1272 results about "Portland cement" 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 relates to the technical field of cement-based soil curing agents, and particularly discloses a roadbed soil cement cementing material curing agent and a use method thereof. The curing agent comprises Portland cement, coal gangue particles, fly ash, silica fume, an anti-permeability reinforcing agent, a water reducing agent and fibers. The anti-permeability reinforcing agent is prepared by the following steps: (1) dispersing polyaluminum sulfate powder into absolute ethyl alcohol, then adding a silane coupling agent and a water repellent agent, and heating and preserving heat under a stirring condition; and then separating out solids to obtain the modified polyaluminum sulfate. And (2) adding the modified polyaluminum sulfate into water, heating and preserving heat under a stirring condition, drying by distillation to remove water, and grinding the obtained solid product. The curing agent provided by the invention not only reduces the adverse effect of acid soil on the stability of a formed soil consolidated body, but also improves the impermeability and the durability of the soil consolidated body.

The invention relates to the technical field of biological induction of calcium carbonate deposition, in particular to self-repairing concrete for biological induction of calcium carbonate deposition and a preparation method thereof. The cement comprises the following components in parts by weight: 320-380 parts of Portland cement and the like. The biomineralization composite inducer contains a genetically engineered bacterium solution, a urea-calcium chloride solution and a nano strontium carbonate seed crystal; the nano silicon dioxide-graphene composite powder is prepared by chemical vapor deposition; the wall material of the double-response microcapsule contains a temperature-sensitive polymer, and the core material contains a plurality of components; nanocellulose whiskers are also added; self-repairing is achieved through cooperation of multiple components, and all the components are specially treated or prepared. The self-repairing concrete is high in self-repairing efficiency, and wide cracks can be repaired; the mechanical property is excellent, and the compression strength and the breaking strength are remarkably improved; working performance is good, and construction is convenient; durability is good, and erosion and permeability are resisted; environmental protection and economy are considered, and the application prospect is wide.

The invention belongs to the technical field of new building materials, and provides a low-alkalinity and early-strength ardealite filling and curing material and a preparation method thereof.The low-alkalinity and early-strength ardealite filling and curing material is prepared from ardealite, a curing agent and water, the curing agent comprises silica fume, limestone powder, superfine granulated blast furnace slag powder, metakaolin, calcium aluminate powder, Portland cement clinker powder, a suspension stabilizer and hydroxypropyl methyl cellulose ether. The problems of delayed coagulation, low early strength and high alkalinity of a common cement-based ardealite filling material can be solved, and the technical requirements of ardealite cemented filling are met.

The invention discloses a light telegraph pole cement material and a preparation method thereof, and relates to the technical field of cement concrete. The method comprises the following steps: firstly, carrying out acid pickling, silane coupling agent grafting and nanoparticle vacuum impregnation treatment on shale ceramsite to obtain modified light ceramsite; the preparation method comprises the following steps: ultrasonically dispersing graphene oxide, compounding with Portland cement clinker and modified fly ash, and reacting with epoxy resin emulsion, a curing agent and a silane coupling agent to prepare organic-inorganic composite modified cement; the bamboo skeleton is subjected to silane coupling agent pretreatment to obtain a modified skeleton; then, mixing composite cement, an additive and water into slurry, adding the modified ceramsite and aggregate, and performing high-speed stirring and ultrasonic dispersion to form homogeneous concrete slurry; and finally, putting the modified bamboo skeleton into a mold, injecting the slurry, and performing centrifugal forming, steam curing and natural curing to obtain the cement material. The prepared lightweight telegraph pole cement material has excellent mechanical strength.

The invention belongs to the field of grouting materials, and discloses a composite grouting material as well as a preparation method, a construction method and application thereof. The composite grouting material comprises the following components: sulphoaluminate cement clinker powder, Portland cement clinker powder, a reinforcing agent, a coagulant and a modifier, the reinforcing agent comprises superfine mineral powder, superfine fly ash, silica fume and calcium sulfate whiskers; the coagulant comprises alumina clinker powder, calcium hydroxide, lithium carbonate and aluminum hydroxide; the modifier comprises a shrinkage reducing agent, a thickening agent, a water reducing agent and a retarder. The composite grouting material has the advantages of being good in pumpability, short in gelation time, free of plastic shrinkage, high in early strength, good in volume stability, high in durability, appropriate in price, environmentally friendly, free of toxicity and the like, and the requirement for rapid grouting maintenance is met in the subway operation window period.

