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Highway Pavements Lecture 3: Asphalt Binders

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Highway Pavements Lecture 3: Asphalt Binders

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Questions and Answers

What is the purpose of determining the viscosity of asphalt binder?

To determine the temperature of mixing and compaction

To determine the ductility of the asphalt

To determine its ability to coat aggregate particles (correct)

To determine the aggregate particle size

What is the purpose of the softening point test?

To evaluate the evaporation characteristics of the asphalt

To determine the ductility of the asphalt

To measure the susceptibility of asphalt to temperature changes (correct)

To determine the flash point of the asphalt

What is the temperature at which the penetration test is conducted?

35 ℃

25 ℃ (correct)

20 ℃

30 ℃

What is the purpose of the distillation test?

To evaluate the evaporation characteristics of the asphalt Signup and view all the answers

What is the definition of a ductile asphalt binder?

One that undergoes considerable stretching before failure Signup and view all the answers

What is the purpose of the flash point test?

To determine the temperature at which the asphalt ignites Signup and view all the answers

What is the main difference between asphalt cement and asphalt cutback?

Asphalt cement is semi-solid, while asphalt cutback is liquid Signup and view all the answers

What is the purpose of the emulsifying agent in emulsified asphalt?

To provide electrical charges to the droplets of asphalt binder Signup and view all the answers

What is the term used to describe the hardening of asphalt binders due to steric hardening and oxidative aging?

Aging Signup and view all the answers

What is the effect of temperature on the consistency of asphalt materials?

The increase of temperature liquifies the asphalt, while the decrease of temperature solidifies it Signup and view all the answers

What type of asphalt binder is obtained by flexing the asphalt cement with a light distillate?

Rapid curing cutback Signup and view all the answers

What is the purpose of heating the aggregates and asphalt cement prior to mixing?

To reduce the viscosity of the asphalt cement Signup and view all the answers

What is the term used to describe the process of increment of material consistency as it loses solvent or water by evaporation?

Curing Signup and view all the answers

What is the effect of oxidation on the asphalt binder?

It hardens the asphalt binder Signup and view all the answers

What is the term used to describe the evaporation of light hydrocarbon components from the asphalt binder?

Volatilization Signup and view all the answers

What is the purpose of a rotational viscometer in asphalt testing?

To measure the viscosity of asphalt Signup and view all the answers