1274 results about "Silicate Cement" patented technology

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 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 relates to a high-strength stable solid waste-based composite cementing material and a preparation method and application thereof in the field of building materials. The high-strength stable solid waste-based composite cementing material is prepared from the following raw materials in parts by weight: 70-85 parts of composite solid waste micro powder; 10 to 20 parts of Portland cement clinker; 3-8 parts of a composite activator; 0.5 to 2 parts of a nano-scale function regulator; wherein the composite solid waste micro powder is prepared by mixing and grinding the following raw materials in parts by weight: 40-60 parts of blast furnace slag powder; 20 to 30 parts of fly ash; 10-20 parts of chemically modified electrolytic manganese residue powder; and 5-15 parts of steel slag powder. According to the preparation method, sodium metasilicate is adopted to assist medium-temperature calcination to chemically modify the electrolytic manganese residues, so that not only is the gelation activity of the electrolytic manganese residues effectively excited, but also free-state manganese, cadmium and other heavy metal ions in the electrolytic manganese residues are fixed in situ in newly formed zeolite-like silicate mineral lattices through thermochemical reconstruction; and a brand new technical path is opened up for safe and high-value utilization of the typical hazardous waste, namely the electrolytic manganese residues.

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 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 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 fiber reinforced concrete for bridge deck pavement and a preparation method thereof, and belongs to the technical field of concrete. The fiber reinforced concrete is prepared from the following raw materials: Portland cement, modified basalt fiber, a slow-release mineralizer, a stress-oriented dispersing aid and the like. The modified basalt fiber is a basalt fiber which is subjected to amino silanization through a silane coupling agent KH-550 and then is catalytically grafted with ethylenediamine tetraacetic acid and hydroxyethyl methylacrylate through DCC (dicyclohexylcarbodiimide); the slow-release mineralizer comprises calcium sulphoaluminate and silicon-based coated nano calcium sulfate; the silicon-based coated nano calcium sulfate is core-shell structure powder formed by coating a nano calcium sulfate core material with a silicon dioxide shell layer; the concrete is strong in interface bonding, excellent in dynamic fatigue resistance, good in durability and stable in volume, and the problem that the mechanical property, the durability and the dynamic anti-interference capability of the concrete cannot be considered at the same time is solved.

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

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

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

The invention 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 discloses a red-mud-based multi-element solid waste cementing material as well as a preparation method and application thereof, and belongs to the technical field of building materials. The red-mud-based multi-element solid waste cementing material comprises the following components in parts by mass: 30-40 parts of red mud, 5-15 parts of fly ash, 10-20 parts of superfine slag powder, 30 parts of Portland cement, 4 parts of dihydrate gypsum and 2-25 parts of an alkali activator, alkaline components of the red mud are utilized to excite potential activity of the superfine slag powder and the fly ash, the additional alkaline activator excites potential activity in the red mud, and meanwhile, several industrial solid wastes and the Portland cement generate gel substances such as hydrated aluminosilicate under the synergistic effect, so that the mechanical property of the cement is improved; the building material meeting the strength requirement is provided while a large amount of red mud is consumed.

The invention discloses a coal gangue-based reinforced cement composite material and a preparation method thereof, and relates to the technical field of building materials. The coal gangue-based reinforced cement composite material is prepared from a coal gangue-based reinforced admixture, calcium ion doped modified multi-walled carbon nanotubes, polypropylene fibers, P.O42.5 Portland cement, metakaolin, silica fume, a polycarboxylate superplasticizer and water, calcium ion doped modified multi-walled carbon nanotubes and a coal gangue based reinforced admixture are cooperatively added into a cement matrix, seamless filling from nanometer to micrometer is achieved, a tough interface transition area is formed, pressure is jointly borne by a compact matrix and a strong interface, the compressive strength and breaking strength of the material are remarkably enhanced, and meanwhile, the compressive strength and breaking strength of the material are greatly improved. Migration of moisture and ions is effectively blocked, and the anti-permeability performance of the material is improved.

