Disclosed is a compound for capturing carbon dioxide and improving the arability of soil. The compound includes a quantity of calcium hydroxide and a quantity of basalt. The calcium hydroxide improves the arability of soil by raising soil alkalinity and acting as a pH buffer to prevent it from becoming too acidic. The quantity of basalt sequesters carbon dioxide by providing reactive minerals capable of facilitating carbon mineralization. Also disclosed are methods of making and experimental results demonstrating the compound's efficacy.

Disclosed is a compound for capturing carbon dioxide and improving the arability of soil. The compound includes a quantity of calcium hydroxide and a quantity of basalt. The calcium hydroxide improves the arability of soil by raising soil alkalinity and acting as a pH buffer to prevent it from becoming too acidic. The quantity of basalt sequesters carbon dioxide by providing reactive minerals capable of facilitating carbon mineralization. Also disclosed are methods of making and experimental results demonstrating the compound's efficacy.

The present invention provides a construction method for ecologically protecting an expansive soil slope by combining phosphogypsum with microbial mineralization. The method includes: (1) placing Bacillus pasteurii in a culture medium to prepare a microbial solution, and mixing urea, calcium chloride and water to prepare a cementing solution; (2) preparing a mixture with phosphogypsum fly ash and soil; mixing the mixture, the microbial solution and water well, and adding the cementing solution and water to prepare an improving mixture slurry; and (3) spraying the improving mixture slurry to a face of the slope by wet spraying, and covering with a non-woven fabric by tying and fixing.

The present invention provides a construction method for ecologically protecting an expansive soil slope by combining phosphogypsum with microbial mineralization. The method includes: (1) placing Bacillus pasteurii in a culture medium to prepare a microbial solution, and mixing urea, calcium chloride and water to prepare a cementing solution; (2) preparing a mixture with phosphogypsum fly ash and soil; mixing the mixture, the microbial solution and water well, and adding the cementing solution and water to prepare an improving mixture slurry; and (3) spraying the improving mixture slurry to a face of the slope by wet spraying, and covering with a non-woven fabric by tying and fixing.

Problem: To provide a technique suitable for the circular economy that allows reduction of the environmental load.

Solution: A soil paving material for paving soil on topsoil includes a stone dust 110, a baked rice bran 120, and a solidifying material 130. The stone dust 110 is produced when a stone material is processed. The baked rice bran 120 is produced by baking rice bran into a carbonized state. The solidifying material 130 used for the soil paving material includes at least one of a calcined plaster and a hydrated lime.

Problem: To provide a technique suitable for the circular economy that allows reduction of the environmental load.

Solution: A soil paving material for paving soil on topsoil includes a stone dust 110, a baked rice bran 120, and a solidifying material 130. The stone dust 110 is produced when a stone material is processed. The baked rice bran 120 is produced by baking rice bran into a carbonized state. The solidifying material 130 used for the soil paving material includes at least one of a calcined plaster and a hydrated lime.

A method of making a non-dispersible granular substrate includes forming a batch mixture comprised of one or more mineral-filler components, one or more pozzolan components, one or more hydrated lime components, and water, and co-pelletizing the batch mixture to form a plurality of granules. The resulting granules are non-dispersible in water, have a bulk density of 25 lb/ft.sup.3 or more and 75 lb/ft.sup.3 or less, and have a moisture content of from 0% to 16%.

A method of making a non-dispersible granular substrate includes forming a batch mixture comprised of one or more mineral-filler components, one or more pozzolan components, one or more hydrated lime components, and water, and co-pelletizing the batch mixture to form a plurality of granules. The resulting granules are non-dispersible in water, have a bulk density of 25 lb/ft.sup.3 or more and 75 lb/ft.sup.3 or less, and have a moisture content of from 0% to 16%.

Soil improving compositions and methods of using the compositions for improving soil properties are described.

Soil improving compositions and methods of using the compositions for improving soil properties are described.