CMGT3710

The force is recorded when the piston is penetrated into the soil how many inch or mm (depth)?

0.1 inch

What is the maximum percentage allowed by NCDOT for flat and elongated particles for a highway pavement?

10%

Asphalt pavements can be recycled and reused what percentage of the time?

100%

How many steel balls are put in to the LA Abrasion test drum?

11

If the contractor placed 650 tons of type S9.5B mix on a 12 foot wide and 5000 foot long roadway, what is the approximate rate of spread in pounds per square yard?

195

What is the approximate number of tons of I19.0C mix required to pave a one mile long, 24 foot wide roadway at the specified rate of 285 lbs per sq yard?

2000

It took _____ to complete the nation's ________ interstate highway system.

36 years 45,500 miles

In CBR soaking method, the material is soaked for how many days?

4 days

Asphalt concrete pavement that carry heavy traffic typically wants rutting less than

5 mm

PGAC grades vary from 46 oC to 82 oC, by 6 oC increments. Low temperature ranges from -10 oC to -46 oC. An asphalt binder of Performance Grade PG 58-28 would be suitable for pavements designed for maximum temperatures of

53 oC to 58 oC

Transportation asset management principles are widely considered to have been founded in what NCHRP report number?

551

NCDOT uses what ratio to define flat or elongated aggregate in hot mix asphalt

5:1

Which one of the following is the PGAC binder grade most commonly used by NCDOT?

64-22

All modern asphalt pavers consist of two main units

: the tractor and the floating screed.

If the paving job site is too far from the asphalt plant,

A portable plant should be used near the job site Material transfer vehicle (device) (MTV, or MTD) should be used does not matter Correct! 1 and 2

Most states have developed their own pavement design guides based on ___________

AASHTO 93

The functions of asphalt plant include:

Aggregate and asphalt storage; Aggregate and asphalt proportioning Mixture discharge and storage All of the above. (correct)

Consensus properties in hot mix asphalt aggregate include which of the following

Aggregate angularity

HMA Has three components, which are:

Air, asphalt cement, and aggregate

What group produces the Report Card for America's Infrastructure every two years?

American Society of Civil Engineers (ASCE)

Asphalt pavement can be recycled by

Cold in-place recycling; Hot in-place recycling; Full depth reclamation; Milling and HMA plant recycling

_______plant produce HMA continuously.

Drum

ERS stands for_____________ which considers the percent within limit (PWL) that is used for price deduction and bonus.

End Results Specification

ESAL stands for ________

Equivalent Single Axle Loads

Which of the following is an "E" of the asset management cycle?

Evaluate assets Estimate remaining service life Evaluate risk of failure Correct! All of the above

A 0.45 Power Chart does not attempt to describe the ideal combined aggregate gradation for hot mix asphalt

False

At a HMA paving site, compaction can not be estimated by establishing a rolling pattern

False

Concrete pavement has more layers than asphalt pavement.

False

Concrete pavements always have reinforcing bars

False

In CRCP, the main purpose of the reinforcing steel is to increase the strength of concrete slab.

False

Normal paving speeds range from 4-20 mph, depending on mix type and equipment performance.

False

What are the four basic soil types (according to ASTM standards)?

Gravel, sand, silt, and clay

From the following list, choose all the properties applicable to a rigid (concrete) pavement.

High modulus of elasticity, Act as beams, Has transverse contraction joints, Is more expensive to install

What type of mix is I19.0C?

Intermediate

From the follow list, choose the properties of flexible (asphalt) pavements

Is the predominate pavement type in the US, Is constructed in multiple layers, Yields elastically to traffic loading, Easy to maintain

Life Cycle Cost Analysis (LCCA) can help roadway designers

Make better cost effective pavement selection decisions

Which Federal legislation required states to develop a Transportation Asset Management Plan?

Map-21

The major difference between LA Abrasion Test and Micro-Deval Test is

Micro-Deval Test uses wet aggregate

NCDOT uses what two books to regulate the design and placement of hot mix asphalt on North Carolina roads.

NCDOT Standard Specifications Asphalt QMS Manual

Aggregate may come from which of the following sources:

Natural and gravel deposits Crushed rock Slag and mine refuse Correct! all of the above

Quality Assurance (QA) is carried out by _________ ; Quality Control (QC) is carried out by _________.

Owner; Contractor

Asphalt cement (or binder) is black liquid substance from ____________?

Production of crude oil

From which test, can a maximum density can be obtained?

Protor Test

In the framework of transportation asset management, which of the following is a goal of life cycle cost analysis?

Provide users with the level of service that meets their expectations

Highway pavements must be

Strong, durable, smooth, safe, secure, and economic.

California bearing ratio (CBR) test is for

Subgrade soil testing

SUPERPAVE stands for

Superior Performing Asphalt Pavements

Which type of asphalt coat is used to bond two asphalt layers together?

Tack

The term Ndes denotes

The number of gyrations in a SGC required to produce a sample with the same density as that expected in the field after the indicated amount of traffic

Three source properties tested for in hot mix asphalt aggregate include

Toughness Soundness Deleterious material

The AASHTO design method DOES require data input from which of the following?

