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139results about How to "Good early strength" patented technology
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Sleeve grouting material for assembly type building steel bar connection
The invention discloses a sleeve grouting material for assembly type building steel bar connection, wherein the sleeve grouting material is formed by adding water and a water reducing agent to a steel bar sleeve grouting material dried powder and mixing; the sleeve grouting material dried powder is formed by mixing the following components by the mass percentage: 40-45% of cement, 45-55% of a fine aggregate, 2-3% of silica fume, 2-3% of superfine granulated blast furnace slag, 2-3% of an expanding agent, 0.1-0.2% of a set retarder, and 0.15-0.25% of a defoaming agent, wherein the water-binder ratio is 0.24-0.26, and the mixing amount of the water reducing agent is 2.5-3.5% of the total amount of cementitious materials. The sleeve grouting material has the advantages of high fluidity, high early and later strength, early micro-expansion, no shrinkage and no water bleeding at later stage, and no corrosion to steel bars, is grouted into a steel bar sleeve, can make the steel bars and the steel bars as well as the steel bars and the sleeve form firm connection, and has good durability.
Owner:重庆市建筑科学研究院有限公司 +1
Formula of early strength type polycarboxylic acid series high-performance dehydragent and method for manufacturing same
The invention proposes a compounding formula and manufacture method of an early-strength polyocarboxy acid high performance water reducing agent. The compounding formula is as follows: (1) the mass ratio of 37 61.5percent allyl polyethyleneoxide ether water-soluble fluid with polymerization degree 37, allyl polyethyleneoxide ether, acrylic acid, 27.7percent acrylic amide water-soluble fluid, 26.2percent methyl propylene sulfonic acid sodium water-soluble liquid is 2321:882:311:276.7:542.2; (2) the consumed amount of the initiator hydrogen peroxide is 0.2percent of a monomer mole number; (3) the initiator Sodium bisulfoxylate is 0.06percent of a monomer mole number; (4) the five elements copolymerization is carried on in the 60percent density system under 55 DEG C. The invention synthesizes carboxylic acid series product with strong early-strength performance, which especially are used for increasing the early-strength of the concrete largely under the low temperature of the winter to speed up the concrete construction progress and enhance the use efficiency of the construction template though the adjustment of the formula and craft. The invention is suitable for the concrete project with high requirements for the concrete early-strength (within 2 days).
Owner:LETS HLDG GRP CO LTD +1
Anti-freeze aerated concrete brick
The invention discloses an anti-freeze aerated concrete brick. The anti-freeze aerated concrete brick is prepared from the following raw materials in parts by weight: 35-40 parts of fly ash, 15-20 parts of cement, 15-20 parts of wollastonite powder, 5-10 parts of modified straw ash, 2-4 parts of gypsum, 0.05-0.1 part of aluminum powder, 2-4 parts of urea, 0.01-0.03 part of oxyparaffin soap, 1-2 parts of sugar calcium, 4-6 parts of calcium formate, 0.1-0.5 part of polyethylene wax powder, 4-6 parts of calcium carbonate, 0.2-0.4 part of calcium nitrate, 0.1-0.2 part of sodium acetate and right amount of water.
Owner:潘逸东
Preparation technology for slag foamed concrete block
InactiveCN102219546AGood early strengthShort initial setting timeCeramicwareFoam concreteFoaming agent
The invention discloses a preparation technology for a slag foamed concrete block. The preparation technology comprises: (1) preparing a slag early strength agent; (2) preparing a slag cementing material; (3) preparing a compound admixture; (4) preparing foam of a foaming agent; (5) preparing a mixed slurry; (6) mixing the mixed slurry and the foam of the foaming agent according to a volume ratio of 1:6, followed by carrying out stirring to prepare a foamed slurry having a volume weight of 20-130 mm; (7) conveying the foamed slurry in a standing room, and supplying saturated vapor to the standing room, wherein a heating rate on the standing room is 5-8 DEG C per hour, followed by standing for 3-6 hours at a temperature of 55-60 DEG C, then conveying the stood foamed slurry in a autoclave, wherein steam pressure in the autoclave is increased to 0.8-1.2 Mpa in 2-3 hours, then remaining a constant temperature for 4-6 hours, followed by decreasing the steam pressure to zero in 2-2.5 hours to prepare the finished product. Each technical index of the solid slag autoclaved foamed concrete block provided by the present invention is superior to or accords with standard requirements of JC / T1062-2007 foamed concrete block.
