897 results about "Aggregate (composite)" patented technology

The invention provides a solid waste filling material ratio optimization method of a magnesium slag-steel slag composite cementing material, and relates to the technical field of solid waste filling. The method comprises the following steps: mixing magnesium slag, steel slag, desulfurized gypsum and mineral slag to prepare a cementing material, and carrying out pretreatment and physicochemical property analysis on raw materials by taking tailings and waste rocks as filling aggregates; then designing a cementing material proportioning scheme and carrying out strength test to obtain an optimal ratio of the cementing material; then considering different slurry concentrations and plastic-to-bone ratios, and carrying out an all-solid waste filling slurry rheological test and an all-solid waste cementitious body strength test; and finally, according to the two test results, establishing a multi-objective optimization model taking the on-way resistance and the filling material cost as optimization objectives and taking the strengths of cementitious bodies at different ages as constraint conditions, and determining optimal parameters of the full-solid waste filling material. According to the invention, resource utilization of the metallurgical solid waste and the mine solid waste is realized, the bottlenecks of high carbon emission and high cost of a cement-based filling material are broken through, and a solution is provided for co-processing of the mine solid waste.

The invention relates to a thermal insulation evaluation method for a light recycled building block based on thermal coupling simulation, which comprises the following steps: modeling the recycled building block into a heterogeneous multiphase complex, and introducing a three-layer structure field of micro pores, mesoscopic aggregates and macroscopic blocks; a partition coupling strategy is adopted, a microstructure variability-heat flux density disturbance-stress field reconstruction causal chain is constructed, and macroscopic thermal insulation performance fluctuation caused by thermal deformation is captured; tracking a thermal stress concentration area caused by temperature difference change through thermal and force coupling simulation; analyzing the influence of a thermal stress migration path on local structure integrity, pore change and crack evolution; constructing a thermal stress and structure disturbance factor framework, and evaluating the influence degree of the structure local deformation on the thermal resistance; extracting high-dimensional feature data; establishing a heat and force characteristic space; constructing a response surface equation, and mapping a change track of the thermal insulation performance in a heat and force coupling response space; a time and structure response composite scoring system is formed, real coupling of multiple physical fields is achieved, and limitation of traditional evaluation is broken through.

The invention discloses fiber-reinforced anti-crack concrete and a preparation method thereof, and relates to the technical field of building materials, the fiber-reinforced anti-crack concrete comprises the following raw material components: 310-450 parts of cement, 150-190 parts of water, 930-1200 parts of coarse aggregate, 630-800 parts of fine aggregate, 80-180 parts of mineral active admixture, 1.2-18 parts of multi-element composite fiber, 1.8-4.5 parts of polycarboxylic acid water reducer, and 20-35 parts of anti-crack synergistic system. Through a quaternary fiber system, a three-dimensional interlocking net-shaped crack-resistant framework is formed in concrete slurry, the problems that the single fiber reinforcement effect is limited, and the interface bonding force with a concrete matrix is insufficient are solved, and the crack resistance and the mechanical property of the concrete are improved.

The invention discloses crack-chloride ion double-triggered subsea tunnel corrosion-resistant concrete and a preparation method thereof, and relates to the field of subsea tunnel engineering materials. The concrete is prepared from the following components in parts by weight: 400 to 500 parts of Portland cement, 50 to 80 parts of fly ash, 60 to 100 parts of superfine mineral powder, 1000 to 1100 parts of coarse aggregate, 700 to 800 parts of fine aggregate, 140 to 160 parts of water, 10 to 20 parts of self-repairing microcapsules and 1 to 5 parts of a water reducing agent, the self-repairing microcapsule comprises a capsule wall material, a self-repairing material and a layered dihydroxyl composite metal oxide. A crack-chloride ion double-response system is constructed, and the limitation of traditional single trigger repair is broken through. When a crack with a certain width appears in the concrete, the capsule wall of the self-repairing microcapsule is broken to release the repairing component, so that effective filling of the crack is realized; and meanwhile, the layered double-metal hydroxide can directionally adsorb chloride ions to form a stable compound, so that the migration rate of the chloride ions is remarkably reduced.