The invention relates to the technical field of cement mortar compositions, and particularly discloses a double-component anti-freezing early-strength slurry and a preparation method and application thereof. The double-component anti-freezing early-strength slurry provided by the invention is composed of a component A and a component B in a weight ratio of 25: (4-10), the component A is prepared from the following components in parts by weight: 250 to 280 parts of Portland cement, 90 to 100 parts of admixture, 145 to 165 parts of sand and 6.4 to 8.4 parts of water reducing agent; and the component B comprises the following components in parts by weight: 8-10 parts of a sodium nitrite antifreeze agent, 50-58 parts of a reinforcing aid, 32-40 parts of anhydrite, 240-270 parts of an admixture, 155-175 parts of sand and 4.1-6.1 parts of a water reducing agent. By utilizing the technical scheme, the prepared double-component anti-freezing early-strength slurry has the advantages of rapid development of early compressive strength and stable growth of later compressive strength under different ultralow temperature conditions.

The invention relates to the technical field of self-thermal-insulation mortar, in particular to self-thermal-insulation mortar and a preparation method thereof. Comprising the following components: Portland cement, a gradient graphene aerogel skeleton, metal organic framework nanoparticles, photo-thermal-phase change coupling microcapsules, magnetic field orientation Fe3O4 nanosheets, self-repairing microcapsules, silicon carbide nanowire aerogel, a water reducing agent and a fiber reinforced material. The gradient graphene aerogel skeleton, the photo-thermal-phase change coupling microcapsules and other materials with excellent thermal insulation performance are introduced, and a multi-layer thermal insulation structure is constructed. The gradient graphene aerogel skeleton has extremely low heat conductivity coefficient and high porosity, and can effectively prevent heat transfer; the photo-thermal-phase change coupling microcapsules can absorb and release a large amount of heat in the phase change process, and the heat preservation effect of the mortar is further improved.

The invention relates to the field of concrete, and provides high-cracking-resistance concrete and a preparation method thereof.The concrete comprises a surface modified rubber fiber composition, surface modified end-hooked steel fibers, Portland cement, fly ash, silica fume, a superplasticizer, mineral powder, coarse aggregate, fine aggregate and water. The surface modified rubber fiber composition is composed of millimeter-sized and micron-sized rubber fibers, and is subjected to alkali treatment, oxidative sulfonation and amination modification, so that the cement compatibility and interface bonding force of the fibers are improved; the surface modified end-hooked steel fiber is subjected to dopamine hydrochloride auto-polymerization deposition and drying curing treatment, and the reinforcing effect is improved. The preparation method comprises the steps of fiber pretreatment, admixture mixing, aggregate dry mixing, slurry preparation, fiber uniform dispersion and concrete forming maintenance, and material uniformity and performance stability are ensured. By optimizing fiber modification and component proportion, the cracking resistance and durability of the concrete are improved, and the concrete is suitable for high-performance building structures and engineering application.

The invention discloses freeze-thaw resistant concrete and a preparation method thereof, and belongs to the technical field of cement-based building materials, the freeze-thaw resistant concrete comprises the following raw materials by mass: 35-40 parts of ordinary Portland cement, 100-180 parts of aggregate, 0.5-0.8 part of a water reducer, 4-6 parts of a phase change material, 2-5 parts of modified composite cellulose and 15-20 parts of water. According to the freeze-thaw resistant concrete prepared by the invention, polar groups on the surface of the modified fiber and the phase-change material form chemical bonds, so that the heat conduction efficiency is improved, the phase-change material quickly absorbs / releases heat during temperature change, the thermal response time is shortened, and the adaptability of a concrete structure to environmental temperature fluctuation is improved. The cellulose network with controllable porosity limits the volume expansion of the phase change material in the phase change process, so that the stress concentration in the concrete is avoided, and the generation of microcracks is reduced.

