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Module 2 Flashcards

Concrete (72 cards)

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1
Q

Concrete components

A

Water, Cement, Coarse and Fine Aggregates, Admixtures (optional)

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2
Q

Mortar components

A

Water, Cement, Fine Aggregates

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3
Q

Cement paste components

A

Water, Cement

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4
Q

What type of cement is Portland Cement?

A

Hydraulic cement

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5
Q

Cement components

A

Limestone, Clay, Iron Ore, Cement rock

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6
Q

What is the first stage of cement?

A

Mixing (1-2 mins)

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7
Q

What is the second stage of cement?

A

Induction (1-2 hours)

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8
Q

What is the third stage of cement?

A

Acceleration (12-24 hours)

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9
Q

What is the fourth stage of cement?

A

Deceleration (20-25 hours)

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10
Q

What is the fifth stage of cement?

A

Diffusion Limited

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11
Q

Water Cement ratio

A

Water/Cement

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12
Q

Specific Gravity

A

Density of Substance/Density of Water

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13
Q

First type of Aggregate

A

Coarse Aggregate

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14
Q

Second type of Aggregate

A

Fine Aggregate

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15
Q

Particles are greater than 1/4 inches, comprise 40-45% of the mixture, and where concrete gets is the compressive strength

A

Coarse Aggregate

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16
Q

Particles are greater than 3/8 inches, comprise 30-35% of the mixture, and where concrete gets filled up

A

Fine Aggregate

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17
Q

Denser aggregates

A

Well-Graded Aggregate

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18
Q

Hollow aggregates

A

Poorly Graded Aggregate

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19
Q

A characteristic of aggregates where it will give a stronger final concrete

A

Strong and Hard

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20
Q

A characteristic of aggregates is that it can stand up to wear and tear and weathering

A

Durable

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21
Q

A characteristic of aggregates is that it doesn’t react with cement

A

Chemically inactive

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22
Q

A characteristic of aggregates where dirt and clay are not sticking to the mixture

A

Clean

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23
Q

A characteristic of aggregates where it varies in sizes

A

Graded

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24
Q

Aggregate that is more workable

A

Rounded aggregates

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25
Aggregate that is harder to work with but can make the concrete stronger
Angular aggregate
26
Combining with water
Hydration
27
Grade of aggregate that has fewer spaces
Well Graded
28
Grade of aggregate that is loose
Poorly Graded
29
Grade of aggregate that has no interaction with rocks and has low support
Gap Graded
30
A crucial component of concrete that holds aggregates together like glue and should be filtered and drinkable
Water
31
Optional component of concrete
Admixture
32
Admixture that is added to alter the properties of concrete
Chemical Admixtures
33
Adding microscopic air bubbles to make the concrete easier to finish
Air Entraining Admixtures
34
Speed the set time of the mixture
Set Accelerators/Acceleration Plasticizers
35
Slowing the setting of concrete
Set Retarders/Retanding Plasticizers
36
Used to produce the amount of water required for a slump
Water Reducer
37
Augments the strength and density of concrete
Mineral Admixtures
38
Mineral additives in admixtures
Pozzolanic Materials
39
Types of Mineral Admixture
Natural Pozzolans and Artificial Pozzolans
40
Four Properties of Concrete
Workability, Cohesiveness, Strength, and Durability
41
Three Different States of Concrete
Plastic, Setting, and Hardened
42
Concrete can be worked and is like "bread dough"
Plastic State
43
Concrete begins to stiffen, and this takes place after compaction and during finishing
Setting State
44
A method of keeping concrete at a suitable temperature and moisture level over an extended period of time
Curing
45
It is how easy concrete is to place, handle, compact, and finish a concrete mix
Workability
46
Measured by its compressive strength using the compression test
Strength and Durability
47
Removing air from concrete
Compaction
48
How well does concrete hold together
Cohesiveness
49
When does concrete testing occur?
Plastic state
50
Shows the workability of concrete
Slump Test
51
Measures concrete strength
Compression test
52
Slump that falls as one, and the ideal type of slump
True Slump
53
One side has a lesser slump
Shear Slump
54
A type of slump which has too much water
Collapse Slump
55
There are no changes once the cone is removed; too little water
Zero Slump
56
It is a representative of the concrete supplied
Sampling
57
A test is done to make sure the concrete is workable and within a set range of the target
Slump test
58
The difference in color across the surface of the concrete
Color Variation
59
Network of fine cracks across the surface of concrete
Crazing
60
Fine powder on the concrete surface
Dusting
61
Surface of concrete has bits washed away or has dents
Rain Damage
62
Chipped edges or joints, leaving an elongated cavity
Spalling
63
A white crystalline deposit found on the surface of concrete
Efflorescence
64
Too much coarse aggregate is added
Honeycombing
65
Hollow, low-profile bumps on the concrete surface
Blistering
66
Cracks that happen before the concrete hardens
Pre-setting Cracks
67
Cracks that happen after concrete hardens
Hardened Cracks
68
Forms after the concrete is placed while it is still plastic
Plastic Settlement Cracks
69
Appear in lines due to low humidity, usually 300-600mm long and 25mm-2m in length
Plastic Shrinkage Cracks
70
Bending or bulging of formwork may happen during placement and compaction
Formwork Movement
71
Cracks due to sudden changes in temperature
Thermal Shock
72
Cracks caused by drying, shrinkage, movement or setting of the ground, or placing higher load on the concrete than it was designed to carry
Hardened Crack

Construction Materials (3 decks)

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