20 results about "Chemical admixture" patented technology

The invention discloses continuous grading low-density oil well cement, low-density cement paste and a preparation method, and particularly, cement clinker, natural gypsum, fly ash, slag powder and silica fume are crushed, ground and screened to obtain continuous grading cement, the continuous grading cement is mixed with lightweight material perlite and chemical additives, and the density of the cement is adjusted while the density of the cement is adjusted, so that the continuous grading low-density oil well cement is obtained. And the particle size distribution between the cement and each material is optimized, so that the accumulation proportion between the materials reaches the maximum, the tensile strength is increased, and the porosity and permeability are reduced, thereby preventing the migration of formation fluid along a set cement matrix, effectively improving the fluid invasion resistance of a cement sheath, and further improving the early strength of the low-density set cement.

The utility model belongs to the field of mineral admixture processing, and provides a mineral admixture batching device which comprises a machine frame, a batching box is arranged on the machine frame, a feeding port is formed in the top of the batching box, a discharging port is formed in the bottom of the batching box, a top cover is arranged on the feeding port, a discharging door is arranged on the discharging port, and the feeding port and the discharging door are arranged on the machine frame. An opening assembly used for controlling opening of the discharging door is arranged on the side wall of the batching box, a left adding box and a right adding box are arranged on the rack, outlets of the adding boxes are communicated with the batching box, a batching mixing mechanism is arranged in the batching box, and the batching mixing mechanism comprises a pair of square shafts rotationally installed in the batching box. When the equipment is used for batching, firstly, cement is poured from the feeding hole, a chemical admixture and a solid mineral admixture quantitatively flow into the batching box according to the proportioning requirement, the batching and mixing mechanism fully mixes the cement, the chemical admixture and the solid mineral admixture, and finally, the uniformly mixed mineral admixture is discharged from the discharging hole and enters a subsequent production link.

The invention relates to a high-strength ecological brick containing an organic composite additive and a preparation method of the high-strength ecological brick. The high-strength ecological brick is prepared from construction waste, decorative waste, Portland cement and the organic composite additive, wherein the organic composite additive is obtained by reacting a chemical additive, an organic compound and an esterification catalyst. The organic composite admixture is doped to improve the reaction activity in the mixture, so that the strength of the ecological brick is improved, and the compressive strength of the ecological brick in 1 day and 7 days is improved by 20-25% compared with the compressive strength of the ecological brick in which the organic composite admixture is not doped; the method is simple and easy to implement, low in cost and environmentally friendly, the strength of the ecological brick can be improved by 10%-30%, and a new thought is provided for preparing the high-strength ecological brick from construction waste and decoration waste.

The application belongs to the technical field of energy storage building materials, and discloses a gypsum-based light energy storage functional integrated building material, which is composed of a gypsum-based cementing material, a conductor precursor, porous light aggregates, chemical admixtures and mixing water, wherein the conductor precursor is composed of carbon nanomaterials, alkali metal sulfate, an anionic surfactant and water; through multi-dimensional material design, the conductor precursor prepared by using a hydrothermal / solvent thermal method has extremely high activity, the porous light aggregates and the chemical admixtures are introduced, and an "ion-electron" mixed conductive network is effectively constructed in the gypsum matrix, so that the electrochemical energy storage performance of the composite material is significantly improved, the integrated gypsum-based building material with excellent mechanical properties and high-efficiency electrochemical energy storage function is obtained, and the energy storage of the building envelope structure is realized.

A method for designing a cement slurry comprising: (a) selecting at least one cement and a concentration thereof, water and a concentration thereof, and one or more chemical additives and a concentration thereof, such that a cement slurry is formed from the cement, the one or more chemical additives, and the water, meeting a density requirement; (b) calculating a thickening time of the cement slurry at wellbore temperature using a thickening-time model;(c) comparing the thickening time of the cement slurry with a thickening time requirement and performing steps (a)-(c) if the thickening time of the cement slurry does not meet or exceeds the thickening time requirement, wherein the selection step comprises selecting different concentrations and / or different chemical identities for the cement and / or one or more chemical admixtures than those previously selected, or performing step (d) if the thickening time of the cement slurry meets or exceeds the thickening time requirement; and (d) preparing the cement slurry.

