I used Mold Star 30 silicone rubber for the molds and Quikrete Countertop Mix in white for the concrete. For complete instructions go to my website. HomeMade-Modern.com ...

Scientists create quality concrete with 100% tire-rubber aggregate By Ben Coxworth. August 11, 2022 Facebook; ... then placed that concrete in special steel molds as it was setting.

After drying, the resulting concrete exhibited a much stronger bond between the hardened cement and the rubber particles, giving it a 97% increase in compressive strength, and a 20% boost in ...

Frekote EFR from Henkel Loctite Corp. is a semipermanent polymeric release agent for flange sealing on composite molds. Formulated to seal porous flange surfaces, the fast curing, easy-to-apply ...

For 6 by 12 inch molds use a 5/8 inch diameter tamping rod and a 3/8 inch diameter rod for 4 by 8 inch molds. 4. Lightly tap the outside of the mold 10 to 15 times with a rubber mallet to close ...