196results about How to "Reduce water-cement ratio" patented technology

The invention discloses a preformed material for post-tensioned prestressing pipeline vacuum grouting or mudjacking and a preparation method thereof. The preformed material includes the following components by weight percent: 65 to 95 percent of silicate cement, 0.01 to 3 percent of high-range water-reducing agent, 0 to 1 percent of stabilizing agent, 0.05 to 5 percent of retarding agent, 1 to 20 percent of expanding agent, 0.2 to 2 percent of corrosion inhibitor, 0.01 to 1 percent of air entraining agent and 0 to 30 percent of mineral materials, wherein by uniformly and proportionally mixing the silicate cement, the high-range water-reducing agent, the stabilizing agent, the retarding agent, the expanding agent, the corrosion inhibitor, the air entraining agent and the mineral materials, the post-tensioned prestressing pipeline vacuum grouting or mudjacking preformed material can be obtained. After being uniformly mixed and stirred with water with neutral pH value according to the water cement ratio ranging from 0.24 to 0.32, the preformed material can be used, the obtained grouting material has the advantages of low water cement ratio, favorable flowability, no water bleeding and delamination, and favorable pumpability; meanwhile, the preparation method of the preformed material is simple and the raw material sources of the preformed material are wide.

The invention relates to the technical field of building material, in particular to a maritime work concrete corrosion-proof additive. The maritime work concrete corrosion-proof additive consists of a calcium sulphoaluminate expansion agent, a methyl naphthalene sulphonic acid water reducing agent, organosilicon hydrophobic powder, neopentylene glycol, milled slag powder, polypropylene fibers, silicon ash, superfine fly ash and arenaceous quartz. The maritime work concrete corrosion-proof additive can reduce the water consumption for mixing concrete, improve the water retention and cohesiveness, and improve the resistance of the concrete to seawater erosion and the durability.

The invention relates to high-strength lightweight aggregate concrete and a preparation method thereof, and belongs to the technical field of building material concrete. The lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 105-118 parts of cement, 180-185 parts of light coarse aggregate, 120-125 parts of fine aggregate, 65-70 parts of mineral admixtures, 9-24 parts of modified polypropylene fiber, 3.4-3.8 parts of concrete admixtures and 65-70 parts of water. The preparation method comprises the following steps that the raw materials are weighed according to the formula ratio, the light coarse aggregate is added into water accounting for one half of the total water amount for pre-wetting for 45-60 minutes, then the fine aggregate is added, stirring is carried out for 1-2 minutes, the cement, the mineral admixtures and the modified polypropylene fiber are continuously added, uniform stirring is carried out, then the concrete admixtures andthe rest water are added, and uniform stirring is carried out so as to obtain the high-strength lightweight aggregate concrete. The high-strength lightweight aggregate concrete and the preparation method thereof have the advantages that the strength is high, and the quality is stable.

The invention discloses foam concrete. The foam concrete comprises following raw materials in parts by mass according to a formula: 210-300 parts of cement, 1.0-1.5 parts of a water reducing agent, 5.1-5.5 parts of an early strength agent, 2.1-2.9 parts of a coagulant, 1.7-3.4 parts of fibers, 12-20 parts of a chemical foaming agent, 0-90 parts of superfine slag powder and 100-160 parts of water, wherein the superfine slag powder is formed by aluminosilicate glass particles smaller than 15 mu m, and the specific surface area is 450-500 m<2>*kg<-1>. The compressive strength of the foam concrete is improved on the premise that the foam concrete keeps low density.

The invention provides environment-friendly high-performance cement which is characterized by consisting of the following raw materials in parts by weight: 50-60 parts of admixture, 32-40 parts of cement clinker, 6-8 parts of gypsum, 0.03-0.05 part of grinding aid, 3-5 parts of excitation substance, 0.05-0.1 part of antifoaming agent, 0.05-0.1 part of plasticizer, 0.03-0.05 part of anti-precipitating agent and 0.2-0.4 part of water reducing agent. In the environment-friendly high-performance cement provided by the invention, a large mixing amount of cement slurry can be realized by adopting a mechanical-chemical excitation production process, a great quantity of industrial waste residues can be consumed, the yield is increased, and the production cost is lowered; moreover, by adding a functional additive, the performance of the product is improved, and the needs of civil engineering are met.

The invention discloses a light-silicon fiber crack-proof reinforcer of concrete in the making domain of organic and inorganic material, which comprises the following parts: anhydrous calcium sulphoaluminate, raw alunite, ripe alunite, anhydrite, naphthalene-system high-effective dehydragent, grammite, polypropylene fibre, sodium lignosulfonate and coal ash. The invention confers high-density and superior constructing property for concrete with modified boundary structure and high-concrete compactness, strength and durability, which improves stretching resistance greatly.

