387 results about "Superplasticizer" patented technology

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 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 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 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 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.

The present invention relates to a free-flowing powder composition comprising biochar as a carrier for admixture, especially a superplasticizer. The present invention also relates to the preparation method of such a free-flowing powder composition and its use for a mineral binder composition.

The invention relates to the technical field of concrete admixtures, in particular to a viscosity reduction type polycarboxylate superplasticizer and a preparation method thereof. The viscosity reduction type polycarboxylate superplasticizer is formed by polymerizing a comonomer under the action of an oxidizing agent, a reducing agent and a chain transfer agent, the comonomer comprises methoxyallyl polyoxyethylene ether, an air-entraining functional monomer, a viscosity-reducing functional monomer, a silicon-containing functional monomer, unsaturated acid and ferrous sulfate. The polycarboxylate superplasticizer provided by the invention can effectively reduce the viscosity of concrete, so that a concrete mixture has good flowability, workability and wrapping property, meanwhile, the strength of the concrete is not influenced as far as possible, the strength of the concrete is kept at a good level, and the concrete keeps good constructability. Moreover, when the viscosity-reducing polycarboxylate superplasticizer is prepared, the reaction can be completed at the normal pressure of 20-25 DEG C, the preparation steps are simple, the reaction condition is mild, no toxic gas is released, energy can be effectively saved, and the viscosity-reducing polycarboxylate superplasticizer meets the green building material standard.

The invention relates to the technical field of tailing concrete poles, in particular to a prestressed tailing concrete pole and a manufacturing method thereof, and the prestressed tailing concrete pole comprises the following components in parts by mass: 550-600 parts of modified iron tailings, 180-200 parts of a prestressed modifier, 500-600 parts of slag, 30-45 parts of silica fume, 180-200 parts of fly ash, 6-8 parts of a polycarboxylate superplasticizer, 5-10 parts of a viscosity modifier and 5-10 parts of an auxiliary enhancer. Through the synergistic effect of the prestress modifier, the viscosity modifier and the modified iron tailings, bleeding and segregation of the high-volume tailing concrete in the vibrating process are prevented, the homogeneity of the material is ensured, the formed electric pole has extremely high internal compactness and a smooth surface, and therefore the freeze-thaw resistance and durability of the electric pole are greatly improved. The modified iron tailings are used for replacing part of traditional cementing materials and aggregates, so that the production cost is remarkably reduced, extremely high additional value is given to industrial solid wastes, the problems of environmental risk and land occupation caused by stockpiling of the industrial solid wastes are solved, and the national green development strategy is met.

The invention discloses a polycarboxylate superplasticizer with a linear water-reducing rate as well as a preparation method and application of the polycarboxylate superplasticizer. The water reducing agent is prepared from a polyether macromonomer phosphating derivative, a carboxylic acid monomer, a sulfonic acid monomer, an ester slump retaining monomer, a linear regulation and control monomer and other units through a free radical emulsion polymerization process. Compared with a traditional polycarboxylic acid water reducer, the water reducer has more regular side chain arrangement, higher charge density, higher adsorption capacity and more stable dispersing performance, the water-reducing rate can be linearly increased along with the increase of the mixing amount within the effective mixing amount range, and the water-reducing efficiency is improved. The problem that the concrete fluidity is difficult to control due to nonlinear fluctuation of the water reducing rate of a traditional polycarboxylic acid water reducing agent is solved, and the method has important significance on improving the concrete construction stability and the engineering quality. The product provided by the invention has excellent mud resistance and slump loss resistance besides high linear water-reducing rate, is suitable for various cast-in-place and precast concrete projects, and has remarkable economic value and application prospect.

