2343results about How to "High compressive strength" patented technology

The invention relates to the technical field of nano ceramic materials, and discloses a high-strength nano aluminum oxide ceramic product and a preparation process thereof.The preparation process comprises the following preparation steps that aluminum oxide powder, a composite binder, composite gel, a plasticizer and a solvent are mixed and subjected to ball milling, and composite slurry is obtained; placing the composite slurry in a mold, and performing mold pressing and drying to obtain a green body; and putting the green body into a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the nano aluminum oxide ceramic product. Nano zirconium oxide and nano magnesium oxide are formed on the surfaces of the pretreated silicon carbide whiskers, and can form a solid solution with nano aluminum oxide in the sintering process to serve as a bridge of the silicon carbide whiskers and nano aluminum oxide particles, so that the binding force of the silicon carbide whiskers in a nano aluminum oxide ceramic matrix is remarkably enhanced; phosphoric acid and aluminum ammonium sulfate are firmly combined on the surfaces of nanometer aluminum oxide particles through carboxymethyl cellulose, and the situation that phosphoric acid and aluminum ammonium sulfate are not firmly combined with the nanometer aluminum oxide particles is avoided.

The invention discloses a fiber foamed concrete and a preparation method thereof. The fiber foamed concrete comprises the following raw materials in parts by weight: 5290 parts of cement, 4965 parts of water, 1.361 part of foaming solution, 1.2964 part of fly ash and 10 parts of fiber. The preparation method comprises the following steps: proportionally weighing the components; sequentially adding the cement and fly ash into a stirrer, proportionally weighing the water, uniformly stirring the mixture by the stirrer, and adding the fiber; preparing and adding the foaming solution; gradually adding the foam into the mixture, and continuously stirring until all the components are uniformly mixed; pouring the mixture into a mold on which lubricating oil is brushed, and curing in a curing chamber; after 24 hours, removing the mold; and respectively curing for 3 days, 7 days and 28 days for experimental detection. The fiber foamed concrete has the advantages of favorable thermal insulation property, favorable compression resistance and favorable bending resistance, and is applicable to a railway bed strengthening layer.

The invention discloses a carbon-silicon negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, carrying out mixed reaction on a lithium source compound, a lanthanum source compound and a titanium source compound to obtain a mixed reactant; mixing the mixed reactant with a carbon source compound, and dispersing and emulsifying to obtain element-doped microspheres; s2, carbonizing the element-doped microspheres in the step S1 to obtain carbides, and activating the carbides to obtain a porous carbon material; and S3, performing silicon deposition on the porous carbon material in the S2 to obtain silicon deposition porous carbon, and performing carbon deposition on the silicon deposition porous carbon to obtain the carbon-silicon negative electrode material. The carbon-silicon negative electrode material disclosed by the invention is high in lithium ion transmission rate, the problem of poor electronic conductivity of silicon is solved, and the electrical property of a battery can be effectively improved.

The invention relates to the technical field, and particularly discloses a nano-modified epoxy building thermal insulation material and a preparation method thereof. The nano modified epoxy building thermal insulation material is prepared from the following raw materials in parts by mass: 80 to 120 parts of Portland cement, 20 to 40 parts of slag powder, 5 to 10 parts of hollow mesoporous silicon dioxide, 0.1 to 1 part of pyrrole, 0.1 to 0.2 part of ammonium persulfate, 5 to 10 parts of nano silicon dioxide, 10 to 15 parts of bisphenol S epoxy resin, 1 to 5 parts of acrylic acid, 1 to 2 parts of polylysine, 0.01 to 0.1 part of catalyst and 1 to 2 parts of curing agent. The concrete is prepared from the following raw materials in parts by weight: 20-30 parts of epoxy resin, 4-8 parts of loaded aerogel, 0.1-1 part of polycarboxylate superplasticizer, 1-4 parts of composite fiber and 0.2-1.25 parts of hydrogen peroxide. The fireproof building material has excellent toughness, can better resist cracking and absorb energy, effectively avoids cracking and damage under the action of thermal stress, and ensures that the building material has a fireproof effect.