Owner:杜世永
Preparation method of ester early-strength polycarboxylic acid water reducing agent
The invention discloses a preparation method of an ester early-strength polycarboxylic acid water reducing agent. The technical scheme is as follows: the preparation method comprises the following steps: preparing amide small monomer by amidation reaction, preparing esterified big monomer by esterification reaction, and carrying out free radical copolymerization with other unsaturated monomers to obtain the ester early-strength polycarboxylic acid water reducing agent. The product has excellent early-strength property, and can effectively enhance the early strength of the concrete.
Owner:KZJ NEW MATERIALS GROUP CO LTD
Preparation method of synthetic type polycarboxylic acid water reducer
The invention discloses a preparation method of a synthetic type polycarboxylic acid water reducer. The synthetic type polycarboxylic acid water reducer has a solid content of 40-50%, and is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 7-15 parts of unsaturated acid, 4-10 parts of unsaturated ester, 1-3 parts of an amide derivative, 0.5-2 parts of an oxidant, 0.2-1.2 parts of a chain transfer agent, 0.3-2 parts of a reducing agent, 0.1-1 part of a crosslinking agent, 0.01-0.1 part of ferrous sulfate heptahydrate, 5-10 parts of a commercially available mud-resistant auxiliary agent, 90-130 parts of deionized water and an appropriate amount of liquid caustic soda. The preparation method disclosed by the invention adopts a normal-temperature oxidation-reduction initiating system to synthesize the synthetic type polycarboxylic acid water reducer which not only has functions of water reduction and slump loss resistance, but also has functions of mud resistance and early strength, heating is not needed for reaction, the energy consumption is reduced, and the production cost is greatly reduced.
Owner:KZJ NEW MATERIALS GROUP CO LTD +1
Rapid-hardened super-early strength polycarboxylate water reducer and preparation method thereof
The invention discloses a rapid-hardened super-early strength polycarboxylate water reducer and a preparation method thereof. According to the rapid-hardened super-early strength polycarboxylate waterreducer disclosed by the invention, by using a molecular cutting technique, molecular structures of main chain groups, side chain groups and the like are designed, a polyether monomer of a super-highmolecular weight is adopted as an active large monomer, a structure with a long side chain and a short main chain is formed by molecular chains, a small monomer of self-made unsaturated alcohol aminoester and small monomers such as ethyl methacrylate with N groups and triallylamine are introduced, and solution polymerization is carried out at a low temperature. The synthesized polycarboxylate water reducer has an outstanding function of promoting cement hydration reactions, can be applied to steam-curing concrete, low-temperature environment concrete and concrete with a requirement of demolding in advance, is capable of remarkably shortening the plastering and primary curing time of a molded plate, has a remarkable early strength effect, and is capable of accelerating the construction progress of concrete and increasing the transfer rate of mold plates.
Owner:KZJ NEW MATERIALS GROUP CO LTD
Alkali-activating-agent-doped early strength super-high performance concrete and preparation method thereof
ActiveCN106517934AShort initial setting timeImprove early strengthHigh performance concreteSetting time
The invention discloses alkali-activating-agent-doped early strength super-high performance concrete and a preparation method thereof. The concrete comprises, by mass, 1019-1059 parts of a cementing material, 1120-1271 parts of quartz sand, 165-205 parts of fibers, 20.38-21.18 parts of a water reducing agent, 12.2-25.6 parts of a de-foaming agent, 20.38-21.18 parts of an alkali activating agent and 152.85-180.03 parts of water. Under the effect of the alkali activating agent, the cementing material contains lots of Si-O and Al-O bond rupture, SiO4 and AlO4 tetrahedrons are made to be fast dissolved out, lots of inorganic high-molecular polymers are fast formed through a polycondensation reaction, the early strength of the concrete is improved fast, and the super early strength effect is achieved. The alkali activating agent is doped in, the initial setting time of the super-high performance concrete is greatly shortened, the super-high performance concrete is made to have very high early strength, the stripping time is shortened, and the circulation efficiency of preparation of the concrete is accelerated.