The invention discloses a high-toughness impervious polymer modified cement-based grouting material and a preparation method thereof, and belongs to the technical field of building repair materials. The component A is prepared from a cementing material, an admixture, a fine aggregate, a composite expanding agent, a polymer for concrete modification, fibers, an early strength agent, a water reducing agent, a composite retarder, a defoaming agent, an air entraining agent, a nano material and a functional component. The system solves the technical contradiction of toughness-strength-impermeability in the polymer modified cement-based material, and the material has excellent comprehensive performance: the initial fluidity is greater than or equal to 330 mm, the 28d compressive strength is greater than or equal to 82 MPa, the breaking strength is greater than or equal to 16.8 MPa, the bending-compression ratio is greater than or equal to 0.19, the impermeability pressure value is greater than or equal to 2.6 MPa, and the material is suitable for the fields of prefabricated buildings, tunnel engineering and the like.

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

The invention discloses high-strength concrete and a preparation method thereof in the field of concrete. The high-strength concrete is prepared from the following raw materials in parts by weight: superfine sulphoaluminate cement; coarse aggregate; quartz sand; silica fume; coal ash; nano metakaolin; silicon carbide whiskers; a graphene oxide; a pH responsive microcapsule; coating the steel fibers with liquid metal; a carbon nanotube; and a polycarboxylic acid water reducer. Release of the repairing agent is accurately regulated and controlled by adopting the pH response microcapsule, the interface performance is enhanced by combining with the liquid metal coating steel fiber, and the composite dispersion process of the nano material is optimized. Wherein the environment response efficiency of the microcapsule is remarkably improved through the collaborative design of a calcium oxide-slow release agent system and a methyl methacrylate / acrylic acid copolymerization shell layer; according to the gallium-based liquid metal coating, metallurgical bonding of fibers and a matrix is achieved through the low-melting-point characteristic, and traditional physical bonding limitation is broken through.

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 provides a low-carbon concrete coarse aggregate close packing combination grading formula and a determination method, and relates to the technical field of building materials, the formula comprises a coarse aggregate skeleton, a fine aggregate, a low-carbon cementing material, water and an admixture, the coarse aggregate skeleton is composed of four different size fractions, and the purpose is to achieve the closest packing to reduce the cement requirement and improve the cement quality. The low-carbon cementing material is composed of cement, a conventional low-carbon mineral admixture and a low-carbon composite mineral admixture, and the low-carbon composite mineral admixture comprises an active component A and a micro-filling component B. The determination method comprises the steps of system characterization and model establishment, slurry skeleton iterative collaborative optimization and formula determination. The porosity is reduced to the maximum extent by optimizing coarse aggregate grading, the cement consumption is greatly reduced, meanwhile, through the synergistic effect of the high-performance, high-proportion and low-carbon admixture, the working performance, physical and mechanical properties and durability of the concrete are ensured, carbon emission and material cost are remarkably reduced, industrial solid waste is effectively utilized, and the economic benefit is increased. And green low-carbon preparation of the concrete is realized.

The invention relates to the technical field of building materials, in particular to anti-crack mass concrete and a preparation method thereof, and the concrete is prepared from a gelling system, composite aggregate, a gradient functional additive and water according to a specific ratio. The preparation method is achieved through premixing, gradient stirring and gradient temperature control curing, the three-stage expansion effect of the compound expanding agent is utilized to be matched with the concrete shrinkage process, the hydration heat inhibitor is combined for reducing the temperature peak, basalt fiber is used for reinforcing, and the cracking risk is quantitatively evaluated, so that the 28-day restrained expansion rate of the concrete reaches 0.012% or above, the cracking risk coefficient is smaller than or equal to 0.7, and the concrete has the good crack resistance. The hydration heat peak value is reduced to 48 DEG C or below, and the cement is suitable for engineering of ultra-long structures, large-volume side walls and the like, has no harmful cracks within one year or above, has crack resistance and mechanical properties, and is wide in application prospect.