The invention discloses a microencapsulation repairing agent and an intelligent self-repairing ultrahigh-strength ultrahigh-toughness cement-based structural material, the microencapsulation repairing agent is mainly composed of a humidity-responsive outer layer, a pH-responsive middle layer and a temperature-responsive inner layer, and the outer layer is modified with a silane coupling agent. The intelligent self-repairing ultrahigh-strength ultrahigh-toughness cement-based structural material is mainly prepared from the microencapsulated repairing agent, nano carbon black, nano montmorillonite, nano cellulose and other raw materials. According to the invention, by introducing the self-repairing microcapsule with a specific structure and materials such as nano carbon black, nano montmorillonite and nano cellulose, the strength, toughness and durability of the concrete are remarkably improved, and the concrete has an intelligent self-repairing function.

The invention relates to the technical field of solid waste treatment, in particular to a harmless barium slag compound and a preparation method and application thereof. The preparation method comprises the following steps: grinding barium slag and desulfurized gypsum, mixing with water, and standing and curing to obtain a harmless barium slag compound; the mass ratio of the barium slag to the desulfurized gypsum is limited to be (1-10.1): 1; the mass ratio of the water to the mixture of the barium slag and the desulfurized gypsum is (0.18-0.32): 1; soluble sulfate provided by the desulfurized gypsum is used, free barium ions in the barium slag are fixed through precipitation, barium sulfate is formed, and harmless fixation is achieved. The leaching concentration (horizontal oscillation method) of heavy metal ions in the barium slag is lower than the drinking water standard and the hazardous waste identification standard, and harmless treatment of the barium slag is achieved. The problems of reduction, harmlessness and recycling of industrial solid waste (desulfurized gypsum) and hazardous waste (barium slag) can be solved, and collaborative resource utilization and environmental protection of the solid waste and the hazardous waste are promoted.

The invention provides a waterborne polyurethane enhancer, a cold-resistant and salt-resistant concrete composition as well as a preparation method and application of the cold-resistant and salt-resistant concrete composition, and belongs to the technical field of buildings and civil engineering. The waterborne polyurethane enhancer comprises diisocyanate, oligomer polyol, a small molecule chain extender, oxalic acid dihydrazide, oxaloacetic acid and a catalyst, and the cold-resistant and salt-resistant concrete composition comprises cement, aggregate, a water reducing agent, an anti-freezing agent, an air entraining agent, modified straw fibers, the waterborne polyurethane enhancer, calcium silicate and water. Through mutual cooperation of all the components, the obtained concrete has excellent cold resistance, salt resistance, impermeability and compressive strength, and can meet the engineering requirements for concrete durability and use safety under low-temperature and high-salt conditions.

The invention discloses a low-carbon high-compactness shotcrete elasticity reducing agent and a preparation method and application thereof, and relates to the field of building material concrete admixtures, the elasticity reducing agent comprises the following components by mass: 53-73% of a rheological component, 15-25% of a tackifying component, 10-18% of an early strength component, and 0.5-4% of a setting adjusting component; the rheological component comprises manganese slag powder and silica fume, and the tackifying component is tailing powder loaded with nano modified cellulose ether. The viscosity of sprayed concrete is increased through the tackifying component, the slurry wrapping property of the concrete is improved, the yield stress of the concrete is improved through the rheological component, and the early strength component is combined to synergistically improve the wall-adhering and quick-hardening properties after the material is sprayed, so that the rebound rate is reduced; the nano-particles loaded on the organic matter are hydrated in pores, harmful pores are directionally filled, the compactness and strength of the sprayed concrete are effectively improved, and low-carbon, low-resilience and high-compactness of the sprayed concrete are achieved.

