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Metalling of road usually consists of ______ layers of coats.(a) 5(b) 3(c) 2(d) 6 |
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Answer» Correct choice is (b) 3 Easiest explanation: The soiling coat, inter coat and top coat. The metal may be stone ballast, brick ballast, kankar, etc. The inter coat and top coat are made with 12 cm (4 1/2 ”) thick layer loose compacted to 8 cm (3”). The soiling coat may be of brick flat or brick on edge, or of stone boulder or of same type as for the inter or top coat if the sub-soil is good, or may be of greater. The top or wearing coat may also be of cement concrete bituminous. |
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