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Asphalt and Pavement Engineering: Q&A on Material Properties and Applications, Exams of Nursing

Valdosta State University (VSU)Nursing

A series of questions and answers related to asphalt and its applications in pavement construction. It covers topics such as the composition of asphalt cutbacks and emulsions, the temperature susceptibility of asphalt, and various tests used to assess its properties. Additionally, it addresses the components of hot-mix asphalt, the importance of optimum binder content, and methods of asphalt pavement recycling. The document also includes questions on wood properties relevant to civil engineering applications, such as anisotropic nature and moisture content calculation, providing a comprehensive overview suitable for civil engineering students and professionals. (415 characters)

Typology: Exams

2024/2025

Available from 08/25/2025

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ce 381 final Questions with Correct
Answers
Discuss the main uses of asphalt. - ANSWERSMain use is pavement construction, also
used in sealing of underground foundations and roofs.
What are the ingredients of asphalt cutbacks?
What are the ingredients of asphalt emulsions?
Name three uses of asphalt emulsion.
Why is asphalt emulsion preferred over asphalt cutback? - ANSWERSAsphalts
cutbacks - soft/medium/hard residue and volatile/less volatile/non volatile solvent
Asphalt Emulsions - emulsifying agent, emulsions and asphalt cement.
3 uses of asphalt emulsions - chip seal, slurry seal, cold mixed asphalt
Emulsion over cutback due to higher penetration quality.
Define what is meant by temperature susceptibility of asphalt. With the help of a graph
showing viscosity versus temperature, discuss the effect on the performance of asphalt
concrete pavements.
Are soft asphalts used in hot or cold climates? - ANSWERSViscosity of asphalt
decreases when temperature increases. Asphalt hardens and becomes brittle when the
temperature goes up and softens at higher temperature
Use soft asphalts in cold climates.
What are the engineering applications of each of these tests?a.flash point test
b.RTFO procedure
c.rotational viscometer test
d.dynamic shear rheometer test
e.penetration test - ANSWERSflash point test - temperature in which asphalt catches
fire, important to avoid on site hazards.
RTFO procedure - artificial aging of asphalt.
rotational viscometer test - calculates the viscosity of asphalt.
dynamic shear rheometer test - to calculate wear resistance
penetration test - to calculate consistency of asphalt
Discuss the aging that occurs in asphalt cement during mixing with aggregates and in
service.
How can the different types of aging of asphalt cement be simulated in the laboratory? -
ANSWERSAging is tested using RTFO(rolling thin film oven) and pressure aging
vessel.
RTFO puts asphalt binder into bottles with an air jet and rotates them in an oven.
Pressure aging vessel first uses RTFO then is aged under an air pressure for 24 hours.
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ce 381 final Questions with Correct

Answers

Discuss the main uses of asphalt. - ANSWERSMain use is pavement construction, also used in sealing of underground foundations and roofs. What are the ingredients of asphalt cutbacks? What are the ingredients of asphalt emulsions? Name three uses of asphalt emulsion. Why is asphalt emulsion preferred over asphalt cutback? - ANSWERSAsphalts cutbacks - soft/medium/hard residue and volatile/less volatile/non volatile solvent Asphalt Emulsions - emulsifying agent, emulsions and asphalt cement. 3 uses of asphalt emulsions - chip seal, slurry seal, cold mixed asphalt Emulsion over cutback due to higher penetration quality. Define what is meant by temperature susceptibility of asphalt. With the help of a graph showing viscosity versus temperature, discuss the effect on the performance of asphalt concrete pavements. Are soft asphalts used in hot or cold climates? - ANSWERSViscosity of asphalt decreases when temperature increases. Asphalt hardens and becomes brittle when the temperature goes up and softens at higher temperature Use soft asphalts in cold climates. What are the engineering applications of each of these tests?a.flash point test b.RTFO procedure c.rotational viscometer test d.dynamic shear rheometer test e.penetration test - ANSWERSflash point test - temperature in which asphalt catches fire, important to avoid on site hazards. RTFO procedure - artificial aging of asphalt. rotational viscometer test - calculates the viscosity of asphalt. dynamic shear rheometer test - to calculate wear resistance penetration test - to calculate consistency of asphalt Discuss the aging that occurs in asphalt cement during mixing with aggregates and in service. How can the different types of aging of asphalt cement be simulated in the laboratory? - ANSWERSAging is tested using RTFO(rolling thin film oven) and pressure aging vessel. RTFO puts asphalt binder into bottles with an air jet and rotates them in an oven. Pressure aging vessel first uses RTFO then is aged under an air pressure for 24 hours.

What are the components of hot-mix asphalt? What is the function of each component in the mix? - ANSWERScomponents are asphalt cement and aggregates. Asphalt cement binds aggregates together. Aggregates increase strength of the pavement. Why is it important to have optimum binder content in asphalt concrete? What would happen if a less-than-optimum binder content is used? What would happen if more than the optimum value is used? What is the typical range of binder content in asphalt concrete? - ANSWERSOptimum binder is important for keeping aggregates together. Less than optimum binder will not hold aggregate together or cover all of it, leading to failure of pavement. More than optimum will lubricate aggregates and lead to failure. Typical range is 4-7%. An asphalt concrete specimen has a mass in air of 1327.8 g, mass in water of 792.4 g, and saturated surface-dry mass of 1342.2 g. Calculate the bulk-specific gravity of the specimen. - ANSWERS(dry weight)/(saturated weight - submerged weight) For asphalt concrete, define a.air voids b.voids in the mineral aggregate c.voids filled with asphalt - ANSWERSAir voids - % of air present in mix Voids in mineral aggregate - ratio of the sum of the volume of the effective asphalt binder to the volume of voids to the total volume of the mixture. Voids filled with asphalt - ratio of the volume of the effective asphalt binder to the sum of the volume of the effective asphalt binder and the volume of the air voids Name three methods of asphalt pavement recycling. Which one of them is the predominant method? Briefly summarize this method - ANSWERSSurface, central plant, in-place recycling Predominant method is central plant. Old pavement is mined out and mixed with virgin asphalt binder and aggregates. State four advantages of recycling asphalt pavement materials. Why can we not mix the RAP materials with aggregates in a conventional hot-mix asphalt concrete plant? Show the proper ways of recycling the RAP materials in the two types of hot-mix asphalt plants. - ANSWERSAdvantages - 25% of the price of construction can be saved, energy of construction can be saved, reducing the dead load on bridges due to overlay of the pavements layers can be reduced, the problem of discarding the old materials can be solved.