufactured, Special - 57

Question 13

Fiber Tube Forms Require Stiffeners

Answer 13

For forms over 15feet - 62

Question 14

Insulating Concrete Form that Stay In Place

Answer 14

ICFs, Hollow fom blocks64

Question 15

Duplex Nails

Answer 15

Removable without damaging lumber - 66

Question 16

Concrete Weighs how many Pounds per Cubic Foot

Answer 16

150 - 70

Question 17

Typical Form Release Agents, Maximum Drop Distance 5’

Answer 17

Diesel Oil, heating oil, recycled motor oil - 76

Question 18

Rate Of Pour

Answer 18

Slower pour reduces pressure - 74

Question 19

When are Forms Are To Be Removed

Answer 19

When the Engineer Specifies - 81

Question 20

Test Cylinders Are…. , Cumputer programs provide?

Answer 20

Made the same time as placing, Non destructvie evaluation - 81

Question 21

Compression Cylinder Test Results are done when?

Answer 21

Prior To Removing Shoring - 83

Question 22

Epoxy Coating On Rebar Prevents

Answer 22

Corrosion - 94

Question 23

Concrete Cover Table

Answer 23

Table 6.3 - 100

Question 24

Stirrup Tolerance -

Answer 24

Plus Or Minus 1” - 101

Question 25

Concrete Joint Types

Answer 25

Contraction, Isolation, Construction - 109

Question 26

Contraction Joints

Answer 26

Planned cracks cut 1/4 slab thickness or min 1” - 121

Question 27

Saw Joints Should Be Installed Between__ Hours And___ Hours After The Concrete Is Poured.

Answer 27

4,12 - 122

Question 28

Wet Down Ground Under Slab To…

Answer 28

Prevent uneven or excesive absorbsion of water fromconcrete - 151

Question 29

Pump Mix Should have what kind of aggregate?

Answer 29

Rounded, such as river gravel - 176

Question 30

Vibration does two things…

Answer 30

Makes stiff mix more flowable helps consolidation - 178

Question 31

Slab Finishing Sequence, Edging Last Step After Trowel Finish, Troweling Too Soon Will Cause The Slab Surface To Be Rough, The Bull Float Knocks Down The High And Lows .

Answer 31

183

Question 32

20 Degree Increase In Temperature Reduces Setup Time By

Answer 32

50% - 180

Question 33

Never Pour On Frozen Ground, Below___ Degrees Considered Cold Weather

Answer 33

40 - 181

Question 34

Curing Controls what?, Curing Starts Immediately…

Answer 34

The Drying Of Concrete, Helps With Strength And Durability - 186

Question 35

Cause Of Plastic Shrinkage Cracks…

Answer 35

Rapid Evaporation - 196

Question 36

Cure Test Cylinders At Jobsite for how long? What temperature?

Answer 36

24to 48 hrs, 60- 80 Degrees - 201