The preparation method comprises the following steps: mixing agar, carrageenan and a gelatin solution to prepare a core material hydrogel; mixing sodium hydroxide, water glass and water to prepare an intermediate binder A; mixing the regenerated micro powder with biochar to prepare an intermediate binder B; mixing the binder A and the binder B to obtain an intermediate binder; mixing the regenerated micro powder and the granulated blast furnace slag powder to obtain an outer core material; putting hydrogel into the binder A and the binder B, wrapping the surface of the hydrogel with a mixed binder solution, putting the hydrogel into the binder B, obtaining a material C, and drying and curing the material C to obtain a hollow core; and granulating the hollow core, spraying the binder A while pouring the shell powder to form a spherical aggregate, and rolling the spherical aggregate at a rotating speed to obtain the unfired hollow artificial aggregate. According to the preparation method disclosed by the invention, the unfired hollow artificial aggregate with relatively low bulk density and relatively high single-particle compressive strength is prepared by taking the regenerated micro powder and the slag solid waste material as a shell and the hydrogel as an inner core in an alkali excitation manner.

The invention relates to structural health monitoring intelligent concrete for airports and a preparation method thereof, and the method comprises the following steps: adding a polycarboxylic acid water reducing agent into water, and mixing to obtain a water reducing agent solution; adding carboxylated multi-walled carbon nanotubes, silica fume and fly ash into the water reducing agent solution, and mixing to obtain a carbon nanotube suspension; performing ultrasonic treatment on the carbon nanotube suspension to obtain a carbon nanotube dispersion liquid; and adding the carbon nanotube dispersion liquid into the dry material mixture, and mixing to obtain the structural health monitoring intelligent concrete for the airport. Compared with the prior art, the conductivity of the concrete can be effectively improved, so that the concrete has the function of monitoring structural health.

The invention relates to a design method for the mix proportion of carbonized 3D printing concrete and the carbonized 3D printing concrete. Carbon dioxide is introduced into cement-based printing slurry, the introduction amount of the carbon dioxide is controlled, and when the carbon dioxide is introduced into the cement-based printing slurry, the use amount of magnesium chloride is calculated according to the content of a carbonization reaction product CaCO3 and the proportion of calcite to aragonite in a required concrete mixture. Magnesium chloride and carbon dioxide are added into the cement-based printing slurry at the same time for full reaction, and finally the 3D printing concrete material is prepared. By adding magnesium chloride and generating aragonite type calcium carbonate, the thixotropic behavior of the material is improved, the constructability of the cement slurry is higher, the orientation of the nano-scale aragonite fibers is arranged according to the printing direction, the reinforcing and toughening effects are excellent, and the bending resistance, bending resistance and compressive strength are all improved.

The invention relates to the technical field of concrete, in particular to luminous pervious concrete and a preparation method thereof. The luminous permeable concrete is prepared from the following raw materials in parts by mass: 280-300 parts of cement, 870-900 parts of interval grading coarse aggregate, 70-80 parts of modified luminous powder, 30-40 parts of fly ash, 4-6 parts of a water reducing agent, 20-30 parts of a water repellent agent, 30-40 parts of epoxy resin, 3-5 parts of a silane coupling agent and 90-100 parts of water, and the interval grading coarse aggregate is prepared by mixing coarse aggregate with a small particle size of 4.95-9mm and coarse aggregate with a large particle size of 12.5-10mm according to a mass ratio of 1: 2; the surface of the modified luminescent powder is coated with silicon dioxide sol, and sodium borate is added for heat-resistant treatment. The light-emitting water-permeable concrete has compressive strength and water permeability, the light-emitting property is stable, and the hydrophobic and oleophobic corrosion resistance in the concrete is good.

The invention discloses a toughened compression-resistant gypsum batten and a preparation method thereof.The gypsum batten is prepared from phosphogypsum, light calcium carbonate, semi-hydrated phosphogypsum, modified diatomite, modified elastomer particles, composite fibers, a retarder, a water reducing agent and water. The preparation method of the gypsum batten comprises the following steps that S1, the modified diatomite is prepared; the preparation method comprises the following steps: S1, preparing phosphogypsum, S2, preparing modified elastic particles, S3, preparing composite fibers, S4, stirring the phosphogypsum, light calcium carbonate, semi-hydrated phosphogypsum, the modified diatomite, the modified elastomer particles, the composite fibers, a retarder, a water reducing agent and water into uniform mixed slurry, pouring the mixed slurry into a mold, and carrying out extrusion molding, solidification, cutting, drying and edge sawing to obtain the toughened compression-resistant gypsum batten. Through filling and adsorption effects of the light calcium carbonate, the semi-hydrated phosphogypsum and the modified diatomite and a three-dimensional network structure of the composite fibers, the compactness and the compression resistance of the gypsum batten are jointly improved.