Owner:西安华清科教产业(集团)有限公司
Compound curing agent for dredged silt and preparation method thereof
ActiveCN107226661AFully and evenly absorbedNo localized underabsorptionFixation/solidifcation sludge treatmentContaminated waterways/lakes/ponds/rivers treatmentFiberGraphite
The invention relates to a compound curing agent for dredged silt and a preparation method thereof. The compound curing agent for dredged silt comprises the following components in parts by weight: 20-30 parts of aluminum sulfate cement clinker, 30-40 parts of expandable graphite, 5-10 parts of organobentonite, 3-8 parts of pozzolanic material, 1-3 parts of calcined diatomite, 3-5 parts of enhanced aggregate, 6-12 parts of quicklime, 10-15 parts of sodium hydroxide, 8-10 parts of expansible resin, 5-8 parts of sodium silicate and 5-8 parts of carbon fiber. The curing agent provided by the invention combines the respective advantages of multiple traditional soil stabilizers, and the various effective components are organically combined together according to a proper ratio, thereby giving full play to the characteristics and synergistic action of the components. The curing agent provided by the invention has the advantages of favorable early strength performance, excellent strength stability, favorable water stability and the like, can obviously improve the properties of silt such as high water content, low strength and the like, and converts the waste dredged silt into a reproducible geomaterial for utilization, thereby achieving excellent curing effects and economic effects.
Owner:余思哲
Preparation method of cheap single-component alkali-activated cement and application method thereof
The invention discloses a preparation method of cheap single-component alkali-activated cement and an application method thereof. The preparation method comprises the following steps: respectively grinding salic raw material, calcareous raw material, cheap salt containing alkali metal and carbonaceous raw material; then mixing according to a certain sequence and proportion so as to generate a raw material; quickly heating the raw material powder till a preset maximum temperature; after preserving the temperature for 0.5-3.0 hours, quickly cooling till a normal temperature to obtain clinker; grinding the clinker till the fineness of cement so as to obtain cement; adding water into the cement to be mixed into slurry, wherein the water is added till the slurry of water and cement can be compacted through vibration in a mold; after the slurry added in the mold is compacted through vibration, moisturizing and curing for 1-3 days at the temperature of 50-80 DEG C so as to obtain required strength; and doping other aggregates and inert fillers in the cement slurry according to the requirement. The raw materials of the cheap single-component alkali-activated cement are rich, easily obtained and low in cost; and the whole preparation process is low-carbon and low in energy consumption, and the obtained product has good early strength so as to establish a new way for cement material.
Owner:HUNAN UNIV OF SCI & TECH
High-efficiency water-reducing agent
The invention discloses a high-efficiency water-reducing agent, which is prepared by the following raw materials in parts by weight: 50-60 parts of beta-naphthalene sulfonate formaldehyde condensate, 20-30 parts of poly(ethylene glycol) monomethyl ether methacrylate, 15-25 parts of calcium lignosulphonate, 10-15 parts of ethylene oxide-propylene oxide copolymer, 2-4 parts of trehalose, 1.5-2.5 parts of silicone powder, 4-8 parts of shale ashes, 2.5-4.5 parts of sodium hydrogen sulfite, 5-10 parts of polyethylene oxide, 8-14 parts of aluminum tripolyphosphate, 2-3 parts of cocoanut oil diethanolamide, 1-2 parts of barium dinonyl naphthalenesulfonate, 2-3 parts of urotropine, and 3-5 parts of auxiliaries. The water-reducing agent is high in water-reducing rate, good in flowability, capable of obviously improving the flowability and working degree of the concrete, obvious in early-strength effect after being finally set, capable of greatly improving the strength of the concrete in all ages, and applicable to various concretes.