The invention discloses a preparation method of a negative-temperature cement-based material capable of being continuously hydrated and hardened in an environment of-20 DEG C, and relates to the technical field of application materials. The negative-temperature cement-based material comprises Portland cement, fine aggregate, water, a mineral admixture, an anti-freezing agent, a water-retention thickener, a fluidity regulator, a microcapsule complex, a penetration enhancer, a silicon-aluminum disordered network precursor and an anti-freezing polypeptide chain material. Additives such as a microcapsule complex and a penetration enhancer are introduced into a cement-based system, a low-temperature activation mechanism with a synergistic effect is constructed, and the microcapsule complex can accurately release latent heat in a negative temperature environment and induce a hydration reaction to be continuously carried out; the permeation enhancer improves the interface diffusivity and breaks through a mass transfer channel of a frozen interface water layer; the silicon-aluminum disordered network precursor is used as a structure inducer to promote the recombination of a C-S-H gel structure at a low temperature; the antifreeze polypeptide chain material endows the slurry with frost crack resistance toughness through conformation adjustment and ice crystal inhibition functions.

The invention discloses a high-performance concrete repairing material, application and a concrete structure repairing method, and belongs to the technical field of concrete structure repairing. The high-performance concrete repairing material is prepared from Portland cement, rapid hardening cement, an inert mineral admixture, an early strength agent, a submicron mineral admixture, a nano material, an anti-freezing binder, fibers, a retarder, a volume compensating agent, fine aggregate, coarse aggregate, a water reducing agent, a defoaming agent and water. Through the interaction of all the components, the functions of early strength, volume stability, freezing resistance, salt freezing resistance, fracture resistance, shrinkage resistance and the like are achieved, through the synergistic effect of all the components in the material, the overall performance of the material is improved, and the material has excellent adaptability and multifunctionality under different environmental conditions; therefore, long-term stable guarantee is provided for application in various damage scenes, and the proportion of each component of the material can be adjusted according to actual requirements of concrete structures so as to meet efficient repair in different damage scenes.

The invention discloses low-carbon red-mud-based alkali-activated foam concrete and a preparation method thereof, and belongs to the field of low-carbon foam concrete. Specifically, the mix proportion and the preparation method of the low-carbon red-mud-based alkali-activated foam concrete are as follows: P.O42.5 ordinary Portland cement provided by building materials in Qingdao Weidong macro, the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd., and Jinshu New Material Co., Ltd., the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd. The Bayer process red mud powder is produced by Hebei Province Shihozhuangfei Mine Product Co., Ltd. The exciting agent is selected from an industrial liquid sodium silicate solution produced by Henan Jinmoistening New Material Co., Ltd. And solid sodium hydroxide particles with AR analytical purity of 96%; the admixture is selected from a TR-26C type polycarboxylate superplasticizer produced by Henan Fuhua Information Science and Technology Co., Ltd. And the foaming agent is a TR-E type animal protein foaming agent produced by Henan Zhuichun Information Science and Technology Co., Ltd. Compared with existing foam concrete, the low-carbon alkali-activated foam concrete provided by the invention uses a large amount of industrial solid waste, reduces the use cost, reduces the use amount of cement under the condition of ensuring the compressive strength, and is simple and convenient to operate, reasonable in process, low-carbon, environment-friendly, rapid in cement setting and hardening, and suitable for large-scale use.

The invention relates to the technical field of building solid waste resource utilization, and discloses a bamboo-based biochar and cement-based waste-based artificial aggregate preparation method, which comprises: using cement-based waste powder as a main raw material, and using ordinary Portland cement and bamboo-based biochar as auxiliary materials, firstly carrying out alkali modification or ultrasonic modification treatment on the bamboo-based biochar, and then carrying out drying to obtain the artificial aggregate based on the bamboo-based biochar and the cement-based waste. The surface property is improved; then mixing the materials, and preparing a regular and uniform aggregate blank by adopting a disc granulation method and accurately controlling the inclination angle and the rotating speed in combination with a reserved dry powder rolling and sticking process; finally, the blank is cured, particularly carbonization curing is adopted, and carbon dioxide and cement hydration products react to generate calcium carbonate to fill internal pores. According to the invention, interface bonding is enhanced through the modified charcoal, the porosity is reduced through carbonization curing, the prepared artificial aggregate has the advantages of high compressive strength and low water absorption, and high-proportion utilization of cement-based wastes is realized.

