CE 337 - EXAM #4 HMA QUESTIONS AND CORRECT
ANSWERS
Emulsions are mixtures of asphalt cement and petroleum solvents - Answers - False
The three major components of asphalt cement are...? - Answers - Asphaltenes, oils,
resins
Viscosity grade specifications can be adopted for binder characterization at very low
temperatures - Answers - False
Penetration test can be adopted for binder characterization at very high temperatures -
Answers - False
The absolute viscosity test is performed at what temperature? - Answers - 60C
The binder penetration test is performed at what temperature? - Answers - 77F or 25F
(Room Temp)
Asphalt binder is a visco-elastic material because its stiffness is a function of...? -
Answers - Temperature & rate of loading
What distress is considered to characterize a low temperature behavior of PG binder? -
Answers - Transverse Cracking
In performance graded asphalt binder, rutting in HMA represents its high temperature
behavior? - Answers - True
In SuperPave binder specifications, RV (rotational viscometer) is used to determine...? -
Answers - High temperature behavior (Mixing & compaction temperatures)
In superpave binder specifications, DSR (dynamic shear rheometer) is used to
determine...? - Answers - High & intermediate temperature behaviors
In superpave binder specifications, BBR (bending beam rheometer) is used to
determine...? - Answers - Low temperature behavior
PG 64-22 binder can be used in locations where...? - Answers - High pavement surface
temperature varying from 64 to -22C with 98% reliability
When the phase angle for a material is zero, it can be characterized as...? - Answers -
Elastic
, The 25mm plate diameter is used in DSR for characterizing a binder at...? - Answers -
High temperature. 8mm plate diameter can be used for intermediate temperatures.
G*/sin(delta) property is used for characterizing fatigue cracking for asphalt binder -
Answers - False.
G*sin(delta) property is used for characterizing rutting for asphalt binder - Answers -
False
RTFO (rolling thin film oven) is used for aging binders to simulate short-term aging -
Answers - True
PAV (pressure aging vessel) is used for againg binders to simulate long-term again -
Answers - True
The required PG of a binder is determined by using...? - Answers - Temperature data
for a location
A HMAC sample has the following volumetric properties (i) VMA=0.1865 ft^3 & (ii) Vol of
air=0.0452 ft^3. What is the %VFA for this sample? - Answers - 75.8%
The weight of a HMA compacted specimen in air is 1315 gm, weight in SSD condition is
1360 gm & the weight under water is 808 gm. Based on this information, what is the
Gmb & unit weight of the sample? - Answers - Gmb=2.382 & UW= 148.65 lb/ft^3
The rolling thin film oven test is performed at what temperature? - Answers - 375F
Absolute viscosity test is performed at what temperature? - Answers - 140F
A material whose stiffness is a function of temperature & rate of loading is defined as
a...? - Answers - Visco-elastic material
The PAV test characterizes the________ of liquid asphalt - Answers - The PAV test
characterizes the long term aging of liquid asphalt
For a pure elastic material, what is the phase angle between the shear stress & stress?
- Answers - 0 deg (strain in-phase)
For a pure viscous material, what is the phase angle between the shear stress and
strain? - Answers - 90 deg (Strain out-of-phase)
Performance graded asphalts address potential for the following pavement distresses: -
Answers - Rutting, fatigue, low temp cracking
The susceptibility of pavement rutting can be quantified by performing which test? -
Answers - DSR Test.
ANSWERS
Emulsions are mixtures of asphalt cement and petroleum solvents - Answers - False
The three major components of asphalt cement are...? - Answers - Asphaltenes, oils,
resins
Viscosity grade specifications can be adopted for binder characterization at very low
temperatures - Answers - False
Penetration test can be adopted for binder characterization at very high temperatures -
Answers - False
The absolute viscosity test is performed at what temperature? - Answers - 60C
The binder penetration test is performed at what temperature? - Answers - 77F or 25F
(Room Temp)
Asphalt binder is a visco-elastic material because its stiffness is a function of...? -
Answers - Temperature & rate of loading
What distress is considered to characterize a low temperature behavior of PG binder? -
Answers - Transverse Cracking
In performance graded asphalt binder, rutting in HMA represents its high temperature
behavior? - Answers - True
In SuperPave binder specifications, RV (rotational viscometer) is used to determine...? -
Answers - High temperature behavior (Mixing & compaction temperatures)
In superpave binder specifications, DSR (dynamic shear rheometer) is used to
determine...? - Answers - High & intermediate temperature behaviors
In superpave binder specifications, BBR (bending beam rheometer) is used to
determine...? - Answers - Low temperature behavior
PG 64-22 binder can be used in locations where...? - Answers - High pavement surface
temperature varying from 64 to -22C with 98% reliability
When the phase angle for a material is zero, it can be characterized as...? - Answers -
Elastic
, The 25mm plate diameter is used in DSR for characterizing a binder at...? - Answers -
High temperature. 8mm plate diameter can be used for intermediate temperatures.
G*/sin(delta) property is used for characterizing fatigue cracking for asphalt binder -
Answers - False.
G*sin(delta) property is used for characterizing rutting for asphalt binder - Answers -
False
RTFO (rolling thin film oven) is used for aging binders to simulate short-term aging -
Answers - True
PAV (pressure aging vessel) is used for againg binders to simulate long-term again -
Answers - True
The required PG of a binder is determined by using...? - Answers - Temperature data
for a location
A HMAC sample has the following volumetric properties (i) VMA=0.1865 ft^3 & (ii) Vol of
air=0.0452 ft^3. What is the %VFA for this sample? - Answers - 75.8%
The weight of a HMA compacted specimen in air is 1315 gm, weight in SSD condition is
1360 gm & the weight under water is 808 gm. Based on this information, what is the
Gmb & unit weight of the sample? - Answers - Gmb=2.382 & UW= 148.65 lb/ft^3
The rolling thin film oven test is performed at what temperature? - Answers - 375F
Absolute viscosity test is performed at what temperature? - Answers - 140F
A material whose stiffness is a function of temperature & rate of loading is defined as
a...? - Answers - Visco-elastic material
The PAV test characterizes the________ of liquid asphalt - Answers - The PAV test
characterizes the long term aging of liquid asphalt
For a pure elastic material, what is the phase angle between the shear stress & stress?
- Answers - 0 deg (strain in-phase)
For a pure viscous material, what is the phase angle between the shear stress and
strain? - Answers - 90 deg (Strain out-of-phase)
Performance graded asphalts address potential for the following pavement distresses: -
Answers - Rutting, fatigue, low temp cracking
The susceptibility of pavement rutting can be quantified by performing which test? -
Answers - DSR Test.
