A system and method for mixing and dispensing grout to be used for anchoring of bolts or bars in the floors, walls or ceilings of structures or excavations is disclosed. The system comprises a caulking tube in which grout components, a catalyst and a mastic, have been placed inside a plastic bag along with an assembly for mixing the grout and a mixing rod. When the grout is ready to be used the dispensing tip of the caulking tube is cut off and the mixing rod is inserted through the opening in the tip and into a slot cut in a wall of the mixing assembly. The other end of the mixing rod is formed so that it may be inserted into the chuck of a drill. When the drill is operated, the mixer assembly, upon which mixing blades have been installed, rotates and as the drill is pressed forward the mixer assembly is moved longitudinally through the tube mixing the components of the grout. The caulking tube is covered with a shrink wrap to prevent the movable end (opposite the dispensing tip) of the caulking tube from being ejected during the mixing operation. After mixing is complete, the mixing rod is removed and the caulking tube is placed in a caulking gun. When the trigger of the gun is pulled, the plunger of the gun presses against the movable end and grout is ejected from the dispensing tip.