Hypertufa Recipe Question

If I were to add or replace one of the ingredients in the hypertufa recipe with cedar shavings... would it work? And which ingredient would I replace? Or would I just add it to the recipe?

Just wondering, cause hubby has a box full of fine cedar shavings I wouldn't let him throw away. I was just thinking it might be interesting to see it used in some pottery projects, but I don't want to put that much work into something to have it fail.