The invention provides weather-resistant anti-freezing road concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete comprises the following components: sulphoaluminate cement, Portland cement, silica fume, fly ash, modified granite gravel coarse aggregate, medium sand fine aggregate, silica fume blended fiber, silica fume blended polyacrylonitrile fiber, a composite air entraining agent, a functional modifier, a composite antifreeze agent, pre-absorbent zeolite powder and the like. The preparation method comprises the following steps: modifying granite macadam with Al (H2PO4) 3, SiO2 and methoxypolyethylene glycol triethoxysilane, and modifying with a lithium silicate aqueous solution to obtain the modified granite macadam coarse aggregate. The composite air entraining agent comprises a JRY-Q air entraining agent and sodium alpha-olefin sulfonate. The functional modifier is prepared from gas phase method spherical nano silicon dioxide and nano alpha-Al2O3. The composite antifreeze agent comprises ethylene glycol butyl ether acetate and modified calcium carbonate. The modified calcium carbonate is obtained by sequentially modifying nano calcium carbonate with calcium chloride, a KH-550 silane coupling agent and stearic acid.

The invention belongs to the technical field of concrete, and relates to high-strength anti-crack concrete and a preparation method thereof. The invention provides a preparation method of concrete. The preparation method comprises the following steps: preparing a modifier from tannic acid, starch and water; fibers are immersed in the modifier for modification to prepare modified fibers, and the modified fibers and basic concrete are mixed to prepare the concrete, the foundation concrete comprises ordinary Portland cement, coarse aggregate, fine aggregate and water. The technical problem that the anti-cracking capability of the concrete in a high-temperature dry environment is reduced when tannic acid is used for improving the strength of the foundation concrete is solved.

The invention provides a high-performance fiber-reinforced cement-based material and a preparation method thereof, and belongs to the technical field of building materials, the high-performance fiber-reinforced cement-based material comprises the following components by weight: 30-70% of ordinary Portland cement, 10-30% of pretreated solid waste incineration bottom ash, 0.5-2% of polypropylene fiber, 8-12% of water, and 0.5-1.5% of a water reducer; during preparation, the raw materials are weighed according to the proportion, a high-performance fiber-reinforced cement-based material sample is prepared through ultrasonic stirring, water adding stirring, fluidity adjusting, pouring vibrating and curing, the compressive strength of the prepared sample exceeds 30 MPa, the porosity is lower than that of a traditional material when the replacement rate of the pretreated solid waste incineration bottom ash is 5-10%, and the durability is remarkably improved; meanwhile, waste is effectively utilized, natural resource consumption and carbon emission are reduced, the curing efficiency of heavy metal ions in solid waste incineration bottom ash exceeds 98%, and double breakthrough of environmental protection and high performance is achieved.

The invention discloses an energy storage battery box based on light high-performance concrete and a preparation method of the energy storage battery box, and belongs to the technical field of energy storage equipment. The energy storage battery box provided by the invention comprises a light high-performance concrete base body and a metal net embedded in the light high-performance concrete base body, according to the lightweight high-performance concrete matrix, a multi-component gel system composed of ordinary Portland cement, a shrinkage reducing agent, a solid waste-based geopolymer and steel slag micro powder is adopted, and solid waste-based artificial sand, fibers and a solid waste-based filling material in a specific proportion are compounded, so that a lightweight high-strength intrinsically fireproof concrete material is successfully prepared; meanwhile, a large amount of industrial solid wastes such as the desulfurized gypsum, the red mud, the steel slag tailings and the fly ash are utilized, efficient resource utilization is achieved, the raw material cost and full-life-cycle carbon emission are remarkably reduced, and the production efficiency is high.

A system and method for amending out of specification ash to a suitable amended addition material to a concrete mixture includes analyzing a unit quantity of out of specification ash to determine concentrations of each of calcium oxide, sulfur trioxide, and unburnt carbon. The out of specification ash is sieved to determine fineness. Based upon measured concentrations and determined fineness, a mixture is designed to add materials in design-determined quantities of each of quicklime, kaolin, masonry silica blend, manufactured sand and in specification fly ash. By adding each of the quicklime, kaolin, masonry silica blend, manufactured sand and in specification fly ash in each of the design-determined quantities, creating an amalgamated blend of added materials to form an amended addition material. The amended addition material is substituted for a selected quantity of Portland cement in the concrete mixture.

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 belongs to the technical field of bottom plate mudstone treatment, and particularly relates to a rapid reinforcing material and method for bottom plate mudstone. The rapid reinforcing material for the bottom plate mudstone comprises the following components in parts by mass: a material A: 40-60 parts of sulphoaluminate cement, 15-40 parts of Portland cement and 1-2 parts of a naphthalene water reducer, and further comprises an initiator, a cross-linking agent and a redox agent; and a material B: 80-100 parts of gypsum, 10-30 parts of acrylamide and 2-4 parts of an aluminate coupling agent. According to the rapid reinforcing material for the bottom plate mudstone, the on-site argillization bottom plate can be hardened on site, a bottom plate hardening layer meeting the bearing condition is formed, the labor cost and the time cost caused by cleaning of bottom plate argillization substances are reduced, the passing smoothness is guaranteed, the project progress is accelerated, and the project benefits and the economic benefits are improved.

