construction of sub-grade or sub-base (part of the roads) 3. The impacts of problematic soils in Ethiopia on road construction and maintenance 4. The usage of Water bound Macadam (WBM) as surfacing Material on unpaved roads: A case study in Dire-Dawa 5. Soil nature and materials suitability for road construction and maintenance 6. Read MoreRoad Building, Borrow Pits, Construction Material. 3.4 that all parties in the bigger picture of aggregate mining, which includes sand mining, gravel mining recognises that the consequences of the depletion of the construction aggregate resources will have a serious impact on the economy. the viability of s.a. aggregate resources is fundamental for the …

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