According to the modified fiber mining filling material and the preparation method thereof provided by the invention, through a dual modification technology of plasma treatment and a silane coupling agent, the uniform dispersity of fibers in a cementing agent is enhanced, and the properties such as rapid hardening, early strength and compressive strength retention rate of the filling material are remarkably improved. The filling material comprises cement clinker, solid waste, a retarder, an early strength agent, modified fibers, an accelerator, gypsum, a water reducing agent, a suspending agent and other raw materials, the modified fibers are treated through specific steps, surface functional groups are increased, and the compatibility and binding power of the modified fibers and a cementing agent are improved. The filling material disclosed by the invention has the advantages of good transportability, simplicity and convenience in construction, low cost and environmental protection characteristic, conforms to the development trend of green mining industry, is particularly suitable for being applied to mine filling and supporting, and has wide application prospects and social and economic values.

The invention provides microcrystalline cast stone and a preparation method and application thereof. According to the preparation method of the microcrystalline cast stone, adopted raw materials comprise 35-70 wt% of vanadium-titanium magnet tailings; wherein the content of TiO2 in the vanadium-titanium magnet tailings is not lower than 0.9 wt%, and / or the content of Fe2O3 is not lower than 9.8 wt%, and / or the raw materials further comprise a nucleating agent not higher than 7 wt%. The vanadium-titanium magnet tailings are used as main raw materials, endowed characteristic elements such as Fe and Ti in the vanadium-titanium magnet tailings are used as nucleating agents in the microcrystal cast stone production process, the low adding amount of the nucleating agents can be achieved, and even when the content of TiO2 and / or Fe2O3 in the vanadium-titanium magnet tailings is high enough, zero-adding nucleating agents can be achieved. Furthermore, the vanadium-titanium magnet tailings are taken as a main material and supplemented with other solid waste raw materials, solid waste matching is reasonably carried out, the solid waste mixing amount is increased, and the microcrystalline cast stone can be prepared from nearly all solid wastes. Further, the building material prepared from the material has a wide application prospect.

The invention relates to the technical field of building construction materials, in particular to low-carbon high-performance concrete and a preparation method thereof. The low-carbon high-performance concrete is prepared from the following preparation raw materials in parts by mass: 150 to 180 parts of Portland cement, 24 to 27 parts of sulphoaluminate cement, 120 to 150 parts of activated coal gangue powder, 60 to 80 parts of fly ash, 600 to 700 parts of gravel, 60 to 65 parts of modified basalt fiber, 20 to 25 parts of limestone powder, 10 to 12 parts of light calcined magnesia, 2 to 3 parts of accelerant, 7 to 10 parts of modified polycarboxylate superplasticizer and 180 to 220 parts of water. According to the low-carbon high-performance concrete disclosed by the invention, excellent mechanical properties and durability are ensured, the environmental protection targets of low cost and low carbon emission are achieved, and a new solution is provided for sustainable development of concrete materials.

The invention provides ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from cement, silica fume, mineral powder, fly ash, coarse sand, fine sand, a high-performance water reducing agent, a defoaming agent, a retarder, water, steel fibers, modified nano-silica sol and a wetting agent. Wherein the modified nano silicon dioxide sol is prepared by the following method: reacting a double-bond-containing silane coupling agent with unsaturated olefine acid to obtain a carboxyl-containing silane coupling agent, and then performing graft modification on the nano silicon dioxide sol by using the carboxyl-containing silane coupling agent to obtain the modified nano silicon dioxide sol. The concrete disclosed by the invention is compact in internal structure, ultrahigh in compressive strength and breaking strength and high in durability and impact resistance, and the compressive strength during normal-temperature curing is stabilized to be 200MPa or above.

