243results about How to "Rapid development of strength" patented technology

A process for producing blended cement in which the cement contains Portland Cement mixed thoroughly with a microfiller, and possibly a water reducing agent, to provide a dry cement mixture, and fine supplementary cementitious materials selected from the materials blast furnace slag, fly ash, quartz, silica, amorphous silicon dioxide, limestone, and recycled concrete. The supplementary materials are first subjected to a grinding step in a dry state to a specific surface of at least 1000 cm²/g (Blaine). In a second step the ground supplementary materials are subjected to a grinding step together with at least 20% by weight of the total grinding mass of a highly reactive cement mixture in a dry state, to achieve a specific surface of at least 3000 cm²/g (Blaine).

The invention discloses concrete healant, which comprises following components by weight percent: 30 to 55 percent of gelatinization materials, 40 to 65 percent of fine aggregates, 0.1 to 0.5 percent of water reducing component, 0.05 to 0.5 percent of early-strengthening component, 0.05 to 0.2 percent of delayed-coagulation component, 0.2 to 1.0 percent of nano materials, 0.5 to 1.0 percent of high-activity substances, 0.01 to 0.2 percent of water retention thickening component, 0.2 to 2.0 percent of polymer and 0.02 to 0.2 percent of defoaming agent. The concrete healant not only has characteristics of good mobility, fast strength development, high adhesion strength and small retraction, but also can fill active substances into original concrete gaps and can produce compact crystals, so that the cohesion strength of the new and the old concrete interfaces can be remarkably improved, and the concrete healant is applicable to the concrete mending projects of bridges, caves, industrial workshops and civil construction.

[Object] To provide a cement dispersant and a concrete composition containing the cement dispersant, the cement dispersant having a superior effect of decreasing a high concrete paste viscosity while a water reducing effect, a slump flow retention, and rapid strength development are being satisfied in a region having a low water/binder ratio.

[Solving Means] The cement dispersant for ultrahigh performance concrete is provided which is a water-soluble amphoteric copolymer obtained by copolymerizing (A) an alkylene oxide adduct of a polyamide polyamine having an unsaturated group, (B) (meta)acrylic acid or a salt thereof, (C) an ester of a short-chain alkylene glycol and (meth)acrylic acid, and (D) an ester of a long-chain alkylene glycol and (meth)acrylic acid at ratios A:B:C:D of 5 to 25:5 to 30:5 to 40:20 to 80 (percent by weight), in which the total is 100% percent by weight. In addition, the concrete composition containing the above cement dispersant is provided.

The invention provides a reinforced concrete column replacing and reinforcing method and a device for unloading the load of a reinforced concrete column, belonging to the technical field of buildings. The invention solves the problem that after the existing reinforced concrete column has a quality problem, the reinforcing and repairing works are relatively difficult. The reinforced concrete column replacing and reinforcing method mainly comprises the steps of material preparation, unloading, chiseling, erection of shuttering, replacement and removal of shuttering. The device for unloading the load of the reinforced concrete column comprises a supporting column which can be supported on the beam of the current layer, and hydraulic lifting mechanisms capable of lifting the supporting column are arranged at the two sides of the supporting column. The reinforced concrete column replacing and reinforcing method has the advantages that the original size of the column section can not be changed, and reinforcing traces can not be left. The device for unloading the load of the reinforced concrete column, which adopts hydraulic unloading, has the advantages of large applied force and uniform application of force.

The invention discloses high temperature resistance low-density high-strength cement paste which consists of the following components in parts by weight: 100 parts of cement, 23 to 35 parts of lightening admixture, 30 to 40 parts of high temperature strength stabilizer, 10 to 23 parts of filler, 1.5 to 2 parts of dispersing agent, 1 to 2 parts of early strength agent and 8 to 15 parts of fluid loss agent, wherein hollow microspheres are used as the lightening admixture; the high temperature strength stabilizer is high-activity silicon powder; the filler is micro silicon; the dispersing agent is an aldehyde ketone condensation product or a naphthalene dispersing agent; the early strength agent is formed by blending two or more of the following components: sulfo-aluminium sulfate, sodium silicate, basic aluminium chloride and the like; and the fluid loss agent is a sulphonated acetone-formaldehyde condensation product. The low-density cement paste can be used for well cementation of a heavy oil thermal recovery well on a low-pressure formation which is easy to leak, the strength recession of cement stones, which is caused by the high temperature, can also be greatly reduced, and the service life of the oil well is prolonged.

The invention discloses a concrete material which totally adopts industry solids waste to replace cement preparation, comprising a gelled material and a skeletal material. The gelled material is composed of the components with the following weight portions of 36 to 75 portions of fluidized bed burning coal solid sulfur clinker, 9 to 25 portions of acetylene sludge and 6 to 15 portions of phosphogypsum; because the cementing materials such as cement, lime, asphalt, and the like, are not needed at all, material costs are remarkably reduced, great amount of industry solids waste is used to produce building materials, especially the fluidized bed burning coal solid sulfur clinker is used to serve as raw material, environment pollution is avoided, and land resources are saved.