Traffic Subgrade Environmental Conditions Materials

AADT stands for Average Annual Daily Traffic

True

Aggregate segregation is a condition where there is non-uniform distribution of the various aggregate sizes across the mat to the point where the mix no longer conforms with the specified job mix formula.

True

Air voids are necessary in hot mix asphalt to allow for slight compaction under traffic loading without causing bleeding

True

CBR stands for California Bearing Ratio

True

During paving, the asphalt mix is discharged into the receiving hopper of the paver as it pushes the rear tires of the haul truck. The mix is carried from the hopper to the rear of the machine by twin or single slat conveyors, and then on to the auger (screw conveyor) which distributes the mix laterally over the entire working width of the screed. The height of the auger is adjustable to allow for different layer thickness.

True

Flexible Pavement is also called asphalt pavement

True

Pavement must be evaluated before selecting the recycling method.

True

Superpave mix design varies from Marshall mix design because it grades asphalt binder based on climate conditions

True

The primary source for the type of pavement rutting shown in this picture is a weak asphalt mixture. (picture shows bumps wheels are in them)

True

There are a number of factors that need to be controlled during a paving operation. They include: Head of material (in front of the screed) Paving speed Actual layer thickness Surface evenness Paving width joints Laying temperature Mix segregation

True

To check the density or compaction of the HMA at the job site, a density gauge is normally used.

True

Today's pavement designs are developed using a mix of empirical and mechanistic data.

True

Viscosity of asphalt binder decreases (that is, binder becomes more fluid) as temperature increases.

True

Within the national rule, performance ratings of good, fair, and poor condition for pavements have been established by FHWA.

True

White topping is

a rehabilitation method to put concrete overlay on top of old pavement

Field density (compaction) test on asphalt pavements should be conducted

as soon as after the HMA is placed

The three elements of hot mix asphalt are

asphalt binder, aggregate, air

Geometric design is done ____________ pavement design, including two types of curves in the design design, _______ and ___________

before; horizontal; vertical

The three rolling phases are:

breakdown; intermediate, and finish

The three phases for asphalt paving compaction are:

breakdown; intermediate; and finish

What materials can be used for stabilizer for cold in-place and full-depth reclamation (FDR) recycling

cement lime foamed asphalt all above. (correct)

Pavement surface rutting can be caused by

coarse aggregate fine aggregate mix design Correct! all of the above

Which of the following are considered NCDOT key inspection areas?

determine mix temperature ensure smooth surface texture determine density

The goal of a TAMP is to create reactive approaches to management of transportation assets with little consideration for strategic management of the overall transportation network.

false

Pick 3 risks identified by Tennessee DOT in their TAMP from the list below.

flooding reduction in federal funds rock slides

The primary source of transportation funding in the US is

gas taxes

The task of a paver is to provide an even surface layer and give sufficient mix stability so that the roller can start the compaction process. It also has to provide a _________________.

homogeneous texture

What is the function of Materials Transfer Device (MTD)

keep the operation flowing smoothly and prevent segregation;

Precision milling can remove

low severity rutting

JPCP is usually use for

low traffic road

The technical requirements for aggregate used in HMA is ____ (than) those of the aggregate used in road base and subbase.

more rigorous

___________ pavement design options are completed, then _____________ is conducted, to determine the total cost of ownership as a means to decide which design option is selected.

multiple; life cycle cost analysis

Aggregates _____________ be dried before fed into the asphalt mixer.

must

In a hot-mix asphalt plant, Job Control Grading Band is

narrower than specified grading band

ESALs are used to predict __________

pavement performance

Antistripping agents are added to hot mix asphalt to

prevent the binder from separating from the aggregate

Laboratory tests for performance graded asphalt binders include which of the following

rolling thin film oven, dynamic shear rheometer, la abrasion test, bending beam rheometer

In pavement design, the ESAL value of 18,000 lb, is derived from

single axle dual tire

When the CBR test was developed, it was commonly believed the pavement failed because of

subgrade soil failure.

What are the three courses of pavements used by NCDOT

surface, base, intermediate

Asset management in the context of transportation assets includes both tangible and intangible assets

tangible intangible

Factors affecting compaction include

temperature thickness of the layer Speed of the paver Rolling pattern Correct! All of the above

The paver speed should be as constant as possible. Variations in speed will result in an uneven surface. An automatic system to preset and maintain speeds under varying load conditions is recommended. Paving speed is related to _______________.

the thickness and width of the HMA pad

Why is the aggregate sample washed after the LA Abrasion test?

to exclude the dust weight on the surface of coarse particles

A pressure aging vessel simulates the aging of asphalt binders.

true

An agency's financial plan must be a holistic approach reviewing and analyzing historical performance based on expenditures.

true

Asset management is "a systematic approach to the governance and realization of value from the things that a group or entity is responsible for, over their whole life cycles."

true

Three types of rollers are used to compact HMA:

vibratory; pneumatic-tired; and steel wheeled tandem rollers

VMA stands for

voids in mineral aggregate