The invention relates to the technical field of batteries, in particular to a porous carbon material, a silicon-carbon composite material and application of the porous carbon material and the silicon-carbon composite material. According to the porous carbon material, the micropore rate phi, the pore volume Pv and the compressive strength Cs meet the relational expression that (Cs * phi) / Pv is larger than or equal to 550 and smaller than or equal to 1050, and the micropore rate phi gt; and the compressive strength Cs is 600 to 850 MPa. The porous carbon material provided by the invention has high microporosity, and the microporosity phi, the pore volume Pv and the compressive strength Cs of the porous carbon material meet the relation that (Cs.phi) / Pv is more than or equal to 550 and less than or equal to 1050, so that the particle size of silicon particles can be effectively reduced, the absolute expansion of silicon in a carbon matrix is reduced, and the first effect and the cycling stability of the silicon-carbon composite material are improved.

The utility model discloses a combined lining structure of an underground gas storage. The combined lining structure comprises a plurality of linings and a plurality of buffer devices, wherein the number of the buffer devices is the same as that of the linings; the multiple linings are sequentially arranged on the inner wall of the underground gas storage cavern in the circumferential direction of the underground gas storage cavern, and buffering seams are reserved between the adjacent linings. Each buffering device is arranged at one buffering seam and comprises a bent buffering piece and two fixing pieces; the two ends of the buffering piece are connected with the two adjacent linings in a sealed mode through fixing pieces respectively. The buffering seams are arranged between the adjacent linings, and the buffering devices are used in a combined mode, so that during gas storage, gas pressure borne by the fragmented linings is transmitted to external surrounding rock, tension fracture damage of the linings is avoided, and the compression performance of the linings is remarkably improved; when the gas is released, the adjacent linings are mutually squeezed to form a stressed whole, instability damage is avoided, the service life of the underground gas storage can be remarkably prolonged, and the safety of the underground gas storage can be remarkably improved.

The invention provides a slag filling material and application thereof, and belongs to the technical field of slag filling materials. The slag filling material provided by the invention comprises the following raw materials: tailings, slag, water and an alkali activator, the alkali activator comprises sodium carbonate and calcium hydroxide or carbide slag. According to the invention, sodium carbonate and calcium hydroxide or carbide slag are used as the composite alkali activator, on one hand, the calcium hydroxide or carbide slag is added to reduce the concentration of slag and tailings, and water is consumed in the reaction process, so that the water-cement ratio of the filling material is reduced, and the mechanical properties of the filling material are improved; on the other hand, the concentration of calcium ions in a reaction system is increased by adding the calcium hydroxide or the carbide slag, so that the Ca / Si ratio of the hydrated calcium silicate gel is increased, the mechanical property of the filling material is improved, meanwhile, the porosity of the filling material is reduced by calcium carbonate formed by the reaction, and the mechanical property of the filling material is further improved.

The invention relates to the technical field of asphalt concrete, and discloses an anti-crack asphalt concrete material and a preparation method thereof. According to the asphalt concrete material disclosed by the invention, by adding the reinforcing filler and the composite aerogel, the crack resistance, the service life and the ultraviolet aging resistance of a matrix are remarkably improved; wherein the reinforcing filler is based on the synergistic effect among modified lignin, diatomite and hydrotalcite, the compatibility among modified lignin, diatomite and hydrotalcite is improved by utilizing a silane coupling agent, and the dispersity of the reinforcing filler in a matrix is improved, so that the crack resistance of the matrix is improved, the service life of the matrix is prolonged, and the ultraviolet resistance of the matrix is improved; the composite aerogel has excellent heat insulation performance and a three-dimensional network structure, and the crack resistance of the matrix can be improved through the synergistic effect.

