36results about How to "Improve the interface transition area" patented technology

The invention discloses a road concrete material with high folding strength and a production method thereof. The road concrete material with high folding strength mainly contains binding agent, sand stone aggregate, mixing water, concrete admixture and excitant. The binding agent is composed of common silicate cement, ore slag powder and steel slag powder. The mass percentages of the components are as follows: 60-70% of common silicate cement, 20-30 % of ore slag powder and 0-10% of steel slag powder. The additional amount of the excitant is 5.0-10.0% of the total mass of the ore slag powder and the steel slag powder. The excitant is selected from gypsum, sodium sulfate, sodium fluoride, triethanolamine or a mixture thereof. By adding the excitant, the latent activity of the ore slag and the steel slag is excited, so that the compactness of concrete is improved and the folding strength of the road concrete is greatly improved.

The invention discloses an ultrahigh-strength self-compacting concrete and a preparation method thereof. The ultrahigh strength self-compacting concrete is mainly composed of a cementing material, an efficient water reducer, a fine aggregate, a coarse aggregate, water and PVA (Polyvinyl Alcohol) fibers, wherein the cementing material is composed of 70%-80% of common silicate cement, 10%-20% of mineral slag and 5%-10% of silicon powder by weight percentage; the fine aggregate is medium sand; the coarse aggregate is granite macadam. The ultrahigh-strength self-compacting concrete has the beneficial effects that the advanced techniques of the ultrahigh-strength concrete and the self-compacting concrete in the field of the concrete materials at present are studied, the advantages of the two concrete techniques are combined so that the dosage of the cement is reduced while ultrahigh performance of the concrete is realized, and furthermore, the purposes of emission reduction of CO2, materials saving and environmental protection as well as green construction are achieved.

The invention discloses modified recycled concrete and a preparation method thereof. The concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 235 to 260 partsof recycled aggregate, 145 to 165 parts of sand, 35 to 45 parts of water, 3 to 10 parts of silica fume, 0.5 to 2.5 parts of nano-silica, 0.5 to 2.5 parts of a water reducing agent, and 0.5 to 1.5 parts of cellulose ether. According to the modified recycled concrete and the preparation method thereof, the recycled aggregate is mechanically activated to remove particles and corners which can easilypeel off, so that the performance of the recycled aggregate is improved. Both nano-silica and silica fume have pozzolanic activity, can react with calcium hydroxide produced by cement hydration to form C-S-H gel, and can effectively improve the performance of the recycled aggregate concrete. The raw material components have a synergistic effect, and the obtained concrete has excellent mechanicalproperties and durability.

The invention relates to a low-shrinkage creep wet joint ultrahigh-strength concrete material and a preparation method thereof. The material comprises the following raw materials in proportion: 550kg/m<3> to 650kg/m<3> of cement, 150kg/m<3> to 250kg/m<3> of a mineral admixture, 675kg/m<3> to 825kg/m<3> of fine aggregate, 575kg/m<3>-725kg/m<3> of coarse aggregate, 10.3kg/m<3>-12.2kg/m<3> of a waterreducing agent, 78kg/m<3> to 156kg/m<3> of steel fibers, and 152kg/m<3> to 172kg/m<3> of water, wherein the mineral admixture is composed of an expanding agent and at least two of silica fume, superfine mineral powder, limestone powder, rice hull ash, metakaolin and fly ash microspheres, the coarse aggregate is any one or more of basalt, granite and diabase, the particle size is 5-10mm, and the needle sheet shape content is smaller than or equal to 1%. The low-shrinkage creep wet joint ultrahigh-strength concrete material prepared from the raw materials has the advantages of low shrinkage creep, good working performance, excellent mechanical properties, excellent durability and the like, is used for bridge wet joints, and can reduce the influence of shrinkage creep, guarantee the later durability and prolong the service life of bridges.

The invention discloses compound mortar with compound addition of carbon fibers and nano-silica and a preparation technology thereof. Raw materials are taken according to a certain weight ratio, water, a water reducing agent, carbon fibers and nano-silica are added into a container, stirred evenly and subjected to ultrasonic treatment at the temperature not higher than 30 DEG C to obtain a mixture, and then the mixture, cement and sand are added into a cement mortar stirring pot and evenly stirred to obtain a mix; the mix is poured into a mould, and the mould is placed on a vibrating table to be vibrated till slurry spills out of the surface; an electrode used for being connected with an external circuit is inserted into the mould according to the size of the mix in the mould; vibration is performed again; the mould is put into a curing box, and after curing is performed for 24 h under the conditions that the temperature is 20+/-1 DEG C and the humidity is larger than 95%, demoulding is performed to obtain a test piece. By combining the advantages of nano-silica and the advantages of carbon fibers and utilizing the reinforcement mechanism and synergetic reinforcement prompting effect of nano-silica and carbon fibers, the compound mortar with compound addition of carbon fibers and nano-silica is finally prepared and is good in fracture resistance and compression resistance and small in resistivity variation coefficient.

