676 results about "Superplasticizer" patented technology

The invention discloses sound-insulation and heat-insulation building mortar and a preparation method thereof, and relates to the technical field of building materials, the sound-insulation and heat-insulation building mortar comprises, by weight, 42-48 parts of a cementing material, 15-25 parts of an auxiliary material, 17-22 parts of lightweight aggregate, 30-35 parts of a functional filler, and 1-2 parts of an additive; the cementing material is a mixture of sulphoaluminate cement and Portland cement; the auxiliary material is a mixture of fly ash and quartz sand, the lightweight aggregate is a mixture of 20-40-mesh hollow vitrified microbeads and 70-90-mesh hollow vitrified microbeads, and the mass ratio of the hollow vitrified microbeads to the hollow vitrified microbeads is 1: (2-3); the functional filler is a mixture of modified waste rubber particles and modified fibers; the additive is a mixture of a polycarboxylate superplasticizer and hydroxypropyl methyl cellulose ether. The mortar disclosed by the invention is good in thermal insulation performance and excellent in mechanical property, the method disclosed by the invention is simple to operate and low in cost, and the prepared mortar is excellent in performance.

The invention discloses shrinkage-free aluminoferrite cement-based ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of novel wall materials, and the shrinkage-free aluminoferrite cement-based ultra-high performance concrete comprises the following components: an activated cementing material, mineralized aggregate, an additive, reinforced fibers and mixing water. Due to the slow release effect of the methyl cellulose coating on the composite expanding agent, precise compensation of self-constriction is achieved, and contraction deformation in the curing and using process is effectively inhibited. Due to the unique mineral composition of the aluminoferrite cement, the early strength of the concrete is sharply improved, and the production cycle of prefabricated parts is greatly shortened. The steel fibers subjected to sand blasting and pre-wrapping modification can effectively bridge microcracks in the concrete and limit crack propagation; the polycarboxylate superplasticizer disperses the modified carbon nanofibers, crack initiation is inhibited from the microscopic level, and mechanical properties such as fracture resistance and impact resistance of the joint part and the prefabricated part are remarkably improved through cooperation of the polycarboxylate superplasticizer and the modified carbon nanofibers.

The invention belongs to the field of building decoration materials, and discloses a GRG gypsum composite reinforced material and a preparation method thereof. The high-strength concrete is prepared from the following components in parts by weight: 45 to 65 parts of alpha-semi-hydrated gypsum, 12 to 20 parts of composite reinforced fiber, 0.5 to 2 parts of graphene nanofiber, 2 to 5 parts of nano silica fume, 5 to 10 parts of ethylene-vinyl acetate copolymer latex powder, 1 to 2.5 parts of hydroxypropyl methyl cellulose, 0.1 to 0.8 part of polycarboxylic acid type water reducing agent, 1 to 4 parts of calcium stearate, 3 to 8 parts of vermiculite powder and 28 to 40 parts of deionized water. Aiming at the problems that an existing GRG material is insufficient in mechanical property, low in fireproof grade, poor in thermal performance, poor in durability and the like, a multi-dimensional synergistic enhancement system is constructed by adopting composite reinforced fibers, functional nanofiller and a gradient preparation process, the problems of dispersion and interfacial compatibility of the nanofiller are solved, and the comprehensive performance of the GRG material is improved. The performance breakthrough of high strength, high fire resistance, low heat conduction and long durability is realized.

The invention provides low-carbon premixed concrete based on industrial solid waste synergistic activation and a preparation method of the low-carbon premixed concrete. The low-carbon premixed concrete is prepared from the following components: a nano silicon-based anti-corrosion early strength agent, a cementing material, recycled aggregate, electric furnace tailings, waste carbon fibers, a polycarboxylate superplasticizer and water, the preparation method comprises the following steps: S1, preparing a nano silicon-based anti-corrosion early strength agent through silane hydrolysis and modification reaction of nano silicon dioxide; s2, preparing a cementing material: mixing fly ash, steel slag, mineral slag and Portland cement, calcining, grinding, spraying a composite alkali activator, and aging; s3, mixing and forming: wet-mixing the cementing material, the recycled aggregate, the iron tailing sand, the waste fibrilia, the nano silicon-based anti-corrosion early strength agent, the polycarboxylate superplasticizer and water, and pre-injecting and forming; and S4, carbonization curing. According to the invention, efficient utilization of industrial solid waste is realized, and the low-carbon environmental protection performance and mechanical property of the concrete are improved.

