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The thickness of sub-base can range from 75 to 100 mm (3 to 4 in) for garden paths through 100 to 150 mm (4 to 6 in) for driveways and public footpaths, to 150 to 225 mm (6 to 9 in) for heavy used roads, and more for highways. ------------------------------ Mohd Imran Aff.M.ASCE Afzalgarh 9191 ...
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