This invention discloses a method for simultaneously improving the mechanical properties and moisture transport properties of high-volume fly ash mortar using chemical admixtures. The steps include: 1. Selecting multiple chemical admixtures, with their respective dosages as independent variables, and using response surface methodology to prepare multiple groups of high-volume fly ash mortar. 2. Testing their compressive strength, splitting tensile strength, first-stage water absorption coefficient, and second-stage water absorption coefficient after 28 days of curing, using these as dependent variables. 3. Establishing the mathematical relationship between the mechanical properties and moisture transport properties and influencing factors, predicting the optimal chemical admixture dosage, and preparing high-volume fly ash mortar based on this prediction. The accuracy of the match between the predicted and actual values ​​is then measured and verified. This invention addresses the difficulty of simultaneously improving the mechanical properties and moisture transport properties of high-volume fly ash mortar by applying experimental design and rationally using chemical admixtures to simultaneously improve both properties.

The application discloses green cast-in-situ high-strength light-weight foam concrete and belongs to the technical field of new materials. The concrete comprises cement 30-50 parts by weight, light-weight foam aggregate 20-40 parts by weight, fine aggregate 15-30 parts by weight, water 15-25 parts by weight, foaming agent 0.1-1.0 parts by weight, mineral admixture 5-15 parts by weight and chemical additive 0.1-2 parts by weight. The chemical additive contains high-efficiency water-reducing agent, modified retarder and air entraining agent, and the weight ratio is (5-7):(2-3):(1-2). The mechanical properties (compressive strength 20.5-24.5 MPa), durability (water absorption 3.4-4.0%) and construction performance (slump 162-175 mm) are remarkably improved by virtue of the modified retarder, nano-modified light-weight foam aggregate and fine aggregate, and the optimization of mixing proportion and preparation process. The carbon footprint is reduced by using industrial by-products, and the green environmental protection and economy are realized. The application is suitable for cast-in-situ high-strength light-weight structure, and has the advantages of light weight, high strength, durability and construction convenience, and provides a sustainable solution for modern engineering.

The invention discloses an early-strength and high-toughness cement-based composite material and a preparation method thereof. The early-strength and high-toughness cement-based composite material comprises the following components in parts by weight: 80-100 parts of a cementing material system, 1.5-3.0 parts of reinforced fibers, 30-50 parts of aggregate, a chemical additive which accounts for 0.5%-2.0% of the total mass of the cementing material system, and water, wherein the mass ratio of the water to the cementing material system is (0.22-0.28): 1; the cementing material system comprises ordinary Portland cement, sulphoaluminate cement and high-activity micro powder. According to the invention, synergistic breakthrough of material performance is realized: firstly, early strength meeting rapid construction requirements is achieved at the early stage of maintenance (such as 12 hours and 24 hours); 2, the material can still show remarkable strain hardening characteristic and limit tensile strain of 3% or above while high early strength is obtained, and the material has multiple fine crack development capability.

The application discloses a concrete mixing main machine visual monitoring system and method, and belongs to the technical field of concrete production automation and intelligent quality control, which comprises the following steps: S1, collecting a video image sequence of concrete movement in a mixing main machine in real time; S2, extracting a dynamic visual feature vector and a static feature vector based on the video image sequence; S3, calculating an internal rheological state index based on the dynamic visual feature vector and a preset dynamic rheological-visual feature coupling model; S4, calculating a basic slump prediction value based on the static feature vector and a preset static correlation model; S5, determining a final corrected slump by a preset correction function in combination with the internal rheological state index and the basic slump prediction value; and S6, calculating a comprehensive risk index according to the final corrected slump, the basic slump prediction value and the internal rheological state index. The application can deeply capture the internal rheological characteristics caused by chemical admixtures, which cannot be perceived by traditional visual methods.

The invention belongs to the technical field of chemical admixtures of building materials, and particularly relates to a polycarboxylate superplasticizer for anti-crack gypsum-based self-leveling mortar as well as a preparation method and application of the polycarboxylate superplasticizer. The preparation method of the polycarboxylic acid water reducing agent for the anti-cracking gypsum-based self-leveling mortar sequentially comprises the following steps: activating a macromonomer, preparing a prepolymer, carrying out hydrosilylation, nano-compounding, crosslinking and regulating and controlling dynamic bonds. According to the polycarboxylate superplasticizer for the anti-crack gypsum-based self-leveling mortar, the utilization rate of a functional unit can be increased to 92% or above through multi-scale regulation and control of heterocyclic coordination, dynamic bond controlled release, metal chelating, siloxane crosslinking and micro-nano filling, and the initial expansion degree of the gypsum-based self-leveling mortar in a low-temperature environment of-10 DEG C can reach 315-350 mm; the 28d compressive strength is improved by 25-30%, the 28d anti-cracking grade in a 90% high-humidity environment is kept at 0 grade or 1 grade, the strength loss rate is less than or equal to 14.5% after 25 times of cyclic freezing and thawing under the condition of-20 DEG C to 20 DEG C, and the application prospect is wide.

