Cob Lime dust

[Jeanne Leimkuhler]

Does anyone have information or experience with adding Limestone dust to
concrete, mortar or cob? It is a bit like gravel and can be had for pennies
here in southern Indiana. We are thinking that it could add strength to the
concrete and some water resistance.
Adding it to cob seems more problematic. It might continue to expand and
contract if it absorbs water. Is it more like the clay or the sand?

Any other creative uses?

Thanks, Jeanne


Jeanne Leimkuhler
Senior Designer
InterArt/Sunrise Publications
Bloomington, In