The invention discloses concrete with anti-freezing performance and a preparation method thereof, and belongs to the technical field of concrete. The invention aims to solve the problems that the porosity of an interface transition area is high, hydration products are easy to degrade and the anti-freezing and anti-permeation performances are insufficient under the working conditions of high altitude, low air pressure, strong ultraviolet rays and salt-freezing synergy of the existing large-dosage fly ash concrete. The concrete is prepared from the following components in parts by weight: 100 parts of cement, 100 to 150 parts of coal ash, 280 to 320 parts of fine aggregate, 1000 to 1200 parts of modified basalt coarse aggregate, 1.5 to 3.5 parts of polycarboxylic acid water reducing agent, 0.2 to 0.6 part of PEG (Polyethylene Glycol) coated chitosan quaternary ammonium salt microspheres, 0.05 to 0.25 part of chitosan grafted nano cerium oxide composite particles, 1.0 to 3.0 parts of bacillus pseudofirmus microcapsule-polyvinylpyrrolidone mixture and 0.03 to 0.12 part of trisodium citrate. Through the synergistic effect of all the components, the interface structure of the concrete is effectively optimized, the ultraviolet aging resistance, the salt-freezing synergistic damage resistance and the chloride ion infiltration resistance are improved, the high-altitude severe service condition is adapted, and reliable material support is provided for high-altitude infrastructure construction.

The invention relates to the technical field of building material preparation, and particularly discloses a preparation process of a low-temperature fluid curing agent and a stabilized soil building material thereof, and the preparation process comprises the following steps: (1) adding modified starch into water, uniformly stirring, and removing oxygen; then adding maleic anhydride and persulfate, and heating to react; and after the reaction is finished, adding ethanol, separating out the precipitate, and drying to obtain the CMSS-g-MA. (2) adding glycine betaine into water, uniformly stirring, then adding CMSS-g-MA, and heating to react; and carrying out spray drying on the obtained reaction liquid to obtain the modified betaine powder. And (3) taking sulphoaluminate cement, ordinary Portland cement, a polycarboxylate superplasticizer, a silane coupling agent, the modified betaine powder, hydroxyethyl cellulose and the like as raw materials, and uniformly mixing the raw materials to obtain the low-temperature fluid curing agent. The solidified soil slurry can be better prevented from being frozen in a low-temperature environment, the stability of the internal structure of the solidified soil is kept, and a guarantee is provided for low-temperature construction.

The invention relates to the technical field of conductive materials, and discloses ECC concrete based on carbon black doping and a preparation method and application thereof.The preparation method includes the following steps that cement, slag, quartz sand, silica fume and limestone powder are subjected to dry mixing to obtain a dry material; dispersing carbon black and a dispersing agent in water to obtain carbon black dispersion liquid; and mixing the dry material, the carbon black dispersion liquid, a polycarboxylate superplasticizer and polyethylene fibers to obtain the carbon black doped concrete. The conductivity of the ECC concrete is improved through the carbon black, the ECC concrete is applied to the field of friction nano-generators, potential difference can be formed through extrusion of an automobile in the using process, and therefore current is output to supply power to traffic lights, monitoring equipment and the like.

The invention discloses a lightweight heat-insulation cement-based composite material, and relates to the technical field of cement-based composite materials, the lightweight heat-insulation cement-based composite material comprises the following material components by weight: 40-60 parts of a cement matrix, 20-35 parts of a lightweight aggregate, 5-12 parts of a polymer modifier, and 0.5-0.3 part of a functional additive, the cement matrix is sulphoaluminate cement or Portland cement, and the functional additive is a water-based composite material. The lightweight aggregate comprises hollow glass beads with the particle size of 0.1-0.5 mm, expanded perlite with the particle size of 0.5-2 mm and surface modified aerogel particles, the aerogel particles are silicon dioxide aerogel or silicon carbide aerogel, the surface area of the aerogel particles is 700-600 m / g, the pore diameter of the aerogel particles is 40-50 nm, the polymer modifier is acrylate-styrene copolymer emulsion, and the particle size of the polymer modifier is 1-10 m / g. The solid content of the acrylate-styrene copolymer emulsion is 50-45%, the glass transition temperature of the acrylate-styrene copolymer emulsion is-10 DEG C to 15 DEG C, and the functional additive comprises a cellulose ether thickener, a polycarboxylate superplasticizer and a nano aluminum oxide dispersion liquid.

