17 results about "Geopolymer cement" patented technology

The invention discloses a polymer emulsion composite modified road base material and a preparation method thereof, and belongs to the technical field of traffic infrastructure engineering materials. The polymer emulsion composite modified road base material is prepared from the following raw materials: graded aggregate, super sulfate cement or geopolymer cement, water for mixing, vinyl acetate-ethylene (VAE) copolymer emulsion and a silane coupling agent. The preparation method comprises the following steps: mixing the VAE emulsion with water for mixing to obtain a polymer diluent; mixing graded aggregate with an inorganic cementing material, then adding the polymer diluent, and mixing to obtain a mixture; and then paving, compacting, forming and curing are carried out. By forming a VAE flexible network-C-S-H / ettringite hybrid network, the material has the remarkable advantages of higher mechanical strength and low cost, and can greatly improve and enhance the crack resistance and durability of the road base.

The invention discloses geopolymer cement based on coal gangue activation reaction as well as a preparation method and application thereof, and relates to the technical field of building materials. The invention relates to a coal gangue concrete, which is prepared from the following raw materials in percentage by mass: 50 to 70 percent of activated coal gangue powder, 5 to 15 percent of alkali activator, 10 to 30 percent of auxiliary cementing material and water, wherein the water accounts for 30 to 40 percent of the total mass of the activated coal gangue powder, the alkali activator and the auxiliary cementing material. Through a composite activation process of medium-temperature calcination decarburization and superfine grinding, the activity of silicon-aluminum components in the coal gangue is effectively excited, the reaction efficiency is remarkably improved, the mixing amount of the coal gangue reaches 50%-70%, the resource utilization rate of solid waste is greatly increased, and efficient activation and resource utilization of the coal gangue are achieved. By adopting the methyl sodium silicate and sodium silicate composite activator, the reaction rate and the product structure are regulated and controlled, and the workability and the setting and hardening behaviors of slurry are improved, so that the obtained geopolymer cement has relatively high early and later strength and excellent durability.

The present invention provides a method (600a) and apparatus for producing an alkaline mixture comprising sodium silicate, which mixture is suitable for use as an alkaline activator for alkaline activated and geopolymer cements, but which may also be used, for example, to mineralize captured carbon dioxide. The method comprises comminuting (301) an ore of a target metal into fines, wherein the ore comprises a siliceous mineral and at least one of iron and manganese as the target metal. The siliceous mineral may comprise the target metal itself and / or it may be silica and / or another silicate mineral present as gangue. The ore is dehydrated and hydroxylated compounds contained therein are dehydroxylated (302). The ore thus treated is then reacted (601) in an inert atmosphere with an amount of liquid sodium in excess of the stoichiometric amount thereof required for a redox reaction between the liquid sodium and an oxide of the target metal from the ore, to precipitate out from the liquid sodium a solid phase comprising both the target metal in elemental form and other insoluble products comprising sodium oxide. The redox reaction is conducted at a temperature of at least 320 °Celsius to induce a reaction between the sodium oxide and silica derived from the siliceous mineral to produce sodium silicate, but also below a temperature at which the liquid sodium can react with the oxide of the target metal to produce a ternary oxide thereof. At least some of the liquid sodium having sodium silicate dissolved therein is then separated (305) from the solid phase and is reacted (602) with at least one of oxygen and water to produce a mixture comprising sodium silicate and at least one of sodium oxide and sodium hydroxide. The corresponding apparatus comprises a comminution device (such as a rock crusher or grinder), means for dehydrating and dehydroxylating the ore (such as a dryer), a gas-tight first reaction vessel for reacting the ore thus treated with the liquid sodium, a solid-liquid sodium phase separator, and a second reaction vessel for reacting the liquid sodium having sodium silicate dissolved therein with at least one of oxygen and water. The resulting alkaline mixture is therefore produced whilst extracting the target metal in elemental form from its ore. Thus the energy consumed is split between the production of these two co-products, making the method of the invention a low-energy method of producing an alkaline activator for alkaline activated and geopolymer cements. Both reactions (601, 602) are also significantly exothermic and at least some of the thermal energy from them may be recycled. The invention does not consume any carbon and is therefore at least carbon-neutral. On the other hand, it consumes the silica content of gangue mineral species and / or of siliceous minerals of the target metal in its ore, which have previously been treated as waste products. The amount of waste material produced when extracting the target metal from its ore is thereby reduced as well.

