Test II - Concrete 1

Question 1

Concrete

Answer 1

Binds together aggregate

Question 2

What is the difference in Asphalt and Concrete?

Answer 2

Binder

Question 3

Aggregate

Answer 3

carries the load

Question 4

Concrete is made of what?

Answer 4

Portland Cement, Aggregate, and water

Question 5

Portland Cement

Answer 5

Developed by Joseph Aspdin in 1824

Question 6

Hydration

Answer 6

when cement combines chemically with water to form strong crystals that bind aggregates together, it is exothermic

Question 7

What is the Concrete Mix Ratio?

Answer 7

1 cf cement, 3 cf fine and coarse sand, 4 cf aggregate, .81 cf water

Question 8

What is the actual yield of combined volumes?

Answer 8

60%

Question 9

Major compounds formed during Portland cement production?

Answer 9

C3S, C2S, C3A, C4AF

Question 10

What products are formed as portland cement reacts with water?

Answer 10

CSH, CH, CSAH

Question 11

What is the ideal ambient temperature for curing?

Answer 11

68

Question 12

Portland Cement Type I

Answer 12

normal

Question 13

Portland Cement Type II

Answer 13

moderate sulfate resistance

Question 14

Portland Cement Type III

Answer 14

high early strength (better for thin structures or cold ambient temps)

Question 15

Portland Cement Type IV

Answer 15

low heat of hydration (slow cure, better for thick structures or hot ambient temperatures)

Question 16

Portland Cement Type V

Answer 16

high sulfate resistance

Question 17

Normal weight aggregates

Answer 17

150 pcf

Question 18

Light weight aggregates

Answer 18

80 pcf

Question 19

Heavy weight aggregates

Answer 19

250 pcf

Question 20

What determines if aggregate is fine or coarse?

Answer 20

4 Sieve

Question 21

How much does a cubic foot of concrete weigh?

Answer 21

150 pounds

Question 22

How much does a Cubic yard of concrete weigh?

Answer 22

4,050 pounds

Question 23

Concrete truck rear discharge

Answer 23

9 cubic yards, 36,450 pounds

Question 24

Concrete truck front discharge

Answer 24

11-12 cubic yards, 48,600 pounds

Question 25

What is slump?

Answer 25

relates to water content

Question 26

The greater the slump

Answer 26

weaker, more workability, easier to consolidate, more time to finish surface

Question 27

The lesser the slump

Answer 27

stronger, harder workability, hard to consolidate, less time to finish surface

Question 28

Concrete Batch Plant

Answer 28

water, cement, aggregate, water truck mix

Question 29

Concrete is green for how long?

Answer 29

First 3-4 days

Question 30

How do you test Concrete?

Answer 30

2-3 cylinders per batch in compression machine tester

Question 31

Honeycombing

Answer 31

failed consolidation, air pockets around aggregate

Question 32

Birdbath

Answer 32

Low spot

Question 33

Scalding or Spalling

Answer 33

flaking off of weak thin top layer, too much water at surface, caused by over-consolidation

Question 34

Finishing concrete

Answer 34

rake, screed, float, broom/stamp/edge

Question 35

What does porous concrete do?

Answer 35

reduces flooding, less strength

Question 36

PCA

Answer 36

Portland Cement Association, set standards for PC

Question 37

ACI

Answer 37

American Concrete Institute, set standards for concrete

Question 38

CRSI

Answer 38

Concrete Reinforced Steel Institute, set standards for steel in concrete

Question 39

ASTM

Answer 39

American Society of Testing & Materials, set standard for testing and material properties for all types of materials