Attached is a spreadsheet to classify the soil according to USCS and the granulometric curve is plotted by sieving.

Please upload any improvements done to this file and post if any mistakes are found or if you have any suggestions.

This is the original code.
USCS1.sm (101 KiB) downloaded 135 time(s).

This is the original code with another particle-size distribution
USCS.sm (103 KiB) downloaded 85 time(s).

Below in another post it is updated with a better presentation of the granulometric curve.

Fit & explorer ... Jean

USCS fit Granulometry.sm (21 KiB) downloaded 96 time(s).

Wrote

Fit & explorer ... Jean

USCS fit Granulometry.sm (21 KiB) downloaded 96 time(s).

Thank you so much,

I added the logistic sigmoid function you made to the initial code and it compare with and without the fit. In addition to the initial curve, I graphed it using the Zed Graph, where it can be better appreciated using a semilogx graph

USCS-fit-Granulometry.sm (175 KiB) downloaded 73 time(s).

Wrote

Thank you so much,

Thanks as well, very educative.
A large suite of math codes added
Cheers ... Jean.

Project USCS fit Granulometry.sm (90 KiB) downloaded 86 time(s).