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Aspahlt exam Flashcards

1
Q

Order in least to greatest moisture (OD, Air dry, Wet, SSD)

A

oven dry, Air dry, SSD, Damp and wet

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2
Q

Which moisture states have no external moisture (OD, Air dry, Wet, SSD)

A

SSD, Air dry, Oven dry

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3
Q

Which moisture states have no internal moisture (OD, Air dry, Wet, SSD)

A

Oven dry

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4
Q

How to get a volume from only a measurement of two weights

A

Boyant force, it is proportional to the volume displaced in water

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5
Q

What is the source of asphalt binder for roads

A

Residual from refining crude oil

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6
Q

What does PG 58 -28

A

Performance Grade, Max temp 58 degrees C, min temp -28 degrees C

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7
Q

If rutting is caused by asphalt binder what caused the problem

A

Max PG needs rasied, Viscosity is too low in high heat

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8
Q

What causes thermal cracking from the asphalt binder

A

Min PG needs lowered

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9
Q

What are the four Source properties

A

Tougness, Soundness, Deleterious Materials, Gradation

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10
Q

What is the test for toughness

A

LA abrasion test, measure resistance to abrasion and impact

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11
Q

What test is for soundness

A

Grow salt crystals in the aggregate, measures resistance to simulated freeze and thaw

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12
Q

What is the test for Deleterious materials

A

Clay lumps and friable particles, Breaks apart soft material and remove from sample (soft particles)

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13
Q

What is the test for gradation?

A

Sieve analysis, determines particle sizes

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14
Q

What are the four consensus properties?

A

Coarse aggregate angularity, Flat and elongated, Fine aggregate angularity, clay content

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15
Q

What is coarse aggregate angularity

A

Aggregate needs adequate friction

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16
Q

What is flat and elongated

A

an aspect ratio, the aggregate can be easily broken

17
Q

What is Fine aggregate angularity

A

Low angularity sands have stability and surface rutting problems, round fine aggregate aren’t as stable and will compact later

18
Q

What issues does clay content cause?

A

Fine particles have a large surface area, needs more binder

19
Q

Does a lower Fineness modulus need more or less binder

A

It needs more binder

20
Q

What is NMAS, and does a higher NMAS need more or less binder

A

Nominal maximum aggregate size, the bigger the NMAS the less binder needed

21
Q

What is the goal of superpave mix design step one

A

Select materials, aggregate and PG binder

22
Q

What is the goal of superpave mix design step two

A

Select aggregate blend

23
Q

What is the goal of superpave mix design step three

A

Determine aspahlt content (binder). Graph at 4% air voids (Va)

24
Q

What is the goal of superpave mix design step four

A

Moisture sensitivity test

25
How is the agg. blend determined in a batch plant
It is weighed in the batch tower
26
How is the agg. blend determined in a Drum mix plant
Cold feed bins, heigh of gate and speed of conveyer
27
How is the amount of binder controlled in a batch plant
Weighed in the batch tower
28
How is the appriorate amount of binder controlled in a drum mix plant
The weigh bridge knows the flow rate of agg. and a computer matches with the needed amount of binder
29
How is the agg. and binder mixed in a batch plant
In the pugmill
30
How is agg. and binder mixed in a Drum mix plant
In the mixing drum
31
What goes the same direction as airflow in a parallel mixing drum
Aggregate and air goes the same direction
32
What type of Drum mixing plant do air and aggregate go in opposite directions
Counterflow mixing drum
33
Where is RAP added in a mixing drum
After combustion
34
- List the follow in order of events Paving machine Vibratory compactor Asphalt mix discharge from storage silo Material transfer material Tack coat Mix agg. and asphalt binder Smooth steel compactor Haul truck
1. Mix agg. and asphalt binder 2. Asphalt mix discharge from storage silo 3. Tack coat 4. Haul truck 5. Material transfer material 6. Paving machine 7. Vibratory compactor 8. Smooth steel compactor
35
What is the purpose of a material transfer vehicle
Keeps HMA warm and ready from haul truck and will unload into paver
36
What are common sources of agg.
Gravel, crushed limestone, recycled concrete, and steel slag
37
What does the Sand equivalency test used for
To assess the amount of clay particles in a sample
38
Why does ASTM C33 limit the fines
An excessive amount of fines can give it a low abrasion resistance

CE materials (6 decks)

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