4165 results about "Water reducer" patented technology

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 a cement-based aerogel heat preservation and heat insulation coating material for concrete and a spraying construction process of the cement-based aerogel heat preservation and heat insulation coating material, and belongs to the technical field of concrete materials. The coating material is prepared from powder, composite emulsion and water, and the powder is prepared by mixing superfine sand, cement, modified silicon dioxide-carbon nanotube composite aerogel powder, hollow glass beads, nanofibers, graphene nanosheets, an ultraviolet light absorber, a water reducing agent and a defoaming agent. The composite emulsion is composed of an acrylate copolymer emulsion, a polyvinyl acetate-ethylene emulsion, a temperature-sensitive polymer emulsion and a coalescing agent. Based on the multi-stage pore network and multi-component emulsion optimization design and multi-component synergistic effect, the material has good fluidity after being mixed, and has low heat conductivity coefficient, high strength and high toughness after being hardened; the construction technology of high-pressure water flushing and layered spraying is provided, and the method has the advantages of being efficient in construction, stable in quality and the like and can be applied to heat preservation and heat insulation of a concrete structure in a severe environment.

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 ultra-high performance concrete and a preparation method thereof. The ultra-high performance concrete comprises the following components in percentage by mass: 15%-25% of cement, 3%-6% of nano SiO2, 30%-35% of fly ash or steel slag powder, 35%-40% of recycled aggregate, 1%-4% of fiber, 0.5% of a microbial remediation agent and 1%-3% of nano TiO2. The preparation method comprises the following steps: S1, pretreating the recycled aggregate; and S2, packaging the microbial remediation agent: mixing the bacillus pasteurii spores with calcium lactate, and wrapping the mixture in calcium phosphate microspheres. S3, step-by-step stirring; S3.1, dry mixing: uniformly stirring the cement, the fly ash, the nano SiO2, the nano TiO2 and the recycled aggregate; s3.2, wet mixing is carried out, water solution fibers containing the polycarboxylic acid water reducing agent are added, uniform stirring is carried out, and the water-binder ratio of the water solution containing the polycarboxylic acid water reducing agent is 0.18; s3.3, final mixing: adding the packaged microbial remediation agent, and uniformly stirring; and S4, directional curing: performing steam curing at 80 DEG C for 48 hours, performing ultraviolet irradiation, and performing constant-temperature and constant-humidity curing for 7 days. The ultra-high performance concrete has the effects of low cost, low carbon emission, multi-function integration and repeatable crack self-repairing.

The invention relates to the technical field of filling materials, and particularly discloses an ardealite-based high-strength anti-seepage filling material and a preparation process thereof, the ardealite-based high-strength anti-seepage filling material comprises 50%-65% of pretreated ardealite, 15%-25% of Portland cement, 5%-15% of superfine slag powder, 5%-10% of electrolytic manganese residues, 5%-8% of silica fume, 3%-6% of metakaolin, 2%-4% of a composite alkali activator and 0.5%-1.2% of a polycarboxylic acid water reducer, 0.3%-0.8% of an organic silicon water repellent and 0.05%-0.1% of cellulose ether; according to the invention, through chemical reaction of Mn < 2 + > in the electrolytic manganese residue and SO4 < 2-> in the phosphogypsum, micron-sized manganite crystals (MnAl2 (SO4) 4. 22H2O) are generated to actively fill internal micro-cracks of the material, so that a filling body is endowed with a self-repairing function and the impermeability is improved, and a composite alkali activator composed of NaOH and water glass is used for synergistically activating potential gelling activity of the superfine slag powder and the silica fume, so that the self-repairing filling material is prepared. And the formation of hydration products is accelerated, and 0.3-0.5 T of pulsed magnetic field is applied in the stirring process, so that the manganite crystals are guided to orderly grow along the expected stress direction of the filling body, and the compressive strength is improved.