The invention relates to the technical field of concrete, and discloses durable concrete and a preparation method thereof.The durable concrete is obtained by adding cement, gravel, fly ash, a polycarboxylate superplasticizer, quaternized triazinyl polyurethane, modified cyclodextrin and water into a stirrer and stirring the materials evenly. A quaternary ammonium salt group in the quaternized triazinyl polyurethane can effectively reduce the adsorption of the clay to the water reducing agent, so that the mixing amount of an additive is reduced, and the working performance and durability of the concrete are improved; wherein the triazinyl group has certain chemical stability and corrosion resistance, so that chlorine salt erosion of the concrete in a severe environment is reduced, and the service life of the concrete is prolonged.

The invention relates to the technical field of preparation of building materials, and discloses an ultra-high performance polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete). The superplasticizer composition comprises the following components in parts by weight: 20-30 parts of ethyl acrylate; 20 to 30 parts of sodium acrylate; the invention also provides a preparation method of the ultra-high performance polycarboxylate superplasticizer for UHPC, and the preparation method comprises the following steps: S1, raw material preparation: dissolving ethyl acrylate, sodium acrylate, sodium allylsulfonate, hexadecyl acrylate and diene peroxide in 50-100 parts of water to form a uniform solution; and S2, mixing and pre-polymerizing. By introducing nano silicon dioxide, an ultrasonic dispersion technology and a low-temperature vacuum dehydration technology, the dispersity and anti-permeability of the water reducing agent and the fluidity of concrete are improved, meanwhile, high strength is kept, and the problems that concrete is uneven in performance and poor in constructability are solved.

The invention relates to the technical field of concrete waterproofing agents, in particular to a high-efficiency concrete anti-crack waterproofing agent and a preparation method thereof, and the high-efficiency concrete anti-crack waterproofing agent is prepared from the following raw materials in parts by weight: a calcium sulphoaluminate expanding agent; light burning of magnesium oxide; re-burning the magnesium oxide; nano-scale silicon dioxide; metakaolin; polypropylene fibers; basalt fibers; styrene-acrylic emulsion; a silane emulsion; silica fume; hydroxypropyl methyl cellulose; and a polycarboxylic acid water reducer compatilizer. According to the high-efficiency concrete anti-crack waterproof agent disclosed by the invention, the nano-silica, the metakaolin and the styrene-acrylic emulsion synergistically block nano-to-macroscopic multi-stage pores, so that double waterproofing of physical filling and chemical film forming is realized; the polypropylene and the basalt fiber are subjected to ultrasonic dispersion and interface combination optimization to form a three-dimensional anti-crack network, the component uniformity and the functional stability are ensured through precise proportioning, graded mixing and directional granulation, meanwhile, the waterproof agent is compatible with industrial production fluctuation, large-scale application reliability is ensured, and the problems that a traditional waterproof agent is single in function and insufficient in durability are solved.

The invention belongs to the technical field of concrete, and particularly discloses an aerated concrete block and a preparation method thereof. The aerated concrete block is prepared from the following raw materials in parts by weight: 70 to 80 parts of water, 25 to 30 parts of Portland cement, 30 to 35 parts of sand, 3 to 5 parts of aluminum powder, 1 to 3 parts of polycarboxylate superplasticizer, 7 to 9 parts of lime, 10 to 15 parts of modified waste rubber powder, 10 to 12 parts of hollow glass beads and 12 to 16 parts of modified polystyrene fiber. The aerated concrete block prepared in the invention has good strength, compactness and tensile strength, and the strength, durability and stability of the aerated concrete block are improved.