The invention discloses high-compressive-strength recycled concrete and a preparation process thereof. The high-compressive-strength recycled concrete comprises the following components in parts by weight: 300-420 parts of reinforced recycled aggregate, 25-35 parts of recycled micro powder, 100-200 parts of natural coarse aggregate, 120-200 parts of natural fine sand, 120-170 parts of cement, 50-130 parts of fly ash, 50-120 parts of mineral powder, 6-12 parts of a waterproof agent, 0.8-2.2 parts of an air entraining agent, 120-160 parts of water and 20-35 parts of polypropylene mixed filler. The preparation process comprises the following steps: S1, weighing corresponding amounts of cement and natural fine sand, putting the cement and the natural fine sand into a stirrer, and stirring for40-60 seconds; S2, weighing the regenerated micro-powder, the fly ash, the mineral powder and the polypropylene mixed filler according to corresponding proportions, adding the weighed materials into the stirrer in the step S1, continuing to stir and mix for 30-40 seconds, adding half of the water according to the proportion, continuing to stir for 30-40 seconds, and mixing to obtain mortar with uniform color; and S3, adding the rest half of the water, the reinforced recycled aggregate, the natural coarse aggregate, the air entraining agent and the waterproof agent according to the proportion in the step S2, and continuously stirring for 60-80 seconds until the mixture is uniform.

The invention discloses a modified high carbon ferro-chrome slag aggregate for road concrete and a preparation method of the modified high carbon ferro-chrome slag aggregate. The modified high carbon ferro-chrome slag aggregate is characterized by being prepared from a high carbon ferro-chrome alloy slag aggregate and a chemical modifying agent accounting for 2-6 percent of the mass of the high carbon ferro-chrome alloy slag aggregate through mixing, wherein the chemical modifying agent is prepared from 100 parts by mass of polymer diluting solution, 0.5-1.2 parts by mass of organic silicon waterproof defoaming agent, 0.2-0.5 part by mass of polyvinyl alcohol and 2-4 parts by mass of zeolite powder through uniform mixing; the polymer diluting solution is prepared by diluting a polymer emulsion stock solution through adding water; and the polymer emulsion stock solution is any one of a butylbenzene emulsion, a polyacrylate emulsion, a polyethylene-vinyl acetate emulsion and a styrene-acrylic emulsion. By adopting the invention, waste alloy waste is used as a raw material, and thus building materials of carbon chromic slag can be recycled and efficiently utilized, and the defects and the hidden dangers of the carbon chromic slag as the concrete aggregate are solved; and the preparation method is simple and easy to realize and is strong in practicability.

The invention relates to the technical field of concrete, and particularly discloses a preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete. The preparation method comprises the following steps: firstly, soaking original coral aggregate in a weak acid aqueous solution for micro-corrosion to obtain acid-treated coral aggregate, and then soaking the acid-treated coral aggregate in a basic magnesium sulfate cement-based slurry coating material prepared from active magnesium oxide, magnesium sulfate heptahydrate, citric acid and water to obtain modified coral aggregate; and preparing the basic magnesium sulfate cement-based coral aggregate concrete from the aggregate, active magnesium oxide, magnesium sulfate heptahydrate, citric acid and water as raw materials. Based on a core admixture and a gradient composite technology, the invention provides a method for enabling basic magnesium sulfate cement whiskers to grow in communicated pores of coral aggregate, and external pores of the coral aggregate are fully filled with gradient composite basic magnesium sulfate cement. The effects of reducing the overall porosity of the coral aggregate concrete, optimizing the concrete interface transition area and improving the working performance and the mechanical property of the concrete are achieved.

The invention discloses a wood nanocellulose modified cemented filling material for deep ground structure filling and a preparation method of the wood nanocellulose modified cemented filling material, and belongs to the technical field of mine filling materials. The wood nanocellulose modified cemented filling material is prepared from the following raw materials in parts by mass: 300 to 450 parts of cement, 100 to 150 parts of coal ash, 500 to 550 parts of fine aggregate, 1000 to 1200 parts of coal gangue, 0.3 to 0.6 part of modified wood nanocellulose and 400 to 500 parts of water, the modified wood nano cellulose is wood nano cellulose modified by cationic styrene-acrylic emulsion. By optimizing the formula and the preparation process of the mine filling material, the high-strength wood nanocellulose modified cemented filling material capable of being used for filling a deep ground structure is prepared, and a foundation is provided for the idea of reutilization of an underground space formed by a goaf.

