76results about How to "Guaranteed early strength" patented technology

The invention discloses a concrete early-strength agent, which is characterized in comprising the following components according to weight percentage: inorganic salt early-strength component 35-55 percent, organic early-strength component 5-10 percent, water reducing component 15-25 percent, wherein the inorganic salt early-strength component is prepared by at least two among sulfate, carbonate, nitrate, and nitrite; the organic early-strength component selects any one among calcium formate, sodium acetate, calcium oxalate, triethanolamine, tri-iso-propanolamine and carbamide; the water reducing component selects one among naphthalenesulfuric acid type, melamine type and polycarboxylate type. The invention makes the concrete be coagulated and hardened rapidly under the condition of low temperature, so that the early strength of the concrete is greatly improved as well as later strength is ensured.

A high-activity superfine additive for concrete is prepared from at least two of steel slag, flyash, granular slag of blast furnace and phosphur slag, and gypsum through grinding, proportional mixing and further pulverizing. Its advantages are high specific surface area (more than 400 sq.m/kg), high activity, and low heat release.

The invention discloses a method for cemented filling of phosphogypsum in a mine goaf. The method mainly comprises the following steps: mixing the following materials in weight ratio: 0.8 to 1.2 percent of cement, 1.2 to 0.8 percent of water quenched iron (steel) slag, 10 to 14 percent of the phosphogypsum, and 0.4 to 0.8 percent of lime; adding water to the mixture and stirring the mixture to form filling slurry with the weight concentration of between 55 and 65 percent; conveying the filling slurry to the mine goaf; and curing the filling slurry to form a high-strength filling material. The method can significantly reduce the curing time of the filling slurry taking the phosphogypsum as the main raw material, is suitable for various mining techniques and the cement filling for various types of mine goafs, and has strong economic and social benefits.

The invention relates to a method for preparing non-sintered ceramsite by adding dredged sludge. The method comprises the following steps: (1) pre-treatment of the dredged sludge; (2) material preparation: mixing and stirring smashed dredged sludge, cement, quick lime, gypsum and coal ash to prepare a dry mixture; the mass portions of the smashed dredged sludge, cement, quick lime, gypsum and coal ash are as follows: 60 to 80 parts of the dredged sludge, 1 to 6 parts of the cement, 1 to 6 parts of the quick lime, 1 to 6 parts of the gypsum and 3 to 15 parts of the coal ash; then uniformly mixing water glass with water to obtain a mixed solution of the water glass and the water, wherein the mass ratio of the adding amount of the water glass to the dredged sludge is 3 to 15: 60 to 80, and the adding amount of the water accounts for 40 to 60 percent of the total mass of the dry mixture and the water glass; (3) disc granulation; (4) primary curing of a product; (5) waterproofing work; (6) ultimate curing of the product, namely obtaining a finish product of the non-sintered ceramsite. According to the method provided by the invention, a large amount of dredged sludge can be added, the purpose of utilizing waste materials is realized, the requirements of a dredging Industry are met, the production energy consumption is low, and the produced non-sintered ceramsite can meet the demands of construction market.

The invention relates to a casing method of dredging sediment non-sintered ceramsites, comprising following steps: (1) crushing cement, quicklime, glass fibre powder, and fly ash by using a crusher; (2) mixing the pretreated cement, quicklime, glass fibre powder, and fly ash to make dry mixed casing material, weighing dredging sediment non-sintered ceramsites, wherein the mass ratio is : 10-20 parts of cement, 1-10 parts of quicklime, 1-10 parts of glass fiber powder, 1-10 parts of fly ash, and 50-70 parts of dredging sediment non-sintered ceramsites; (3) adopting a disc shot blasting machine for polishing casing; (4) maintaining for prepared non-sintered casing ceramsites. The casing method can consume a large amount of dredging sediment and meets the requirement for resource utilization of dredging industry, and largely promotes intensity of the dredging sediment non-sintered ceramsites, furthermore the production energy consumption is low, the non-sintered casing ceramsites have a wide application range and meet the requirements of construction markets.

