Adding Cremains?

Hi Mike. I'd like to make a smallish memorial stone for my mom incorporating her ashes. I understand cremains are alkaline, however. (Enough so to harm any plants they may be buried under, hence my desire for a "stone" instead.) How, if at all, should I account for this extra alkalinity in my concrete mix?

mikeasaurus1 month ago

I don't believe adding more of a alkaline substance would have much impact on the properties of the concrete. I would use the ashes sparingly as to not dry out the mix too much. You could always perform a test casting using wood ash to get the ratio right if you have doubts.

I think that's a wonderful project idea. I'd love to see a picture when you're finished.