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Question
Among the following, the correct sequence of WBM construction will be:
i. Preparation of subgrade
ii. Spreading of coarse aggregates 
iii. Application of binding material 
iv. Application of screenings
v. Provision of lateral confinement
A.
i, ii, iv, iii, v
B.
i, iv, ii, iii, v
C.
i, v, ii, iv, iii
D.
ii, i, iv, v, iii
Answer ( Option C)

i, v, ii, iv, iii

Solution

Water Bound Macadam Roads: 
• In this method, the broken stones of the base course and surface course, if any, are bound by the stone dust in presence of moisture. 
• The roads whose wearing course consist of clean crushed aggregates, mechanically interlocked by rolling and bound together with filler material and water and laid on a well compacted base course, is called water bound macadam road. 
• The correct sequence of WBM preparation is: 
   1. Preparation of subgrade
   2. Provision of lateral confinement 
   3. Spreading of coarse aggregates 
   4. Application of screenings 
   5. Application of binding material

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