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

Disclosed in the present invention are a prefabricated composite floor slab and steel bar truss floor deck directly utilizing old slabs, and a method. The prefabricated composite floor slab comprises new concrete, old concrete slabs, a slab bottom reinforcing mesh, a slab surface reinforcing mesh, steel bar trusses, steel dowel bars, and post-cast concrete. The steel bar truss floor deck comprises new concrete, old concrete slabs, a steel base plate, a slab surface reinforcing mesh, steel bar trusses, steel dowel bars, and support steel bars. According to the present invention, the old concrete slabs are directly utilized instead of being crushed into recycled blocks or recycled aggregates for reuse, thereby greatly simplifying processing procedures, significantly increasing the recycling rate of old concrete, and significantly reducing the usage amounts of new concrete and corresponding cement, thus achieving a significant carbon emission reduction effect; through holes are vertically drilled in the old concrete slabs, the steel dowel bars are inserted into the through holes, gaps between the steel dowel bars and the through holes are then filled with a high-strength grouting material, and shear resistance members are arranged on the side edges of the old concrete slats to enhance the shear resistance at the interface between the new concrete and the old concrete.

The invention provides a sintered hollow batten for buildings and a preparation method, and belongs to the technical field of novel wall materials, the sintered hollow batten for buildings comprises the following raw materials: high-calcium fly ash, construction waste recycled aggregate, clay, sulphoaluminate cement, a foaming agent, reinforced fibers and an additive; wherein the particle size of the construction waste recycled aggregate is 0.5-5mm, and the construction waste recycled aggregate is subjected to plasma activation treatment; a nano TiO2 photocatalytic coating is loaded on the surface of the construction waste recycled aggregate; the reinforced fibers are composite fibers of basalt fibers and polypropylene fibers, and the mass ratio of the basalt fibers to the polypropylene fibers is (1: 1)-(1: 2). According to the sintered hollow batten for the building, the building waste recycled aggregate subjected to plasma activation treatment is adopted, and the nano titanium dioxide photocatalytic coating is loaded, so that the bonding strength of the aggregate is greatly improved, and the hollow batten is endowed with the function of degrading pollutants such as formaldehyde.

The invention discloses high-strength corrosion-resistant pervious concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete is prepared from the following raw materials in parts by weight: 200-300 parts of cement, 1000-1300 parts of coarse aggregate, 20-30 parts of a composite admixture, 10-20 parts of a reinforcing agent, 1-1.5 parts of a water reducing agent, 3-5 parts of an additive and 100-130 parts of water, the reinforcing agent is prepared from modified basalt fiber and styrene-acrylic emulsion according to the mass ratio of (8 to 10): 1; the additive is a SiO2 (at) PDA (at) zeolite composite material; the composite admixture is composed of fly ash and modified steel slag powder according to a mass ratio of 2: 1. According to the invention, by optimizing the proportion of a plurality of composite materials, the interface bonding property with a gel material matrix is improved, the mechanical property and durability are remarkably improved while the water permeability is maintained, and the corrosion resistance of the concrete matrix is enhanced.

The invention discloses multi-scale toughened concrete and a preparation method thereof, and belongs to the technical field of high leakage, and the multi-scale toughened concrete comprises aluminoferrite cement, a low-shrinkage auxiliary cementing material, a water reducing agent, multi-scale composite fibers, a shrinkage compensation agent, fine aggregate, coarse aggregate and water. A traditional toughening mode is broken through, a physical-chemical composite connection interface is established through a magnetron sputtering metal gradient coating of crude fibers and a laser-induced dendritic crystal structure, a strain hysteresis effect is triggered under an impact load, impact energy is converted into interface phase change energy, and a high-efficiency energy dissipation channel is formed; an amino functional group and free radical cross-linked network is introduced into the fine fibers, and the fibers are endowed with microcosmic dynamic enhancement capability in combination with directional arrangement of the carbon nanotubes, so that the concrete forms cooperative interaction between macroscopic crack bridging and microcosmic crack inhibition, the crack resistance under complex stress is remarkably improved, and microcrack propagation is effectively inhibited.