The invention discloses a chlorine salt corrosion resistant prestressed concrete solid square pile and a construction method thereof, a cementing material of a pile body concrete body of the square pile comprises a mineral admixture accounting for 50%-70% of the total mass of the cementing material, and the cementing material adopts Portland cement; sacrificial anode blocks electrically connected with the main reinforcements are embedded in the pile body concrete body. The pile body concrete body is doped with a composite corrosion-resistant and rust-resistant agent; the outer surface of the pile body concrete body is coated with polyurea waterproof paint or epoxy seal primer. An electromigration type corrosion inhibitor and a microcapsule containing bacillus are doped into the pile body concrete body; the prestressed main reinforcements are steel reinforcements with anti-corrosion coatings; and fiber bragg grating sensors are pre-embedded around the prestressed main reinforcements. The mixing proportion of the concrete body of the pile body is specially designed for fixing and blocking chloride ions, an inapplicable sulfate-resistant cement scheme is abandoned, and the chlorine salt resistance is improved from the source of materials.

The invention relates to the technical field of hydraulic concrete materials, and particularly discloses nano-modified anti-rebound full-hole slag sprayed concrete, which is prepared from the following raw materials in parts by weight: 665 parts of hole slag aggregate, 950 parts of hole slag sand, 396 to 436.5 parts of ordinary Portland cement, 225 parts of water, 10 parts of polycarboxylic acid type water reducing agent and 8.5 parts of accelerator, the hole slag aggregate is further modified by a nano admixture, and the nano admixture is composed of nano kaolin, nano silicon dioxide and a precise PCE solution. The springback-resistant shotcrete is prepared from the nano admixture modified hole slag aggregate, full-quantitative resource utilization of tunnel excavation hole slag is achieved, the problems of occupied area of piled slag and potential ecological pollution are effectively relieved, the cement consumption in the concrete is reduced, the construction cost is reduced, meanwhile, the springback rate of the shotcrete can be remarkably reduced, and the construction period is shortened. The compactness of the concrete is improved, and the compression resistance degree and the crack resistance of the concrete are enhanced.

The invention provides anti-erosion hydraulic concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete comprises the following components: composite cement, high-activity nano-modified metakaolin, blast furnace slag powder, low-calcium fly ash, coarse aggregate, natural river sand fine aggregate, granite machine-made sand fine aggregate, an erosion inhibitor, a functional additive, an early-strength polycarboxylic high-performance water reducer, a composite air entraining agent and the like. The composite cement comprises sulphoaluminate cement, Portland cement and polymer waterproof mortar. The high-activity nano modified metakaolin is obtained by modifying metakaolin with an organic silicon-ZnO composite emulsion and then drying. The erosion inhibitor comprises organic carboxylate, a hydrophobic-crystallization complexing agent and a pH buffer type corrosion inhibitor. The functional auxiliary agent comprises an itaconic acid and acrylic acid copolymer, a JRY-F concrete waterproof agent and polyethylene glycol-400 dilaurate. The composite air entraining agent comprises liquid sodium abietate and sodium alpha-olefin sulfonate. Through component synergism, modification and grading, an anti-erosion barrier is constructed.

The application discloses a self-repairing crystal anti-permeation high-durability cement-based material, a cement-based surface structure and a paving method thereof. The self-repairing crystal anti-permeation high-durability cement-based material comprises the following components in parts by weight: Portland cement 40-60 parts, wear-resistant aggregate 35-50 parts, water reducing agent 0.02-0.05 parts, retarder 0.2-0.5 parts, redispersible emulsion powder 1-2 parts, silica fume 1-2 parts, expanding agent 1-3 parts, chelating agent 1-6 parts and crystallization precipitant 1-6 parts; the total amount of the above components is 100 parts; the chelating agent is diethylenetriamine pentaacetic acid, and the weight ratio of the chelating agent to the crystallization precipitant is (0.5-2):1. The cement-based material has excellent self-repairing property, so that the strength, durability and anti-permeation property of the cement-based material are significantly improved.

The invention relates to the field of building materials, and discloses high-toughness and high-energy-absorption polymer emulsion modified mortar and a preparation method thereof, and the mortar is composed of ordinary Portland cement, river sand, a polymer emulsion, water, an active admixture and chopped fibers. Wherein the polymer emulsion is selected from styrene-acrylic emulsion (SBR), ethylene-vinyl acetate (EVA), polyurethane emulsion or a combination thereof; the mixing amount is 5-20wt% of the mass of the cementing material. According to the invention, a viscoelastic network is formed in a cement matrix through the polymer emulsion, and the synergistic effect of the active admixture and the chopped fibers is combined, so that the bonding strength, the crack resistance, the impact resistance and the stress wave dissipation capability of the mortar are remarkably improved. Test results show that the mortar provided by the invention is obviously superior to ordinary mortar in the aspects of 28d breaking strength, impact toughness and stress wave attenuation performance, and is suitable for high-performance constructional engineering and protective engineering.

