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Question
In the penetration macadam construction, the bitumen is
A.
Sprayed after the aggregates are spread and compacted
B.
Premixed with aggregates and then spread
C.
Sprayed before the aggregates are spread and compacted
D.
Premixed with aggregates and then spread and compacted
Answer ( Option A)

Sprayed after the aggregates are spread and compacted

Solution

Penetration Macadam:
(i) Bituminous penetration macadam or grouted macadam is used as base or binder course.
(ii) The coarse aggregate are first spread and compacted well in dry state and after that hot bituminous binder of relatively high viscosity is sprayed in fairly large quantity at the top. 
(iii) The bitumen penetrates into the voids from the surface of the compacted aggregates, thus filing up a part of the voids and binding some stone aggregates together. 
(iv) Full grout is adopted in regions of heavy rainfall and semi grout is adopted in regions of moderate rainfall and traffic.

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