Epoxy granite is your best bet, but what epoxy granite is the best? That’s the question [Adam Bender] ... Samples using rock didn’t turn out that great and still had trapped air.

After the epoxy samples were cracked, current was run through the shape-memory alloy wires, causing them to heat up, change crystal structure, and induce sufficient stresses in the epoxy to close ...

Cured neat epoxy samples also were studied after heat aging in an oven for 200 hours at 149°C (300°F) and 400 hours at 177°C (350°F) to determine the effect of various nano-tougheners, liquid rubbers, ...