A method for preparing a high-performance compressed desert sand concrete is provided. The method includes: mixing a cement, a coarse aggregate, a fine aggregate, and water, and subjecting a mixture to compression casting, and curing in sequence to obtain the high-performance compressed desert sand concrete; where the compression casting is conducted at a pressure of not less than 2 MPa for not less than 2 min.

The present invention relates to process for producing a hot blended material of amorphous silicon dioxidecrystalline silicon dioxide (Hot Blending silicaPheniSilic) from materials containing silicon dioxide such as sand, cristobalite, crushed glass, waste rock powder/burrs from process of producing artificial stone, waste products and by-products from the exploitation and processing of natural quartz stone. The present invention also relates to artificial stone product produced by using base resins such as unsaturated polyester, epoxy, acrylic or combination thereof and reinforcement is the hot blended material of amorphous silicon dioxidecrystalline silicon dioxide wherein the artificial stone has a flexural strength40N/mm.sup.2, a water absorption0.05%, an impact resistance3J, as well as process for producing this artificial stone.

The present invention relates to a brick and a manufacturing method therefor, and provides a brick which has at least improved strength by comprising: as a brick material, soil (e.g., red clay, clay, kaolin, and/or dredged soil), sludge or the like used as a base material; and a solidifying agent for solidifying the base material, and a manufacturing method therefor. According to the present invention, particles of the base material constituting the brick are firmly gathered together, resulting in at least improved strength.

In one embodiment, a building material derived from a geopolymer formulation comprises sand, ground granulated blast furnace slag (GGBFS), fly ash, sodium tetraborate, boric acid, zeolite, sodium caseinate, and SC-9. Optionally, the formulation also comprises additional constituents like sodium metasilicate, sodium hydroxide, magnesium oxide, hemp, basalt fibers, aggregates, and fillers. The building materials have high compressive strength, flexural strength, tensile strength, impact resistance, and thermal resistance.

Disclosed herein is a concrete article comprising: a plurality of pores having an average pore diameter of less than 1 micron as measured using mercury intrusion porosimetry (MIP) with a pressure of less than 440 MPa and overall porosity of less than 15% measured using helium porosimetry, wherein the concrete article exhibits a gas permeability of 10.sup.17 to 10.sup.22 m2 as measured under steady-state conditions (with an upstream chamber pressure of 0.31 MPa and a downstream chamber pressure of less than 5 Pa) and is configured to substantially prevent a gas leak. Also disclosed are methods of making the same articles.