What is the primary purpose of a tack coat in hot-mix asphalt paving?
Bituminous Surface Treatments And Pavements
Question · Easy
A prime coat is typically applied to which surface?
Using 110 lb per square yard per inch of compacted thickness, how many tons of dense-graded HMA are needed for a 24 ft wide by 500 ft long lane at 2 in compacted thickness? (Ignore waste.)
Question · Hard
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Which statement best describes cold-mix asphalt compared with conventional hot-mix asphalt (HMA)?
A chip seal (bituminous surface treatment) consists primarily of:
If HMA has a compacted density of 145 lb/ft³, how many tons are required for 10,000 ft² at a compacted thickness of 1.5 inches?
Why is timely compaction critical for hot-mix asphalt after placement?
Typical delivery/placement temperatures for conventional dense-graded HMA (not warm-mix) are most often in which approximate range, depending on binder grade and specifications?
Question · Medium
In a typical HMA roller train, what is the main purpose of the breakdown (initial) roller?
What does a Superpave performance-graded (PG) binder designation such as PG 64-22 primarily communicate?
Excessive air voids in compacted HMA most commonly lead to which performance problem?
Nuclear density gauge readings on an HMA mat are most often used to:
A project requires 94% of theoretical maximum density (Gmm). If Gmm unit weight is 155 lb/ft³, what minimum in-place density is required?
What is the primary function of a paver screed?
Longitudinal joints in HMA are best constructed when the adjacent lane’s edge is:
A fog seal is best described as:
Segregation in an HMA mat typically appears as:
A slurry seal is primarily used to:
How many gallons of undiluted emulsion are needed for 2,400 SY if residual asphalt is specified at 0.05 gal/SY and the emulsion contains 50% asphalt residue?
Before placing a tack coat on an existing asphalt surface, the contractor should primarily:
What is the main purpose of a pneumatic (rubber-tire) roller on asphalt work?
Raveling of an asphalt surface is best described as:
A transverse cold joint occurs when:
If a mat is 12 ft wide and nuclear gauge tests show average density of 142 lb/ft³ while target is 148 lb/ft³, what is the approximate percent of target density achieved?
What is the principal reason distributors apply asphalt binders for surface treatments at controlled rates and temperatures?
Bleeding (flushing) of an asphalt surface is characterized by:
For a parking lot 180 ft by 120 ft paved 3 inches thick, using 110 lb/SY/in, approximately how many tons of HMA are required? (Ignore waste.)
What is the primary purpose of milling (cold planing) existing asphalt before an overlay?
Asphalt emulsion is best described as:
Cutback asphalt differs from asphalt emulsion mainly because cutback asphalt:
A contractor places 180 tons of HMA over 3,000 SY. What is the average yield in pounds per square yard?
What is the main advantage of a material transfer vehicle (MTV) or remixing device ahead of the paver?
Open-graded friction course (OGFC) differs from dense-graded HMA mainly because OGFC:
If mix arrives on site at 310°F and ambient/base conditions cause rapid cooling, the most appropriate immediate response is typically to:
What does “percent air voids” in compacted HMA represent?
A full-depth asphalt patch for a pothole should generally include:
Recycled asphalt pavement (RAP) in new HMA is used primarily to:
If theoretical maximum specific gravity Gmm is 2.500 and bulk specific gravity Gmb of a core is 2.350, the air voids are approximately:
Why must trucks hauling HMA be properly insulated or tarped as specified?
A sand seal is primarily intended to:
What is the primary purpose of a tack coat “break” before paving over emulsion tack?
Which rolling practice is most likely to cause checking (short surface cracks) in an HMA mat?
Stone-matrix asphalt (SMA) is primarily designed to:
Warm-mix asphalt (WMA) technologies are used mainly to:
A project places two HMA lifts of 1.5 inches each over 4,000 SY. Using 110 lb/SY/in, total tons for both lifts (ignore waste) are:
The main reason to keep a uniform head of mix in front of the paver screed is to:
Which condition most strongly suggests inadequate tack coat application?
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