42results about How to "Improves resistance to sulfate attack" patented technology

The invention relates to autoclaving-free prestressed high-strength tube pile concrete and a tube pile manufacturing method. The concrete is prepared from the following components in parts by mass: 300-420 parts of PI or PII 52.5 cement, 5-80 parts of mineral powder, 5-100 parts of lithium slag powder, 5-40 parts of glass microbead powder, 680-720 parts of sand, 1125-1170 parts of broken stones, 125-135 parts of water, 4-5 parts of a polyocarboxy acid water reducing agent and 2-5 parts of an exciting agent. After stirring and shaping are performed, only constant-pressure steaming is performed for 6-8 hours, the strength requirement of C80 can be met, the energy consumption is reduced, and besides, the lithium slag powder which is industrial waste is utilized for the autoclaving-free concrete tube pile, so that the problem of resource wasting and the problem of environmental pollution are solved to a certain extent.

The invention relates to magnesian sulphoaluminate cement, and a method of preparing a sheet material with the cement and a fiber-reinforced composite material, and belongs to the technical field of magnesian cement formulas and products. The magnesian sulphoaluminate cement mainly includes the following raw materials: light-burned magnesium oxide, magnesium sulfate, aluminum sulfate, calcined bauxite and water. The invention, compared with the prior art, has following beneficial effects: 1) the cement is high in strength; 2) the cement is low in alkali degree; 3) low-grade bauxite can be utilized so that a novel approach is developed for effective utilization and reasonable allocation of resources; 4) the cement is long in service life; and 5) the magnesian sulphoaluminate cement can be composited with plant fiber directly.

The invention discloses slag-limestone powder supplementary cementious material-based concrete and belongs to concrete. The water-binder ratio of the concrete is between 0.37-0.51, the concrete is prepared from the following components by weight percent: 14-20% of cementing materials, 27-33% of sand, 44-46% of pebbles, 7.1-7.4% of water and an additive accounting for 1.5% of cementious material; the cementing material is prepared by mixing the components by weight percent: 50% of ordinary portland cement, 30% of slag and 20% of limestone powder; and the specific surface area of the limestone powder is 350m<2> / kg, 450m<2> / kg or 650m<2> / kg. The slag-limestone powder supplementary cementious material-based concrete has the advantages that the concrete is prepared from slag-limestone powder as the supplementary cementious material of the portland cement, so that the mechanical property and the working performance of the concrete are improved, the endurance characteristics such as the freezing resistance, the anti-permeability and the sulfate corrosion resistance of the concrete are improved, the cement content is reduced, the hydration heat of the cement is further reduced, the concrete temperature rise is reduced, the material source is abundant, and the preparation cost of the composite cement and the concrete can be greatly reduced by adopting industrial wastes such as tailings and coal gangue and the raw materials such as abandoned stones and stone chips as raw materials.

The invention discloses an organic fluorosilicone and metakaolin concrete waterproofing fortifier and a preparation method and application thereof. The organic fluorosilicone and metakaolin concrete waterproofing fortifier contains the following ingredients (by weight): 30-50% of metakaolin, 3-5% of alkali-soluble resin, 5-15% of an organic fluorosilicone hydrophobic component, 0.1-1.0% of an emulsifier, 0.5-1.0% of a pH regulator and 30-50% of water, wherein the metakaolin is made into metakaolin powder with an alkali-soluble protective adhesive film. By mixing the metakaolin powder with thealkali-soluble protective adhesive film into an organic fluorosilicone oil-in-water emulsion with pH value being neutral, the organic fluorosilicone and metakaolin concrete waterproofing fortifier isprepared. Concrete with the application of the organic fluorosilicone and metakaolin concrete waterproofing fortifier as an additive has the following advantages: water absorption is obviously reduced; chloride absorption reduction rate, sulfate corrosion resistance and freezing and thawing cycle resistance of the concrete are remarkably raised; and durability of the concrete is obviously enhanced.

The invention discloses a liquid concrete activator which is made from the following raw materials according to mass percentage: superplasticizer 10-60%, aluminum sulfate 5-20%, triethanolamine 0.05-0.2%, slump-retaining agent 0-6%, gas content regulator 0-0.4%, hydroxyl compounds 0-0.02%, and water 30-77%. With the use of the inventive liquid concrete activator, the addition amount of ground slag in concrete is increased from 20-40% to 50-70% and the solidification and curing of concrete with a large amount of ground slag are accelerated, so that the concrete is similar in curing time and early strength to the common concrete, thereby facilitating the construction application. The invention can reduce the requirement for cement in concrete material, and also greatly improve the durability of concrete (e.g. resistance to sulphate corrosion and chloride ion corrosion) since the additional amount of ground slag in the concrete system is increased.

The invention discloses a patching material for preventing and treating the corrosion and the disease of a tunnel lining concrete salt. The patching material consists of ordinary portland cement, a silica alumina mineral component, an expansion component, a rubber mass polymer component, polyacrylonitrile fiber and a condensation adjusting component, wherein the mass ratio of the components is 60:30:8:2-3:0.3:2-4. The patching material can be used for effectively patching, preventing and treating the corrosion and the disease of the tunnel lining structural salt, obviously improving the endurance quality of the existing disease tunnel structure, and prolonging the service life of the tunnel structure, and has the characteristics of being high in cost performance, simple to operate and good in adaptability.

