Page 73 - Lecture Notes DCC3113

FEEDBACK ON EXERCISE 4
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1. State FOUR (4) methods for the construction of road base course in flexible pavement
 Macadam Crusher-Run Road Base (4 marks)
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 Dry Bound Macadam Road Base
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 Wet-Mix Road Base
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 Bituminous Roadbase
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 Cement-Treated Base
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

2. State FOUR (4) adventages of using flexible pavement in Malaysia
 To provide a level/flat surface for a more comfortable and safe journey (4 marks)
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 To receive and distribute the load of the vehicle to the ground layers
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 To protect the sub-grade layers from damage due to exposure of climate change.
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 To provide a level/flat surface for a more comfortable and safe journey
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 To receive and distribute the load of the vehicle to the ground layers
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 To protect the sub-grade layers from damage due to exposure of climate change
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3. Describe the functions and application of prime coats during road construction of flexible
pavement
(8 marks)

 Is a sprayed application of a cutback or emulsion asphalt applied to the surface of untreated roadbase using
pressure distributor at the rate of 0.5 – 1 liter/m2

 Is poured between the road base surface and binder course
 The temperature must be according to the specifications stipulated.

 MC-70 (50°C -70°C), SS-1K (25°C - 45°C) cured for 24 hours to achieve maximum penetration
 The function of prime coat are

- Coat and bond any lose material

- Harden or toughen the surface
- Waterproof the base during construction

- Plug capillary voids
- Provide adhesion between the base and the next course

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