Why do we should draw the zero air voids with the compaction curve ?

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Amiya Prakash Das

ZAVL corresponds to degree of saturation = 1, and no matter how much energy you give there is no state possible beyond ZAVL. In other words, it is not possible to compact the soil beyond the ZAVL.

Mehran Karimpour-Fard

Amiya is right. A compaction curve never could intersect with ZAVL. If it does, it means there is something wrong in our compaction test.

Abdul Hakam

The benefit of drawing z.a.v. curve is to control the compaction test results. The result curve(s) can not cross the z.a.v. line.

Omar Hamdi Jasim

Thank you for your answers

Mustafa Aytekin

All of the contributions are good. What about degree of saturation lines? For example what is the use of S=90%, 80%...etc. lines?

Thank you guys for your answers