We used Euclid Epoxy to repair a floating 4 lane highway. We injected the cracks from the inside and had a diver outside with Sika hydraulic cement to stop any bleed through.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).