The invention belongs to the technical field of concrete, and particularly relates to porous concrete as well as a preparation method and application thereof. The porous concrete is prepared from the following raw materials in parts by mass: 100 parts of Portland cement, 5 to 15 parts of silica fume, 140 to 160 parts of gravel, 10 to 20 parts of steel slag, 30 to 50 parts of sand, 0.8 to 1.5 parts of polycarboxylic acid water reducing agent, 8 to 15 parts of mixed resin, 0.3 to 0.8 part of water repellent, 0.9 to 1.2 parts of modified polypropylene fiber and 45 to 60 parts of water. The porous concrete disclosed by the invention is high in compressive strength, good in water permeability and strong in durability, and is particularly suitable for road engineering in high and cold, high-humidity and heavy traffic areas in China.

The invention discloses a tensile and anti-crack concrete pole, which belongs to the technical field of concrete materials and comprises the following components in proportion: 380-450 kg / m < 3 > of cement, 20-40 kg / m < 3 > of silica fume, 50-80 kg / m < 3 > of fly ash, 1000-1150 kg / m < 3 > of broken stone, 650-750 kg / m < 3 > of sand, 0.5-1.5 kg / m < 3 > of synthetic fiber, 30-80 kg / m < 3 > of steel fiber, 130-160 kg / m < 3 > of water, 25-40 kg / m < 3 > of expanding agent and 4.5-7.5 kg / m < 3 > of multi-branched temperature-sensitive polycarboxylic acid superplasticizer. The multi-branched temperature-sensitive polycarboxylic acid high-efficiency water reducing agent is prepared by co-polymerizing a multi-branched chain transfer agent, a temperature-sensitive polymerizable monomer, acrylic acid and polyethylene glycol monomethyl ether acrylate, and has the advantages of excellent dispersion effect, high-temperature slump retaining property, few pores of an electric pole, high compactness and better tensile and anti-cracking properties.

The invention belongs to the technical field of building materials, and discloses a concrete composite additive and a preparation method thereof. The additive comprises a polycarboxylate superplasticizer, nano silicon dioxide, modified starch ether, bentonite, a calcium sulphoaluminate activator, a bio-based antirust agent and a graphene oxide dispersion liquid. Through a step-by-step mixing process, liquid phase dispersion is performed firstly, then solid phase gradient mixing is performed, and ultrasonic treatment and low-temperature drying are combined, so that the problem of multi-component interface compatibility and activity retention is solved. The obtained additive can synergistically improve the anti-cracking and anti-rust performance of concrete, significantly reduce chloride ion penetration and prolong the durability period. And the preparation method is environment-friendly, efficient and suitable for high-durability concrete engineering.

The invention relates to the technical field of concrete, in particular to a high-bending-resistance road concrete material and a preparation method thereof.The high-bending-resistance road concrete material is prepared from, by weight, 100 parts of aluminate cement, 6-8 parts of filler, 1-1.4 parts of additive, 350-400 parts of basalt coarse aggregate, 200-250 parts of medium sand, 33-37 parts of mixing water and 0.7-0.9 part of polycarboxylate superplasticizer. In the invention, the additive powder modified by the composite solution is mixed with the mineral powder activated by the premixed solution to form a filler with a microporous structure and rich surface functional groups, the microporous structure can internally maintain moisture, so that cement is fully hydrated and pores are refined, and the functional groups can generate a synergistic effect with cement ions and fibers in the additive, so that the cement can be fully hydrated. Cracks are not easy to expand when the interior of a concrete matrix bears bending stress, and fibers in the additives inhibit crack expansion through a bridging effect, so that the fracture resistance of the road concrete material is also improved.