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 discloses a high-dosage RAP recycled asphalt mixture and a preparation method thereof, and the method comprises the following steps: step 1, carrying out homogenization treatment on an epoxy resin system and a rubber-asphalt composite system according to a weight ratio of 1: 5-1: 30 to obtain a composite modified asphalt system; 2, preheating the waste asphalt pavement material to 110-130 DEG C, performing dry mixing, adding a petroleum ether regenerant, heating to 150-170 DEG C, and performing dry mixing again to obtain a mixture 1; step 3, preheating new fine aggregate, coarse aggregate and steel slag in batches, adding into the mixture 1, and carrying out dry mixing to obtain a mixture 2 with a primary grading framework; step 4, adding the composite modified asphalt system prepared in the step 1 into the mixture 2, and performing wet mixing to obtain a mixture 3; and step 5, homogenizing the mixture 3 to finally obtain the target recycled asphalt mixture. The invention aims to realize high-mixing-amount recycling of the waste asphalt pavement material.

The present invention relates to the technical field of concrete. Disclosed is a toughening design method for fiber-reinforced concrete. The method of the present invention changes the passive control characteristics of fibers on a concrete crack propagation process in conventional fiber-reinforced concrete. Starting from the origin of composite material design, firstly, an ultrahigh-ductility composite cementitious matrix is designed; and secondly, an aggregate is incorporated. On the basis of a specific combination of matrix and aggregate parameters, a composite material develops meso-scale multiple cracking and strain-hardening behaviors between aggregate particles during external loading. The fiber-reinforced concrete prepared by this method actively disperses brittle damage and failure within the material, and avoids unstable crack propagation caused by weak interfacial bonding between the aggregate and the matrix. Compared to conventional fiber-reinforced concrete design methods, the present invention more accurately establishes relationships between material compositions, microstructures and macroscopic mechanical response, and more efficiently enhances the toughness of the material.

The invention discloses a special aggregate for high-strength UHPC (Ultra High Performance Concrete) as well as a preparation method and application thereof, and relates to the technical field of nano modification. According to the aggregate, high-strength basalt or quartz sand is used as a matrix, continuous graded particles are formed through a multi-stage crushing process, and the particle morphology and size distribution are optimized. The surface of the UHPC aggregate is modified by adopting a nano composite system, and the interface bonding performance of the aggregate and a UHPC matrix is remarkably improved by forming a gradient nano composite coating. And technological parameters are optimized, so that the uniformity and the performance stability of the coating are ensured. The aggregate can significantly improve the compressive strength, breaking strength and durability of UHPC. In the prefabricated bridge wet joint, the aggregate shows excellent construction performance and rapid maintenance characteristics, and can effectively shorten the construction period and prolong the service life of the structure. According to the invention, a high-performance special aggregate is provided for UHPC through a nano modification technology, and the development of ultra-high performance concrete in engineering application is promoted.

The invention relates to the technical field of building materials, and particularly discloses steel slag-slag composite micro powder green low-carbon concrete and a preparation method thereof. The steel slag-slag composite micropowder green low-carbon concrete is prepared from the following raw materials in parts by weight: 25-35 parts of modified steel slag microspheres, 20-30 parts of slag micropowder, 10-15 parts of cement, 30-40 parts of coarse aggregate, 1.2-2 parts of an additive and 18-30 parts of water, the steel slag microspheres are porous steel slag microspheres, an exciting agent is loaded in pores of the steel slag microspheres, and a phase change material is packaged in the pores of the steel slag microspheres; the preparation method comprises the following steps: mixing and dry-mixing the modified steel slag microspheres, the slag micro-powder and the cement, adding the coarse aggregate and the water, uniformly stirring, adding the additive, and uniformly stirring to obtain the steel slag-slag composite micro-powder green low-carbon concrete. The composition can be used in the fields of building structures, road engineering, marine facilities and the like, and has the advantages of high early strength and good mechanical properties.

