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BOS 163-12:2007 ed.1
P444.60
Civil engineering construction- Part 12: Earthworks (Roads, subgrade) – Specification
Description
This Botswana Standard covers; a) the construction, up to and including the selected layer, of the subgrade in new roads, b) the reconstruction of existing roads, and c) except where BOS 163-33 forms part of the contract document, the construction of gravel road surfaces in urban and industrial areas. urban and industrial areas. It covers construction of cuts within the road prism and intersections, removal to spoil of unsuitable or excess material, compaction of the road bed, construction and compaction of fills and the selected layer using material from cuts in the road prism or from approved borrow pits, and finishing of cuts and fills, up to the stage where the subgrade is ready for the placing of the subbase or base (or both) and the shoulders. NOTE Subbase and base are dealt with in BOS 163-33 and BOS 163-34 respectively.