18results about How to "Improve volume stability" patented technology

The application belongs to the technical field of refractory materials, and relates to a multi-metal composite magnesium-alumina spinel-containing refractory material and a preparation method thereof. The material of the magnesium-alumina spinel-containing refractory material is one of SiC-MgAl2O4, Al2O3-MgAl2O4 and MgO-MgAl2O4; the main body of components of the magnesium-alumina spinel-containing refractory material is granular SiC, Al2O3 and MgO as aggregate and a mixture of fine powder and micro powder composed of MgAl2O4 as matrix, and the components contain metal Al and Al-Mg alloy; the magnesium-alumina spinel-containing refractory material is prepared through hot air drying at 150-200 DEG C for 8-24 hours, and high-temperature sintering is not needed; the magnesium-alumina spinel-containing refractory material is a composite refractory material with alpha-SiC or corundum or periclase as main crystal phase and magnesium-alumina spinel as secondary crystal phase. The application realizes that the formed green body only needs to be treated at low temperature not higher than 200 DEG C, and can meet good mechanical properties, structural stability and corrosion resistance in a use temperature range of 25-1600 DEG C, and the built-in hot work thermal reserve can realize high mechanical strength and volume stability from normal temperature to the highest use environment through the waste heat in the oven heating process.

This invention belongs to the field of cement materials technology, specifically disclosing a fast-setting silica-alumina phosphate cement and its preparation method. The cement includes main components and functional regulating components. The main components are 50%-70% silica-alumina raw materials, 20%-30% heterocyclic organophosphate activating raw materials, and 10%-20% modified silicate calcium raw materials. The functional regulating components include heterocyclic solvents, metal chelate polymerization accelerators, and polyhydroxy coordination early-strength agents. The functional regulating components are added additionally based on the total mass of the silica-alumina raw materials and modified silicate calcium raw materials as 100%. This invention achieves rapid setting and hardening at room temperature through the synergistic effect of the heterocyclic organophosphate activator and the functional regulating components, eliminating the need for high-temperature curing. It exhibits excellent early strength and long-term stability. The raw materials can utilize various industrial solid wastes, making it environmentally friendly and economical. It is suitable for emergency repairs, rapid construction, and low-temperature environments.

This application discloses a micro-expansion low-heat silicate cement-based concrete material, its preparation method, and its application, belonging to the field of concrete engineering technology. Each cubic meter of micro-expansion low-heat silicate cement-based concrete material comprises 78-92 kg of water, 82-161 kg of micro-expansion low-heat silicate cement, 28-105 kg of fly ash, 476-608 kg of sand, and 1286-1696 kg of aggregate. The dosage of naphthalene-based water-reducing agent is 0.4 wt%-0.6 wt%, and the dosage of air-entraining agent is 0.014 wt%-0.018 wt%. The air content of the concrete material in the mixed state is 4%-5%, and the slump is 35-50 mm. Through the synergistic proportioning of water, micro-expansion low-heat silicate cement, fly ash, sand, and aggregate, the low heat of hydration and micro-expansion characteristics of micro-expansion low-heat silicate cement are fully utilized.

The present application relates to a kind of converter tapping hole repair material and preparation method, including repair layer, glaze layer, the repair layer is composed of the following raw materials: pretreated high-purity magnesia, carboxymethyl cellulose, binder;The pretreatment of high-purity magnesia: high-purity magnesia is soaked in magnesium sulfate heptahydrate aqueous solution for 24 hours or more, take out and dry at 100~110 ℃ temperature;Glaze layer is composed of the following raw materials: glass powder, potassium feldspar powder, quartz powder, SiC fine powder, chromium oxide green, water.The advantage is: converter tapping hole repair material according to the need characteristics of use position and steel plant, use high-purity magnesia soaked in magnesium sulfate heptahydrate aqueous solution as main raw material, improve the disintegration of material, shorten the replacement tapping hole time.Repair layer disintegration is excellent, the added carboxymethyl cellulose or clay and binder effectively improve the volume stability of repair agent at high temperature.