The invention relates to a polycarboxylate superplasticizer compounding production line. The production line comprises an intelligent raw material pretreatment unit, a multi-component precise proportioning unit, a gradient temperature control compounding reaction unit, an online quality monitoring feedback unit and a finished product self-adaptive filling unit which are connected in sequence. The multi-component precise proportioning unit is internally provided with a dynamic proportioning adjusting system, and the feeding amount can be corrected according to the solid content deviation of raw materials and the target fluidity; the gradient temperature control compound reaction unit realizes temperature and speed coordinated regulation and control through a sectional temperature control module and a stirring speed linkage device; and the online quality monitoring feedback unit forms closed-loop control with the above two units by means of a near infrared spectrum detection module. The invention aims to solve the problem that the existing production line lacks the dynamic ratio adjustment of the actual solid content deviation of the raw material and the target fluidity, the reaction stage temperature control and stirring rate cooperative regulation and control and the online detection closed-loop control; therefore, the problems of low proportioning precision, poor reaction process controllability and large performance fluctuation of the water reducing agent are solved.

The invention discloses green low-carbon ultra-high performance concrete with full-granularity steel slag and a preparation method of the green low-carbon ultra-high performance concrete. 800-1000 parts of an ultra-high performance concrete binding material and 1100-1400 parts of full-granularity steel slag are placed in a stirring pot and fully mixed; 2-5 parts of a polyether defoaming agent, 3-10 parts of a C-F-S-H crystal nucleus early strength agent, 15-20 parts of a high-performance polycarboxylate superplasticizer and 144-180 parts of water are added into a stirring pot and fully mixed; and adding 160-190 parts of superfine copper-plated steel fibers into the stirring pot, and fully mixing to obtain the green low-carbon ultra-high performance concrete. According to the green low-carbon ultra-high performance concrete with the full-granularity steel slag and the preparation method of the green low-carbon ultra-high performance concrete, the problems that in traditional UHPC, the consumption of silica fume is large, energy consumption is high, and carbon emission is high are solved.

The invention discloses a coal gangue-based reinforced cement composite material and a preparation method thereof, and relates to the technical field of building materials. The coal gangue-based reinforced cement composite material is prepared from a coal gangue-based reinforced admixture, calcium ion doped modified multi-walled carbon nanotubes, polypropylene fibers, P.O42.5 Portland cement, metakaolin, silica fume, a polycarboxylate superplasticizer and water, calcium ion doped modified multi-walled carbon nanotubes and a coal gangue based reinforced admixture are cooperatively added into a cement matrix, seamless filling from nanometer to micrometer is achieved, a tough interface transition area is formed, pressure is jointly borne by a compact matrix and a strong interface, the compressive strength and breaking strength of the material are remarkably enhanced, and meanwhile, the compressive strength and breaking strength of the material are greatly improved. Migration of moisture and ions is effectively blocked, and the anti-permeability performance of the material is improved.

The invention discloses a temperature control anti-cracking structure for mass concrete of a power plant and a construction method. According to the invention, the combination of the low-heat Portland cement and the composite admixture effectively reduces early hydration heat, reduces microcracks caused by thermal stress, and improves the compactness and stability of the concrete. And secondly, the compactness of the concrete is further ensured through reasonable grading of the machine-made sand and the granite macadam, and the structural integrity is enhanced. Functional additives such as a polycarboxylate superplasticizer and a magnesium oxide expanding agent not only improve the working performance of the concrete, but also offset the shrinkage stress through the delayed expansion effect, thereby effectively preventing the generation of cracks. In addition, due to the introduction of the phase change microcapsule material, the polypropylene fiber and the steel fiber, the temperature control and crack resistance of the concrete is remarkably enhanced through hydration heat absorption and double-fiber synergistic toughening.

The invention discloses a C6 monomer polycarboxylate superplasticizer and a preparation method thereof. The C6 monomer polycarboxylate superplasticizer is prepared from the following raw materials in parts by mass: 300-380 parts of C6 ethylene glycol monovinyl polyglycol ether polyether macromonomer, 7.5-11.0 parts of acrylic acid, 0.3-1 part of chain transfer agent, 0.15-1.0 part of reducing agent and 0.6-1.2 parts of oxidizing agent. The water reducing agent prepared by the invention has the advantages of simple process, energy conservation, environmental protection, shortened synthesis time, improved production efficiency, high adaptability and better water reducing property.