The invention discloses a modified carbon fiber, a preparation method thereof and a modified carbon fiber reinforced cement-based material. The modified carbon fibers are carbon fibers with nano silicon dioxide and carbon nanotubes grown on the surfaces in situ. The preparation method of the modified carbon fiber comprises the following steps: (1) removing an epoxy coating on the surface of the carbon fiber; (2) oxidizing the surface of the carbon fiber; (3) performing in-situ growth of nano silicon dioxide on the surface of the surface-oxidized carbon fiber; and (4) growing carbon nanotubes on the surface of the product obtained in the step (3) in situ. The nano silicon dioxide and the carbon nanotubes simultaneously grow on the surfaces of the carbon fibers in situ, the modified carbon fibers combine the pozzolanic effect of the nano silicon dioxide and the bridging nucleation effect of the carbon nanotubes, and the modified carbon fibers are doped into the cement-based material, so that the interfacial strength of the carbon fibers and the cement-based material can be remarkably improved. Pores of the cement-based material are filled with the modified carbon fibers, so that the structure of the cement-based material is more compact, and the early-stage shrinkage performance of the cement-based material is effectively improved.

The invention relates to a device and method for strengthening recycled aggregate by means of CO2. The device comprises a reaction kettle with a kettle cover, a plurality of layers of stacked material frames are arranged in the reaction kettle, a gas inlet connected with a carbon dioxide steel cylinder is formed in the side of the reaction kettle, a pressurizing opening is formed in the kettle cover and connected with the carbon dioxide steel cylinder through a booster pump, and the kettle cover is further provided with an exhaust port and a vacuum opening connected with a vacuum pump. The device is simple in structure, convenient to install and maintain, convenient to clean and high in universality. By means of reaction of CO2 and recycled aggregate, the recycled aggregate is strengthened, basic properties of the recycled aggregate are improved, the water absorption rate and porosity of the recycled aggregate are reduced, the aperture is reduced, carbonization time is shortened, carbonization depth is increased, the treatment effect is improved, the yield is increased, and the equipment utilization rate is increased.

The invention discloses a process for preparing a water-permeable material for a landscaping pavement. The water-permeable material comprises a rubber layer, a water-permeable layer, a mortar layer and a matrix layer, wherein the matrix layer is formed by compression molding after uniformly stirring and mixing cement, solid waste coarse aggregate and solid waste fine aggregate; the water-permeablelayer is formed by compression molding after uniformly mixing cement, solid waste coarse aggregate and reinforcing fibers; the rubber layer is formed by mixing natural rubber, styrene butadiene rubber, white carbon black, silicon carbide, absorbent resin, a vulcanizing agent, an active agent and an ecological additive, casting the mixture on the water-permeable layer and carrying out vulcanizing;the coarse aggregate is formed by carrying out water quenching on high-temperature slag to form porous slag with a large internal pore diameter and then crushing the porous slag; the fine aggregate is formed by naturally cooling the high-temperature slag to form dense slag with a small internal pore diameter, and then grinding the dense slag into fine powder to be sintered into dense particles; and both coarse and fine aggregates are put into modification liquid for surface hydrophobic modification. The process provided by the invention uses solid wastes to prepare the water-permeable material which can be widely applied to water-permeable layers of pavements of sidewalks, parks and the like, and is beneficial to groundwater circulation.

The invention discloses an anti-ponding ecological rod surface for landscaping and a preparation method. The ecological rod surface is formed by pressing after mixing binder, reinforced fibers, coarseaggregate materials with larger internal bore diameter and fine aggregate materials with small internal bore diameter, and the coarse aggregate materials with the larger internal bore diameter and the fine aggregate materials with the small internal bore diameter are made of solid waste such as steel slag, ferrochrome slag and coal gangue after surface hydrophobic treatment. The ecological rod surface specifically comprises a base body layer, a permeable layer and a mortar layer, the base body layer comprises, by weight, 45-55 parts of composite binders, 120-180 parts of solid waste coarse aggregate, 100-120 parts of solid waste fine aggregate, 10-20 parts of addition agents, and 15-25 parts of water; the permeable layer comprises, by weight, 40-45 parts of the binder, 120-180 parts of the solid waste coarse aggregate, 80-120 parts of the reinforced fibers, 5-8 parts of the addition agents and 8-10 parts of the water; the coarse aggregate is formed by crushing multi-hole slag with thick internal bore diameter which is formed by water quenching high-temperature slag, and the fine aggregate is formed by burning fine powders formed by grinding dense slag with small internal bore diameter and the dense slag is formed by natural cooling the high-temperature slag. According to the anti-ponding ecological rod surface for the landscaping and the preparation method, solid waste is usedfor manufacturing seepage materials, and the anti-ponding ecological rod surface for the landscaping can be widely used in permeable layers of road surfaces.