Owner:唐山砼科建筑科技有限公司
Reduced shrinkage early strength polycarboxylic acid water reducing agent mother liquid and preparation process thereof
The invention discloses a reduced shrinkage early strength polycarboxylic acid water reducing agent mother liquid and a preparation process thereof. The water reducing agent mother liquid is preparedby the free radical copolymerization reaction of a polyether macro-monomer, an anionic active monomer, a cationic active monomer, a shrinkage reducing monomer, a chain transfer agent and an initiator;wherein the polyether macro-monomer is isopentenyl polyoxyethylene ether and / or methyl allyl polyoxyethylene ether; the anionic active monomer is acrylic acid; the cationic active monomer is methacrylatoethyl trimethyl ammonium chloride; the shrinkage reducing monomer is an esterification reaction product of a phenyl alcohol or a methyl phenyl alcohol with acrylic acid; the chain transfer agent is 2-methyl-2-propene-1-sulfonic acid sodium salt; and the initiator comprises an initiator system A and an initiator system B, the initiator system A comprises organic hydrogen peroxide and vitamin C,and the initiator system B comprises sodium bisulfite and a ferrous salt. According to the preparation process, different functional monomers are grafted to the high-performance polycarboxylic acid water reducing agent, and the length of the main chain is adjusted, so that the polycarboxylic acid water reducing agent has excellent water reducing rate, and also has early strength and reduced shrinkage.
Owner:WUHAN SUBO NEW BUILDING MATERIAL CO LTD
Preparation method of high-thixotropy early-strength type polycarboxylate superplasticizer
ActiveCN105504180APromotes early hydrationPromotes the function of hydration reactionVinyl etherSuperplasticizer
The invention discloses a preparation method of a high-thixotropy early-strength type polycarboxylate superplasticizer. The preparation method comprises the following steps of (1) adding isobutene polyoxyethylene ether and / or isopentene polyoxyethylene ether, micromolecular polyether, unsaturated fatty acid glyceride, a quaternary ammonium salt monomer and an oxidant into water, and stirring the mixture under 15 to 30 DEG C until the mixture is dissolved; (2) preparing a first solution by a reducing agent and water, preparing a second solution by a chain transfer agent and the water, and preparing a third solution by unsaturated monocarboxylic acid, an unsaturated carboxylic ester monomer and the water; (3) dropping the first solution, the second solution and the third solution in materials in step (1) within 3 to 4 hours at the same time, and carrying out a heat-preservation reaction for 1 to 1.5 hours under 35 to 40 DEG C after dropping is completed; (4) adding an alkaline modifier to neutralize the pH (Potential Of Hydrogen) to be 6 to 7 after the reaction of the materials in step (3) is completed, thus obtaining the high-thixotropy early-strength type polycarboxylate superplasticizer. The high-thixotropy early-strength type polycarboxylate superplasticizer prepared by the invention has an excellent thixotropic property.
Owner:KZJ NEW MATERIALS GROUP CO LTD
Green expansive cementing material based on salt chemical industry solid waste and building garbage, preparation method and applications thereof
InactiveCN105152553AGood expansion performanceGood affinity for mudMaterial fill-upClinker productionSteelmakingChemical industry
The present invention discloses a green expansive cementing material based on salt chemical industry solid waste and building garbage, and a preparation method thereof, wherein salt-containing chemical industry waste (salt mud, carbide slag and mirabilite), building garbage (gravel, broken bricks and concrete blocks), steelmaking plant waste residue (water residue and steel residue) and power plant desulfuration gypsum are matched with an expander, a water reducer, a soluble calcium salt and other components, and fine grinding and uniform mixing are performed to prepare the green expansive cementing material. According to the present invention, the salt mud, the carbide slag, the mirabilite and other solid waste produced by the salt chemical industry enterprise are digested while the building garbage, the desulfuration gypsum, the water residue and other solid water are subjected to the resource utilization, such that the green expansive cementing material is the green environmental protection cementing material; and the green expansive cementing material has characteristics of good expansion property, good fluidity, good consolidation property, good early strength, active tightening and effective earth's surface sinking control, is the cementing material for mine, and is particularly suitable for the filling mining of coal mines or non-coal mines.