The invention discloses concrete cured by CO2 and a preparation method of the concrete, and belongs to the technical field of building materials. The concrete comprises the following components in parts by weight: 350-500 parts of a cementing material; 50 to 200 parts of a CO2 load substance; 600 to 800 parts of fine aggregate; 700 to 1000 parts of coarse aggregate; 5-20 parts of a polycarboxylate superplasticizer; and 130 to 170 parts of water. According to the invention, the CO2 load with a double-layer phase change structure is utilized to realize the controlled release of CO2 in stages, the gradually slowly released CO2 and the cementing material are subjected to mineralization reaction to form carbonized products, namely calcium carbonate and silica gel, so that the densification of a matrix is promoted, and the strength, hardness and durability are further improved; the slow-release CO2 curing reduces the energy consumption caused by autoclaved curing of the concrete, greatly shortens the curing time, reduces the production cost and improves the production efficiency.

The invention discloses low-carbon red-mud-based alkali-activated foam concrete and a preparation method thereof, and belongs to the field of low-carbon foam concrete. Specifically, the mix proportion and the preparation method of the low-carbon red-mud-based alkali-activated foam concrete are as follows: P.O42.5 ordinary Portland cement provided by building materials in Qingdao Weidong macro, the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd., and Jinshu New Material Co., Ltd., the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd. The Bayer process red mud powder is produced by Hebei Province Shihozhuangfei Mine Product Co., Ltd. The exciting agent is selected from an industrial liquid sodium silicate solution produced by Henan Jinmoistening New Material Co., Ltd. And solid sodium hydroxide particles with AR analytical purity of 96%; the admixture is selected from a TR-26C type polycarboxylate superplasticizer produced by Henan Fuhua Information Science and Technology Co., Ltd. And the foaming agent is a TR-E type animal protein foaming agent produced by Henan Zhuichun Information Science and Technology Co., Ltd. Compared with existing foam concrete, the low-carbon alkali-activated foam concrete provided by the invention uses a large amount of industrial solid waste, reduces the use cost, reduces the use amount of cement under the condition of ensuring the compressive strength, and is simple and convenient to operate, reasonable in process, low-carbon, environment-friendly, rapid in cement setting and hardening, and suitable for large-scale use.

The invention belongs to the field of light low-carbon concrete, and discloses hydraulic low-carbon concrete containing barium sulfate barite as well as a preparation method and application of the hydraulic low-carbon concrete. The concrete is prepared from 42.5-grade Portland cement, barium sulfate barite powder, modified polypropylene fiber, industrial waste residue lightweight aggregate, boron carbide powder, nano silicon dioxide, a polycarboxylate superplasticizer, a composite exciting agent and water according to specific parts by weight. Wherein the barium sulfate barite powder is subjected to graded proportioning and calcination activation, the modified polypropylene fiber is treated by plasma and a silane coupling agent, the industrial waste residue lightweight aggregate is formed by compounding fly ash ceramsite and steel slag microbeads, and the composite exciting agent is composed of specific components. The concrete is high in compressive strength, low in dry density, excellent in neutron shielding and gamma ray attenuation performance and low in chloride ion diffusion coefficient. The preparation method comprises the steps of premixing modification, gradient stirring, vibration compaction and steam curing. The concrete is suitable for construction of a nuclear reactor containment, a radioactive waste repository and a nuclear medicine protection wall.

The invention relates to the technical field of polycarboxylate superplasticizers, and discloses a durability-enhanced polycarboxylate superplasticizer and a preparation method thereof.The preparation method comprises the following steps that raw materials such as a polyether macromonomer are prepared, the polyether macromonomer and the like have the requirements for purity and dosage, deionized water and the polyether macromonomer are added into a reaction kettle to form a solution A, and the solution A is prepared; and preparing an initiator solution B with the mass concentration of 10-20% from ammonium persulfate, heating to 60-80 DEG C, stirring, firstly adding 1 / 3 of the initiator solution B to react, then preparing a mixed monomer solution from acrylic acid and the like, dropwise adding the mixed monomer solution and the residual initiator solution B within 2-3 hours, carrying out heat preservation reaction, cooling, and regulating the pH value to 6-8 by using sodium hydroxide to obtain a finished product. The sulfonic acid group of the introduced sodium methallyl sulfonate functional monomer can enhance the electrostatic repulsion between water reducer molecules and cement particles, so that the dispersing performance of the water reducer is improved, the agglomeration of the cement particles can be inhibited to a certain extent, and the fluidity of concrete can be maintained.