This application relates to the field of building materials technology and discloses a low-cost micro-expansion ultra-high performance concrete and its preparation method. The raw materials of the concrete include water, cement, silica fume, limestone powder, fine aggregate, coarse aggregate, polycarboxylate superplasticizer, CaO-calcium sulfoaluminate-based composite expansion agent, and sodium polyacrylate-based internal curing agent. The fine aggregate is river sand, and the coarse aggregate is basalt crushed stone. During preparation, the powders are first mixed dry, then an aqueous solution of the superplasticizer is added and stirred into a uniform slurry. The aggregate is then added, stirred, and finally molded and cured. This invention utilizes the internal curing agent to desorb moisture when the internal humidity of the concrete matrix decreases, providing moisture compensation for the later hydration of the composite expansion agent, causing the dense matrix to undergo micro-expansion deformation and convert it into self-stress. This solution effectively compensates for the volume shrinkage caused by the low water-cement ratio, reducing the risk of cracking. Simultaneously, the use of conventional sand and gravel instead of pure quartz sand significantly reduces the cost of large-scale preparation.

The application discloses a low-shrinkage high-airtightness concrete special cementing material and a preparation method thereof. The special cementing material comprises 48-63wt% low-heat Portland cement clinker, 6-14wt% sulphoaluminate cement clinker, 3-5wt% light-burned magnesia, 7-10wt% sub-micron silica fume, 9-18wt% fly ash, 6-12wt% glass powder, 2-3wt% gypsum, 0.03wt% diethanol mono-isopropanol amine and 0.1wt% pre-dispersed carbon nanotubes. The special cementing material has reasonable particle size distribution, and the components produce interactive superposition effects, complement each other and promote each other, so that the cementing material after hydration is continuously compacted, and the airtight concrete prepared by the special cementing material can maintain excellent airtight performance and volume stability at each stage.

The application discloses a kind of geotextile tube high-efficiency dehydration consolidation system and method based on heating drainage plate, including geotextile tube body, still include: set in the heating drainage plate unit of geotextile tube body inside, the heating drainage plate unit includes drainage plate core, filter membrane wrapped in drainage plate core outside and electric heating element inlaid or attached in drainage plate core;With the drainage outlet communication of the heating drainage plate unit Drainage main pipe;The electric heating element is electrically connected with external power supply by wire.The application can realize active heating to mud in bag by integrating internal heating and drainage function, thereby reducing the viscosity of water, destroying capillary action, accelerating water migration, ultimately achieving the effect of greatly shortening dehydration period and reducing final moisture content.

This invention provides a cementitious material based on steel slag solid waste, comprising fly ash, slag, steel slag, and a composite activator, wherein the composite activator includes an alkaline activator, a sulfate activator, nano-hydrated calcium silicate, and polyvinyl butyral. This invention optimizes setting time, improves early and late strength, and enhances volume stability by employing a composite activator to synergistically activate the cementitious activity of fly ash, slag, and steel slag. This cementitious material can replace a portion of cement in concrete, mortar, roadbed materials, etc., achieving efficient utilization of industrial solid waste.

This application discloses a steel pipe jacking core filling material and its preparation method. The raw materials of the steel pipe jacking core filling material in this application include gel material, coarse aggregate, fine aggregate, wetting and dispersing agent, and water. The weight of the wetting and dispersing agent is 1.0-1.5% of the total mass of the gel material. The wetting and dispersing agent is compounded from maleic anhydride copolymer and organic bisacrylic surfactant. The cementing material includes cement, mineral powder, and fly ash. The molecular structure of the maleic anhydride copolymer is comb-shaped. The molecular weight of the main chain of the maleic anhydride copolymer is 5000-100000 g / mol, and the molecular weight of the side chain of the maleic anhydride copolymer is 100-500 g / mol. The molecular structure of the organic bisacrylic surfactant is comb-shaped. The molecular weight of the main chain of the organic bisacrylic surfactant is 5000-100000 g / mol, and the molecular weight of the side chain of the organic bisacrylic surfactant is 2000-5000 g / mol. The filler material in this application has better fluidity and density properties, and better volume stability, which can meet the dual requirements of mechanical properties and durability of lifting filler materials.