Owner:胡相明
Additive for improving early strength of cement based material as well as preparation method and application of additive
The invention provides an additive for improving early strength of a cement based material. The additive is prepared by the reaction of an ionic copolymer and silane, wherein the ionic copolymer is prepared by the reaction of a monomer A, a monomer B, a monomer C and a monomer D. The invention further provides a preparation method of the additive for improving early strength of the cement based material and application of the additive in improvement of the early strength of the cement based material. The additive is simple in preparation process, convenient to use, low in cost and relatively high in water reduction rate, accelerates the hydration of the cement in the early stage, improves the early strength of the cement based material, particularly shows an obvious effect on improving the early strength of the cement based material at a low temperature environment, is relatively high in adaptability to the raw materials, has a good super early strength improving effect for different cement, and does not have any adverse effect on the future strength and durability.
Owner:JIANGSU SOBUTE NEW MATERIALS +1
Early strength type polycarboxylate superplasticizer and preparation method thereof
PendingCN109608594AGood early strength development rateGood flow dispersionPolymer scienceSide chain
The invention relates to the technical field of concrete additives in building materials, specifically to an early strength type polycarboxylate superplasticizer and a preparation method thereof. Theearly strength type polycarboxylate superplasticizer is prepared from the following raw materials through a polymerization reaction: block unsaturated polyoxyethylene ether, acrylic acid, a functionalmonomer, a chain transfer agent, an oxidative initiator and a reductive initiator. According to the invention, the block unsaturated polyoxyethylene ether is adopted as a raw material, and a macromolecular block polyether side chain can improve the water-reducing rate performance of a superplasticizer, also exerts the performances of early strength, viscosity reduction and shrinkage resistance, greatly reduces the content of air, shortens the setting time of concrete and has excellent working performance and adaptability.
Owner:广东奥克化学有限公司
Lime silica sand silicate cement and use technique method thereof in tubular pile production
The invention provides lime silica sand silicate cement and a use technique method thereof in tubular pile production. The lime silica sand silicate cement is obtained by the following steps: mixing lime silicate cement clinker, silica sand, quicklime, gypsum and the like in a certain proportion; and then grinding. The use technique method is as follows: the cement is used for replacing high-label silicate cement or ordinary silicate cement, and a tubular pile is produced by using a steam maintenance process. By using the cement, the concrete in the tubular pile under the normal-pressure maintenance condition has good early strength property, and the strength of the concrete in the tubular pile under the autoclave maintenance condition.
Owner:嘉兴学院管桩应用技术研究所
Highly anti-bending and wearing-resistant lightweight concrete
The invention discloses highly anti-bending and wearing-resistant lightweight concrete, which comprises the following raw material constituents in parts by weight: 200-250 parts of cement, 100-150 parts of coal ash, 150-200 parts of river sand, 100-180 parts of manganese residue, 150-200 parts of ceramsite, 20-50 parts of silicon carbide, 15-35 parts of plant fiber, 200-250 parts of water, 0.3-1.5 parts of dipropyl ethylene glycol monobutyl ether, 3-6 parts of silicon resin polyether emulsion, 0.3-1.8 parts of sodium chloride, 2-5 parts of triethanolamine, 0.3-1 part of sodium sulfate, 1-3 parts of epoxy resin, 1-3.5 parts of waste polyurethane, 1-2.3 parts of sodium stearate, 5-16 parts of nano calcium oxide, 0.3-0.9 part of coagulant, 2-5 parts of melamine water reducer and 5-18 parts of foaming agent. The highly anti-bending and wearing-resistant lightweight concrete provided by the invention has high anti-bending strength, good wear resistance, light weight and excellent water resistance.