The invention discloses a high-performance green and environment-friendly single-component polymer cement waterproof dry blend and a preparation method thereof, and relates to the technical field of building materials, the high-performance green and environment-friendly single-component polymer cement waterproof dry blend comprises the following components: an inorganic cementing material, latex powder, graded quartz sand, a functional filler, cellulose ether, an organic silicon defoamer, a polycarboxylic acid water reducer and compound fibers; the functional filler is modified waste glass powder prepared through mechanical activation and silanization modification; the compound fiber is a mixture of modified glass fiber and modified polypropylene fiber; the preparation of the modified glass fiber comprises tannic acid and polyethyleneimine combined modification and graphene oxide modification, and the preparation of the modified polypropylene fiber comprises plasma activation. The polymer cement waterproof dry blend prepared by the method adopts the glass powder to replace natural mineral filler, is energy-saving and environment-friendly, and the cement matrix is modified by various fibers, so that the prepared polymer cement dry blend is excellent in comprehensive performance.

The invention relates to the technical field of cement-based repair mortar, and particularly discloses a preparation method of an early-strength quick-hardening anti-carbonization cement-based repair mortar material, which comprises the following steps: (1) uniformly mixing calcium silicate or pseudo-wollastonite and saturated lime water, adding basalt fiber, and carrying out heating reaction, and uniformly mixing the fiber with sodium silicate powder, calcining in a protective atmosphere, uniformly mixing the obtained fiber with saturated lime water, and drying to obtain the anti-carbon modified fiber. And (2) uniformly mixing red mud, silica fume, sodium silicate powder and water, curing, grinding, and calcining the powder to obtain the anti-carbonization additive. And (3) mixing sulphoaluminate cement, fine aggregate, solid waste-based filler, the anti-carbon modified fiber, the anti-carbonization additive, a water reducing agent and a defoaming agent, adding mixing water, and uniformly stirring to obtain the cement-based repairing mortar material. According to the invention, the carbonization resistance of the sulphoaluminate cement-based repair mortar is effectively improved, the durability is improved, and the problem of strength shrinkage in the later period is prevented.

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 a preparation process of a fireproof lightweight thermal-insulation cement-based mortar material, which comprises the following steps: (1) placing porous lightweight aggregate in a sodium silicate solution for standing, and drying the obtained aggregate to obtain pretreated thermal-insulation aggregate; (2) uniformly mixing silica fume, calcium silicate powder, calcium hydroxide powder and water to form slurry; mixing the pretreated thermal insulation aggregate with the slurry, separating, airing the aggregate, and curing to obtain the primary thermal insulation aggregate. And (3) spraying water on the primary thermal insulation aggregate for wetting, then spraying ethanol containing a silane coupling agent, and airing to obtain the modified thermal insulation aggregate. And (4) uniformly mixing Portland cement, the modified thermal insulation aggregate, basalt fiber and a water reducing agent as raw materials, adding water, and uniformly stirring to obtain the mortar material. According to the invention, the water absorption rate of the porous lightweight aggregate is reduced, so that the adverse effect of the high water absorption characteristic of the aggregate on the mechanical properties of the mortar material is effectively reduced.

The invention provides an early-strength rapid-repair grouting material and a preparation method thereof, and the early-strength rapid-repair grouting material is mainly prepared from the following raw materials: 50 to 150 parts of sulphoaluminate cement, 10 to 150 parts of aluminate cement, 200 to 350 parts of a regenerated gelling powder material, 1200 to 1400 parts of quartz sand, 50 to 100 parts of silica fume, 10 to 150 parts of mineral powder, 10 to 100 parts of fly ash, 15 to 50 parts of a composite retarder, 0.1 to 2 parts of a water reducing agent and 1 to 10 parts of an early strength agent. 0.01 to 1 part of a water-retaining agent and 200 to 300 parts of water. The early-strength quick-repair grouting material is characterized in that activated low-cementitious active mineral solid waste is adopted as a main cementitious material, and the product has excellent construction stability, low-carbon weather resistance, corrosion resistance, micro-expansion quick-hardening early strength and economical efficiency.

