Road Materials and Bituminous Mixes

JKSSB Junior Engineer (Civil) · Highway Engineering · 22 practice questions with answers and explanations: 18 Easy, 4 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The softening point of bitumen is found by the:

  1. Penetration test
  2. Ring and ball test
  3. Flash point test
  4. Ductility test
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Answer: B. It gives the temperature at which the bitumen softens and sags.

Sample Easy question 2

The ductility test on bitumen measures its:

  1. Softening temperature
  2. Viscosity at 60°C
  3. Hardness
  4. Ability to stretch without breaking
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Answer: D. It is reported as the length in cm to which a briquette stretches before breaking.

Sample Easy question 3

A prime coat is applied:

  1. On a granular base before the bituminous layer
  2. Between two bituminous layers
  3. On a concrete pavement only
  4. On the shoulders only
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Answer: A. It seals the surface and binds the loose particles.

Sample Medium question 4

In viscosity grade bitumen VG-30, the viscosity at 60°C is about:

  1. 30,000 poise
  2. 30 poise
  3. 300 poise
  4. 3,000 poise
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Answer: D. VG-10, VG-20, VG-30 and VG-40 are graded by this viscosity.

Sample Medium question 5

An aggregate crushing value of 15% for road aggregate indicates:

  1. A strong aggregate
  2. An aggregate with high water absorption
  3. A very weak aggregate
  4. An aggregate that is too flaky
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Answer: A. A lower crushing value means a stronger aggregate.

Sample Medium question 6

In the Los Angeles abrasion test, 5,000 g of aggregate leaves 3,650 g on the 1.7 mm sieve after the test. The abrasion value is:

  1. 73%
  2. 27%
  3. 13.5%
  4. 54%
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Answer: B. Abrasion value = (loss ÷ original weight) × 100 = 1,350 ÷ 5,000 × 100 = 27%.

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