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Consider the following statements regarding ductility of bitumen: 1. Ductility is the property which does not permit bitumen to undergo large deformation without breaking. 2. Bitumen with high ductility are generally adhesive but do not have good cementing properties 3. Ductility must be ascertained at two different temperatures in order to pronounce on the suitability of the material Which of the above statements are correct?

Consider the following statements regarding ductility of bitumen: 1. Ductility is the property which does not permit bitumen to undergo large deformation without breaking. 2. Bitumen with high ductility are generally adhesive but do not have good cementing properties 3. Ductility must be ascertained at two different temperatures in order to pronounce on the suitability of the material Which of the above statements are correct? Correct Answer 3 only

Ductility of a bituminous material is measured by the distance in centimetres to which it will elongate before breaking when two ends of standard briquette specimen of material are pulled apart at a specified speed and specified temperature.

Statement I & II: False

It measures adhesiveness and elasticity of bitumen. It permits bitumen to undergo large deformation without breaking.

Binder material having insufficient ductility gets cracked when subjected to repeated traffic loads. Therefore, a bitumen binder must have sufficiently ductility.

High ductility → bitumen can undergoes large deformation → Good quality bitumen or strong cementing properties.

Statement III: True

This statement seems as on increasing the temperature ductility increases. As per IS 1208:1978, ductility is measured at temperature of 270C, but at road where bitumen is applied has temperature of 35-450 C in hot areas. Therefore, by measuring ductility at 270 C and some other suitable temperature (say 400C) gives economical content of bitumen as such on increasing temperature ductility increases i.e. bitumen becomes more stronger or has more cementing properties and hence, requirement of bitumen may reduce. 

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