(Patent Number：US 7163581 B2)

A method for making a regenerated soil material for production of a structural unit includes the steps of :(a)obtaining a raw soil material containing aluminum and silicon from a natural source; (b)adding an active mineral containing aluminum and silicon to the raw soil material; (c)cleaving the raw soil material and the active mineral in a base so as to dissociate aluminum monomer and silicon monomer out of the mixture of the raw soil material and the active mineral; and (d)polymerizing the aluminum monomer and the silicon monomer so as to form silicon-oxy tetrahedron and aluminum-oxy tetrahedron in the mixture.

This patent attempts to develop a recyclable, high strength, ecological soil material that does not consist of cement and is unpolluted, named High Strength Ecological Soil Material (HSESM). The production of high strength ecological soil material involves calcinating soil minerals to very high temperatures, adding active minerals, using concentrated alkali to disintegrate silicate and aluminate monomers, and, using Na2SiO4 to re-polymerize the soil material to a polymer that resembles the structure of zeolite. The results of the study shows that the 28 day compressive strength of high strength ecological soil material exceeds 20MPa, with flexural strength in the order of 10% of the compressive strength.

The permeability of this material is categorized as moderate level according to ASTM C1202-97. Discarded HSESM can be reverted back to powder using jaw crushers and mechanical grinding facilities.

Through the four steps described above, the recycled HSESM can be reused again.

Contact us at s83808@yahoo.com.tw for more information.