A precast refractory block for a coke oven having high hot strength and stable under-load expansion/shrinkage behavior at high temperatures. Specifically, a silica-based precast refractory block contains a P.sub.2O.sub.5 component in an amount of 0.3 to 2.0 mass %.

The present invention relates to a dry refractory particulate composition comprising a zeolithic microstructure, to a green body and to a refractory lining formed therefrom, and to uses thereof.

The present disclosure relates to an anti-breaking element comprising a geopolymer, a process for preparing an anti-breaking element, the process comprising: a) providing the skeleton of an anti-breaking element; b) preparing a geopolymer formulation; c) casting the geopolymer formulation of step b) into the skeleton of the anti-breaking element of step a); and d) optionally, removing the skeleton. The present disclosure further relates to the use of a geopolymer as part of an anti-breaking element.

Various embodiments include cementitious compositions with low levels of embodied greenhouse gas emissions, in particular carbon dioxide, as a result of its production and/or use compared to conventional cementitious materials, such as portland cement. Various embodiments include any cementitious material or materials with low embodied carbon, as well as any material produced using this cement.

A method of manufacturing a catalytic fuel brick includes providing a metal-based cementing agent including magnetite, an aqueous phosphoric acid cement reacting agent, and an aggregate including at least one of coal, grain biomass and wood biomass. The catalytic fuel brick further includes a setting agent of at least one of iron oxide and iron. The constituent components of the catalytic fuel brick are mixed together to form a liquid concrete mixture, which is placed in a form and allowed to set up and cure into the catalytic fuel brick. The method can optionally include the additional step of placing the concrete product into an oven at a temperature of between 170 and 190 C.

The disclosure provides an ultralow-carbon clinker-free cement, prepared from the following raw materials: granulated blast-furnace slag, gypsum and calcium oxide-based materials. The granulated blast-furnace slag accounts for 65%-95% of the total weight of the raw materials, the gypsum accounts for 4.5%-34.5% of the total weight of the raw materials, and the balance is the calcium oxide-based material. A weight percentage of calcium oxide and/or calcium hydroxide in the total weight of the raw materials is controlled to be 0.05%-0.75%. The disclosure further provides a method for preparing the ultralow-carbon clinker-free cement and application of the ultralow-carbon clinker-free cement in the preparation of concrete, mortar or cement products. The ultralow-carbon clinker-free cement of the disclosure has the advantages of high early strength, ultrahigh long-term strength, low shrinkage, carbonation resistance, low carbon emissions, etc.

The invention concerns a compressed concrete block comprising a raw clay matrix, a calcined metal oxide composition and aggregates, said compressed concrete block having a basis weight less than or equal to 600 kg/m.sup.2.

The invention further proposes a preparation method (100) for a compressed concrete block having a basis weight less than or equal to 600 kg/m.sup.2, said method comprising the following steps: mixing (110) a raw clay matrix, a calcined metal oxide composition, aggregates and water; placing (120) the resulting mixture in molds; applying (140) pressure to one surface of the molded mixture, preferably the top surface; removing (160) the compressed concrete blocks from the molds, so as to obtain a compressed concrete block with a basis weight less than or equal to 600 kg/m.sup.2.

A density controlled cold fusion concrete cementitious spray applied fireproofing material including a mixture of water, one or more of silicon dioxide, expanded glass, vermiculite, bottom ash, perlite, expanded shale, expanded polystyrene, and sulfonated formaldehyde, or other lightweight aggregates of various diameter sizes ranging from about 0.025 mm to about 12.5 mm in diameter; anhydrous or hydrous sodium or potassium metasilicate; waste from steel production consisting of Granulated Ground Blast Furnace Slag (GGBFS); high calcium or low calcium waste from coal combustion (fly ash or bottom ash); sodium tetraborate, sodium citrate dihydrate, citric acid, or boric acid; and an alkali-resistant micro-fiber.

The present application concerns the use of a molecule producing an aqueous solution exhibiting a dispersive portion of more than 25%, for improving workability retention in a hydraulic composition based on a hydraulic binder composition including aluminosilicates and a maximum of 10% by weight of clinker preferably from 0 to 10% by weight of clinker.

The present invention relates to advanced cement free composition for concrete and panels useful in construction industry and the method of preparation thereof. Particularly the present invention relates to advanced cement free composition constituting Sea sand, Fly Ash, Seawater, NaOH and Na.sub.2SiO.sub.3 (sodium meta silicate). More particularly the present invention relates to advanced cement free composition for concrete and panels with comprehensive strength of 15 to 30 MPa and flexural strength of 1.5-3.0 MPa.