The invention discloses preparation methods of chemical micro-corroded coral aggregate and geopolymer-based ultrahigh-strength coral concrete, and relates to the technical field of concrete. The preparation method of the aggregate specifically comprises the steps that coral coarse aggregate is placed and soaked in a phosphoric acid solution, taken out and directly dried to obtain chemical micro-corroded coral coarse aggregate; and after ball milling and sieving, compounding is performed by adopting a directional grading compounding method to obtain chemical micro-corroded coral sand. The coral coarse aggregate is subjected to micro-corrosion by using phosphoric acid, so that phosphate grows on the surface of the coral aggregate and in communicated pores in situ, and the porosity of the coral coarse aggregate is reduced. The chemical micro-corroded coral coarse aggregate is subjected to ball milling and screening to obtain chemical micro-corroded coral fine aggregate, and then the coral aggregate is compounded in a directional grading compounding mode to obtain coral sand with low void ratio and high close packing density. The concrete is prepared by taking the substance as aggregate and an alkali-activated active powder material as a cementing material, so that the effects of delaying the setting time of the geopolymer-based coral aggregate concrete, optimizing a concrete interface transition region and improving the mechanical property of the concrete can be achieved.

The invention discloses high-strength shrinkage-reducing cement mortar doped with steel fibers and floating beads and a preparation method of the cement mortar. The cement mortar is prepared from water, cement, silicon powder, metakaolin, quartz sand, saturated floating beads, the steel fibers and a polycarboxylate superplasticizer. The mass ratio of the water to the cement to the silicon powder to the metakaolin to the quartz sand to the saturated floating beads is 1042: 4168: 521: 521: (2800-4000): (286-859). The volume mixing amount of the steel fiber is 3%, and the mixing amount of the polycarboxylic acid type water reducing agent is 3% of that of the cementing material. The excellent water saturation and water release performance of the floating beads are combined, quartz sand is replaced with the floating beads, the problem of self-constriction of low-water-binder-ratio cement mortar is solved, meanwhile, it is guaranteed that the strength of the cement mortar is not greatly reduced, and good practical application value is achieved.

The invention belongs to the technical field of bank financial equipment manufacturing, and relates to a cement-based composite material with high drilling resistance used in bank financial equipment. The composite material is characterized by comprising the following components such as cement, siliceous dust, carborundum, an efficient water reducer, steel fiber and water at the weight ratio of 1:(0.10-0.20):(1.4-2.6):(0.005-0.010):(0.30-0.45):(0.23-0.29). The cement-based composite material is applied to the technical field of bank financial equipment, and has the following advantages that the carborundum with Mohs hardness up to 9.0 is taken as an aggregate so as to greatly improve the drilling resistance of the cement-based composite material; and the composite material is naturally cured without high-temperature steam or dry-heat curing procedure, thus simplifying the operating procedures, saving the energy cost and being applicable to large-scale production.

The invention discloses fiber-reinforced recycled aggregate pervious concrete, which is prepared by adopting the following formula: 270-350 kg/m < 3 > of cement, 355-450 kg/m < 3 > of water, 1360-1950 kg/m < 3 > of coarse aggregate, 35-100% of recycled aggregate, 0-30 kg/m < 3 > of polymer emulsion, 0-9.6 kg/m < 3 > of water reducing agent, 0-5 kg/m < 3 > of high-performance admixture, a water-binder ratio of 0.24-0.42, a slurry-bone ratio of 1: 3.8-1: 4.7, the maximum nominal particle size of the coarse aggregate is 5-20 mm, the maximum nominal particle size of the recycled aggregate is 5-20 mm, and the maximum nominal particle size of the recycled aggregate is 5-20 mm. The pervious concrete is prepared from the recycled aggregate, carbon emission in the whole life cycle of ground and pavement paving materials is further reduced, meanwhile, construction waste and solid waste are effectively utilized, the breaking strength and toughness of a pervious paving layer are greatly improved through the fiber reinforcement technology, a premixing mode is adopted for production in a breakthrough mode, the production efficiency is greatly improved, and the production cost is reduced. And the quality stability of a pervious concrete product is ensured to a greater extent.