The invention discloses a high-toughness grouting material and a preparation method thereof, and belongs to the technical field of building materials. The photochromic thermal insulation material is prepared from the following raw materials in percentage by mass: 30 to 36 percent of sulphoaluminate cement, 28 to 32 percent of quartz sand, 0.4 to 0.9 percent of nano graphene / carbon tube hybrid, 12 to 15 percent of superfine composite admixture, 1.0 to 1.8 percent of temperature-sensitive shape memory alloy fiber, 1.5 to 2.0 percent of microbial self-repairing capsule, 15 to 18 percent of photochromic epoxy hybrid emulsion, 0.2 to 0.35 percent of polycarboxylate superplasticizer and 0.8 to 1.2 percent of magnetic iron oxide coated SiO2 expanding agent. According to the invention, the active inhibition that the crack width is less than or equal to 0.05 mm is realized through the shrinkage compensation of the magnetic field oriented expanding agent, the temperature-sensitive fiber phase change toughening and the photochromism-microorganism synergistic repair.

The invention discloses a multifunctional polycarboxylate superplasticizer as well as a preparation method and application thereof, and belongs to the technical field of concrete admixtures, through the design of a macromolecular structure, different compounds containing quaternary ammonium salt cations and chitosan structures, polyether, unsaturated carboxylic acid and derivatives thereof are subjected to free radical copolymerization, and the multifunctional polycarboxylate superplasticizer is prepared. The polycarboxylate superplasticizer containing quaternary ammonium salt cations and a chitosan structure at the same time is synthesized. The slump loss resistance and mud resistance of the water reducing agent are better due to quaternary ammonium salt cations in the water reducing agent, the water reducing agent has good adaptability in different types of cement, meanwhile, the water reducing agent has low sensitivity to clay, the viscosity reduction effect is further improved due to a large number of hydrophobic groups contained in chitosan, and polycarboxylic acid molecules have better extensibility due to the adoption of a structure with smaller molecular weight; the thickness of a water layer film formed by polycarboxylic acid molecules with short side chains in concrete is lower, so that more free water is released to reduce the viscosity of the concrete, the synthesis process is simple, the reaction is efficient, and wide application prospects are achieved.

The invention discloses a high-performance cement-based micro-expansion filling grouting material and a preparation method thereof, and belongs to the technical field of inorganic cementing materials. The high-performance cement-based micro-expansion filling grouting material is prepared from Portland cement, fly ash, graded aggregate, aluminum silicate coated aluminum powder, calcium silicate coated magnesium oxide, tung oil coated iron powder, a calcium formate early strength agent, polycarboxylate superplasticizer powder and water. According to the obtained high-performance cement-based micro-expansion filling grouting material, the fluidity ranges from 432 mm to 441 mm, the 28-day compressive strength ranges from 63.5 MPa to 65.2 MPa, the 28-day breaking strength ranges from 14.3 MPa to 15.1 MPa, the 28-day shrinkage rate ranges from 0.01% to 0.04%, and the 10-time freezing and thawing expansion rate ranges from 0.03% to 0.06%.

The invention relates to a mud-resistant polycarboxylic acid water reducing agent and a preparation method thereof, and the mud-resistant polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 90-260 parts of allyl-terminated polyether monomer; 20 to 32 parts of unsaturated acid monomer; 8-15 parts of an unsaturated ester monomer; 4-8 parts of a quaternary ammonium salt compound; 1.5 to 3.0 parts of an oxidizing agent; 0.2 to 0.4 part of a reducing agent; 0.8 to 1.5 parts of a chain transfer agent; and water; wherein the allyl-terminated polyether monomer is prepared from the following raw materials: unsaturated alcohol, an allyl compound and a basic catalyst. The polycarboxylate superplasticizer prepared by the method disclosed by the invention has the advantages of low mixing amount, high water reduction, good workability, low mixing amount sensitivity, excellent mud resistance, capability of remarkably improving the dispersion and adsorption performance of concrete, wide application range of mud content in sand and gravel materials and the like.

