standard specifications for public works construction city of west .Surplus Material. 302. MATERIALS SPECIFICATIONS. 302.1. General. 302.2. Subgrade. 303 ... granular material resulting from the mechanical crushing of.subgrade material crusher,Subgrades & Subbases for Concrete Slabs - The Concrete NetworkJul 31, 2018 . Guide to subgrades and subbases, which support concrete slabs. . The subbase material is usually a reasonably low cost gravel without a lot.
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