The invention belongs to the technical field of negative carbon building materials, and particularly relates to a multi-element solid waste negative carbon cement-based material and a preparation method thereof. The material is prepared from the following components in parts by weight: 10 to 320 parts of carbonized carbide slag, 0 to 240 parts of uncarbonized carbide slag, 25 to 640 parts of calcined coal gangue, 25 to 800 parts of Portland cement, 6 to 320 parts of silica fume and other pozzolanic mineral admixtures and 30 to 800 parts of mixing water. The preparation method comprises the following steps: carbonizing the carbide slag until the content of calcium carbonate is more than or equal to 90%, and calcining and activating the coal gangue at 700-800 DEG C; all the powder raw materials are subjected to dry mixing, water is added for segmented stirring, and standard curing is performed after pouring forming. The carbonized carbide slag is used for replacing limestone to achieve carbon sequestration, the calcined coal gangue is used for replacing calcined clay, natural resources are prevented from being exploited, the cement clinker replacement rate of 70% is achieved through the synergistic effect of multi-element solid waste in a low clinker system, the material has excellent mechanical and durability, and carbon emission and resource consumption are remarkably reduced.

The invention discloses a carbide slag fly ash concrete aerated block and a preparation method thereof, and belongs to the technical field of resource utilization of building materials and solid waste. The aerated block comprises the following raw materials: carbide slag, fly ash, gypsum, Portland cement, aluminum powder paste, a nano core-shell structure calcium-aluminum-silicon polymer and a zwitterionic foam-stabilizing polymer, the raw materials have a specific weight part range. Wherein the nano core-shell structure calcium-aluminum-silicon polymer is prepared by dispersing fly ash in water to form slurry, reacting the slurry with sodium silicate and a sodium metaaluminate solution in sequence, then adding calcium nitrate and a zinc sulfate solution for continuous reaction, and carrying out separation, washing, drying and grinding; the zwitterionic foam-stabilizing polymer is prepared by polymerizing a monomer in a solvent, precipitating and separating out, quaternizing, activating carboxyl crosslinking, dialyzing and purifying, and freeze-drying. All the steps relate to process parameters such as dry mixing time, stirring time, curing temperature, pressure and time, and the performance of the aerated block is improved through component optimization and preparation process improvement.

The invention discloses marine concrete resistant to chlorine salt erosion and a preparation method thereof, and belongs to the technical field of building materials. The marine concrete is prepared from the following components in parts by mass: 280 to 350 parts of cementing material, 1100 to 1200 parts of aggregate, 150 to 180 parts of mixing water and 2.5 to 4.0 parts of high-efficiency water reducing agent, and the cementing material is prepared from 210 to 270 parts of ordinary Portland cement, 50 to 70 parts of superfine slag powder and 10 to 20 parts of modifier on the basis of the cementing material; on the basis of the modifier, the modifier is prepared from 30 to 45 parts of hexacalcium aluminoferrite, 25 to 35 parts of metaettringite, 20 to 35 parts of tobermorite, 3 to 6 parts of nano attapulgite and 2 to 4 parts of a nano composite material. The components can accelerate the early hydration of cement and the volcanic ash reaction process in the concrete hardening process, so that the concrete can form a compact microstructure in the curing period and cooperate with the curing effect of a hydration product on chloride ions, thereby remarkably improving the chloride ion penetration resistance of the concrete, prolonging the service life of the structure and improving the concrete quality. The method is suitable for port engineering, maritime work structures and buildings in salinized soil areas.

The invention relates to the field of solid waste co-processing and utilization, and particularly discloses complex-phase gypsum-based self-leveling mortar and a preparation method thereof. The mortar comprises the following raw materials in parts by mass: 75-95 parts of complex-phase gypsum, 3-25 parts of an auxiliary cementing material and 0.5-2.5 parts of an auxiliary mixture, the complex-phase gypsum comprises semi-hydrated gypsum, dihydrate gypsum and anhydrous gypsum; the auxiliary gelling material is a mixed compound material of ordinary Portland cement, aluminate cement, a calcium sulphoaluminate cementing material and sulphoaluminate cement; the additive mixture comprises one or more of a retarder, a water-retaining agent, a suspension / stabilizer, a water reducing agent, a flow promoter, a defoaming agent, a water repellent and an exciting agent. The gypsum-based self-leveling mortar prepared by the invention integrates the advantages of single semi-hydrated gypsum and single anhydrous gypsum, realizes the characteristics of high early strength and high later strength, and has the advantages of high strength, good wear resistance and low cost.