The invention discloses a concrete sewage pipeline antibacterial anticorrosive coating material and a preparation method thereof, the concrete sewage pipeline antibacterial anticorrosive coating material is prepared from the following raw materials: water, water supply aluminum sludge ash, a water reducing agent, Portland cement, aggregate and antibacterial agents, the antibacterial agents are three antibacterial agents with different representativeness, respectively zinc oxide ZnO, copper phthalocyanine C32H16CuN8 and dihexadecyl dimethyl ammonium bromide C34H72BrN. Compared with a traditional concrete anticorrosive coating material, the prepared antibacterial anticorrosive coating material for the sewage pipeline has the advantages that the water supply aluminum sludge ash modified cement-based material is used as a carrier, and the antibacterial agent is used as a functional component to be doped to prepare a functional antibacterial coating, so that the microbial corrosion resistance and the stability of the coating are remarkably improved, and the antibacterial anticorrosive coating material is green and environment-friendly, and has a good application prospect. The method is low in cost, simple in process and convenient to prepare.

The invention discloses a low-carbon high-strength cementing material and a preparation method thereof. The low-carbon high-strength cementing material is prepared from the following raw materials in parts by weight: 50-80 parts of industrial waste residues, 5-15 parts of an active exciting agent, 2-8 parts of reinforced fibers, 1-5 parts of a nano modified material and 1-3 parts of an auxiliary additive. According to the low-carbon high-strength cementing material and the preparation method thereof, industrial waste residues are used as main raw materials, exploitation and consumption of natural resources are reduced, and meanwhile emission of greenhouse gases such as carbon dioxide is reduced. Compared with the traditional Portland cement, the carbon emission of the cementing material disclosed by the invention can be reduced by more than 50%. Through the reasonable formula design and the synergistic effect of the raw materials, a test piece prepared from the cementing material has excellent mechanical properties. The 28-day compressive strength can reach 60-80 MPa, the tensile strength can reach 5-8 MPa, and the requirements of various high-strength constructional engineering can be met.

The invention discloses a high-crack-resistance self-repairing sprayed concrete composition as well as a preparation method and application thereof. The composition comprises the following components in percentage by mass: 40%-50% of cement, 50%-60% of aggregate, 1%-2% of composite microfibers, 3%-5% of modified polymer emulsion, 1%-2% of an additive, 0.5%-1.5% of a nano reinforced phase and 2%-3% of a self-repairing microcapsule, and also comprises an anti-corrosion additive. The composite microfiber is a mixture of polypropylene and basalt microfiber, and the nano reinforced phase is a compound system of nano calcium carbonate and silicon dioxide. The preparation method comprises the steps of aggregate pretreatment, dry material mixing, wet material preparation, microcapsule introduction and injection molding, the aggregate is pretreated through a silane coupling agent, the cement is formed by compounding ordinary Portland cement and aluminate cement, and the modified polymer emulsion is modified through a siloxane monomer. According to the composition, through the synergistic effect of the composite microfibers, the self-repairing microcapsules and the nano reinforced phase, the crack resistance and the self-repairing capacity are improved, the composition is particularly suitable for a corrosive environment, and the service life of a structure can be prolonged.

The invention relates to the technical field of mortar, in particular to cement self-leveling anti-crack and anti-seepage mortar and a preparation method thereof. The cement self-leveling anti-cracking and anti-seepage mortar is prepared from the following raw materials in parts by mass: 50 to 70 parts of Portland cement, 70 to 90 parts of quartz sand, 5 to 10 parts of nano metakaolin, 1 to 3 parts of calcium sulfate, 5 to 10 parts of polyethylene fiber, 1 to 2 parts of nonionic surfactant, 1 to 2 parts of silane coupling agent, 3 to 8 parts of composite basalt fiber, 0.5 to 1.5 parts of polycarboxylate superplasticizer and 1 to 3 parts of defoaming agent. 1-3 parts of hydroxypropyl methyl cellulose, 1-2 parts of a retarder and 0.5-1.5 parts of a coagulant. The mortar material has good anti-cracking performance and anti-seepage performance and excellent durability, can effectively solve the problem that the anti-cracking performance and the anti-seepage performance of the mortar material in the prior art cannot meet the environmental requirements, and is suitable for large-scale popularization and application.