The application discloses a kind of anti-freezing concrete and preparation method of multi-generation recycling, the concrete is by following raw material is formed according to weight parts: cement 405~418 parts, nano silicon dioxide 8~20 parts, river sand 680~735 parts, recycled coarse aggregate 865~890 parts, water 168~194 parts, polycarboxylate superplasticizer 2.2 parts and alkyl benzene sulfonate air entraining agent 0.05~0.1 parts.The application uses nano silicon dioxide as raw material, which has high specific surface area and pozzolanic activity, and the alkyl benzene sulfonate air entraining agent reduces the aggregation of nano silicon dioxide, not only promotes its uniform dispersion in concrete, but also makes the pore distribution in concrete uniform, thereby improving the mechanical properties and frost resistance of concrete, and the second generation and third generation recycled coarse aggregate obtained by crushing after 400 freeze-thaw cycles can be used in structural concrete in cold regions, greatly reducing material waste and environmental pollution.

The application relates to the technical field of building material preparation, and particularly discloses a preparation process of a low-temperature flow-state curing agent and a cured soil building material, which comprises the following steps: (1) adding modified starch into water, stirring until uniform, and then removing oxygen; then adding maleic anhydride and persulfate for heating reaction; after the reaction is completed, adding ethanol, separating out precipitates, and drying to obtain CMSS-g-MA; (2) adding glycine betaine into water, stirring until uniform, then adding CMSS-g-MA for heating reaction; after the reaction is completed, performing spray drying on the obtained reaction liquid to obtain modified betaine powder; and (3) taking sulphoaluminate cement, ordinary Portland cement, polycarboxylate superplasticizer, silane coupling agent, the modified betaine powder and hydroxyethyl cellulose as raw materials, mixing the raw materials until uniform, and then obtaining a low-temperature flow-state curing agent. The application can better avoid the freezing of a cured soil slurry in a low-temperature environment, maintain the stability of the internal structure of the cured soil, and provide guarantee for low-temperature construction.

A coal-based solid waste regenerated aggregate shotcrete and a preparation method thereof, comprising cementitious material 100 parts, coarse aggregate 150-200 parts, fine aggregate 150-200 parts, polycarboxylate superplasticizer 2-4 parts, anti-adsorption agent 0.5-1.5 parts, water 35-60 parts, and defoaming agent 0.1-0.3 parts. The cementitious material is composed of cement and waste desulfurization gypsum; the coarse and fine aggregates are all coal gangue or gasification slag; the polycarboxylate superplasticizer is a slow-release polycarboxylate superplasticizer containing phosphate ester groups in the side chain; and the anti-adsorption agent is bentonite modified by a silane coupling agent. The modified bentonite anti-adsorption agent preferentially blocks the porous surface adsorption sites of the coal-based solid waste aggregate, and the slow-release polycarboxylate superplasticizer continuously provides dispersion force, effectively reduces the invalid consumption of the superplasticizer, significantly reduces the 1h slump loss rate of the concrete, reduces the rebound rate of the shotcrete construction to below 15%, and the total solid waste content is above 70%, realizing large-scale collaborative utilization of coal-based solid waste and waste desulfurization gypsum.

This invention discloses a lithium slag dealkalization treatment agent and a method for the resource utilization of lithium slag in building materials, comprising the following raw materials in parts by weight: 50-80 parts sodium hydroxide, 30-50 parts water glass, 5-15 parts polycarboxylate superplasticizer, and 10-20 parts calcium carbonate. This invention has the advantage of being environmentally friendly and solves the problems of existing lithium slag resource utilization methods, such as the inconvenience of preparing high-strength, high-insulation building materials from waste lithium slag, insufficient strength of lithium slag building materials making them unsuitable for load-bearing structures or high-load scenarios, limiting their use to low-strength filler materials or non-structural components, significantly reducing their economic value, and poor insulation performance failing to meet energy-saving building standards, resulting in a lack of competitiveness in scenarios requiring thermal insulation such as walls or roofs.

The present application relates to a kind of technology for inducing marine sessile organism attachment, especially a kind of fiber reinforced ecological concrete and preparation method, belong to the cross field of marine sessile organism and marine concrete.Its material components include: cementitious material, broken stone, sand, water, dark pigment, biological calcium powder, calcium carbonate powder, trace element, chopped fiber and superplasticizer.The purpose of the present application is to induce sessile organism attachment, mainly oyster, in the tidal zone reinforced concrete corrosion prevention, considering the attachment of barnacle.By controlling to use dilute acid modification and composite grinding technology, the inducing capacity of bovine bone powder is fully exerted, the bovine bone powder content is greatly reduced, and corrosion prevention treatment and modification are carried out, a composite inducer mainly composed of bovine bone powder is realized, the content is small, and the concrete strength and permeability are almost not affected.