The application relates to the technical field of cement materials, and particularly discloses a high ore fused stone ferrite aluminate cement material and a preparation method thereof. The cement material is prepared by jointly grinding and treating high belite ferrite aluminate cement clinker and a modifier. The modifier is composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate is HOOC-CH2-CH2-CO(PO3H2). The modifier composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source is used to perform mechanochemical coupling modification on the belite ferrite aluminate cement clinker, multi-level interface interaction occurs under the induction of mechanical force, directional poisoning and growth inhibition of calcium aluminate crystal nuclei are realized, the early strength of the cement is maintained, and the volume stability of the cement material is significantly improved.

The invention relates to the technical field of building materials and solid waste resource utilization, and discloses high-strength flow-state solidified soil and a preparation method thereof, and the high-strength flow-state solidified soil comprises a composite curing agent which comprises slag powder, ordinary Portland cement, quick lime, fly ash, red mud micro powder, anhydrous sodium sulphate, anhydrous calcium chloride, enteric-coated expanded microspheres and supported chemical trigger microspheres. Wherein the enteric-coated expanded microbeads are provided with pH-sensitive coating layers, and rigid excitation liquid is adsorbed in the supported chemical trigger microbeads. The preparation method relates to the processes of pelletizing and coating of the microbeads, carrier adsorption and low-speed forced stirring. The system pH change is utilized to delay microsphere expansion, and the initial flowability is guaranteed; in the later period, ions released by the microbeads react with the excitation liquid to generate a rigid shell layer, soft expansion is converted into rigid support, the compressive strength and the volume stability of the solidified soil are remarkably improved, and efficient resource utilization of the engineering slurry is achieved.

The invention relates to the field of concrete preparation, in particular to concrete containing sandy slate aggregate and a preparation method of the concrete. The sandy slate aggregate is prepared from the following components in parts by weight: 75 to 100 parts of ordinary Portland cement, 20 to 40 parts of fly ash, 1280 to 1380 parts of sandy slate low-strength aggregate, 300 to 500 parts of medium-strength aggregate, 0.5 to 1.0 part of carboxymethyl hydroxyethyl cellulose, 5 to 10 parts of fine ground gypsum powder, 0.8 to 1.2 parts of polycarboxylate superplasticizer, 0.1 to 0.2 part of air entraining agent and 70 to 110 parts of water. Wherein the granularity index B1 of the sandy slate low-strength aggregate is controlled to be 2.5-2.8, and the shape index S1 of the sandy slate low-strength aggregate is larger than or equal to 0.70. According to the invention, the void ratio is reduced by optimizing the aggregate gradation and the grain shape, and the water consumption and the cementing material consumption are obviously reduced on the premise of ensuring the workability and the strength.

The invention discloses fiber-reinforced solid waste-based concrete and a preparation method thereof, and relates to the technical field of concrete and concrete preparation, the fiber-reinforced solid waste-based concrete is composed of 100 parts of cement, 1 part of short fiber, 250-350 parts of fly ash, 0.8-1.2 parts of rubber powder and 32 parts of water, and the fiber-reinforced solid waste-based concrete is prepared by the method comprising the following production steps: mixing, pulping and molding. According to the invention, 250-350 parts of fly ash is adopted, and the fly ash accounts for 71.4-77.8% of the total amount of the cementing material, which is far higher than the mixing amount lower than 30% in conventional concrete. The utilization rate of the industrial solid waste is greatly improved, and the use amount of the cement is remarkably reduced, so that the energy consumption and carbon dioxide emission in the production process are reduced, and the method has outstanding green and environment-friendly values and economic benefits.

