Design Value Of Cbr For A Soil Subgrade Layer Spreading
4bc16de163 Finishing . In cut areas consisting of cohesive soils, it may be necessary to remove the subgrade material and replace it with sequential lifts capable of being compacted to the required density. As in subgrade-compaction operations, obtaining the specified compacted density requires that the material be placed and compacted at a moisture content inside the specification block. SUBGRADE COMPACTION--SPECIAL CASES . References 1) D.
Natural, processed, and other materials are used for base courses. Cookies are required to use this site. Figure 3 California Bearing Ratio Vs Moisture content. A wide variety of gravels; sands: gravelly and sandy soils; and other natural materials such as lime rock, coral, shells, and some caliches can be used alone or blended as a suitable base course. The total penetration should not exceed 7.5mm. Table 5-5. Unfortunately this is normally extremely variable as water can come from many sources such as rainfall, capillary action, seasonal movement of the water table and ingress. Where the design CBR is above 20, the subgrade must also meet the gradation and Atterberg limit requirements for a subbase given in Table 5-1.