The invention relates to the technical field of polycarboxylate superplasticizer modification, in particular to a method for modifying a polycarboxylate superplasticizer through Ti-SiO2 porous microspheres, the modified polycarboxylate superplasticizer and application. The polycarboxylate superplasticizer is modified by adopting the nano Ti-SiO2 porous microspheres, and the modified polycarboxylate superplasticizer effectively reduces the liquid level tension of slurry, increases the spacing of cement particles and releases more free water, so that the viscosity reduction performance of cement slurry is improved, the mechanical property and durability of a hardened cement material are improved, and the strength of concrete is enhanced. The modified polycarboxylate superplasticizer prepared by adopting the method for modifying the polycarboxylate superplasticizer by adopting the nano Ti-SiO2 porous microspheres, provided by the invention, has relatively high water-reducing rate and relatively good workability and viscosity reduction performance, and the mechanical strength and durability are improved.

The invention discloses alkali-activated gypsum glass particle concrete and a preparation method thereof, and belongs to the technical field of building materials. The invention aims to solve the technical problems of poor interface cohesiveness and stockpiling pollution of industrial byproduct gypsum caused by the use of inert aggregate in traditional alkali-activated gypsum concrete. The concrete is prepared from the following raw materials in parts by weight: 10-15 parts of an alkali activator, 30-40 parts of dehydrated gypsum and 50-60 parts of tempered glass particles. In addition, the concrete further comprises a polycarboxylate superplasticizer and a protein gypsum retarder, and the addition amounts of the polycarboxylate superplasticizer and the protein gypsum retarder are respectively determined based on the total mass of the main body material and the mass of the dehydrated gypsum. The core of the invention is that the active aggregate formed by crushing the waste toughened glass is utilized, and amorphous silicon dioxide rich in the active aggregate can react in an alkali excitation environment to generate CSH gel, so that an interface transition region between the aggregate and a rubber material is remarkably reinforced, and the mechanical property of the concrete is improved. Meanwhile, industrial by-product gypsum such as ardealite and the like can be used, and high-added-value resource utilization of the solid waste is achieved.

The invention discloses an anti-cracking pouring fine aggregate concrete slab and a preparation method thereof, and belongs to the technical field of concrete production. The concrete slab comprises the following components: cement, stones, machine-made sand, a mineral admixture, a polycarboxylate superplasticizer, a maleic anhydride-hydroxypropyl acrylate copolymer and polyoxyethylene. Wherein the maleic anhydride-hydroxypropyl acrylate copolymer is prepared through free radical polymerization, a blocking layer is formed by combining cement particles and other components, the effects of dispersion, water retention and shrinkage reduction are achieved, stress is relieved through polyoxyethylene, pores are refined, the cracking problem of a fine aggregate concrete plate is effectively solved, and the crack resistance and strength of the prepared concrete are improved.

The invention relates to a preparation method of a superfine early-strength mineral admixture based on solid waste reutilization, and belongs to the technical field of solid waste reutilization. The admixture is prepared by the following steps: performing multi-stage ultrafine grinding on mineral slag, steel slag, raw fly ash and manganese slag to prepare solid waste powder, and adding composite excitants Na2SiO3, AlCl3. 6H2O, citric acid, CaCl2. 2H2O and a UEA expanding agent, and dispersing agents polycarboxylate superplasticizer and nano SiO2. The high-activity early strength, low-shrinkage crack resistance and high solid waste utilization rate of the admixture are realized through solid waste synergistic activation, multi-stage grinding particle composition optimization and excitation-dispersion synergistic effect.