The invention provides nano-silicon-based high-strength concrete and a preparation method thereof, and belongs to the technical field of concrete.The concrete is prepared from cement, mineral powder, fly ash, machine-made sand, first-class gravel, second-class gravel, an additive, nano-silicon or a nano-silicon composite modified material and water; the additive is a polycarboxylic acid water reducer and / or a polyether air entraining agent. According to the prepared concrete, the nano silicon material with good dispersity is added, so that the cement consumption can be reduced, the cost can be reduced, and the workability, the strength and the durability can be improved; and the preparation process is simple and convenient, is suitable for large-scale production, and can be widely applied to the engineering fields of high-rise buildings, bridges, tunnels and the like.

The invention provides a modified coal gangue-based large-flow-state grouting and water plugging material and a preparation method thereof. Comprising 80-90 parts of a coal gangue sample, 1-5 parts of Portland cement, 1-5 parts of sulphoaluminate cement, 0.51-3 parts of a polycarboxylic acid water reducing agent, 1-4 parts of cellulose ether with the viscosity of 200w, 0.1-5 parts of a calcium oxide expanding agent, 0.5-5 parts of a plastic expanding agent, 0.5-1 part of redispersible latex powder, 0.5-5 parts of polyacrylamide with the molecular weight of 1000 and water, and the water-material ratio is 0.4. According to the modified coal gangue-based large-flow-state grouting and water plugging material and the preparation method thereof, the cement consumption can be remarkably reduced, the cost is reduced, the utilization rate of solid wastes (such as coal gangue) is increased, and the material has good flow-state performance and adjustable setting time; the method is suitable for deep and large shaft surrounding rock water seepage treatment in coal mining and other mine engineering.

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 a preparation method of capillary crystalline self-repairing concrete, which comprises the following steps: adding zeolite powder into a urease solution for dipping treatment to obtain pretreated zeolite powder; adding the pretreated zeolite powder into a mixed solution A containing urea and sodium alginate, adding a calcium chloride solution A, and separating a solid phase to obtain coated zeolite powder; fumed silica is added into a magnesium chloride solution to be mixed, polyethylene glycol is added, ultrasonic dispersion is conducted, and dispersion liquid is obtained; mixing the coated zeolite powder with the dispersion liquid, adding a sodium alginate solution, mixing, adding a calcium chloride solution B, and separating a solid phase to obtain modified zeolite powder; mixing preparation raw materials including the modified zeolite powder, the cement, the fly ash, the polycarboxylic acid water reducing agent and the aggregate to obtain the concrete. The concrete prepared through the method is good in crack self-repairing effect and good in mechanical strength, and the durability and the service life of the concrete can be improved easily.

The invention provides solid-waste-based fluid-state solidified soil and a preparation method of the solid-waste-based fluid-state solidified soil. The solid waste-based flow state solidified soil comprises a filling material, a framework material and a reinforcing material, the filling material comprises the following components in parts by weight: 60-95 parts of engineering residue soil, 5-40 parts of alkaline waste residues, 5-30 parts of a cementing material, 1-10 parts of a polymer emulsion, 0.5-3 parts of silica fume, 0.1-1 part of cellulose ether, 0.1-1 part of a compound water reducing agent and 0.5-2 parts of an exciting agent. The framework material comprises waste concrete blocks and / or waste brick blocks; the reinforcing material comprises a waste safety net and / or fiber gridding cloth. The flow-state solidified soil can achieve rapid backfilling in a narrow space, is excellent in shrinkage cracking resistance and impermeability, simple in preparation method and convenient to apply and construct, effectively solves the problems that the flow-state solidified soil is large in shrinkage, prone to cracking and the like, improves the quality of a backfilling project, achieves in-situ resource utilization of construction waste, and reduces the construction cost. And the construction cost of engineering can be reduced, and the problems of land occupation, environment pollution and the like caused by solid waste stacking are reduced.