The invention provides a solid waste-based high-toughness composite material. The solid waste-based high-toughness composite material is prepared from the following raw materials in parts by weight: 40-50 parts of a low-carbon solid waste cementing material, 30-40 parts of fine aggregate, 10-20 parts of fly ash, 10-20 parts of toughening fibers, 25-35 parts of water and 0.5-1 part of a water reducing agent. The invention also provides a preparation method of the solid waste-based high-toughness composite material. The solid waste-based high-toughness composite material provided by the invention has relatively good strength, toughness and durability.

The purpose of this invention is to provide a method for preparing cemented backfill materials based on response surface methodology using composite activating coal gasification slag. This method belongs to the field of mining engineering technology. Based on sorting and removing impurities from the coal gasification slag and drying it, the invention obtains ultrafine powder of the coal gasification slag for preparing the backfill material through ball milling. Then, coal gangue is crushed and screened using a crusher to obtain coarse, medium, and fine aggregates for the backfill material. Finally, cement, ultrafine coal gasification slag powder, coal gangue aggregate, activator, and water are mixed evenly to prepare the cemented backfill material. This invention not only solves the problem of low activity of coal gasification slag volcanic ash but also effectively controls the shortage of cemented backfill materials and high backfilling costs during cemented backfill mining, ensuring sustainable development. Furthermore, it effectively utilizes the widely accumulated coal gasification slag, reducing pollution and large-scale land occupation of the surrounding environment.

The invention relates to the field of maintenance engineering materials, in particular to road and bridge interface high-bonding mortar and a preparation method thereof. The road and bridge interface high-bonding mortar is prepared from the following raw materials in parts by mass: 90 to 120 parts of gel material, 100 to 150 parts of aggregate, 30 to 45 parts of auxiliary emulsion, 10 to 18 parts of composite powder, 3.5 to 7 parts of reinforcing agent, 0.5 to 1 part of water reducing agent, 0.3 to 0.6 part of cellulose ether, 0.2 to 0.3 part of starch ether, 0.8 to 1.5 parts of thixotropic agent, 0.3 to 0.6 part of defoaming agent and 20 to 40 parts of water. The finally prepared road and bridge interface bonding mortar can maintain excellent durability, environmental weather resistance and anti-erosion effect while ensuring high-strength bonding performance, so that the mortar requirements of more existing complex construction environments are met.

The invention discloses a high-content fly ash unfired water permeable brick and a preparation method thereof, and relates to the technical field of building materials, the unfired water permeable brick comprises the following raw materials by weight: 55-75 parts of fly ash, 20-35 parts of aggregate, 8-15 parts of a composite cementing material, 0.5-2 parts of toughening fiber, 1-3 parts of a pore regulator, 0.1-0.5 part of a surfactant, and 10-18 parts of water. Wherein the aggregate is 1-3mm waste ceramic particles and 2-5mm building recycled aggregate (1: 1-1: 2); and the rest components have specific proportions, specifications and modification requirements. According to the invention, 55-75 parts of F-type II-grade or higher high-content fly ash is matched with the waste ceramic particles and the pretreated building recycled aggregate to serve as the composite aggregate, solid waste is digested, natural resource dependence is reduced, and the method conforms to the direction of green building materials; by means of a modified composite fiber and composite gel system, the pressure resistance is larger than or equal to 25 MPa, the fracture resistance is larger than or equal to 3.5 MPa, the water permeability is larger than or equal to 1.5 * 10 cm / s, the freeze-thaw loss is smaller than or equal to 3.5%, and the grinding pit is smaller than or equal to 30 mm; through graded mixing, bidirectional pressurization and segmented maintenance, the porosity is kept to be 15%-25%, the percent of pass is increased, and the cost is reduced.

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.