This invention provides a self-healing grouting material, its preparation method, and its application. By weight, the raw materials of the self-healing grouting material include the following components: 100 parts of cementitious material; 40-80 parts of water; 5-40 parts of polypropylene fiber-diatomite composite microbial carrier; 0-40 parts of mineral admixtures; and 0-5 parts of chemical additives. The polypropylene fiber-diatomite composite microbial carrier comprises a polypropylene fiber core layer and a diatomite gel shell layer. The diatomite gel shell layer is a gel network structure with embedded porous diatomite particles loaded with microorganisms. This invention solves the problem of insufficient timeliness of water-blocking performance in rock strata grouting in existing technologies, achieving long-term, adaptive sealing of seepage channels in rock strata fissures, and effectively enhancing the durable water-blocking capacity and overall stability of modified rock strata.

The invention discloses a high-activity metakaolin-based composite mineral admixture as well as a preparation method and application thereof. The preparation method of the high-activity metakaolin-based composite mineral admixture comprises the following steps: adding a grinding aid into a kaolin-based material, and grinding to obtain kaolin-based material powder; carrying out ball-milling mixing on the kaolin-based tailing powder and an aluminum-based eutectic agent to obtain a raw material, drying the raw material, and carrying out stepped calcination to obtain a metakaolin-based material; carrying out ultrasonic dispersion mixing on the composite chemical admixture solution and the metakaolin-based material, and drying to constant weight to obtain an admixture-loaded high-activity metakaolin-based material; uniformly mixing the high-activity metakaolin-based material and the vaterite-based material to obtain a high-activity metakaolin-based composite mineral admixture; the admixture is mixed with a vaterite stabilizer to be applied to a cement-based material. The admixture disclosed by the invention has high activity, and is beneficial to improving the working performance of a cement-based material, and improving the strength and durability of the cement-based material at the same time.

The invention discloses a high-strength early-strength concrete pole based on chemical admixtures and a preparation method thereof, and belongs to the technical field of concrete. The high-strength early-strength concrete pole comprises high-strength early-strength concrete and a steel reinforcement framework; the high-strength and early-strength concrete comprises the following components in proportion: 450-500 kg / m < 3 > of cement, 50-60 kg / m < 3 > of silica fume, 50-80 kg / m < 3 > of fly ash, 600-700 kg / m < 3 > of sand, 1100-1200 kg / m < 3 > of gravel, 60-80 kg / m < 3 > of steel fiber, 8-15 kg / m < 3 > of a water reducing agent, 5-10 kg / m < 3 > of an additive and 130-150 kg / m < 3 > of water. The additive comprises a nitric acid tripolyglycerol polyammonium salt which is obtained by carrying out coupling reaction on fluorine-containing benzoic acid tripolyglycerol ester and monoamino protection diaminoalkyl methylamine.

The invention provides a grouting material for an offshore wind power foundation structure and a preparation method of the grouting material, and relates to the technical field of cement-based grouting materials. The grouting material comprises a solid raw material and a liquid raw material, the solid raw material comprises a diversified gel material system, straight steel fibers, hook-end steel fibers and auxiliaries, and the diversified gel material system is mainly composed of Portland cement, high-activity silica fume, fly ash microspheres, superfine limestone powder, superfine slag powder and quartz sand; the auxiliary agent comprises a chemical additive and a bio-based self-repairing agent. The grouting material has the technical effects of high early-stage and later-stage strength, high elastic modulus, excellent corrosion resistance, good environmental protection property and self-repairing function, solves the problems of environmental adaptation and structural maintenance of offshore wind power foundation structures, can bear complex and irregular impact load on the sea, can resist corrosion of seawater, and has the advantages of high strength, high elasticity modulus, excellent corrosion resistance and good self-repairing performance. And micro cracks are self-repaired, and the harsh application requirements of offshore wind power engineering are better met.