The invention relates to a magnesium oxysulfate wall plate and a fabrication method of the magnesium oxysulfate wall plate. The magnesium oxysulfate wall plate comprises the following raw materials in parts by weight: 100 parts of magnesium oxide, 0.5-5 parts of a modifier, 100-130 parts of a magnesium sulfate solution, 2 parts of bamboo fiber, 3 parts of palm fiber, 10-30 parts of a filling and 1 part of a foaming agent. The fabrication method of the magnesium oxysulfate wall plate comprises the steps of putting the modifier into the magnesium sulfate solution, injecting into an agitator after agitation, putting the bamboo fiber and the palm fiber into the agitator for agitation, putting magnesium oxide in the agitator for agitation, allowing slurry agitated by the agitator to fall into a foam mixing machine, injecting the foaming agent subjected high-pressure foaming into the slurry, performing foam mixing to form uniform foaming slurry, injecting the foaming slurry into a special mold car via a distribution system, and performing foam expelling, fiber stroking, curing, female groove forming, core pulling and push plate mold stripping. The magnesium oxysulfate wall plate is high in structural strength, good in water resistance and stable in physical property.

The invention discloses high-performance anti-freezing concrete and a preparation method thereof, and relates to the technical field of concrete preparation and production. The high-performance anti-freezing concrete comprises the following components by weight: 1200-1500 parts of aggregate, 150-180 parts of cement, 50-80 parts of mineral powder, 7-12 parts of a superplasticizer, 2-5 parts of an air entraining agent, 4-6 parts of an antifreeze agent, and 140-160 parts of water, wherein the aggregate comprises stones, medium sand and fine sand in a mass ratio of (4-5): (2-3): 1. The preparationmethod of the high-performance anti-freezing concrete comprises the following steps: S1, pre-dispersing an aggregate; S2, dispersing powder; S3, dispersing an aqueous solution; and S4, dispersing fibers. The anti-freezing concrete has the technical effects that the anti-freezing performance of concrete can be stably improved and the comprehensive performance is excellent.

The invention discloses a concrete early strength agent and a preparation method thereof. The concrete early strength agent is prepared from the following components in parts by weight: 1-3 parts of sodium chloride, 1-3 parts of sodium nitrite, 10-20 parts of sodium sulfate, 3-6 parts of calcium chloride, 2-6 parts of urea, 5-15 parts of methacrylic acid, 1-3 parts of silane, 1-5 parts of calcium gluconate, 1-5 parts of triisopropanolamine, 5-10 parts of fatty glyceride, 50-80 parts of polycarboxylate superplasticizer and 2-4 parts of finely grinded cement stone. The concrete early strength agent has the beneficial effects of rapidly drying concrete even in a low-temperature environment.

The invention discloses a precast beam reinforcement cage component and an assembling method thereof. The precast beam reinforcement cage component comprises a reinforcing steel bar assembly and a disassembly-free mould connected with the reinforcing steel bar assembly, wherein the reinforcing steel bar assembly is formed by connecting a horizontal reinforcing bar and a stirrup, and the disassembly-free mould is laid along the front side surface, the rear side surface and the bottom surface of a precast beam and is connected with the reinforcing steel bar assembly into a whole by virtue of a locating fixed part. The precast beam reinforcement cage component has the advantages that a large component and a reinforced concrete large-structure-space civil building can be realized, a working procedure is simplified, high-altitude operation is reduced, and current national reinforced concrete reinforcing bar specification can be met; meanwhile, cost is reduced, locating and supporting precision, assembling efficiency and quality of a structural component are improved, site construction is convenient, and a technology is controllable.

The invention provides dry-mixed mortar prepared from industrial solid waste. The dry-mixed mortar is characterized by being prepared from materials in parts by weight as follows: 100 parts of cement, 300-400 parts of river sand, 50-100 parts of steel slag, 0-50 parts of iron mine tailings, 0-50 parts of glass powder, 1-2 parts of an interface reinforcing agent, 1-2 parts of an exciting agent, 0.1-0.5 parts of a water retaining agent, 1-2 parts of a water reducing agent and 0.1-0.3 parts of reinforcing fibers. According to the dry-mixed mortar, the industrial solid waste is fully utilized as aggregate to replace natural river sand, environmental protection is facilitated, resource recycling is realized, and meanwhile, performance such as the freezing resistance, the permeability resistance and the like of the dry-mixed mortar is improved through addition of the industrial solid waste.

