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Question
Consider the following statements with reference to Water Bound Macadam (WBM) and Wet Mix Macadam (WMM)
    1.    WBM is a road mix and WMM is a plant mix. 
    2.    WBM usually has plastic filler, while WMM has non-plastic filler.
    3.    WBM is a modern road mix and WMM is a traditional road mix.
Which of the statement(s) given above is/are correct?
A.
1 and 2
B.
2 and 3 
C.
1 only
D.
2 only
Answer ( Option A)

1 and 2

Solution

Wet Mix Macadam (WMM) is modern road mix and contains the non-plastic filler and is mixed at the plant.
Water Bound Macadam (WBM) is a traditional road mix which consists of crushed or broken aggregates mechanically interlocked by rolling and voids filled with plastic filler (IP < 6%) and screening with assistance of water.

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