Abstract: To provide a neutral solidifying agent with excellent water resistance and strength and without adverse environmental effects as a soil-solidifying agent. A soil-solidifying agent including as an active ingredient, neutral anhydrous magnesium oxysulfate prepared by adding 1 mole of concentrated sulfuric acid to 3 to 5 moles of magnesium oxide while stirring for a reaction at a reaction temperature of 105° C. or higher.

Abstract: To provide a mulching technique which is excellent in weatherability and waterproofness, exerts a high anti-erosion effect on inclined lands, is efficacious in inhibiting the growth of weeds in agricultural and non-agricultural lands and preventing outflow of soil and formation of muddy water accompanying rainfall and makes it possible to control soil temperature. A weed-controlling material includes as the main component a slurry comprising from 3 to 30% by weight of magnesia cement having a chemical composition comprising lightly baked magnesia and being non-stoichiometric and from 97 to 30% by weight of water.

Abstract: A novel cement is alkalescent, capable of solidifying a wide range of soil and applicable to biological environment. The cement composition contains 100 parts by weight of magnesium oxide, 5 to 25% by weight of at least one of silicic acid, alumina and iron oxide, 3 to 35 parts by weight of a phosphate, 2 to 30 parts by weight of gypsum and 0.005 to 7 parts by weight of a hydroxycarboxylic acid or a ketocarboxylic acid.

Abstract: To provide a novel cement which is alkalescent, capable of solidifying a wide range of soil and applicable to biological environment. That is, a cement composition comprising 100 parts by weight of magnesium oxide comprising 5 to 25% by weight of at least any one of silicic acid, alumina and iron oxide, 3 to 35 parts by weight of a phosphate, 2 to 30 parts by weight of gypsum and 0.005 to 7 parts by weight of an oxycarboxylic acid or a ketocarboxylic acid.

Abstract: An inorganic hardening composition contains 100 parts by weight of an alkaline earth metal oxide, and 5 to 80 parts by weight of an organic carbonic acid compound.

Abstract: The present invention provides a thermoplastic cement composition, characterized in that the composition can be easily processed thermoplastically during molding and that when the cement component constituting the composition is hardened by the absorption of water, the composition loses its thermoplasticity to give a product having excellent heat resistance and other properties.The thermoplastic cement composition comprises 100 parts by weight of a thermoplastic, 50 to 600 parts by weight of a hydraulic cement and/or an air-hardening cement and 0.1 to 20 parts by weight of a hydrophilic substance.