The invention relates to a composite early-strength type polycarboxylate superplasticizer as well as a preparation method and application thereof, belonging to the field of building materials. The technical problem to be solved by the invention is to provide the composite early-strength type polycarboxylate superplasticizer as well as the preparation method and application thereof. The composite early-strength type polycarboxylate superplasticizer is prepared from the following components in parts by weight: 20-50 parts of polycarboxylate superplasticizer, 2-5 parts of retarder, 30-75 parts of sodium thiosulfate, 3-10 parts of tri-isopropanolamine and 50-80 parts of water. Further, the invention also discloses the preparation method of the composite early-strength type polycarboxylate superplasticizer and the application of the composite early-strength type polycarboxylate superplasticizer in C15-C16 concrete. The composite early-strength type polycarboxylate superplasticizer disclosed by the invention has the advantages of excellent early-strength performance, relatively good compatibility among components, low alkali content, low shrinkage rate, low mixing amount and the like.

This invention provides a cement dispersant agent and its preparation method, it is the co-polymer of: poly-oxyalkylene (methyl) acrylate, unsaturated monocarboxylic acid or its derivatives monomers or other monomers. The inventive product has functions of: adsorption, air-guiding, dispersing, wetting, solubilizing, stability-increasing, the product makes the concrete having: low water/cement ratio, low viscosity, high fluidizing, slow-set, easy to produce concrete, realizing long-distance transportation. This product has also advantages of: low energy consumption, high efficiency, good repeatability.

The invention discloses a cement concrete pavement rapid repairing material and mortar and, a preparation method of the mortar, wherein the rapid repairing material comprises the raw materials in parts by mass: 50 to 70 parts of Portland cement, 10 to 20 parts of aluminate cement, 5 to 15 parts of semi-hydrated gypsum, 0.1 to 0.3 part of a defoaming agent, 0.1 to 0.3 part of a water reducing agentand 10 to 20 parts of a polymer emulsion. The rapid repairing mortar comprises the raw materials: intermediate sand, water and the cement concrete pavement rapid repairing material, wherein in partsby mass, the rapid repairing mortar comprises 120 to 140 parts of the intermediate sand, the mass ratio of water and the cement concrete pavement rapid repairing material is 0.3-0.4. The rapid repairing material can prevent poor repairing effect caused by unstable later strength of sulphoaluminate cement, can overcome the defect of brittleness of a cement-based material, also has the characteristic of quickly repairing concrete, and is stable in later strength.

The invention relates to a civil engineering mold bag which comprises a mold bag body (2). At least one opening is formed in the mold bag body (2), and a feeding pipe (4) is arranged at the other end of the mold bag body (2); and the exterior of the mold bag body (2) is sleeved with supporting rings (3) matched with the mold bag body (2) every 50-250 mm, and the supporting rings (3) are fixed to the corresponding positions of the mold bag body (2) through at least one bag loop (6). According to the civil engineering mold bag, the civil engineering mold bag sleeved with the reinforcing supporting rings is used as a soft mold to construct a down hole artificial pillar, a pillar body is formed by grouting at a time, construction is easy and convenient, and the speed is high; the constructed artificial pillar is high in integrality and good in stability; and according to a method for quickly constructing the artificial pillar, the down hole mold erecting working procedure is simplified, the constructing efficiency is improved, transporting is convenient, construction is easy and rapid, and the method is particularly suitable for construction of projects such as mine pillar body underground mining.

The invention belongs to the technical field of building materials, and particularly relates to a phosphorus gypsum foam product and a method for preparing the same. The phosphorus gypsum foam product is made of solid waste, admixtures and water. The solid waste includes phosphorus gypsum, steel slag and mineral waste residues, and the admixtures include hydrogen peroxide foaming agents and polycarboxylate water reducing agents. The phosphorus gypsum foam product and the method have the advantages that the phosphorus gypsum foam product is free of cement or cement clinker, the solid waste such as the phosphorus gypsum is high in usage and low in cost, accordingly, the phosphorus gypsum foam product and the method are favorable for consuming a large quantity of phosphorus gypsum which is an industrial byproduct, and waste can be turned into wealth.

The invention relates to the field of a repairing agents, and discloses a deicing salt-resisting cement-based channel repairing agent. The repairing agent is prepared fromconsists of the following components: potassium dihydrogen phosphate, magnesium oxide, borax, calcium carbonate, coal ash, silica fume, polyacrylamide, air entraining agent, awater reducing agent, fine aggregates, coarse aggregates and water. The invention also discloses a preparation method of the deicing salt-resisting cement-based channel repairing agent. The deicing salt-resisting cement-based channel repairing agent is short in time of coagulation, high in adhesive strength, excellent in anti-permeability and deicing salt corrosion resistance, and suitable for repairing road side channels, drainage channels and the like damaged by the stripping erosion of the deicing salt.