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Asphalt Binders Exam 2 Questions with 100% Verified solutions| Graded A+
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Asphalt Binders Exam 2 Questions with 100% Verified solutions| Graded A+
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Asphalt Binders Exam 2 Questions with100% Verified solutions| Graded A+
What is viscosity? - ✔✔the ratio between the applied shear stress and the rate of shear strain
Why is viscosity an important test to perform on asphalt? - ✔✔a relationship between temperature and
viscosity can be determined, and there exist ranges of compaction and mixing
What does superpave stand for? - ✔✔superior performing pavement
What is asphalt binder selection dependent on in superpave specifications? - ✔✔performance
(rutting, fatigue cracking, low temperature cracking)
What is the basic superpave specification? - ✔✔performance grade (PG), which is based on
physical properties
What affects the superpave specification? How does it affect it? - ✔✔climate; the first number is
the average 7-day maximum pavement temperature, and the second number is the minimum
pavement temperature
, What criteria must be considered when selecting an asphalt binder? - ✔✔1. geographic area
2. air temperature
3. pavement temperature
4. loading type
5. reliability
What were superpave specifications developed from? - ✔✔air temperatures
How does testing for performance grade work? - ✔✔test the same type of asphalt for multiple
temperatures until the sample fails to meet the specification requirement; the asphalt belongs to the
grade based on the last temperature that passed the specification
What are the four performance grade binder tests? What do they help simulate? - ✔✔1.
Rotational Viscometer (RV); temperature-viscosity relationship
2. Direct Shear Rheometer (DSR); rutting & fatigue cracking
3. Bending Beam Rheometer (BBR); low-temperature cracking
4. Direct Tension Tester (DTT); low-temperature cracking
What is aging as it relates to asphalt? - ✔✔asphalt is a petroleum product and oxidizes and hardens
over time
What are two binder aging methods? - ✔✔1. Rolling Thin Film Oven (RTFO); simulates manufacture and
construction aging
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