The invention discloses a cement-based rapid repair material with high early strength, wherein the cement-based rapid repair material is prepared from the following raw materials by mass: 500-650 parts sulphoaluminate cement, 200-400 parts of ordinary Portland cement, 800-900 parts of quartz sand, 4.5-9.0 parts of nanometer silicon dioxide, 0.25-0.6 part of a dispersing agent, 1.1-10.8 part of a water reducing agent, 0.045-0.160 part of a retarder, 0.10-0.25 part of a defoaming agent and 315-360 parts of water. The invention further provides a preparation method of the cement-based rapid repair material with improved early strength. According to the invention, the field preparation is convenient and easy, sulphoaluminate cement and Portland cement are compounded so as to ensure the early strength and the later strength, the microstructure of the composite repair system is obviously improved through the nanometer material, the early mechanical property of the cement-based material is remarkably improved, the driving quality and the driving safety of the repaired pavement are ensured, the repair cost is low, and the practicability is high.

The invention relates to compound active powder of ball milling steel slag tailing slurry and blast-furnace slag and the application of the compound active powder in preparing concrete. The admixture is prepared by mixing ball milling steel slag tailing slurry powder and blast-furnace slag powder with equal Brinell specific surface area of 500-600 m <2>/kg according to the weight ratio of 1:1-2. When the compound active powder is used as concrete admixture, proper concrete mixing portion is adopted; and the admixture can be used for partially replacing equivalent cement gel according to the proportion of 30-50 percent so as to prepare the concrete with C30-C50 strength degree. The invention utilizes solid wastes of steel enterprises, changes the solid wastes into valuable and has simple production process, ensures that the concrete has good performance and markedly lowered manufacturing cost.

The invention relates to a method of preparing baking-free brick with a dredge sediment aggregate, which includes the steps of (1) sieving the dredge sediment aggregate; (2) smashing cement, quick lime, gypsum and fly ash in a pulverizer; (3) material blending: mixing and stirring the cement, the quick lime, the gypsum and the fly ash to obtain a dry-mixed material, weighing the dredge sediment aggregate, wherein the dry-mixed material comprises, by mass, 5-20 parts of the cement, 3-13 parts of the quick lime, 1-10 parts of the gypsum and 15-30 parts of the fly ash, and the dredge sediment aggregate accounts for 45-70 parts by weight; (4) adding water and stirring the mixture; (5) aging the mixture material; (6) press-moulding the mixture in a brick pressing machine; (7) performing product maintenance to obtain the baking-free brick. The method can consume the dredge sediment in a large quantity, thereby achieving resource recycling. The method can satisfy requirement in dredge industry and is low in production cost due to the baking-free process. The prepared baking-free brick is low in cost, is excellent in performances, can develop a utilization approach of recycling the dredge sediment resource, and satisfies the requirement of building material market.

The invention belongs to the technical field of oil-gas well development and discloses a temperature-responsive high temperature retarder suitable for oil-gas well cementation, a preparation method thereof and a well cementing slurry. The temperature-responsive high temperature retarder comprises a structural unit A shown as the formula (I), a structural unit B shown as the formula (II) and a structural unit C shown as the formula (III), wherein structural percentages of the structural units A, B and C include x=37.2-57.23%, y=40.52-61.4% and z=1.38-4.35%; the addition of the temperature-responsive high temperature retarder can be adjusted according to cementation design so that thickening time of oil well cement meets the requirements of well cementing construction, and the temperature-responsive high temperature retarder helps effectively improve thickening performance of cement slurry and improve early strength of top set cement during well cementation.