Owner:无为县严桥双龙建材厂
Method for preparing special functional polycarboxylate water reducer for PHC pipe pile
ActiveCN104292397AIdeal molecular weightIdeal molecular weight distributionApparent viscosityChemistry
Owner:JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
Early strength type polycarboxylic acid series high-performance water reducing agent and method for manufacturing same
The invention proposes a compounding formula and manufacture method of an early-strength polyocarboxy acid high performance water reducing agent. The compounding formula is as follows: (1) the mass ratio of 37 61.5percent allyl polyethyleneoxide ether water-soluble fluid with polymerization degree 37, allyl polyethyleneoxide ether, acrylic acid, 27.7percent acrylic amide water-soluble fluid, 26.2percent methyl propylene sulfonic acid sodium water-soluble liquid is 2321:882:311:276.7:542.2; (2) the consumed amount of the initiator hydrogen peroxide is 0.2percent of a monomer mole number; (3) the initiator Sodium bisulfoxylate is 0.06percent of a monomer mole number; (4) the five elements copolymerization is carried on in the 60percent density system under 55 DEG C. The invention synthesizescarboxylic acid series product with strong early-strength performance, which especially are used for increasing the early-strength of the concrete largely under the low temperature of the winter to speed up the concrete construction progress and enhance the use efficiency of the construction template though the adjustment of the formula and craft. The invention is suitable for the concrete project with high requirements for the concrete early-strength (within 2 days).
Owner:LETS HLDG GRP CO LTD +1
Anti-crack high slump loss resistance concrete polycarboxylate superplasticizer
The invention discloses an anti-crack high slump loss resistance concrete polycarboxylate superplasticizer, being prepared from the following components in parts by weight: 25-35 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 40-50 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 3.5-4.5 parts of 2-propylene acyl amino-2-methyl-1-propane sulfonic acid, 4-5 parts of allyl polyoxyethylene ether, 3-5 parts of maleic anhydride, 2.5-3.5 parts of dimethyl fumarate, 3-5 parts of hydroxyalkyl acrylate, 4-8 parts of sodium hypophosphite, 0.5-1.5 parts of tartaric acid, 80-83 parts of water and 15-21 parts of sodium hydroxide. The anti-crack high slump loss resistance concrete polycarboxylate superplasticizer has good adaptability to cement, is less in amount of admixture and high in water-reducing rate, is capable of reducing water cement ratio and improving fluidity, is low in slump loss and remarkable in early strengthening effect, and is capable of improving the compactness of concrete, saving cement, improving the working performances of the concrete and improving the durability of the concrete.
Owner:HUNAN CONSTR ENG GRP COR +1
Micro-expansion super early-strength bearing grout
InactiveCN101983945AGuaranteed contactQuality assuranceBuilding repairsBridge structural detailsFlexural strengthLate stage
The invention provides a micro-expansion super early-strength bearing grout which comprises the following raw materials in parts by weight: 30-50 parts of cement, 40-60 parts of sand, 0.5-2.5 parts of water-reducing agent, 2-4 parts of expanding agent, 0.1-0.5 part of retarder and 5-10 parts of enhancer. The micro-expansion super early-strength bearing grout has the following advantages: (1) the working property is excellent, the initial fluidity reaches 320mm, and the fluidity at 30min is still above 240mm; (2) the early strength has rapid development, the strength at the late stage is not reduced, the compressive strength at 2h can be more than 20MPa, the compressive strength at 24h is more than 40MPa, the flexural strength is greater than 10MPa, and the compressive strength at 28d is greater than 50MPa; and (3) the micro-expansion super early-strength bearing grout has micro-expansion property. In view of the advantages, the micro-expansion super early-strength bearing grout can effectively improve the construction rate of a foundation bearing and other structures, and ensure the installation conformance and the construction quality of members.
Owner:WUHAN HUAXUAN HIGH TECH
Composite early-strength type polycarboxylate superplasticizer as well as preparation method and application thereof
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.
