Abstract: The present invention is directed to sealable rock bolts that prevent water leakage through the bolt, a kit containing portions of such bolts prior to assembly, installation, and use, and a method of using such sealable rock bolts. Such rock bolts are fastened in place in a roof, wall, or bottom of an underground region via pressure fitting or the like. The rock bolt contains a sealing unit that contains a liquid water activated, expandable hydrophobic pre-polymeric resin. The sealing unit has side, top, and bottom portions that are degradable by water to permit the resin to expand upon contact with water and to seal the bolt to prevent water passage through the bolt.

Abstract: The present invention is directed to an underground opening that is filled and sealed with grout comprising an aggregate coated with water-activated, expanded hydrophobic polymeric resin.

Abstract: The present invention is directed to sealable rock bolts that prevent water leakage through the bolt, a kit containing portions of such bolts prior to assembly, installation, and use, and a method of using such sealable rock bolts. Such rock bolts are fastened in place in a roof, wall, or bottom of an underground region via pressure fitting or the like. The rock bolt contains a sealing unit that contains a liquid water activated, expandable hydrophobic pre-polymeric resin. The sealing unit has side, top, and bottom portions that are degradable by water to permit the resin to expand upon contact with water and to seal the bolt to prevent water passage through the bolt.

Abstract: The present invention is directed to a method for filling and sealing underground voids and the like with use of a grout comprising aggregate coated with a water-activated expanded hydrophobic polymeric resin, such as polyurethane.

Abstract: The present invention is directed to a method for filling and sealing underground voids and the like with use of a grout comprising aggregate coated with a water-activated expanded hydrophobic polymeric resin, such as polyurethane.

Abstract: The present invention is directed to a method for filling and sealing underground voids and the like with use of a grout comprising aggregate coated with a water-activated expanded hydrophobic polymeric resin, such as polyurethane.

Abstract: A dispensing device and method, especially adapted for use in sealing high pressure fluid leaks, is disclosed. Such use requires high pressure dispensing of sealant. Such sealants are formed by an exothermic reaction of at least two liquid substances that generates high pressures within the dispensing device. Such pressures could potentially harm the feeding system of the device due to pressure backflow. This problem is solved by providing a check valve in the mixing and reaction chamber of the device to protect the feeding system. A static mixer is disposed within the chamber to enhance mixing and reaction of the substances.