The present invention relates to a new method for stabilising marine clays such as sediments, marine sediments, or dredging muds by using mussel shell powder and cement, their use and a respective product. A properly treated milled shell powder is mixed with a cement in order to obtain a solid composition of powders, which is subsequently mixed with the marine clay to obtain a product that can be used in the building industry.

This invention relates to a solidifying agent for solidifying radioactive waste, and more particularly to a solidifying-agent composition for solidifying radioactive waste, including alumina cement and a gypsum powder. The solidifying-agent composition including alumina cement and a gypsum powder is capable of effectively minimizing an increase in the volume of a solidified radioactive waste product to a level satisfying physical and chemical safety regulations upon the solidification of radioactive waste.

A method and composition for stabilizing drill cuttings commences by providing precipitated calcium carbonate (PCC). The PCC is dried to a moisture level of about 10% or less. Drying by heat not to exceed 400 F. is preferred to prevent changes in the PCC. The dried PCC is blended with kiln dust to compose a generally uniform admixture. In the admixture, the kiln dust is not to exceed 40%. The admixture is introduced to the drill cuttings to initiate a nucleation reaction within the commixture of drill cuttings and the admixture.

The present invention relates to a binder composition comprising (i) a phospho-magnesium cement; (ii) a boron source; (iii) a lithium salt; and (iv) water and to its preparation method. The present invention also relates to the use of such a binder for confining wastes and notably nuclear wastes containing aluminum metal.

A process for treating polluted soils, in particular soils with a leachable fraction greater than 0.4%, wherein the leachable fraction contains predominantly anions, in particular sulfate ions, and/or heavy metals, includes mixing the soil with a sulfoaluminate-clinker-based hydraulic binder, in soil/binder weight proportions of between 1 and 40 parts of binder per 100 parts of soil, the sulfoaluminate clinker containing more than 50% by weight of ye'elimite C.sub.4A.sub.3S phase, less than 15% by weight of belite C2S phase, and from 1% to 5% by weight of free lime CaO. The process is used for stabilizing soils in situ or before dumping, soils polluted in particular with sulfate anions and/or heavy metal cations.

The present invention deals with development of a novel process for manufacturing moisture resistant glossy finish hybrid green polymeric composites with variable density in range of 0.2-1.68 g/cc, low water/moisture absorption in the range of 0.1-1.3%, tensile strength and tensile modulus in range of 6.5-105 MPa and 250-6850 MPa, respectively and to the best of our knowledge the fabricated hybrid green composites has not yet developed universally using different types of industrial wastes particulates. Moreover, hybrid composites developed using industrial wastes, natural fibres and epoxy/polyester/polyurethane polymers is a unique materials and have multifunctional applications in wider spectrum as an alternative to wood, synthetic wood, wood plastic composites, screen printing sheet, plastic, fibre and glass reinforced polymer products, including tin sheet.

An agglomerate is provided that can include an aluminosilicate (ash) base material and one or more of a binding agent or leach reduction agent. Each of the agglomerate and binding agent can include no more than about 25 wt. % cement.

Systems and methods of the present invention include a method for the treatment of drilling wastes and coal combustion residues, comprising combining at least a first drilling waste with coal combustion residues to form a paste, combining at least a second drilling waste with coal combustion residues to form a compactable fill, and placing the paste and the compactable fill in a landfill. Other embodiments include a method of treating drilling wastes and coal combustion residues, comprising combining at least one drilling waste with a coal combustion residue to form a paste. Further embodiments include containing the paste within at least one geotextile container. Still further embodiments include placing the geotextile container in a landfill.

A treatment method for coal fly ash, and in particular sodic fly ash, comprises 1) contacting the coal fly ash with anhydrite, and 2) contacting the coal fly ash in the presence of water with at least one additive. The material obtained from the contacting steps (1) and (2) may be dried. The steps (1) and (2) may be carried simultaneously or sequentially. The additive may comprise at least one component selected from the group consisting of strontium-containing compounds, barium-containing compounds, dolomite, a dolomite derivative such as calcined or hydrated dolomite, water-soluble sources of silicate such as sodium or potassium silicate, iron-containing compounds, and any combinations thereof. A particularly preferred additive comprises sodium silicate. The method may be effective in reducing the sodium content in the fly ash (Na.sub.2O), reducing the alkalinity of the fly ash, and/or stabilizing at least one heavy metal such as selenium and/or arsenic to reduce their leachability.

Base grains intended to be assembled together to form granules for a composition of construction materials useful in the field of building, public works and civil engineering, characterised in that each base grain consists of a core formed by an agglomerate of fragments of compressed waste and associated with each other by a micro-concrete with a carbonated hydraulic binder which has undergone hydraulic setting, the core being enclosed in a shell formed by a reactive powder micro-concrete (RPMC) which has undergone hydraulic setting.