The invention belongs to the technical field of special engineering materials, and particularly relates to an anti-crack grouting material for floating offshore wind power tower tube floating body connection and a preparation method, the anti-crack grouting material comprises the following raw materials by weight: 25-40 parts of cement, 1-12 parts of a superfine active filler, 40-55 parts of quartz sand, 1-5 parts of nano modified powder, 0.1-1.2 parts of a composite chemical admixture, and 0.1-0.8 part of an expanding agent, and 0.005 to 0.1 part of hybrid fiber. According to the invention, the porosity of a matrix is reduced and the growth of a hydration product is promoted by optimizing the grain composition of the raw materials and introducing nano-particle crystal nucleuses and hybrid fibers, and the anti-cracking and high-toughness cement-based grouting material is prepared by physically resisting cracks and consuming crack propagation energy; the grouting material has the characteristics of large flow state, high retention, ultrahigh strength, high toughness, crack resistance, high durability and the like, the crack resistance and long-term durability of the grouting material for connecting the floating offshore wind power tower tube floating body are ensured, and the high-fluidity construction requirement of the grouting material is met.

The invention relates to the technical field of inorganic composite materials, in particular to a fireproof, moistureproof, wear-resistant and corrosion-resistant inorganic sheet and a preparation method thereof. The sheet comprises a cementing material composite system, a complexing agent, a graded aggregate system, a hybrid fiber reinforced network, a chemical additive and water, and during preparation, vacuum roll forming and high-temperature and high-pressure steam curing processes are adopted to synergistically improve mechanical and durability. The sheet has excellent fireproof, moisture-proof, wear-resistant and corrosion-resistant performance, the overall performance is synergistically improved, and the sheet is suitable for building and decoration materials in severe environments.

It is disclosed the use of amorphous silica reagent produced from serpentine as pozzolane additive material, and more particularly a concrete mixture, such as high performance and ultra-high performance concrete, comprising a hydraulic binder; sand; aggregates, chemical admixture, mineral admixture as silica fume and an amorphous silica reagent (AmSR), wherein the AmSR is admixed for example with General Use Portland Cement and provides synergistic effect when combined with silica fume.

The invention provides a composite nano-amine modified ecological brick and a preparation method thereof. The ecological brick is prepared from construction waste, decorative waste, Portland cement and a nano-amine composite chemical admixture, wherein the nano amine composite chemical admixture is prepared from a chemical admixture and a nano composite material; the nanocomposite is made from a hydrated calcium silicate nanomaterial and a polycarboxylate ether (PCE). The nano-amine composite chemical admixture is introduced into the construction waste composite material, cement hydration is improved, the water cement ratio is reduced, small pores can be filled with the nano-material, the pore structure is more compact, meanwhile, the fitting effect of ions in the construction waste and the decorative waste can be stimulated to react with cement, and therefore the construction waste can be better cured. Therefore, the overall mechanical property and durability of the ecological brick are remarkably improved.

The invention discloses a high-adhesion impervious coal seam extraction grouting hole sealing material and a preparation method thereof, and particularly relates to the technical field of coal mine engineering materials, the material is composed of the following components: a basic cementing material, a nanoscale functional filler, a polymer modifier, a chemical additive, a physical reinforcing component and mixing water. The preparation method comprises the following steps: S1, dry mixing pretreatment; s2, preparing a liquid material; s3, mixing and stirring; s4, fiber dispersion; s5, quality detection and application. Through the synergistic effect of all the components, the material has high bonding strength and high impermeability and has excellent fluidity, crack resistance and durability, the technical problems that a traditional hole sealing material is prone to leakage and poor in bonding performance are effectively solved, and the hole sealing material is particularly suitable for efficient sealing of coal mine gas extraction drill holes.

The invention discloses high-bainite cement-based sulfate-erosion-resistant special concrete as well as a preparation method and application thereof, and belongs to the field of building materials. Aiming at the problems of low early strength, poor corrosion resistance and poor dry and wet adaptability of the existing sulfate-resistant concrete, the concrete takes high belite cement as a main gelling component, and is matched with auxiliary gelling components containing sulphoaluminate cement, silica fume and the like, the aggregate contains functional fine aggregate, the water-binder ratio is 0.28-0.35, and a specific chemical additive is supplemented. Three-stage variable-frequency stirring is adopted for preparation, and water retention and wet maintenance are carried out for more than or equal to 14 days after pouring. The 90-day sulfate attack resistance coefficient is larger than or equal to 1.5 (4000 mg / L sulfate radical), the 7-day compressive strength is larger than or equal to 40 MPa, the total porosity is smaller than or equal to 15%, and the composite material is suitable for the environment (such as an ocean tidal zone and a salinized soil roadbed) with the sulfate radical of 2000-8000 mg / L and the wetting and drying alternation of larger than or equal to 3 times / month, and performance and economical efficiency are both considered.