The invention belongs to the field of modified self-repairing calcium aluminate cement 3D printing, and particularly relates to a phosphate modified self-repairing calcium aluminate cement 3D printing material and a preparation method thereof. The phosphate modified self-repairing calcium aluminate cement 3D printing material prepared by the invention is prepared from the following raw materials in parts by mass: 60 to 70 parts of calcium aluminate cement, 3 to 7 parts of silica fume, 2 to 4 parts of metakaolin, 0.5 to 3.5 parts of double-template modified calcium bentonite, 0.8 to 1.5 parts of amino modified sodium polyphosphate and 0.15 to 0.8 part of basalt fiber. The invention relates to a concrete anti-microbial agent, which is prepared from the following raw materials in parts by weight: 20-30 parts of water, 20-30 parts of water, 20-30 parts of water, 20-30 parts of nano calcium carbonate, 20-30 parts of nano calcium carbonate, 20-30 parts of magnesium phosphate cement coated bacteria-loaded porous microspheres, 20-30 parts of a polycarboxylate superplasticizer, 20-30 parts of an organic silicon defoaming agent and 25-35 parts of mixing water. The technical-economic cooperation requirement of building 3D printing under complex working conditions is met, and various indexes of phosphate modified calcium aluminate cement applied to the 3D printing technology are met.

The invention discloses a high belite sulphoaluminate cement-based two-component grouting material and a preparation method thereof. The grouting material comprises a gelling component and a coagulating reinforcing component, wherein the gelling component is prepared from a high belite sulphoaluminate cement clinker and an additive A; the admixture A comprises a water reducing agent, a retarder and slow-release minerals; the coagulating and reinforcing component comprises ordinary Portland cement clinker, calcium hydroxide, gypsum and an additive B; the admixture B comprises a water reducing agent and an early strength agent. According to the high belite sulphoaluminate cement-based grouting material, the formula composition of the high belite sulphoaluminate cement-based grouting material is optimized, so that the hydration process of the high belite sulphoaluminate cement is more continuous and lasting, and the compressive strength of the obtained high belite sulphoaluminate cement-based grouting material can be continuously improved.

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 high-performance fluid-state solidified soil for backfill based on composite ardealite of building residue soil, which is prepared by taking the building residue soil as a core raw material, taking a compound of a polycarboxylic acid water reducer and hydroxypropyl methyl cellulose as a fluidization regulator, and mixing the fluidization regulator and the building residue soil to prepare the high-performance fluid-state solidified soil for backfill. Superfine slag powder, fly ash, nano silicon dioxide, metakaolin and ardealite are used as curing agents, so that the fluid-state solidified soil with strong performance is obtained. Through the synergistic effect of all the components and innovative processes such as liquid nitrogen low-temperature grinding, nano material compounding and a segmented vacuum stirring process, the effect that the ultrahigh strength of the construction waste soil reaches 7.5 MPa within 14 days is achieved for the first time and is improved by 40% or above compared with that of conventional solidified soil, and the industrial problem that traditional waste soil is insufficient in solidification strength is solved; and collaborative optimization of strength and fluidity is realized. Meanwhile, efficient resource utilization of the construction waste is achieved, land occupation and environmental pollution caused by muck landfill are greatly reduced, and the requirement for green and sustainable development is met.