The invention discloses a complete set of tunnel mechanical equipment, which specifically refers to an excavation trolley (or an excavation gantry), a drainage and steel bar binding trolley, a liningtrolley, a spray maintenance trolley, a ditch cable trough trolley, an inverted arch self-propelled hydraulic trestle and a wet spray manipulator, referred to as five trolleys, one trestle and one wetspray machine. A construction organization method matched with the complete set of mechanical equipment comprises the following construction organization steps: S1, hole excavation; S2, initial support; S3, inverted arch lining; S4, arched wall lining; S5, ditch cable troughs and the complete set of mechanical equipment. The construction organization method is reasonable, effectively improves tunnel management effect, improves construction operation environment, ensures construction safety and quality, improves construction progress and is worthy of promotion.

The invention provides foam concrete prepared from undisturbed desulfurization gypsum and a preparation method thereof. The foam concrete is prepared from the following raw materials in parts by weight: 30-50 parts of wet desulfurization gypsum, 13-32 parts of dry desulfurization gypsum, 19-28 parts of superfine slag powder, 6-11 parts of cement, 6-9 parts of ash calcium powder, 0.63-0.70 part of a water reducer, 1.0-1.9 parts of an alkaline activator, 2.3-2.7 parts of a foaming agent, 2.8-3.4 parts of a foam stabilizer, 0.03-0.05 part of a catalyst, 0.13-0.17 part of polypropylene fiber, and 35-42 parts of water. The foam concrete prepared by the method provided by the invention is environment-friendly, energy saving, high in strength, low in thermal conductivity, low in linear shrinkage, etc. The undisturbed desulfurization gypsum is successfully used for preparing the foam concrete, natural resources are effectively saved, a new way for the comprehensive utilization of solid waste is opened up, and the scope of application of industrial waste gypsum is greatly expanded.

The invention discloses a method for producing a baking-free brick by doping massive industrial residues phosphogypsum and fly ash, which has the advantages of low production energy consumption and high product strength. The method comprises the following steps: a. pretreating phosphogypsum; b. mixing the pretreated phosphogypsum, fly ash, cement and quicklime to prepare a dry mixture, wherein the dry mixture comprises 35-65 wt% of phosphogypsum, 15-40 wt% of fly ash, 7-18 wt% of quicklime and 8-12 wt% of cement; adding water, and sufficiently mixing to prepare a wet mixture, wherein the water accounts for 27-33 wt% of the dry mixture; c. pouring, and carrying out vibratory compaction; d. curing in a curing chamber; e. curing in a steam curing chamber; and f. naturally curing to prepare the baking-free brick. The method disclosed by the invention can dope massive industrial residues phosphogypsum and fly ash, and has the advantages of low production energy consumption and high product strength.

The invention discloses early-strength setting-retarding high pier stud machine-made sand concrete and a preparation method thereof. The concrete is composed of, by mass, 450-550 parts of cement, 50-100 parts of mineral admixture, 827-891 parts of machine-made sand, 896-965 parts of gravel, 2.25-8.25 parts of admixture, 2.25-27.5 parts of modified active fiber and 144-176 parts of water. An early-strength setting-retarding function of the composite admixture and early-strength anticracking performance of the modified active fiber are utilized fully, so that the concrete has the advantages of long setting time, high early strength, good anticracking performance and excellent durability, the problem that artificial sand is increasingly in shortage is solved by utilizing the machine-made sand, and the problem of contradiction between ensuring early strength and controlling setting time in the prior art is solved.

The invention discloses a natural anhydrite self-leveling anti-cracking mortar, which is prepared by mixing the following components: natural anhydrite, composite activator, fly ash, quartz sand, water reducer, fiber, defoamer, Dispersed latex powder, water retaining agent, shrinkage reducing agent. The natural gypsum self-leveling anti-cracking mortar of the present invention uses natural gypsum as a main material, and an additional composite activator effectively stimulates the hydration rate of the anhydrite. It ensures the setting and hardening of the mortar and its early strength. Adding water-retaining agent, defoamer, dispersible latex powder, etc. greatly improves the construction and compactness of the mortar. Fiber and shrinkage reducing agent are also added in the formula to reduce the internal stress generated by the hardening of the mortar and prevent the mortar from cracking and deforming.

