Abstract: This invention provides a method of preventing loss of muddy water used in boring a hole in the ground by a drill bit or the like with the muddy water introduced into the hole to stabilize hole walls and to remove slime resulting from the boring. When the muddy water is getting lost to the soil, a chemical liquid comprising an isocyanate compound or including an isocyanate compound as a main component is introduced along with a fibrous filler to a depth of the hole. The position from which the muddy water is leaking is filled with the fibrous filler and is sealed with a cured product of the chemical liquid.

Abstract: A method of solidifying noxious wastes contaminated with toxic substances possibly affecting an environmental ecological system, using a cement-type solidifying agent and lipid added and admixed into the noxious wastes, to cause solidification thereof and at the same time fixation of the toxic contaminants, both organic and inorganic, as contained therein.

Abstract: Solidification or consolidation, for fixation of various kinds of waste matter, soil etc. containing toxic contaminants affecting ecological system of the environment, by use of composition made up of hydraulic cement and particular additive. The additive essentially contains at least one sulfate, such as aluminum sulfate, alum or iron sulfate, and at least one alkaline metal salt, such as carbonate, bicarbonate or silicate.