Owner:CHINA 19TH METALLURGICAL CORP CHENGDU CONSTR +1
Early-strength low-hydration heat evolution cement paste system applicable to deepwater shallow cementation
The invention discloses an early-strength low-hydration heat evolution cement paste system applicable to deepwater shallow cementation. The system is prepared from 100 parts of cement, 5-10 parts of phase-change heat absorption materials, 10-30 parts of a density reducing agent, 8-15 parts of suspension materials, 0.5-1 part of a drag reducer, 0.3-0.55 part of retarder, 0.7-1 part of a fluid loss agent, 0.7-1 part of a defoaming agent, 0.06-0.1 part of an early strength agent and 68.2-82.3 parts of water. The cement paste system has the good early strength property at low temperature, is small in hydration heat evolution amount and good in thickening property, flowing property and sedimentation stability, has right-angle thickening property and small water loss, and meets on-site construction requirements. According to the system, surface cementation in the deepwater hydrate layer can be achieved, operation time and cost can be saved, and a technical support is provided for mining of oil and gas resources in the deepwater hydrate layer.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Polyether amine water reducing agent with controllable and regular molecular structure and preparation method of polyether amine water reducing agent
The invention discloses a polyether amine water reducing agent with a controllable and regular molecular structure. A preparation method of the polyether amine water reducing agent comprises the following steps: adopting an end-amino polyether and diepoxide to have amino-epoxy ring-opening polymerization reaction, obtaining a polymer with the end-amino polyether being grafted on a main chain into a side chain, and then enabling hydroxyl generated in the amino-epoxy ring-opening polymerization reaction to have esterification reaction with organic anhydride to obtain the polyether amine water reducing agent with the controllable and regular molecular structure. The water reducing agent prepared by the invention has the advantages of the existing water reducing agent, is also good in controllability of the production process, less in side reaction, high in applicability to different cement varieties, high in water reducing rate and high in cost performance and competitive advantage.
Owner:JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
Early-strength type mining sealing material
ActiveCN106833568AImprove decomposition rateImprove early strengthDrilling compositionInorganic saltsUltimate tensile strength
The invention relates to an early-strength type mining sealing material. The sealing material comprises the following components in parts by weight: 0.1-8% of inorganic salt early-strength components, 0.1-0.8% of organic early-strength components of, 0.1-0.5% of water reducing components, and the balance of cement clinker. The finished product can be obtained by mixing the components according to the proportion and evenly stirring and dispersing. The sealing material has an early-strength effect, the one-day strength is 14.5MPa, three-day strength is 26.7MPa, seven-day strength is 39.1MPa, the fluidity of cement past is greater than 200mm, the coagulation time is shorter than 500min, the pumping performance is not affected while the early-strength performance is improved, the sealing material can completely meet the use demands for mine gas pumping and deep hole blasting sealing, the blasting waiting time can be greatly shortened, thus being safer. Furthermore, the material can be prepared underground on site, and is non-toxic and pollution-free. The material not only can be used for sealing for pumping mine gas or drilling during blasting of deep holes, but also can be used for blocking other related cracks.
Owner:ANHUI UNIV OF SCI & TECH
A kind of sleeve grouting material for prefabricated building reinforcement connection
The invention discloses a sleeve grouting material for assembly type building steel bar connection, wherein the sleeve grouting material is formed by adding water and a water reducing agent to a steel bar sleeve grouting material dried powder and mixing; the sleeve grouting material dried powder is formed by mixing the following components by the mass percentage: 40-45% of cement, 45-55% of a fine aggregate, 2-3% of silica fume, 2-3% of superfine granulated blast furnace slag, 2-3% of an expanding agent, 0.1-0.2% of a set retarder, and 0.15-0.25% of a defoaming agent, wherein the water-binder ratio is 0.24-0.26, and the mixing amount of the water reducing agent is 2.5-3.5% of the total amount of cementitious materials. The sleeve grouting material has the advantages of high fluidity, high early and later strength, early micro-expansion, no shrinkage and no water bleeding at later stage, and no corrosion to steel bars, is grouted into a steel bar sleeve, can make the steel bars and the steel bars as well as the steel bars and the sleeve form firm connection, and has good durability.