The invention discloses a composite gas hole sealing material and a preparation method thereof. The composite gas hole sealing material is prepared from the following raw materials in parts by weight: 35-50 parts of Portland cement, 50-65 parts of a solid waste-based cementing material, 1-5 parts of an active exciting agent, 1-5 parts of an early strength agent, 3-5 parts of a microcapsule expanding agent, 0.2-0.4 part of a water reducing agent and 1-3 parts of an accelerator. According to the composite gas hole sealing material disclosed by the invention, the dissolution and hydration of the solid waste-based cementing material are accelerated through the active exciting agent, and the generation of a hydration product is promoted through early-strength excitation including the synergistic effect of alkylol amine and nano-spray calcium silicate, so that the early strength of the composite gas hole sealing material is greatly improved; expansion components released after the composite gas hole sealing material is extruded and fractured by a drilled hole react with hydration products to generate ettringite to compensate shrinkage and improve the sealing performance, and the performance of the composite gas hole sealing material is further optimized under the assistance of a proper amount of a water reducing agent and a proper amount of an accelerator. The composite gas hole sealing material is simple in preparation process and low in production cost.

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 a method for preparing high-performance cement mortar based on NaOH activated coal gangue, which comprises the following steps: putting preliminarily crushed coal gangue into a rod mill for crushing and screening to obtain undersize coal gangue and oversize coal gangue; calcining the treated coal gangue, and putting the calcined product into a rod mill for fine grinding to obtain an admixture; weighing the admixture and the cement in proportion, and uniformly stirring and mixing to obtain a cementing material; the preparation method comprises the following steps: pouring a cementing material and gravel into a stirrer according to a mortar ratio, uniformly stirring, dissolving an exciting agent NaOH and a water reducing agent into water, pouring into the stirrer, and uniformly stirring the mixed materials to obtain the final high-performance cement mortar. The coal gangue is calcined and ground by a rod mill to serve as the admixture to replace part of the Portland fly ash cement, and the exciting agent NaOH is added, so that the bending strength and the compressive strength of a test piece added with the exciting agent NaOH are increased, and the admixture is effectively excited and activated by the NaOH.

The invention relates to the technical field of concrete, and particularly discloses super-retarded concrete for an ultra-large pile and a preparation method of the super-retarded concrete. The super-retarding concrete for the ultra-large pile is prepared from the following raw materials in parts by mass: 320 to 400 parts of a cementing material, 1820 to 1960 parts of aggregate, 20 to 28 parts of an inorganic-organic hybrid retarding reinforcing agent, 7.2 to 11.6 parts of a polycarboxylate superplasticizer and 85 to 98 parts of water, the inorganic-organic hybrid delayed coagulation enhancer is prepared by carrying out in-situ free radical polymerization reaction on a hydroxyl acrylate monomer, acrylamide and nano silicon dioxide. According to the inorganic-organic hybrid retarding reinforcing agent, a hybrid substance is formed through a chemical bond, an organic phase is chelated with calcium ions to realize retarding and does not excessively inhibit cement particles, inorganic phase nano silicon dioxide has no agglomeration risk, gaps are filled, a stable product is generated to resist alkali erosion, and the super retarding performance and the long-term strength of concrete are both considered; and the service life of the ultra-large pile is prolonged.

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

The invention belongs to the technical field of cement pole materials, and particularly relates to a high-strength cement pole material and a preparation method thereof. The high-strength cement pole material is prepared from the following components in parts by weight: 450 to 500 parts of cement, 60 to 80 parts of fly ash, 500 to 550 parts of fine aggregate, 800 to 1000 parts of coarse aggregate, 80 to 120 parts of slag powder, 30 to 50 parts of composite fiber, 5 to 10 parts of redispersible latex powder, 2 to 6 parts of water reducing agent and 100 to 150 parts of water, the composite fibers comprise modified basalt fibers and polypropylene reticular fibers. According to the high-strength cement pole material provided by the invention, the polypropylene reticular fibers and the specific modified basalt fibers act together, so that the cement pole material has high compressive strength and high breaking strength, and a cement pole prepared from the cement pole material has high flexural capacity.

