This set of Highway Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Stabilization of Soil Using Bituminous Materials”.
1. What is the basic principle of bituminous stabilisation?
a) Water proofing
c) Water proofing with cohesion
Explanation: The principle of the bituminous stabilisation mix is to impart strength by cohesion and water proofing.
2. Which is the most commonly used bitumen?
b) VG 70
d) VG 30
Explanation: The most commonly used bitumen is cutback and emulsion, depending on the requirements.
3. The bituminous layer can be used in which layer of the pavement in low rainfall areas?
a) Sub grade
b) Sub base
Explanation: The bituminous stabilisation road can be used in the sub base, base and even surface course if there is low rainfall.
4. The soil not preferred in bituminous mix is __________
Explanation: All the soils other than clay are having high permeability, high clay content is not desirable as it expands.
5. The increase in strength in soil may be seen at an age of __________
a) 3 days
b) 7 days
c) 28 days
d) 56 days
Explanation: The strength of the soil increases up to a certain limit and then decreases, but for clay it will increase if soaked for long period like 28 days.
6. The OMC of bitumen binder is taken as __________
Explanation: The OMC is usually considered based on experience, but it may be taken anywhere between 4 and 6%.
7. The stability of the bituminous mix is always __________
a) Greater than water content
b) Lesser than water content
c) Equal to water content
d) Can’t determine
Explanation: If a graph is drawn between the bitumen content and maximum dry density its stability is always greater than water content.
8. The higher compaction will result in __________
a) Less stability
b) Less strength
c) Less absorption of water
d) High absorption of water
Explanation: The higher resistance to the absorption of water can be achieved by the higher compaction effort.
9. The liquid limit of soil bitumen mix should be less than __________
Explanation: The liquid limit of the soil based on practical considerations should be less than 40%, it is even good if it is lesser.
10. The bitumen giving more better results is __________
c) VG 30
d) VG 40
Explanation: The emulsion gives an inferior result when compared with the cutback, so the cutback is the most preferred bitumen.
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