Owner:重庆市建筑科学研究院有限公司 +1
Concrete early strength agent and preparation method thereof
ActiveCN106243289AHigh water reduction rateGood early strengthCompressive strengthUltimate tensile strength
The invention relates to a concrete early strength agent and a preparation method thereof and aims to provide a concrete early strength agent which has water-reducing and early strength functions and can rapidly raise early strength of concrete after being doped and a preparation method thereof. The concrete early strength agent is obtained by free radical polymerization of VPEG, any one ingredient selected from a group consisting of methacrylic acid, acrylic acid and maleic anhydride, acrylamide or maleimide, and octadecyl methacrylate. The prepared concrete early strength agent has high water-reducing rate and excellent early strength performance. When solid volume discount is 0.2%, the water-reducing rate can reach 30% and above, 1d compressive strength rate of concrete reaches 240% and above, and 3d compressive strength rate reaches 220% and above. During production of a prefabricated part in winter, steam curing time can be shortened. During production in summer, the steam-curing process can be avoided. Thus, energy consumption is greatly reduced, and production cost of the prefabricated part is lowered.
Owner:CHONGQING SANSHENG IND CO LTD
Superplasticizer
The invention discloses a high-efficiency water-reducing agent, which is prepared by the following raw materials in parts by weight: 50-60 parts of beta-naphthalene sulfonate formaldehyde condensate, 20-30 parts of poly(ethylene glycol) monomethyl ether methacrylate, 15-25 parts of calcium lignosulphonate, 10-15 parts of ethylene oxide-propylene oxide copolymer, 2-4 parts of trehalose, 1.5-2.5 parts of silicone powder, 4-8 parts of shale ashes, 2.5-4.5 parts of sodium hydrogen sulfite, 5-10 parts of polyethylene oxide, 8-14 parts of aluminum tripolyphosphate, 2-3 parts of cocoanut oil diethanolamide, 1-2 parts of barium dinonyl naphthalenesulfonate, 2-3 parts of urotropine, and 3-5 parts of auxiliaries. The water-reducing agent is high in water-reducing rate, good in flowability, capable of obviously improving the flowability and working degree of the concrete, obvious in early-strength effect after being finally set, capable of greatly improving the strength of the concrete in all ages, and applicable to various concretes.
Owner:唐山砼科建筑科技有限公司
Water reducing agent and preparation method thereof, anti-freezing agent and purpose thereof, and concrete
ActiveCN110423038AIncreased hydration rateImprove early strength and workability functionsMaleic anhydrideChemistry
The invention provides a water reducing agent and a preparation method thereof, an anti-freezing agent and a purpose thereof, and concrete, which belongs to the technical field of freeze protection. The water reducing agent includes the following raw materials: isoamylenol polyoxyethylene ether and allyl alcohol polyoxyethylene ether, and at least one of acrylic acid and maleic anhydride, whereinthe molar ratio of the isoamylenol polyoxyethylene ether to the allyl alcohol polyoxyethylene ether is 1: (0.5-1). The anti-freezing agent includes the water reducing agent and non-oxidizing salts. The water reducing agent utilizes the isoamylenol polyoxyethylene ether and the allyl alcohol polyoxyethylene ether to perform cooperation as a water reducing agent synthesis monomer, under the synergistic effect of the two, the early strength performance of a product can be improved and the workability of the product can be improved, when the water reducing agent is applied to the anti-freezing agent, and since the water reducing agent is strong in early strength performance, usage of antifreezing early strength components in the anti-freezing agent can be effectively reduced.; and the anti-freezing agent is high in safety, is beneficial to reduce an alkali content in the concrete, and can effectively reduce the risk of bleeding of the concrete.
Owner:北京金隅水泥节能科技有限公司 +1
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