I have a plotted Modified Proctor (ASTM D 1557-07) curve of fine sand (SP) with a plotted zero air voids curve that is 14 pounds above the peak and wet side of the Proctor curve. The wet side of the curve is parallel to the plotted proctor curve and the curve does not cross to the right of the proctor curve. But as I stated the ZAV curve is much higher than the plotted proctor curve. Has anyone seen such a case? Is this normal with very poorly graded clean fine sands? Or does this invalidate the proctor curve? I know there are possible variations in soils but 14 lb seems like a big gap. However, the proctor results seem reasonable for this material. The specific gravity test had been performed and is also reasonable. Any thoughts on why the ZAV is not close to the curve?
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