The invention provides a water reducing agent composition for steam-curing-free concrete and a preparation method thereof. The water reducing agent composition comprises an early-strength polycarboxylate water reducing agent, a C-S-H crystal nucleus, a lithium salt, nanoparticles and a general early strength agent. The acid-ether ratio of the water reducing agent is 4:1-5:1, and the water reducing agent is formed by copolymerization of HPEG, acrylic acid, acrylamide, 2-acrylamide-2-methyl propanesulfonic acid, DMC or DAP. The nanoparticles are nano metal oxides, and the early strength agent comprises at least one inorganic early strength agent and an organic early strength agent. The preparation method comprises the following steps: 1, mixing tricalcium silicate with the inorganic early strength agent, the organic early strength agent and water to obtain a gel system containing C-S-H crystal nucleus; 2, adding a water reducing agent to obtain a dispersion liquid containing C-S-H crystal nucleus; 3, adding the nanoparticles and a lithium salt into a water reducing agent, and stirring to obtain a dispersion liquid containing the nanoparticles and the lithium salt; and 4, slowly adding the product obtained in the step 2 into the product obtained in the step 3 to obtain the water reducing agent composition for steam-curing-free concrete. The composition disclosed by the invention is good in early strength effect, good in concrete construction performance, free of steam curing, simple in process and beneficial to shortening the construction period.

The invention discloses a quick repairing material and a preparation method. The quick repairing material is prepared from sulphoaluminate cement, fly ash, intermediate sand, polyvinyl alcohol fiber,water and a chemical admixture, and comprises the following specific components: 100 parts of sulphoaluminate cement, 0-30 parts of fly ash, 80-100 parts of intermediate sand, 0.8-1.2 parts of a naphthalene water reducing agent, 0-0.5 part of borax, 0-0.12 part of sodium gluconate, 0-0.15 part of citric acid, 0-1.5 parts of lithium carbonate, 0-2.0 parts of aluminum sulfate, 0-1.5 parts of aluminum chloride, 0-1.5 parts of calcium nitrate, 0-2.0 parts of sodium chloride and 0-2.0 parts of polyvinyl alcohol fiber. Firstly, the repairing material can be constructed under the temperature condition of 10 DEG C below zero to 40 DEG C, the initial setting time is 15-25 minutes, and the final setting time is 25-35 minutes; secondly, the repairing material achieves excellent compressive strength,the 2h compressive strength is 15-45MPa, and the 7d compressive strength is 45-80MPa; finally, the polyvinyl alcohol fiber is selected for reinforcing the sulphoaluminate cement, so that the quick repairing material has the 1d folding strength of 10-12MPa, the 7d folding strength of 12-14MPa and the 7d bending strength of 5-7MPa, and is free of dry shrinkage, therefore, requirements on quick hardening, high strength and toughness of a repairing project can be met.

The invention belongs to the technical field of special cement, and particularly relates to a manganese slag supersulfate cement and a preparation method thereof. The manganese slag supersulfate cement is prepared from the components in percentage by weight: 30-40% of manganese slag, 25%-50% of granulated blast furnace slag powder, 10-20% of sulfates, 5%-10% of a sulfate activator, 1-5% of an alkaline component and 0.05-2% of an alkaline activator. The manganese slag which is a high-temperature slag waste discharged during the blast furnace smelting process of manganese iron or silicomaganeseis used as a main raw material, a material science principle is combined, the mineral characteristics of manganese slag and slag are taken as a basis, the potential hydration activity of the manganeseslag is activated by using sulfates and alkaline environment to form the initial strength, and novel manganese slag supersulfate cement with excellent properties is further designed.