The invention belongs to sea deep water complex well cementing which is suitable for low temperature, tending to superficial water-gassed-out. The mineral components and mass percent composition are: 23-45 wt.% of tricalcium silicate, 12-25 wt.% of calcium sulphoaluminate, 15-23 wt.% of dicalcium silicate, 3-10 wt.% of gypsum, 4-8 wt.% of calcium carbonate, and residual celite, calcium aluminate and other microelement. The using process of the deep water complex well cementing includes: adding 0-3 wt.% of coagulant, 0-1.2 wt.% of retarder, 15-45 wt.% of hollow microglobin and water to prepare a low density cement slurry system of 1.35-1.60g/cm3 which has a controllable gelled time and has a perfect right-angle gelling capacity, a set cement volume microdilatancy and develops fast at low temperature. The inventive deep water low temperature complex well cementing has a high early strength, a short curing time, a powerful channeling-preventing ability, and microdilatancy, which provides a powerful guarantee to improve the deep water complex well quality.

This invention relates to a method for producing construction gypsum powder from ardealite. The method comprises: (1) prehomogenizing ardealite waste residue, placing in a continuous high-efficiency calcining kiln, and calcining; (2) taking out and aging naturally for 7-15 d; (3) milling into 100-200 mesh powder. This invention uses a unique calcination technique to produce high performance construction gypsum from ardealite waste residue, and has such advantages as no secondary pollution and saved water resource.

The invention relates to a deepwater cementing low-temperature early strength agent. The low-temperature early strength agent comprises the following components in percentage by weight: 33 to 66 percent of alkali metal bromides, 6 to 16 percent of sodium metaaluminate, 15 to 35 percent of alkali metal hydroxides, 8 to 15 percent of silicon dioxide and 0.8 to 1.5 percent of alcamines organics, wherein the alkali metal bromides are a mixture of one, two or more of NaBr, KBr and LiBr; the alkali metal hydroxides are NaOH, KOH or a mixture of the NaOH and KOH; and the alcamines organics are triethanolamine, triisopropanolamine or a mixture of the triethanolamine and triisopropanolamine. The deepwater cementing low-temperature early strength agent has small influence on rheological behaviour of cement paste at low temperature, can prompt the cement paste to be solidified rapidly at low temperature and reach higher early strength, shortens the thickening time of the cement paste at lower temperature and can well meet the requirements of the cementing construction of a surface casing under the conditions of low temperature, shallow gas and the like.

The invention discloses an alkali slag foamed concrete which comprises slag and an alkali activator, wherein the alkali activator is sodium hydroxide or water glass. When the alkali activator is sodium hydroxide, the alkali slag foamed concrete is composed of the following components in parts by mass: 59-65 parts of slag, 5-6% of NaOH, 23-26 parts of water and 4.8-12.2 parts of foaming agent. When the alkali activator is water glass, the alkali slag foamed concrete is composed of the following components in parts by mass: 56-61 parts of slag, 9-11 parts of water glass, 21-25 parts of water and 5.0-12.2 parts of foaming agent. The volume weight of the foamed concrete is 290-610 kg/m<3>. The alkali slag foamed concrete has the advantages of short setting time, quick strength development, higher later strength, excellent water resistance and excellent weather resistance, and can be used for a long time.

The invention discloses a preparation method of high-performance carbonized reinforced concrete, and the method comprises the following steps: mixing steel slag, a hydraulic cementing material, a carbonized reinforced phase and quartz sand, adding water and a water reducing agent, stirring, and carrying out casting molding on the stirred slurry; sealing and maintaining the molded product for 12-24hours, removing a mold, and carrying out drying pretreatment; and putting the dried product into a carbonization kettle with a CO2 atmosphere and an air pressure of 0.1-0.5 MPa, and carrying out carbonization maintenance for 12-24 hours to obtain a steel slag product. The high-performance carbonized reinforced concrete prepared by the invention has excellent working performance; the hydrated andcarbonized synergistic effect of the hydraulic cementing material and the steel slag is fully utilized, the compressive strength can reach 100 MPa within a short time, meanwhile, the utilization rateof the steel slag is remarkably increased, a large amount of CO2 can be solidified and stored, huge environmental benefits are achieved, development of green building materials is facilitated, and a sustainable development road is achieved.

In one embodiment, the invention is an composition comprising: a) one or more isocyanate functional polyether polyurethane prepolymers; and b) one or more prepolymers of one or more polyisocyanates and one or more polyesters wherein the terminal groups on the polyester polyol polyurethane prepolymer are the residue of a monofunctional polyalkylene glycol (hereinafter capped polyester polyurethane prepolymer) or one or more polyester polyols which are capped with the residue of one or more monofunctional isocyanates (hereinafter isocyanate capped polyesters); wherein the composition is a low viscous paste at temperature of from about 40 to about 80° C. and is high viscous paste at a temperature of from about 40° C. or less. In a preferred embodiment the composition further comprises c) one or more catalysts for the reaction of isocyanate moieties with hydroxyl groups. In another embodiment the invention is a method of bonding two or more substrates together which comprise contacting the two or more substrates together with a composition according to this invention disposed along at least a portion of the area wherein the substrates are in contact wherein the composition is a low viscous paste. In a preferred embodiment the composition is heated to about 40° C. to about 80° C. and converted to a low viscous paste prior to contacting it with the one or more substrates.