The manufacturing method comprises the following steps that S1, raw materials, an organic auxiliary agent and pure water are subjected to slurry preparation in a ball milling tank according to the proportion, a boat support splitting part blank is obtained through a slip casting technology, and a boat support splitting part blank is obtained; performing natural drying and hot air drying on the green body to discharge moisture, and then fettling and carving the green body into a boat support splitting part semi-finished product meeting the size requirement; s2, putting the semi-finished product in S1 into an induction furnace, purifying and sintering at high temperature of 2000-2300 DEG C under the protection of inert gas, and obtaining a silicon carbide boat support splitting part biscuit which has the open pore porosity of 8-10% and the strength of more than 70 Mpa and contains a small amount of free carbon after high-temperature purifying and sintering; and S3, splicing the silicon carbide boat support splitting part biscuits, feeding the spliced whole boat support into a vacuum furnace, carrying out high-temperature siliconizing sintering treatment at 1650-1700 DEG C, and carrying out grinding, sand blasting, fine cleaning, impurity removal, ultrasonic cleaning and drying process treatment after discharging to obtain the low-iron-content boat support.

The utility model relates to the technical field of building materials, in particular to an assembly type PC wallboard structure which comprises two butt-joint openings symmetrically formed in the bottom end of a wallboard body, two clamping plates are symmetrically arranged in the butt-joint openings, sliding columns in sliding connection with the wallboard body are fixedly connected to the side walls of the two clamping plates, and the side walls of the two clamping plates are fixedly connected with the bottom end of the wallboard body. The top of the wallboard body is symmetrically and fixedly connected with one ends of two connecting columns. According to the wall board, the two T-shaped blocks on the top of the wall board body are inserted into the grooves in the bottom end of the other wall board body, when the T-shaped blocks abut against the inclined plane portions of the clamping plates in a sliding mode, the clamping plates can abut against the two sides by a certain distance, and then the clamping plates are rapidly reset under extrusion of the reset springs; the T-shaped block can be clamped and positioned through the two clamping plates, so that the T-shaped block can be limited through the butt joint opening in the bottom end of the wallboard body and the cover plate, the PC wallboard can be quickly assembled, and the assembling efficiency of the PC wallboard is improved.

The invention relates to a low-density AlNbTaTiZr refractory high-entropy alloy and a preparation method thereof, belongs to the technical field of metal materials, and solves the problem that a refractory high-entropy alloy material obtained by adopting a vacuum arc melting technology in the prior art is difficult to ensure relatively high strength, good plasticity and relatively low density at the same time. The preparation method of the low-density AlNbTaTiZr refractory high-entropy alloy comprises the following steps that S1, raw materials are prepared, and mixed powder is prepared according to the designed molar ratio; s2, alloy ingots are prepared, and the mixed powder is subjected to vacuum melting to obtain the alloy ingots; s3, the alloy ingot is subjected to vacuum melting, and an alloy cast ingot is obtained; and S4, the alloy cast ingot is subjected to heat treatment, and an initial-state sample is obtained. According to the low-density AlNbTaTiZr refractory high-entropy alloy and the preparation method thereof provided by the invention, the obtained alloy material is relatively low in density, relatively high in yield strength, excellent in plasticity and relatively wide in application range.

The invention discloses high-strength concrete, a well lid and a preparation method of the well lid, and relates to the field of building materials. The high-strength concrete comprises cement, coarse aggregate, fine aggregate, modified steel fibers, a polycarboxylic acid water reducer and water. Wherein the coarse aggregate comprises broken stones with the continuous grading of 5-8 mm and broken stones with the continuous grading of 10-16 mm; the fine aggregate adopts medium-coarse sand with the particle size range of 1.8-2.2 mm; the preparation raw materials of the modified steel fiber comprise an amino silane coupling agent, an epoxy resin coating and steel fiber, and the preparation raw materials of the epoxy resin coating comprise bisphenol A epoxy resin, nanoparticles, hydroxy acrylic resin, a tertiary amine catalyst and a curing agent. According to the modified steel fiber, the reinforcing effect of the steel fiber on a concrete matrix can be fully exerted, so that concrete which is high in pressure resistance and bearing capacity and especially suitable for well lid manufacturing is obtained.