The invention discloses high-strength durable pervious concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from the following raw materials in parts by weight: 160 to 220 parts of cement, 1200 to 1600 parts of coarse aggregate, 170 to 230 parts of fine sand, 160 to 200 parts of water, 3 to 4.5 parts of polycarboxylate superplasticizer, 5 to 15 parts of silica fume, 1 to 3 parts of polypropylene fiber, 8 to 12 parts of modified nano cellulose and 5 to 7 parts of flexibilizer, wherein the flexibilizer comprises modified graphene oxide, propylene glycol monomethyl ether and polyisoprene rubber. The interface compatibility is enhanced through the modified nanocellulose, microcracks are reduced, the bonding strength of aggregate and cement is improved, and the compressive strength is improved; the toughening agent component endows the concrete with toughness and durability, the toughening agent component and the toughening agent component have a synergistic effect, and the concrete prepared by mixing the various raw materials has excellent mechanical properties and durability on the basis of good water permeability, and has a wide market application prospect.

The invention discloses a shield synchronous grouting admixture, a shield synchronous grouting material and a preparation method of the shield synchronous grouting material, and the shield synchronous grouting admixture comprises the following components in percentage by mass: 1-2% of a polycarboxylate superplasticizer, 1-2% of an expanding agent, 12-18% of polyacrylamide, 15-20% of sodium silicate and the balance of fly ash. The shield synchronous grouting material comprises slurry powder, and the slurry powder is composed of, by mass, 10%-15% of cement, 20%-30% of fly ash and 40%-60% of machine-made sand; a shield synchronous grouting admixture, wherein the mass of the shield synchronous grouting admixture is 0.5%-2% of the mass of the slurry powder; the mass of the mixing water is 20%-30% of the total mass of the slurry powder and the shield synchronous grouting admixture. According to the shield synchronous grouting material provided by the invention, the independently researched and developed grouting admixture is adopted to replace traditional bentonite, and the key performance of the shield synchronous grouting material is comprehensively optimized by finely adjusting the ratio of the shield synchronous grouting admixture to the cement, the coal ash, the machine-made sand and the mixing water.

A method of preparation of a foamed concrete, comprising the steps of; providing a cementitious slurry, comprising in wt% relative to the wt of the slurry, 60-70% of a cementitious material, 0.5-5% in

The invention provides a viscosity reduction type concrete super plasticizer and a preparation method and application thereof.The super plasticizer is solid and is prepared from an unsaturated monomer a, an unsaturated monomer b and an unsaturated monomer c through free radical polymerization under the microwave condition, the unsaturated monomer a is methacrylic acid or methyl alkenyl phosphonic acid monomer, and the unsaturated monomer b is methacrylic acid or methyl alkenyl phosphonic acid monomer. The unsaturated monomer b is a monomer containing a rigid ring, the rigid ring is an aromatic ring or an imidazole ring or a pyridine ring, and the unsaturated monomer c is an unsaturated polyether monomer containing a benzene ring. A methyl group and a rigid ring group are introduced into a main chain of the super plasticizer, so that the rigidity of a polymer is improved, the hydrophobicity is increased, the conformation of the polymer is changed, and a relatively thick water film layer is formed on the surface of cement particles; meanwhile, a branched structure side chain is introduced into the super plasticizer, so that the molecular size of the polymer can be remarkably increased, the steric hindrance effect of the polymer is more outstanding, the dispersing capacity is good, the thickness of a water film layer on the surface of cement can be increased, and the viscosity of concrete is further reduced.

The invention relates to the technical field of fluid-state solidified soil, and particularly discloses high-fluid-state solidified soil and a preparation method thereof. The high-flow-state solidified soil is prepared from the following raw materials in parts by weight: 1100 to 1200 parts of recycled aggregate, 700 to 800 parts of river sand, 100 to 130 parts of a curing agent, 18 to 22 parts of a polycarboxylic acid water reducing agent, 75 to 85 parts of solidified soil repairing microcapsules and 55 to 95 parts of water, the solidified soil repairing microcapsule is prepared by taking polylactic acid and nano calcium carbonate grafted polyethylene glycol as composite membrane materials, and wrapping and forming sulphoaluminate cement paste through an emulsification-solidification method. The solidified soil repairing microcapsules are introduced into the solidified soil, pores in an interface transition area can be filled, micro cracks can be repaired, and the durability of the solidified soil is improved.