The invention discloses a high-early-strength quick-hardening cement-based material for a low-temperature environment and a preparation method of the high-early-strength quick-hardening cement-based material. The cement-based material is prepared from the following components in parts by weight: 400 parts of sulphate aluminium cement, 100 parts of coal ash, 150 parts of water, 0.05-10 parts of lithium carbonate and 2 parts of a water reducing agent. According to the invention, high-purity lithium carbonate (gt; the early-stage hydration activity of the sulphoaluminate cement in a low-temperature (-5 DEG C) environment is remarkably improved, and good workability and compactness of slurry are ensured by combining an optimized mixing ratio and a polycarboxylic acid high-efficiency water reducing agent, so that a foundation is laid for early-stage strength development; the preparation method of the cement-based material provided by the invention is simple to operate, does not need complex pretreatment, and does not affect the construction period. Meanwhile, the industrial by-product fly ash is utilized, the resource utilization trend is met, energy is remarkably saved through the simplified maintenance process, and carbon emission is reduced.

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

The invention discloses a preparation process of a waste concrete recycled aggregate gypsum-based wall material, which comprises the following steps: (1) mixing a water repellent agent with an anhydrous solvent to obtain a pretreating agent, and then adding concrete recycled aggregate for standing; and separating out the recycled aggregate and drying the recycled aggregate to obtain the pretreated recycled aggregate. (2) calcining the magnesium oxide whisker, and then adding the obtained calcined whisker into an ethanol solution of polyethylene glycol to form a suspension; and spraying the suspension on the continuously stirred pretreated recycled aggregate, and then carrying out heating and stirring treatment to obtain the modified recycled aggregate. And (3) uniformly stirring ardealite powder, silica fume, potassium hydroxide powder and fine aggregate, then adding water, a retarder and a water reducing agent, uniformly stirring, then adding the modified recycled aggregate, and uniformly stirring, thereby obtaining the product. The process provided by the invention not only reduces the adverse effect of the recycled aggregate on the gypsum-based material, but also improves the water resistance of the gypsum-based material and enhances the mechanical strength.

The invention discloses a liquid cement grinding aid and a preparation method thereof, and belongs to the technical field of cement grinding aid preparation, the liquid cement grinding aid comprises the following raw materials by weight: 76-80% of water, 18-20% of hydrochloric acid and 2-4% of sodium hexametaphosphate. The preparation method of the liquid cement grinding aid comprises the following steps: uniformly mixing the raw materials according to the weight percentage, and carrying out activation reaction to prepare the liquid cement grinding aid. The cement grinding aid disclosed by the invention is prepared by mixing hydrochloric acid, water and sodium hexametaphosphate according to a specific proportion, and through scientific regulation and control of the synergistic effect of all the components, the cement grinding aid has good grinding aiding performance and remarkably improves the specific surface area and grinding aiding efficiency of cement; the component design fully considers the cement hydration process and the compatibility with the water reducing agent.

The invention discloses multi-source composite expansion super-early-strength concrete and a preparation method thereof. The concrete comprises a cementing material, aggregate, a water reducing agent, water and a multi-source composite expansion system. The expansion system is composed of a plastic expansion agent, a calcium sulphoaluminate early expansion source, a magnesium oxide delayed expansion source and an internal curing material. Through precise component design and function time sequence matching, a cooperative compensation network covering the whole life cycle of the concrete is constructed, a plastic expanding agent inhibits plastic shrinkage, calcium sulphoaluminate compensates early-stage self-shrinkage, magnesium oxide resists medium-and-long-term drying shrinkage, an internal curing material provides continuous moisture guarantee for the above process, and the overall performance of the concrete is improved. And the efficiency of each expansion source is excited and coupled. According to the invention, seamless and accurate shrinkage compensation from a plastic stage to a service later stage can be realized on the premise of ensuring the super early strength characteristic of the concrete, the technical problem that the super early strength concrete is easy to crack due to severe shrinkage is fundamentally solved, and the volume stability and durability of the structure are remarkably improved.