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gentlemen, thank you for your quick responses, I was able to find the flexible pavement manual and covnert the CBR. much appreciated.

to follow escrowe; the stabilization of the native material under the base course can also be acheived (and frequently is) with a combination of clay, rock and or shell fragments. watch out for too much clay stabilization, this will significantly reduce bearing capactiy in saturated (wet-season)...

again i would say instead of labratory moulded samples, I would try coring in-place material. Usually a 4-inch concrete coring bit will work, then trim the ends and sulfur cap, see what you get for compressive strength. I would recommend taking at least two or three cores for comparison purposes...

looking for the above, I have found a couple of nomographs that might allow me to intrpolate the answer, but I am not familiar with their use. I was hoping for a table from a DOT design manual, however my home state doesnt recognize CBR.

asphalt roadway design reveolves around structural number; once you have the design structural number, any combination of asphalt, base, and stabilized subgrade (each having a unique Sn coefficient) thicknesses can be used to get that Sn, subject to the limits of material availability and cost.

defg, I agree with everything posted so far, having done several roadway rehab programs where FDR (full depth reclamation) cemented base has been used. generally more cement menas more hydration/shrinkage cracking, so we try to use minimum % that still achieves required f'c value for the base. I...