The invention provides a double-repairing-material composite system for self-repairing internal and external cracks of concrete, which comprises an internally doped composite dry powder repairing agent and an externally coated intelligent repairing liquid, the internal doping type composite dry powder repairing agent comprises high-activity modified silicate, silica fume, a composite catalyst, a calcium sulphoaluminate expanding agent, a magnesium oxide expanding agent, epoxy resin microcapsules, surface modified polypropylene fibers, a microbial carrier, a polycarboxylate superplasticizer, a dispersing agent and filler. The external coating type intelligent repairing liquid comprises an alkyl alkoxy silane mixture, a waterborne epoxy-acrylic acid hybrid emulsion, a latent curing agent, superfine core powder, nano silicon dioxide dispersion liquid, nano calcium carbonate, colored active mineral powder, a wetting agent, a defoaming agent, a flatting agent, a mildew preventive and water. Related preparation methods and uses are also provided. The double-repairing-material composite system is easy and convenient to use, can achieve multiple triggering and synergistic effect, can repair internal and external cracks at the same time, and is good in repairing effect.

Disclosed are a viscosity-reducing polycarboxylic superplasticizer and a preparation method therefor. The viscosity-reducing polycarboxylic superplasticizer is obtained by compounding a macromolecular polymer and a pre-wrapped small-molecule polymer in a weight ratio of 1.7-2.3 : 1, wherein the molecular weight of the macromolecular polymer is between 75,000-85,000; and the pre-wrapped small-molecule polymer comprises a small-molecule polymer, a thickening agent and water in a weight ratio of 1,000 : 0.7-1.3 : 8-10, with the molecular weight of the small-molecule polymer being between 14,000-16,000. The polycarboxylic superplasticizer is prepared by compounding the macromolecular polymer and the small-molecule polymer in a certain proportion, thereby exerting a linked viscosity reduction effect, effectively reducing the slurry viscosity of high-performance concrete, improving the adaptability of a concrete admixture, and solving the problem of the site construction of high-performance concrete being difficult.

The invention belongs to the technical field of concrete, and discloses an anti-mud viscosity reduction type polycarboxylic acid water reducer as well as a preparation method and application thereof. The anti-mud viscosity reduction type polycarboxylic acid water reducer is prepared from the following raw materials in parts by weight: 150 to 300 parts of polyether monomer, 25 to 50 parts of unsaturated monomer, 5 to 15 parts of functional monomer, 3 to 8 parts of temperature-sensitive monomer, 0.8 to 1.5 parts of chain transfer agent, 0.5 to 5 parts of oxidant and 0.1 to 0.5 part of reducing agent. The functional monomer is a zwitterionic hybrid monomer with a boric acid group and a betaine group. According to the invention, the zwitterionic hybrid monomer with a boric acid group and a betaine group is added into the water reducing agent as a functional monomer, and N-isopropylacrylamide is added as a temperature-sensitive monomer, so that the mud resistance and viscosity reduction performance of the water reducing agent are realized.

The invention relates to the technical field of concrete admixtures, and particularly discloses a rapid dispersing type polycarboxylate superplasticizer and a preparation method thereof.The rapid dispersing type polycarboxylate superplasticizer is prepared from, by mass, 200-300 parts of polyether monomer, 1.5-3.5 parts of oxidizing agent, 0.2-0.5 part of reducing agent, 1.2-3 parts of chain transfer agent, 25-33 parts of unsaturated acid, 10-20 parts of self-made functional monomer modified alkyl glycoside, 5-10 parts of aconitic acid and 250-300 parts of tap water. The preparation method comprises the following steps: dissolving, preparing a solution A, preparing a solution B and synthesizing to prepare the quick dispersing type polycarboxylic acid water reducing agent. By introducing alkyl glycoside, wetting of cement particles is promoted, water-cement interfacial tension is rapidly reduced, meanwhile, cement particle aggregation is hindered through stereoisomerization of alkyl glycoside, the effect of rapid dispersion of cement particles is achieved, and modified alkyl glycoside provides adsorption points and electrostatic repulsion of cement particles to hinder cement particle aggregation, so that the cement particles are dispersed rapidly. The cement particles can be quickly dispersed in a low-temperature environment.