The invention discloses a self-repairing synchronous grouting material and a preparation method thereof, and belongs to the technical field of grouting materials. The self-repairing synchronous grouting material comprises a cement base material, a microbial capsule and chitosan calcium salt, the concrete comprises the following raw materials in parts by mass: 7-12 parts of Portland cement, 20-28 parts of fly ash, 40-55 parts of quartz sand, 20-30 parts of water, 2-7 parts of bentonite, 1-5 parts of microbial capsules and 1-5 parts of chitosan calcium salt. The self-repairing synchronous grouting material disclosed by the invention is combined with a microorganism self-repairing technology, and mineral substances such as calcium carbonate and the like can be generated through metabolic activity of microorganisms when the material has cracks, so that the cracks are automatically filled, and expansion of the cracks on the surface of a concrete material can be effectively prevented; the grouting material can continuously repair microcracks caused by environmental changes or construction stress in the long-term use process, and the integrity and stability of the structure are kept.

The invention belongs to the field of fiber reinforced composite materials, and provides an SCA modified basalt fiber cement base and a preparation method thereof.The preparation method comprises the following steps that basalt fibers are pretreated; a gamma-aminopropyltriethoxysilane solution, a gamma-glycidyl ether oxypropyltrimethoxysilane solution and a gamma-methacryloyloxypropyltrimethoxysilane solution are prepared, and the dried basalt fibers are soaked in the solutions respectively to be modified; naturally airing at room temperature after soaking, drying in an air dry oven, cooling to room temperature, and sealing and storing; carrying out dry mixing on the modified basalt fiber, ordinary Portland cement, sand and an additive to prepare an SCA modified basalt fiber cement base; by adopting different SCAs and introducing additional reaction functional groups, the interface bonding strength between the basalt fibers and a cement matrix is improved, and the problem of non-uniform fiber dispersion is solved, so that the comprehensive performance of the material is improved.

The invention relates to the technical field of building materials, and discloses ultra-high-performance concrete for buildings and a preparation method of a concrete plank. The ultra-high-performance concrete comprises the following components: 600-850 parts of a cementing material; 150 to 200 parts of silica fume; fine aggregate: 300 to 360 parts of coarse aggregate; 5 to 20 parts of synthetic anti-crack fiber; additives: 15-35 parts of a polycarboxylic acid high-performance water reducing agent and 0.5-3 parts of a defoaming agent; 5 to 15 parts of titanium dioxide; and 150 to 200 parts of water. The ultrahigh-performance concrete is prepared from ordinary Portland cement, silica fume, quartz sand aggregate, polypropylene fibers, a polycarboxylic acid high-performance water reducing agent, a defoaming agent, titanium dioxide and water, and nano silicon dioxide and a slow-release antibacterial agent are added, so that the ultrahigh-performance concrete with high toughness, high stability, high adaptability, high compressive strength, high flowability and antibacterial performance is obtained.

The application discloses a method for preparing auxiliary cementitious material and concrete products by carbonizing steel slag with industrial kiln tail gas, and steps are as follows: original steel slag is crushed, iron is removed, and screening is performed, so that a steel slag coarse-fine aggregate mixture and steel slag fine powder are obtained; the steel slag coarse-fine aggregate mixture is carbonized to obtain carbonized coarse aggregate and carbonized fine aggregate; the steel slag fine powder is ground to obtain steel slag micro-powder, the steel slag micro-powder is made into a cake to obtain a steel slag cake; the steel slag cake is subjected to carbonization treatment, and then is dried and ground to obtain a steel slag-based auxiliary cementitious material; the steel slag-based auxiliary cementitious material, silicate cement clinker powder and gypsum powder are mixed to obtain a new low-carbon cementitious material; the carbonized coarse aggregate, the carbonized fine aggregate, the new low-carbon cementitious material and sand are mixed and pressure-formed, and are subjected to carbonization treatment, so that a steel slag multi-stage carbonized product is obtained. The application effectively improves the carbonization rate and carbonization strength through the multi-stage carbonization technology, and avoids the occurrence of uneven carbonization caused by the fact that CO2 carbonization cannot reach the inside of particles.