The invention belongs to the technical field of building materials, and particularly relates to a micro-expansion anti-cracking waterproof composite deep groove filler and a preparation method thereof. The micro-bulking anti-cracking waterproof composite deep groove filler provided by the invention comprises cement, gypsum, mineral powder, nano silicon oxide, coarse aggregate, fine aggregate, modified fibers, an expanding agent, a polycarboxylate superplasticizer and water. According to the invention, polyacrylamide, calcium sulphoaluminate and magnesium oxide are adopted to jointly form an expanding agent, and early-stage-late-stage full-period shrinkage compensation is jointly formed in a concrete hydration process, so that the density of the concrete is effectively improved, and the waterproof performance of the concrete is further improved; according to the invention, sodium dodecyl benzene sulfonate and propylene glycol block polyether are adopted to carry out compound modification on graphene oxide, and gamma-aminopropyltriethoxysilane is connected to the surface of basalt fiber, so that the bonding strength of basalt fiber and a cement matrix and the compactness of the cement matrix are improved, and the waterproof and anti-cracking properties of concrete are further improved.

The invention discloses anti-cracking concrete and a preparation method thereof, and the anti-cracking concrete is prepared from the following raw materials in parts by weight: 400-450 parts of cement, 600-700 parts of fine aggregate, 900-1000 parts of gravel, 70-80 parts of a composite additive, 30-40 parts of modified fiber, 4-5 parts of a water reducing agent and 160-180 parts of water, the composite additive is prepared from fly ash, modified sepiolite, calcium sulphoaluminate and an air entraining agent; the modified sepiolite is obtained by taking sepiolite as a raw material, pretreating the sepiolite through a silane coupling agent and then sequentially reacting the pretreated sepiolite with sulfanilamide and dodecyl chloride. According to the invention, through the synergistic effect of the composite additive and the modified fiber, the comprehensive improvement of the crack resistance and mechanical strength of the concrete is realized, in the composite additive, the moderate expansion of calcium sulphoaluminate compensates the early shrinkage stress, the microbubble system formed by the air entraining agent relieves the stress concentration, and the dispersion effect of the polycarboxylate superplasticizer is matched, so that the crack resistance and mechanical strength of the concrete are improved. The hardened body forms a compact and uniform microstructure, and the tensile strength of the concrete is improved.

The invention discloses a method for synergistically preparing recycled aggregate from urban renewal garden waste and building waste, and relates to the field of treatment of garden waste and building waste. The method comprises the following steps: carrying out molecular-level deconstruction pretreatment on garden wastes, destroying cell walls by adopting dual-frequency ultrasound combined with biological enzymolysis, and treating the building wastes by combining high-pressure water jet with abrasive impact; performing nano-scale composite granulation, adding a nano-composite binder, and introducing CO2 to form a gel transition layer; by means of plasma-assisted sintering, particle diffusion is accelerated by means of radio-frequency plasma and an electric field; chemical vapor deposition is adopted, and a TiN-TiO2 gradient functional coating is formed; real-time monitoring and regulation are performed through a multi-mode sensor network and an intelligent algorithm, and process parameters are adjusted according to a product performance prediction result. The recycled aggregate disclosed by the invention is high in strength, good in heat preservation and strong in freezing resistance; negative carbon emission reduction is achieved in the production process, an intelligent system guarantees stable product quality, environmental protection and economic benefits are achieved, and urban update and solid waste treatment green transformation are promoted.

The invention provides solid-waste-based high-strength fluid-state solidified soil and a preparation method, and relates to the technical field of fluid-state solidified soil preparation, and the solid-waste-based high-strength fluid-state solidified soil comprises, by mass, 40-60 parts of waste residue soil, 10-20 parts of III-type recycled aggregate, 1-10 parts of recycled micro powder, and 10-35 parts of a composite curing agent. The method has the beneficial effects that a material system with excellent stability is constructed by integrating the III-type recycled aggregate, the recycled micro powder and the industrial solid waste, and the material system is scientific in proportion, reliable in process and capable of effectively meeting the technical requirements of various engineering scenes on the high-strength flow-state solidified soil.