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 (102kb) downloaded 14 time(s).

This is the original code with another particle-size distribution
USCS.sm (104kb) downloaded 8 time(s).

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

Edited by user 07 September 2023 08:08:14(UTC)  | Reason: Not specified

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 (176kb) downloaded 12 time(s).

Edited by user 07 September 2023 07:50:04(UTC)  | Reason: Not specified