The invention relates to the technical field of building materials, in particular to all-solid waste alkali-activated recycled concrete and a preparation method thereof. The concrete is prepared from the following raw materials in parts by weight: 360 to 500 parts of blast furnace slag, 180 to 400 parts of recycled concrete, 90 to 270 parts of recycled red bricks, 40 to 90 parts of silica fume, 30 to 90 parts of phosphogypsum, 240 to 370 parts of iron tailing sand, 350 to 420 parts of recycled concrete coarse aggregate, 200 to 400 parts of alkali activator, 10 to 30 parts of polycarboxylate superplasticizer, 20 to 50 parts of sodium tetraborate decahydrate and 300 to 500 parts of water. According to the invention, through fine proportioning and functional synergy of all the components, a solution of all-solid waste concrete with excellent mechanical properties, durability, construction performance and economical efficiency is provided, and the concrete has a wide application prospect in the fields of green buildings and solid waste recycling.

The invention provides a polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete) and a preparation method thereof, the polycarboxylate superplasticizer for UHPC is prepared from the following components in parts by weight: 60 to 80 parts of polycarboxylate superplasticizer, 50 to 60 parts of viscosity reduction mother liquor, 0.05 to 0.12 part of defoaming agent, 2 to 5 parts of hydration temperature rise inhibitor, 5 to 8 parts of polymer emulsion, 0.01 to 0.05 part of air entraining agent and 100 to 120 parts of water. The polycarboxylate superplasticizer for UHPC is prepared from the specific components including the polycarboxylate superplasticizer, the viscosity reduction mother liquor, the defoaming agent, the hydration temperature rise inhibitor, the polymer emulsion, the air entraining agent and the like according to a certain ratio, has the effects of water reduction, viscosity reduction and shrinkage reduction through compounding, has an ultrahigh water-reducing rate, and can reduce the viscosity among the components of concrete and reduce the shrinkage while the strength of the concrete is not influenced; the comprehensive performance of the UHPC is effectively adjusted, the method is suitable for large-scale popularization and industrial production, remarkable environmental benefits and economic values are shown, and the method has positive significance in promoting sustainable development of the building industry.

The invention discloses a composite water reducing agent suitable for an ardealite-red mud-based cementing material and a preparation method thereof. The composite water reducing agent comprises a modified polycarboxylic acid water reducing agent, an ion complexing agent, an alcohol amine compound, an alcohol compound and the balance of a solvent. According to the modified polycarboxylate superplasticizer disclosed by the invention, a phosphate group, an amide group and a sulfonic group are introduced into the structure of the polycarboxylate superplasticizer as functional groups through a water solution free radical copolymerization method, and then are compounded with small molecular monomers such as an ion complexing agent and the like; the dispersing performance of the water reducing agent and the adaptability of the water reducing agent to an ardealite-slag-red mud system are further improved. The composite water reducing agent is suitable for the phosphogypsum-red mud based cementing material, and has the advantages of enhancing the dispersity of each component in a system, increasing the contact area of phosphogypsum and red mud particles with slag, promoting hydration of the cementing material, and improving the 3d, 7d and 28d strength of the cementing material.

The invention discloses a lithium slag based salt corrosion resistant concrete pole and a preparation method thereof. The pole is made of lithium slag based geopolymer concrete. The concrete comprises the following components in parts by mass: 20-30 parts of dealkalized red mud, 15-25 parts of activated lithium slag, 10-15 parts of slag, 5-8 parts of silica fume, 6-10 parts of magnesium phosphate cement, 12-18 parts of a composite alkali activator, 25-35 parts of machine-made sand, 40-50 parts of gravel, 0.4-0.6 part of a polycarboxylic acid water reducer, 0.8-1.2 parts of composite fibers, 2-3 parts of a salt corrosion-resistant corrosion inhibitor and 25-35 parts of water. The outer surface of the electric pole is coated with an organic silicon-fluorosilicone resin hydrophobic coating; the salt-corrosion-resistant corrosion inhibitor is prepared by compounding nano silicon dioxide, a hydrotalcite precursor and a triphosphonic acid-based corrosion inhibitor, the concrete pole is obtained through the processes of red mud and lithium slag pretreatment, raw material mixing, centrifugal forming, curing and surface treatment, and has excellent salt corrosion resistance and mechanical property.