The invention discloses a heavy metal curing agent and a curing method of heavy metals in coal gangue, and relates to the field of heavy metal pollution treatment. The heavy metal curing agent comprises a first curing agent, a second curing agent and a third curing agent; wherein the first curing agent comprises silt, fly ash and bentonite, the second curing agent comprises a blend and chitosan loaded on the surface of the blend, the blend comprises quartz sand and calcium carbonate, and the third curing agent comprises a silane compound. The curing agent has an excellent long-term curing effect on heavy metals, and a cured body formed by the curing agent has excellent compressive strength.

The invention discloses a foam concrete nano foaming agent and application thereof, and belongs to the technical field of concrete materials. The foam concrete nano foaming agent is composed of the following components in percentage by mass: 10-50% of cellulose; 10%-50% of a water-soluble polymer material; 5%-30% of a surfactant; and 5%-30% of nanoparticles. The foam concrete nano foaming agent provided by the invention has the advantages of low cost and good foaming effect. Nano foam generated by foaming of the foaming agent is high in stability, and when the foaming agent is applied to preparation of a foam concrete material, the foam concrete is wide in dry density range and low in collapse rate, has good mechanical properties, flowing properties, dry shrinkage properties, stability and heat insulation properties, and is wide in application prospect. The method is suitable for the fields of building materials, housing construction, road and bridge engineering, cast-in-place backfill engineering, pit goaf backfill, garbage burying and the like.

The invention discloses a preparation method of a prefabricated autoclaved aerated concrete slab made of a solid-waste-based sulfur-aluminum-iron binding material. The preparation method comprises the following steps: preparing dry substances of the material; carrying out solid waste pretreatment by a mechanical ball milling method; adding ardealite, aluminum ash, coal gangue, fly ash, steel slag and carbide slag at the moment; calcining and directionally mineralizing after pretreatment; secondarily grinding the intermediate material; adding the secondarily ground intermediate material, cement, aluminum powder and water, and foaming; after the slurry is thickened, multi-frequency vibration is carried out in the pouring process; after pouring is completed, multi-temperature curing is conducted; after curing is completed, the highly-doped solid waste-based functional prefabricated autoclaved aerated concrete slab product is obtained. According to the autoclaved aerated concrete slab, dependence on natural resources is effectively reduced, meanwhile, carbon dioxide emission in the production process is reduced, and meanwhile, the compressive strength and the breaking strength of the autoclaved aerated concrete slab are improved; the service life of the material is prolonged; the preparation process is simplified, and the production difficulty and cost are reduced.

The invention provides foamed light soil. The foamed light soil is prepared from the following raw materials in percentage by mass: 0.01%-30.00% of aeolian sand, 0.01%-30.00% of oily sludge pyrolysis residues, 25.00%-76.00% of cement, 3.00%-5.00% of a foam group and 20.00%-25.00% of water, wherein the foam group is prepared by mixing a foaming agent with water and then foaming. The invention provides a preparation method of foamed light soil. The foamed light soil prepared by compounding the aeolian sand and the oily sludge pyrolysis residues with the cement has good fluidity and mechanical properties, such as high compressive strength, high breaking strength, no heavy metal leaching, no influence on the environment and the like, meets the requirements of different layers and different grades of highway subgrades, and has good application prospects. And the regulation of foam light soil on the roadbed strength is met.

The invention relates to the technical field of 3D printing building materials, in particular to a 3D printing geopolymer composite material with low drying shrinkage and a preparation method thereof.The 3D printing geopolymer composite material is prepared from, by mass, 400 parts of slag powder, 320 parts of fly ash, 80 parts of steel slag micro powder, 1200 parts of quartz sand, 5.1-25.6 parts of sodium hydroxide, 46.4-66.9 parts of sodium silicate, 8 parts of barium chloride and 296 parts of water. The preparation method comprises the following steps: fully mixing the slag powder, the fly ash, the steel slag micro-powder and the quartz sand according to a preset mass ratio to obtain a uniform basic powder mixture; adding an alkali activator and barium chloride into the basic powder mixture, and continuously mixing until the mixture is uniform to obtain a first mixture; and adding water into the first mixture according to a preset water-binder ratio, and carrying out stirring treatment according to a preset stirring method to obtain the 3D printing geopolymer composite material with low drying shrinkage. According to the invention, the drying shrinkage can be reduced.