The invention discloses geopolymer cement canvas and a preparation method thereof, and relates to the field of inorganic nonmetal composite materials and civil engineering materials, the canvas comprises an upper functional fabric, a single-component geopolymer inner core layer and a lower functional fabric which are stacked from top to bottom, and the upper functional fabric, the single-component geopolymer inner core layer and the lower functional fabric are mechanically locked into an integral flexible structure through suture lines; the single-component geopolymer inner core layer is composed of an aluminosilicate precursor, a composite solid alkali activator and a nano modifier. The preparation method comprises the steps of fabric laying, geopolymer powder spreading, compacting, fabric covering, sewing and post-processing. The functional gradient fabric and single-component geopolymer collaborative design is adopted, a traditional complex composite technology is replaced with mechanical sewing, the problems that an existing flexible cement-based material is complex in structure technology, high in cementing material carbon emission, low in solidification speed and insufficient in combination reliability are solved, and the composite material has the advantages of being fast in solidification, early in strength, low in carbon, environmentally friendly, durable, stable and the like; the method is suitable for slope protection, emergency repair and other engineering scenes.

This utility model relates to the field of water conservancy engineering technology, and provides a composite geopolymer cement prefabricated component for marine sluice gates, solving the problems of long construction processes and high costs in existing sluice gate construction. This utility model includes a base layer with an internal support frame; several embedded parts, each embedded part located at the edge of the base layer, each embedded part including an embedding section and a connecting section, one end of the embedding section extending into the base layer, and the other end extending out of the base layer and connecting to the connecting section; a support tube, with a support tube sleeved on the outside of each embedded section; and wax blocks, placed inside the support tube, with wax blocks located on both sides of each embedded section. The embedded parts are used for connecting adjacent prefabricated components, and can be used for the construction of breast walls and working bridges in sluice gate projects, eliminating the construction time of on-site formwork and pouring, shortening construction time, and reducing construction costs.

This invention relates to the field of green building materials technology, and discloses a porous lightweight geopolymer cement and its preparation method, comprising the following raw materials in parts by weight: 55.0-70.0 parts metakaolin, 30.0-45.0 parts granulated blast furnace slag powder, 70.0-90.0 parts composite alkali-activated liquid, 6.0-12.0 parts waste cooking oil, 0.6-2.0 parts photovoltaic cutting silicon waste slag, and 1.5-4.0 parts waste polyester plastic powder. This invention aligns with the concept of a circular economy, achieving complete solid waste treatment of raw materials through the synergistic utilization of industrial and domestic wastes such as metakaolin, granulated blast furnace slag powder, waste cooking oil, photovoltaic cutting silicon waste slag, and waste polyester plastic powder. This promotes the resource utilization of solid waste and reduces production costs. Simultaneously, by using a geopolymer room-temperature or self-heating curing process to replace the high-temperature calcination process of traditional Portland cement, energy consumption and CO₂ emissions are significantly reduced, resulting in a novel green cementitious material with both high performance and low-carbon environmental protection characteristics.

The application discloses a novel self-compensating geopolymer cement and a method for regulating a Mg content limit based on a BP neural network, and belongs to the field of building materials. The material is based on MATLAB to quickly and accurately determine the limit Mg content, thereby determining the optimal mixing amount of different magnesia clay, saving time cost and raw material cost. Through self-compensation, the drying shrinkage of the geopolymer cement is reduced, and the volume shrinkage and cracking problems in the hydration process of the geopolymer cement are solved. Combined with the special layered and fibrous microstructure of the clay, the brittleness of the geopolymer cement is improved. The free Mg 2+ complexing agent in the geopolymer remains, and the alkali bleeding of the geopolymer cement in the later hydration stage is reduced. It is a cementing material which can quickly determine the proportion through simulation calculation according to the material structure content and be used for self-compensating shrinkage building structure.

Alkali-activated binders (AAB) and associated compositions are an alternative to portland cement (PC), offering a potential binding system for a low-carbon materials. Almond ash AABs have notably lower emissions of GHG and several key air pollutants when compared to conventional synthetic chemical-based AAB mortars. The results demonstrate that AAB mortars with 50% and 100% almond ash replacement of synthetic chemical-alkali resources levels result in an improved combination of GHG emissions to compressive strength ratio relative to conventional portland cement mortars. When considering the scale of PC consumption, results indicate that 0.08 to 0.47 million metric tons of GHG emissions could be avoided by substituting chemical-based AAB with almond shell ash binders in the production of concrete in California.