The invention relates to a comprehensive method for controlling non-stress cracks of a long concrete wall structure. The comprehensive method comprises the steps that S1, a construction flow section is divided; s2, low-early-stage elastic modulus concrete is poured at the bottom of the long wall to form a concrete transition layer, so that constraint on wall body concrete is reduced; s3, low-hydration-heat concrete is poured, and the temperature of the concrete entering a mold is controlled, so that upper concrete is formed; the low-early-stage elastic modulus concrete poured in the step S2 has the same strength grade as the low-hydration-heat concrete poured in the step S3, but the elastic modulus does not exceed 50% of the upper concrete poured at the same time within 48-72 h and does not exceed 70% in 7 d, the elastic modulus in 28 d is 90%-110% of the elastic modulus of the upper concrete, and the elastic modulus in 28 d is 90%-110% of the elastic modulus of the lower concrete. The low-hydration-heat concrete poured in the step S3 is prepared from moderate-heat cement or low-heat cement or by doping 35%-55% of fly ash into ordinary Portland cement, and the adiabatic temperature rise of the low-hydration-heat concrete is controlled to be not larger than 35 DEG C.

The invention belongs to the technical field of nanocrystal nucleus early strength agents, and provides a damp and hot nanocrystal nucleus early strength agent, a tailing solidification filling material and a preparation method and application of the damp and hot nanocrystal nucleus early strength agent and the tailing solidification filling material. The invention discloses a molybdenum ore tailing slurry which is prepared from the following raw materials in parts by weight: 1 part of Portland cement, 4 to 6 parts of molybdenum ore tailings, 0.06 to 0.1 part of zeolite powder, 0.07 to 0.1 part of nanoscale attapulgite powder, 0.06 to 0.1 part of gamma-glycidyl ether oxypropyl trimethoxy silane, 0.03 to 0.1 part of potassium silicate, 0.04 to 0.1 part of sodium hydroxide, 0.06 to 0.1 part of calcium formate, 0.04 to 0.1 part of lithium metaaluminate and 1.25 to 1.75 parts of water. According to the technical scheme, the problem that a filling body prepared from an early strength agent in the prior art is low in early and later strength is solved, and meanwhile, the early strength agent is simple and convenient in preparation mode, low in cost and wide in application range.

The invention belongs to the technical field of building materials, and discloses an early-strength polymer modified cement-based grouting material and a preparation method thereof. The grouting material disclosed by the invention is prepared from the following raw materials in parts by weight: 100 to 115 parts of a cementing material, 100 to 115 parts of river sand, 20 to 23 parts of water, 2 to 2.5 parts of a water reducing agent, 0.02 to 0.04 part of an expanding agent, 0.22 to 1.76 parts of an acrylic emulsion and 0.04 to 0.08 part of a de-foaming agent, wherein the cementing material comprises 71-81 parts of Portland cement, 9-19 parts of sulphoaluminate cement, 6-8 parts of silica fume and 11-15 parts of fly ash microbeads. The early-strength, high-strength and high-fluidity cement-based grouting material can be obtained under the conventional curing condition by adopting the combined action of the acrylic emulsion polymer, the Portland cement and the sulphoaluminate cement, the plastic expanding agent, the polycarboxylate superplasticizer and the defoaming agent, and has good economic benefits and practical values.

The invention relates to the technical field of building materials, and discloses cement containing sulfonic acid cellulose and a preparation method thereof.The preparation method includes the steps that gypsum, coal gangue and Portland cement clinker are smashed and added into a concrete mixer to be stirred, then sulfonic acid cellulose, kieselguhr, calcium formate and quaternary ammonium salt modified polyurethane are added into the concrete mixer to be stirred, and the cement containing sulfonic acid cellulose is obtained; the cement containing the sulfonic acid cellulose is obtained. The cement containing sulfonic acid cellulose provided by the invention has better crack resistance, durability and good mechanical properties.