The invention provides high performance concrete prepared from waste slag powder, and relates to the technical field of concrete pipes. The high performance concrete prepared from the waste slag powder is prepared from the following raw materials: waste slag powder, modified hydrotalcite, modified polypropylene, polycarbonate, glass fibers, an anti-stress cracking agent, and water. With the addition of all raw materials of the high-performance concrete, the mechanical and working performance of the concrete is improved, the frost resistance, impermeability, sulfate corrosion resistance and other durability properties of the concrete are increased, the waste slag powder material has abundant sources, and can take tailings, coal gangue and other industrial waste slag and waste rock materialsand stone chips produced in the production process of machine-made sand as raw material; the production cost of the concrete is greatly reduced, a large amount of industrial waste slag can be used, the environment is improved, the pollution is reduced, the energy is saved, and good social and economic benefits are generated.

The invention discloses a liquid concrete activator which is made from the following raw materials according to mass percentage: superplasticizer 10-60%, aluminum sulfate 5-20%, triethanolamine 0.05-0.2%, slump-retaining agent 0-6%, gas content regulator 0-0.4%, hydroxyl compounds 0-0.02%, and water 30-77%. With the use of the inventive liquid concrete activator, the addition amount of ground slag in concrete is increased from 20-40% to 50-70% and the solidification and curing of concrete with a large amount of ground slag are accelerated, so that the concrete is similar in curing time and early strength to the common concrete, thereby facilitating the construction application. The invention can reduce the requirement for cement in concrete material, and also greatly improve the durability of concrete (e.g. resistance to sulphate corrosion and chloride ion corrosion) since the additional amount of ground slag in the concrete system is increased.

The invention discloses a high efficiency sulfate attack resistant concrete additive and a preparation method thereof. The technical scheme of the concrete additive comprises the following raw materials in parts by weight: 15-25 parts of barium salt, 5-10 parts of sorbitol, 15-30 parts of calcined diatomaceous earth, 0.5-1.0 part of a grinding aid, 30-50 parts of silica fume, 10-20 parts of ultrafine fly ash and 1.0-2.0 parts of a water reducer. The high efficiency sulfate attack resistant concrete additive can reduce the proper shrinkage cracks of concrete, improve the compactness, and greatly improve the multi-type attack resistant properties of the concrete effectively for a long time.

The invention discloses high-durability concrete, and relates to the technical field of building engineering construction, and each cubic meter of the concrete comprises the following raw materials: 273-293 kg / m < 3 > of cement, 340-450 kg / m < 3 > of a cementing material, 703-710 kg / m < 3 > of sand, 1064-1099 kg / m < 3 > of stone, 9.66-10.35 kg / m < 3 > of an additive, 0.9-1.2 kg / m < 3 > of polypropylene fiber and the balance of water. The cementing material comprises 105-113kg / m < 3 > of fly ash, 42-45kg / m < 3 > of S95 mineral powder and 29-32kg / m < 3 > of a waterproof agent; according to the scheme, the sulfate corrosion resistance, the early-stage crack resistance and the chloride ion penetration resistance of the concrete are improved by preparing the concrete combination proportion, and the durability of the concrete is enhanced.

The invention relates to a magnesia sulfoaluminate cement composition as well as a product and a manufacturing method thereof. The composition comprises light calcined magnesia, magnesium sulfate heptahydrate, calcined bauxite, phosphoric acid or phosphate and water. The composition and the cement product thereof have the advantages that (1) the cement is high in strength; (2) the alkalinity of the cement is low; (3) the cement can utilize low-grade bauxite, so that effective utilization and reasonable allocation of resources can be realized; (4) the service lifetime of the cement product is long; and (5) the cement can be directly compounded with a fiber material to prepare fiber reinforced magnesia cement products meeting various requirements.

The invention relates to autoclaving-free prestressed high-strength tube pile concrete and a tube pile manufacturing method. The concrete is prepared from the following components in parts by mass: 300-420 parts of PI or PII 52.5 cement, 5-80 parts of mineral powder, 5-100 parts of lithium slag powder, 5-40 parts of glass microbead powder, 680-720 parts of sand, 1125-1170 parts of broken stones, 125-135 parts of water, 4-5 parts of a polyocarboxy acid water reducing agent and 2-5 parts of an exciting agent. After stirring and shaping are performed, only constant-pressure steaming is performed for 6-8 hours, the strength requirement of C80 can be met, the energy consumption is reduced, and besides, the lithium slag powder which is industrial waste is utilized for the autoclaving-free concrete tube pile, so that the problem of resource wasting and the problem of environmental pollution are solved to a certain extent.

