What is the stiffness/elasticity modulus of highly weathered sandstones?

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Dong Wang

Christian Ungewitter, according to the results of rock mechanics tests of some water conservancy projects and other projects in China, the elastic modulus of strongly weathered sandstone is about 1.3 GPa. I hope this can help you.

Qihang Li

The elastic modulus of highly weathered sandstone ranges from 0.95 to 19.2.

Werner Bilfinger

Weathered sandstone may have "rock like behavior" or "soil like behavior", varying from compact sand to weakly bonded rock.

Some data may be found in the document below. It is in portuguese, but you will find data that may be interesting searching for "arenito" = sandstone.

https://www.teses.usp.br/teses/disponiveis/44/44141/tde-21012019-142437/publico/PF_2018_volfinal.pdf

Good Luck!