The invention discloses a high-strength quick-setting 3D printing concrete material based on nanocrystalline nucleus synergistic excitation and a forming preparation method thereof, and belongs to the technical field of building materials. The high-strength quick-setting 3D printing concrete material based on nanocrystalline nucleus synergistic excitation is prepared from the following components in parts by weight: 40 to 50 parts of phosphogypsum, 20 to 30 parts of Portland cement, 5 to 15 parts of sulphoaluminate cement, 1 to 5 parts of nanocrystalline nucleus agent, 0.5 to 1 part of carbon nanotube, 20 to 40 parts of phosphogypsum lightweight aggregate, 1 to 3 parts of additive, 1 to 3 parts of steel fiber and 0.1 to 0.3 part of hydroxypropyl methyl cellulose. According to the invention, by introducing a nano crystal nucleus synergistic excitation technology and combining with a 3D printing process, high performance of the phosphogypsum-based concrete material is realized, and a new material solution is provided for sustainable development of the building field.

The present invention relates to an activator for cementless binders comprising: a silicate of an alkali metal or alkaline earth metal or a hydrate thereof; a carbonate of an alkali metal or alkaline earth metal or a hydrate thereof; and a hydroxide of an alkali metal or alkaline earth metal or a hydrate thereof. The invention also relates to a cementless binder comprising said activator and to a cementless cementitious material comprising said cementless binder. Compared with the traditional ordinary Portland cement, the building material containing the cement-based cementing material has better compressive strength and has the characteristic of environmental protection.

The invention relates to the technical field of building materials, and particularly discloses a bridge expansion joint cement-based repairing mortar material and a preparation process thereof. The invention discloses a cement-based repair mortar material for bridge expansion joints. The cement-based repair mortar material is prepared from the following raw materials in parts by weight: 20-30 parts of Portland cement, 1-5 parts of benzoxazine resin, 30-40 parts of sandstone, 0.5-2 parts of nano silicon dioxide, 0.5-2 parts of a water reducing agent, 1-3 parts of hydrated calcium silicate, 15-25 parts of water and 10-15 parts of modified polyurethane, the preparation method comprises the following steps: dispersing the nano silicon dioxide in water, carrying out ultrasonic treatment, uniformly stirring to form a stable suspension, respectively adding the hydrated calcium silicate and the modified polyurethane, uniformly stirring, sequentially adding the Portland cement, the benzoxazine resin and the gravel, and stirring and mixing until the slurry is uniform to obtain the repair mortar material. The composition can be used for repairing bridge expansion joints, and has the advantages of good durability, high compressive strength and the like.

The invention discloses modified cement-water glass slurry and a preparation method thereof, and belongs to the technical field of building material preparation. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 50-70 parts of Portland cement, 20-35 parts of a water glass solution, silica fume, modified nano-silica, an early strength agent and the like, carrying out dry mixing on solid powder, stirring with part of deionized water to form base slurry, adding the water glass solution and the rest deionized water, and carrying out high-speed dispersion to obtain a slurry; and finally, carrying out ultrasonic treatment for 10-15 minutes at the frequency of 20-40 kHz and the power of 300-500 W. Wherein the early strength agent is compounded by triethanolamine and sodium sulfate according to the ratio of 1: 2-1: 3. According to the method, through raw material compounding and process optimization, the dispersity, the early strength and the crack resistance of the slurry are improved, and the method is mainly used for grouting operation in the field of construction engineering such as foundation reinforcement and water prevention and leakage stoppage.

The invention discloses quick-hardening high-strength lightweight aggregate concrete, which is prepared from the following raw materials: ordinary Portland cement, quick-hardening sulphoaluminate cement, a mineral admixture, silica fume, ceramsite, river sand, water and an additive, and the additive is a mixture of a water reducing agent, a slump retaining agent, a retarder, a thickening agent and an air entraining agent; after the ceramsite absorbs water and is saturated, the surface of the ceramsite is coated with a cementing material, and the cementing material is hydrated to form a slurry shell; ordinary Portland cement and quick-hardening sulphoaluminate cement are compounded, mineral admixtures and silica fume are doped, the early strength of the lightweight aggregate concrete can be improved, meanwhile, the development of later strength is guaranteed, a layer of slurry'shell 'is formed on the surface of ceramsite through the hydration effect of the cementing material, and the surface of the ceramsite is wrapped by the composite cementing material. According to the ceramsite wrapped with the ash, firstly, the strength of the ceramsite can be improved, and then the strength of the concrete is improved; 2, the water absorption and water return phenomena of the ceramsite can be avoided; and thirdly, the floating phenomenon of the ceramsite can be improved.