The invention relates to an inorganic-organic composite powder reinforcing agent for pervious concrete and application of the inorganic-organic composite powder reinforcing agent. The reinforcing agent comprises the following components in parts by weight: 66-71 parts of silica fume, 18-22 parts of redispersible latex powder, 10-11 parts of an early strength agent, 0.7-0.9 part of a water reducing agent and 0.01-0.05 part of a [beta]-cyclodextrin-carbon nanotube compound, and during application, the reinforcing agent is added in the mixing process of pervious concrete, and the mixing amount of the reinforcing agent is 4-6% of the mass of cement. Compared with the prior art, the preparation method has the advantages that inorganic reinforcing and organic toughening composite modification methods are combined, and specific components are mixed according to a certain proportion, so that the cohesion performance and the adhesion performance of cement mortar can be effectively improved, and the compressive strength and the breaking strength of the pervious concrete are improved on the premise of keeping the same porosity; and the freeze-thaw durability is also well improved.

The invention discloses a resource-saving low-carbon cement clinker and a preparation method thereof, and belongs to the technical field of Portland cement clinker production. The cement clinker comprises the following raw materials in percentage by mass: 45-70% of high-calcium low-magnesium limestone, 10-40% of barren rock, 4-12% of shale or sandstone, 4-12% of slag, 1-3% of sulfate slag or iron slag, 1-3% of fly ash, 0-3% of coal cinder or coal gangue, 0.5-3% of phosphorus slag and phosphogypsum and 0.1-0.3% of an added activating agent. According to the resource-saving low-carbon cement clinker and the preparation method thereof of the invention, a large amount of solid waste is utilized, the adopted industrial waste residue is formed by high-temperature calcination, carbonate hardly exists, and CO2 hardly occurs after high-temperature calcination is performed again; the mixing amount of the industrial waste residues is high, the use amount of limestone is greatly reduced; the mineralization of trace elements in the industrial waste residues is utilized, and the activating agent is added, so that the burnability of the raw materials is improved, the sintering stability of the clinker is reduced, and the performance of the clinker is improved; the firing temperature of the low-carbon cement clinker is reduced by 100-150 DEG C compared with the firing temperature 1450 DEG C of traditional Portland cement clinker, and therefore, the coal consumption is obviously reduced, and the emission of CO2 is reduced.

The invention relates to a low temperature rapid hardening grouting material for an offshore oil well. The low temperature rapid hardening grouting material for the offshore oil well comprises the following raw materials in parts by weight: 2,000 parts of gel materials, 950-965 parts of inorganic mineral active materials, 25-35 parts of retarders, 5-10 parts of anti-freezing ingredients, 3-5 parts of high efficiency slushing agents, and 0.1-0.3 part of defoaming agents, wherein the gel materials are quick-hardening sulphate aluminium cement and oil well cement; the mass ratio of the quick-hardening sulphate aluminium cement and oil well cement is 5:5-8:2. The invention also provides a preparation method thereof. The grouting material is suitable for construction under a well cementation low-temperature environment, slurry can maintain better mobility and is high in early strength, the slurry is full without shrinkage, the long-term strength is high, and the well cementation construction time and the underground grouting environment parameter requirement are effectively ensured.

The invention discloses a frost damage prevention method for cast-in-place concrete beams and slabs. Before the concrete beams and slabs are cast, a scaffold is arranged on the ground, and formworks are arranged on the scaffold to cast the concrete beams and slabs. The frost damage prevention method includes the following steps that 1, the periphery of the scaffold is closed; 2, multiple heating devices are erected below the scaffold and used for heating the formwork located on the scaffold; 3, the concrete beams and slabs are cast on the formworks above the heating devices; 4, a sealing film, a straw mattress and an extruded sheet are sequentially laid on the upper surfaces of the concrete beams and slabs to seal cast concrete and preserve the heat of the cast concrete. According to the frost damage prevention method for the cast-in-place concrete beams and slabs, the concrete can be in a positive temperature environment in the casting and curing processes to effectively ensure the early-stage strength of the concrete.