High impact joint and crack fillers
A joint and crack filler composition may include a rubber aggregate and a binder made of a resin and a hardener. The rubber aggregate may be made from recycled tire rubber and may include a tri-blend of large shreds, small shreds, and fine pieces. The resin may be an epoxy, such as a semi-rigid liquid epoxy or a semi-rigid thixotropic epoxy.
1. A joint and crack filler composition comprising:
a rubber aggregate comprising a tri-blend aggregate comprising a mixture of large shreds of rubber, small shreds of rubber, and fine pieces of rubber; and
a binder comprising a resin and a hardener,
wherein:
the large shreds of rubber have a length of from about ½ to about ¾ inch and a width of about 1/16 inch;
the small shreds of rubber have a length of from about ⅛ to about ¼ inch and a width of about 1/16 inch; and
the fine pieces have a US sieve size of from about 60 to 120.
2. The joint and crack filler composition of claim 1 , wherein the rubber aggregate comprises:
about 45% large shreds;
about 35% small shreds; and
about 20% fine pieces.
3. The joint and crack filler composition of claim 1 , wherein the rubber aggregate comprises recycled tire rubber.
4. The joint and crack filler composition of claim 1 , wherein a volume ratio of resin to hardener is about 2 to 1.
5. The joint and crack filler composition of claim 1 , wherein the resin is an epoxy selected from the group consisting of a semi-rigid liquid epoxy and a semi-rigid thixotropic epoxy.
6. The joint and crack filler composition of claim 1 , wherein the hardener comprises a mixture of polyoxypropylenediamine, nonylphenol, methylpent amethylenediamine, benzyl alcohol, and epoxy polyamine.