The invention relates to a cementing slurry system suitable for large range of temperature. The cementing slurry system comprises the following components in parts by weight: 100 parts of cement, 0-40 parts of high temperature stabilizer, 2-6 parts of filtrate reducer, 0.3-3 parts of retarder and 40-55 parts of water, wherein the cement is G-grade high sulfate-resistant oil well cement; the filtrate reducer is 2-acrylamido-2-methylpropane sulfonic acid (AMPS)-acrylamide polymer, the molar ratio of AMPS to acrylamide polymer monomer is 7:3 and the number average molecular weight is 0.7-1.5 millions; the retarder is a diethylenetriamine derivative with carboxyl groups, phosphate groups and sulfonate groups, the molar ratio of the carboxyl groups to the phosphate groups and sulfo groups is 3:2:1; and the high temperature stabilizer is amorphous silica of which purity is more than 95% and average diameter is 0.1-0.15 micron. The circulating temperature range of the cementing slurry is 70-180 DEG C; under high temperature, the cementing slurry has good slurry stability, low fluid loss water amount and no free liquid; and the cementing slurry system can meet the deep well cementing construction requirement and can be used to increase the cementing quality.

The invention discloses a method for maintaining porous concrete through carbon dioxide. The method includes the following steps: (1) concrete is mixed and formed; (2) an obtained initial concrete body is placed into a pre-maintenance device for pre-maintenance, wherein the pre-maintenance temperature ranges from 15 DEG C to 25 DEG C, and the relative humidity ranges from 50% to 70%; air circulates through an air blower or a fan, wherein the pre-maintenance time ranges from 1 h to 18 h; (3) when the residual water-cement ratio of the mixed material body obtained after pre-maintenance reaches a preset residual water-cement ratio, the mixed material body is placed into a CO2 maintenance container, vacuumizing is carried out, then CO2 gas is led into the CO2 maintenance container for CO2 maintenance, the gas is discharged after maintenance is completed, and maintenance is stopped. By means of the method, control over the moisture content of the concrete body can be achieved, the carbon dioxide gas absorption capacity of the concrete can be effectively improved, and the quality of a concrete product can be effectively improved; in addition, the waste greenhouse effect gas, namely the carbon dioxide gas can be effectively used, the emission of the greenhouse gas can be reduced, the environment can be protected, and the greenhouse effect can be suppressed.

The invention relates to a novel heat-insulation fireproof porous concrete and a preparation method thereof. The novel heat-insulation fireproof porous concrete has the characteristics of porous property, light weight, low heat conduction coefficient, high strength, good heat insulation effect and high temperature resistance, and belongs to the technical field of fireproof building materials. The novel heat-insulation fireproof porous concrete uses a large amount of industrial waste residue, accords with energy saving and environmental protection requirements, and is deeply and widely concerned in the building industry. Porous concrete with the density of 450-600Kg/m<3> and the anti-compression ability reaching 10MPa is prepared through using Portland cement as a binder, using fly ash and expanded perlite to substitute sand and parts of cement and adding a polypropylene fiber. High-strength porous concrete with the density of 600-800Kg/m<3> and the anti-compression ability reaching 20-30MPa is prepared by adopting an expanded perlite and polypropylene fiber doping technology. Porous concrete prepared by using cement, fly ash, an organic fiber and a self-made composite foaming agent has flow state characteristics, can be conveniently casted in mass, has a heat conduction coefficient of below 0.06J/K.M and a water absorption rate of below 10%, and provides technical support for the preparation of high-performance porous concrete heat insulation wall materials.

The invention relates to an inorganic fiber reinforced composite material which is characterized in that the composite material is prepared by magnesium oxide, phosphate, a retarder, short fibers, fillers and water according to a certain weight ratio; the composite material can be used to produce various products by mold pouring or pressure molding, and the operation is simple and convenient; the composite material has the advantages and effects of good mechanical properties, good density, acid and base corrosion resistance, nontoxicity, environmental protection, low cost and wide applications; and the inorganic fiber reinforced composite material has low cost, high strength, and good toughness, is applicable to industrial batch production, is suitable for producing pipes, tanks, decoration materials, handicrafts, fireproof doors and windows and the like with various shape specifications, and can substitute wood, metal, and plastics in many aspects.

The invention relates to an oil well cement paste system for preventing high-temperature strength retrogression and a preparation method thereof in the field of oil and gas field well drilling and cementing. The system comprises, by weight, 100 parts of cement, 25-45 parts of silica fume, 0-6 parts of a fluid loss agent, 0-5 parts of a retarder, 1-10 parts of a strength enhancer, 0.5-5 parts of asuspension stabilizer and 40-60 parts of water. The strength enhancer in the system is liquid, is low in dosage, can accelerate the strength development of set cement, and greatly improves the strength of the set cement without strength retrogression at high temperature. The system has a wide popularization and application prospect.