The invention comprises a cementitious material comprising a natural pozzolan selected from hyaloclastite, sideromelane or tachylite, wherein the natural pozzolan has a volume-based mean particle size of less than or equal to 40 μm. The cementitious material also comprising an aqueous alkaline activating solution suitable for forming a geopolymer. A method making a cementitious material is also disclosed.

A composition and method for well cementing are provided. The composition comprises a geopolymer slurry that is prepared by mixing a particulate material derived from red mud, an alkaline activator, an aqueous solvent, and a SiCh source material added to produce a geopolymer slurry with a Si / Al ratio of from 2 to 6. The method for well cementing includes pumping a geopolymer slurry into a location to be cemented and Harding the geopolymer slurry to form a cement.

The present application relates to a kind of geopolymer cement grout, including glass water, kaolin, expanding agent, quicklime powder, re-dispersible latex powder, standard sand;Each component is proportioned as follows by weight fraction ratio: 100 weight parts of water glass, 40~52 weight parts of kaolin, 4~5 weight parts of expanding agent, 2~4 weight parts of quicklime powder, 0.5~1.5 weight parts of re-dispersible latex powder, 35~40 weight parts of standard sand.The geopolymer cement grout is applied to sleeve grouting, caulking and the like.The high-strength non-shrinkage geopolymer cement grout provided by the present application is simple to deploy, low in cost, low in production energy consumption, small in carbon emissions, has good flow performance, mechanical properties and micro-expansion performance, and can meet the various requirements of industry specifications for grout.

A method of fabricating a concrete slab on ground system includes depositing wet geopolymer cement concrete on a ground substrate to generate a first slab. Wet Portland cement concrete is then deposited on the first slab to generate a second slab.

A composition and method for well cementing are provided. The composition comprises a geopolymer slurry that is prepared by mixing a particulate material comprising ground red mud, an alkaline activator, an aqueous solvent, and a SiO2 source material added to produce a geopolymer slurry with a Si / Al ratio of from 2 to 6. The method for well cementing includes pumping a geopolymer slurry into a location to be cemented and hardening the geopolymer slurry to form a cement.

The invention relates to the field of mechanical claw feeding, in particular to a green geopolymer cement production and processing feeding device and method.The green geopolymer cement production and processing feeding device comprises a driving mechanism used for feeding control and opening and closing treatment of cement raw materials, and a sealing mechanism is arranged at the bottom of the driving mechanism; the sealing mechanism is used for performing reinforced sealing treatment on the bottom of the feeding device; the feeding device comprises a sealing mechanism, a first feeding mechanism and a second feeding mechanism, the first feeding mechanism and the second feeding mechanism are used for feeding liquid raw materials or solid-liquid mixed materials of cement, and the first feeding mechanism and the second feeding mechanism are symmetrically arranged on the two sides of the sealing mechanism. The device is provided with a second feeding mechanism matched with a liquid sodium silicate solution and a first feeding mechanism matched with solid-liquid mixed slag slurry, and rapid switching of the two mechanisms can be achieved by controlling a hydraulic rod to ascend and descend through a driving mechanism.

A composition and method for well cementing are provided. The composition comprises a geopolymer slurry that is prepared by mixing a particulate material comprising ground red mud, an alkaline activator, an aqueous solvent, and a SiO2 source material added to produce a geopolymer slurry with a Si / Al ratio of from 2 to 6. The method for well cementing includes pumping a geopolymer slurry into a location to be cemented and hardening the geopolymer slurry to form a cement.

The invention relates to the technical field of building materials, in particular to cementitious cooling mortar for a building exterior wall and a preparation method of the cementitious cooling mortar, the cementitious cooling mortar comprises geopolymer cement, modified linen fibers, a water-absorbing polymer and water, the geopolymer cement comprises solid powder, toughening fibers and an alkali activator, the solid powder contains Ca < 2 + >, and the modified linen fibers are added into the alkali activator. The modified linen fiber is obtained by loading calcium sulphoaluminate and water glass on linen fiber and packaging, and the mass percent of the modified linen fiber in the geopolymer cement is 0.3%-0.7%, the mass percent of the water-absorbing polymer in the geopolymer cement is 0.3%-1.8%, and the mass percent of the water in the geopolymer cement is 5%-15%. According to laboratory determination, the cement-based cooling mortar for the building outer wall, provided by the invention, realizes surface cooling through evaporation and heat dissipation, and meanwhile, the cement-based cooling mortar plays a self-repairing function, prevents extension and recovers strength through modified linen fiber toughening and crack resistance when cracks appear, so that the durability is remarkably improved.