The invention relates to the technical field of water-based damping materials, and discloses a low-expansibility water-based damping material and a preparation method thereof.The low-expansibility water-based damping material is prepared from, by mass, 40-60 parts of water-based polyurethane-acrylate resin, 20-30 parts of water-based polyurethane-acrylate resin, 20-30 parts of water-based polyurethane-acrylate resin, 20-30 parts of water-based polyurethane-acrylate resin, 20- 10 to 20 parts of a silane coupling agent; 30-60 parts of a damping filler; 5-10 parts of a dispersant; 3-10 parts of a film forming agent; 0.3 to 1 part of a defoaming agent; and 0.5-3 parts of a thickening agent. The damping characteristic of the WPUA resin is organically combined with the interface enhancement and network crosslinking functions of the silane coupling agent, and the comprehensive high-performance water-based damping material with low expansion, high stability, strong adhesion and corrosion resistance is successfully prepared.

The invention relates to sprayed concrete and a preparation method thereof, and relates to the technical field of concrete.The sprayed concrete is prepared from, by weight, 365-410 parts of cement, 790-830 parts of fine aggregate, 710-760 parts of coarse aggregate, 70-100 parts of fly ash, 75-95 parts of modified yellow phosphorus slag, 12-16 parts of accelerator, 4.5-7 parts of water reducer, 3-6.5 parts of natural plant admixture and 155-175 parts of water; the natural plant additive is prepared from beet root tubers and gelidium amansii in a weight ratio of (1-2): (5-9). On the basis of an existing shotcrete batching system, the natural plant admixture and the modified yellow phosphorus slag are introduced, all the components have a synergistic effect, the construction requirements for the initial strength and the later strength of the shotcrete are met, the rebound rate of the shotcrete is remarkably reduced, and the shotcrete has a good application prospect. The method can be widely applied to construction of various supporting projects such as tunnels and roadways.

The invention relates to the technical field of cement materials, and particularly discloses a high-ore-melting-stone iron aluminate cement material and a preparation method thereof. The cement material is prepared by grinding high belite sulfur iron aluminate cement clinker and a modifier together. The modifier is composed of succinyl phosphonate, quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate ester is HOOC-CH2-CH2-CO (PO3H2). According to the invention, a modifier composed of succinyl phosphonate, quaternary ammonium salt and an aluminum source is used for carrying out mechanochemical coupling modification on belite pyrite aluminate cement clinker, and multi-level interface interaction occurs under the induction of mechanical force, so that directional poisoning and growth inhibition of ettringite crystal nucleus are realized; and the volume stability of the cement material is remarkably improved while the early strength of the cement is maintained.

This application relates to an admixture for riprap concrete engineering, comprising at least the following components: a starch-dextrin retarder, an activator, a polycarboxylate thixotropic agent, and a water-reducing agent. The admixture is used to modify the workability and hardening properties of high self-compacting concrete. The mass percentages of each component are as follows: starch-dextrin retarder: 1.6%-3.5%; activator: 5.2%-21.3%; polycarboxylate thixotropic agent: 0.25%-0.90%; water-reducing agent: 75.2%-90.5%. Adding this admixture to high self-compacting concrete used in riprap concrete engineering can improve the workability of high self-compacting concrete, such as fluidity, thixotropy, and a longer initial setting time, while also providing good volume stability, good impermeability and frost resistance, and lower cement content, resulting in significant economic benefits.

The invention relates to the technical field of concrete, in particular to concrete special for ground terraces and a preparation method of the concrete. The special concrete for the ground and the terrace is prepared from the following raw materials in parts by weight: 300 to 500 kg / m < 3 > of cement, 600 to 750 kg / m < 3 > of fine aggregate, 900 to 1200 kg / m < 3 > of medium-coarse aggregate, 15 to 40 kg / m < 3 > of bentonite, 30 to 60 kg / m < 3 > of high-performance water reducing agent, 10 to 30 kg / m < 3 > of retarder, 10 to 20 kg / m < 3 > of stabilizer, 300 to 600 kg / m < 3 > of water and 10 to 20 kg / m < 3 > of corrosion-resistant enhancer. The retarder is prepared by mixing the following raw materials in parts by weight: 5-20 parts of expanded perlite, 7-15 parts of sodium lignin sulfonate, 4-8 parts of borax, 2-6 parts of sodium hexametaphosphate and 2-7 parts of tartaric acid. The special concrete for the ground and the terrace, prepared by the invention, has good compression resistance, and also has good durability and collapse resistance.