Fill in the blank. This Superpave procedure (test) is used to stimulate the long
ID: 1712772 • Letter: F
Question
Fill in the blank.
This Superpave procedure (test) is used to stimulate the long-term aging of asphalt binders during an asphalt pavement’s service life: __________________________________.
This test is used to ensure that asphalt products are safe to pump and handle at elevated temperatures: ____________________________________________________.
Under the Superpave asphalt binder specification, the specified test criteria for a binder remain constant, while the ______________ at which the binder must meet the criteria changes with grades.
5,6. Natural sands and gravels are typically obtained from ___________________, while manufactured aggregates are typically obtained from ___________________.
Good stockpiling practices are necessary to prevent _______________________ within the individual stockpile.
From a construction standpoint, the optimum lift thickness is ________________ times the nominal maximum aggregate size.
For an aggregate, the ratio of a weight of a unit volume of the aggregate to the weight of an equal volume of water at room temperature is the aggregate’s ______________________.
The specific gravity of coarse aggregate is measured for all material retained on the___________________________________ sieve and larger.
The maximum dimension to minimum dimension ratio tested in the Flat & Elongated Particle test is _____________________________.
A specimen with a mass of 5000 g and a Gmb of 2.500 has a volume of ____________ cm3.
The two AASHTO specifications that deal with the Superpave mix design process are AASHTO M ___________ and R ___________.
If the aggregate batch weight is 4800 g and you want a mixture with 4.9% binder by total mix weight, add _________ g of binder.
The Dust Proportion of a Superpave mix is the ratio of the % passing the No. 200 sieve to the % _______________________.
Section 2. Multiple choice.
You are a maintenance supervisor planning a chip seal (surface treatment) on a route you maintain. You know that your source of aggregate will be a stockpile of limestone chips, and this aggregate bears a positive surface charge. Which type of emulsion would you choose?
Cationic
Anionic
Superpave
Trinidad Lake
Air blown asphalts are generally best suited for:
asphalt concrete
open-graded bituminous bases
high-volume expressway overlays
roofing materials
Which of the following are “lighter fractions” (as opposed to asphalt) of the petroleum refining process? (Circle all that apply)
Tar
Naphtha
Gasoline
Kerosene
Light Gas Oils
For the purposes of mix design, it is important that aggregate sampling be:
randomly sampled
representative
from the plant stockpiles
all of the above
both (a) and (b)
The L.A. Abrasion test is performed on:
coarse aggregate
fine aggregate
both coarse and fine aggregate
the finished asphalt pavement surface
The volume used in the calculation of Gse is:
the volume of the aggregate plus the volume of the water permeable voids
the volume of the aggregate plus the volume of the water permeable voids minus the volume of absorbed binder
the volume of the aggregate minus the volume of the water permeable voids
the volume of the aggregate plus the volume of the absorbed binder.
Select the volumetric property or properties that cannot be tested for directly, but must be calculated from the test results from other volumetric parameters:
Gse
Gmm
Gmb
Gsb
Gb
Section 3. Short answer and problem solving. Points indicated in parentheses.
24.(5) Briefly describe what is meant by “breaking” of an asphalt emulsion.
25.(5) Why is short-term oven aging important in the mix design process? Do the aging times always match up with the field aging times, and what difference does that make, if any?
26.(5) Briefly list at least 4 improvements that the Superpave binder specification has brought to the asphalt industry that were not possible under the old Viscosity or Penetration grading systems:
27.(9) In your own words, define Voids in the Mineral Aggregate (VMA) and tell why it is important.
29.(10) Answer the following:
For the Superpave mix design, give the information of “nominal maximum size” and “maximum aggregate size”.
(b) Considering the definitions you provided above, fill in the following table:
Agg Q-4
Agg R-4
Agg S-4
Agg T-4
Sieve Size
% Passing
% Passing
% Passing
% Passing
1-1/2”
100
100
100
100
1”
100
100
96
92
3/4”
100
98
94
83
1/2”
98
19
86
76
3/8”
92
3
70
69
No. 4
78
1
59
52
Aggregate:
Nominal Maximum Size:
Maximum Size:
Q-4
R-4
S-4
T-4
Agg Q-4
Agg R-4
Agg S-4
Agg T-4
Sieve Size
% Passing
% Passing
% Passing
% Passing
1-1/2”
100
100
100
100
1”
100
100
96
92
3/4”
100
98
94
83
1/2”
98
19
86
76
3/8”
92
3
70
69
No. 4
78
1
59
52
Aggregate:
Nominal Maximum Size:
Maximum Size:
Q-4
R-4
S-4
T-4
Explanation / Answer
1) This Superpave procedure (test) is used to stimulate the long-term aging of asphalt binders during an asphalt pavement’s service life: Pressure Aging vessel (PAV)
2) This test is used to ensure that asphalt products are safe to pump and handle at elevated temperatures:
Rotational Viscometer test
3) Under the Superpave asphalt binder specification, the specified test criteria for a binder remain constant, while the temperature at which the binder must meet the criteria changes with grades.
4) Natural sands and gravels are typically obtained from
kames, eskers, deltaic deposits, moraines, outwash plains, and old lake beds and shorelines
while manufactured aggregates are typically obtained from
Hard rock, Sedimentary rock minerals, slag crushed stone
5) Good stockpiling practices are necessary to prevent contamination caused due to water drainage or runoff that transports harmful bacteria or other contaminants into the stockpile, within the individual stockpile.
6) From a construction standpoint, the optimum lift thickness is four times the nominal maximum aggregate size.
7) For an aggregate, the ratio of a weight of a unit volume of the aggregate to the weight of an equal volume of water at room temperature is the aggregate’s Specific Gravity.
8) The specific gravity of coarse aggregate is measured for all material retained on the 4.75mm sieve and larger.
9) he maximum dimension to minimum dimension ratio tested in the Flat & Elongated Particle test is to determine the percentages of flat particles, elongated particles, or flat and elongated particles in coarse aggregates.
10) he two AASHTO specifications that deal with the Superpave mix design process are AASHTO M 323-12 and R 59
11) The Dust Proportion of a Superpave mix is the ratio of the % passing the No. 200 sieve to the % by mass of aggregate.
12) Air blown asphalts are generally best suited for:
open-graded bituminous bases
13)The L.A. Abrasion test is performed on:
coarse aggregate
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