The invention discloses an anti-erosion concrete admixture and a preparation method thereof, belonging to the technical field of building materials. The concrete admixture is prepared from 30-50 parts of fly ash, 10-20 parts of superfine slag powder, 5-10 parts of a modified expanding agent, 5-10 parts of a water reducing agent and 3-8 parts of a grinding aid component. According to the invention, erosion resistance is realized through two dimensions; firstly, the fly ash and the superfine slag powder are added, so formation of sulfate erosion products is effectively prevented from a chemical level; secondly, fine gaps of a cement material are fully filled with the expanding agent and other components, so the compactness of the material is increased, and the overall strength of the material is improved; and the superfine slag powder and the modified expanding agent cooperate with each other, so the sulfate attack resistance of the material is jointly improved. The additive is low in addition amount; the preparation method is simple; a test piece still meets use requirement after being eroded by high-concentration sulfate for 120 days; and thus, the additive has wide market prospects.

The invention provides a sulfate-corrosion-resistance concrete additive and a preparation method thereof, belonging to the technical field of construction materials. The concrete additive is characterized by comprising the following raw material components in percentage by weight: 15 to 50 percent of silicate cement clinker, 40 to 80 percent of ground slag, 1 to 5 percent of zeolite powder, 1 to 3 percent of barium nitrate, 0.5 to 2 percent of polyoxyethylene ether, and 0.5 to 2 percent of vinyl resin, wherein the mixing amount of a gel material in the concrete is between 5 and 8 percent. Thepreparation method comprises the following steps of: uniformly mixing the barium nitrate, the polyoxyethylene ether and the vinyl resin according to proportions; grinding in a grinder to prepare mixture, wherein the degree of powder is between 400m<2> / kg and 500m2 / kg; and uniformly mixing the mixture, the silicate cement clinker, the ground slag and the zeolite powder into a stirring vessel according to the proportions and evenly stirring to obtain the finished product. By the sulfate-corrosion-resistance concrete additive and the preparation method thereof, the sulfate corrosion resistance of concrete can be remarkably improved, the raw materials are easily obtained, and the preparation process is simple.

The invention relates to an anti-erosion agent for concrete, a preparation method and an application thereof. The anti-erosion agent comprises the following components in parts by weight: 100 parts of original-state superfine fly ash microsphere, 5-9 parts of water reducer, 30-80 parts of expanding agent, 0.075-0.3 part of air entraining agent, 25-75 parts of bulking agent and 0.37-1.25 parts of retarder. Compared with the prior art, the product of the invention utilizes the original-state superfine fly ash microspheres and has excellent performance, the production process is simple, the application is convenient, the applicability is universal, and the application effect is extremely standout. As for the concrete prepared by adopting the product of the invention, the anti-sulphate-erosion ability thereof can be improved by 5-8 times, the anti-chloridion-penetrating ability can be improved by more than 3 times, and the service life of the concrete structure can be prolonged by 3-4 times under the condition that the service environment of the concrete structure is not changed.

The invention discloses a modified limestone powder, a preparation method thereof and concrete, which is made of 94-97% of limestone powder, 1% of a physical modifier and 2-5% of a chemical modifier according to the mass percentage, wherein the The above-mentioned chemical modifier is a mixture of oxalic acid, phosphorus tailings and polyferrosilicon flocculant. The physical and chemical double modification of the limestone powder solves the problem of sulfate erosion of limestone powder concrete in the prior art, and the obtained modified limestone powder has high density, low porosity, and excellent resistance to sulfate erosion.

The invention discloses an alkali-free concrete surface protective agent and a preparation method thereof. The raw material composition of the surface protective agent is calculated by mass percentage: 20%-30% of modified fluosilicic acid; 2%-8% of hydrofluoric acid, Chelating agent 2% to 4%, complex surfactant 0.5% to 1.5%, pH regulator 1% to 5%, and the balance is water; first prepare modified fluosilicic acid, add water and stir, then add hydrofluoric acid, Chelating agent, composite surfactant, finally add pH regulator, adjust the pH value to 2-3, the obtained colorless transparent liquid is the concrete surface protective agent; the invention can effectively improve the compactness of the concrete surface, and significantly reduce the concrete surface The depth of carbonation can improve the concrete's ability to resist sulfate attack and rebound strength. The protective agent is convenient to use, has strong operability and is easy to popularize.

The invention provides a microbial immobilization method for self-repairing concrete cracks, which belongs to the cross-technical field of microbiology and civil engineering materials, including: immobilizing microorganisms or microbial spores in a carrier, and performing an external encapsulation process; The secondary fixation process in which nutrients are loaded in the above-mentioned carrier; and the pre-embedding process in which the fixed carrier obtained from the above-mentioned secondary fixation process is mixed with concrete raw materials; the above-mentioned carrier is coral reef calcareous sand; the above-mentioned nutrients include 3 ,5‑Dinitrobenzyl alcohol and sodium trimetaphosphate. The method provided by the invention can increase the survival rate of microorganisms; it can increase the crack repair width (the maximum repair width reaches more than 1mm, and the average repair width reaches 0.7-0.9mm), and the concrete compressive strength recovers more than 80%; it can effectively reduce sulfate erosion Reduce the loss of concrete compressive strength after repair, improve the sulfate corrosion resistance of repaired concrete, and increase the durability of concrete.