67results about How to "Good plastic protection effect" patented technology

The invention belongs to the technical field of a concrete admixture in building materials and provides a slow-release type polycarboxylic water reducing agent, a preparation method thereof and application. The slow-release type polycarboxylic water reducing agent is synthesized by adopting a free-radical polymerization method in an aqueous solution. The slow-release type polycarboxylic water reducing agent is prepared by unsaturated polyoxyethylene ether, unsaturated acid or a mixture of unsaturated acid ester and the unsaturated acid, a chain transferring agent, an oxidizing agent, a reducing agent and water. The slow-release type polycarboxylic water reducing agent has the advantages of low doping amount, good plasticity-maintaining effect, good cement adaptability and good energy-saving and environmental-friendly effects and the like; the production process is simple; the equipment investment is less and the cost is low; by the adoption of the water reducing agent, water reducing components can be gradually released, and the content of the effective water reducing components in the concrete is guaranteed, and the plasticity of the concrete is maintained, and the cement hydration can be delayed, further the maintaining capability for the slump and the fluidity is excellent for concrete with large slump and concrete with medium and small slump respectively, and the large-volume concrete cracks generated by over-high hydration temperature can be reduced, and the mixability and the mechanical property of the concrete can be improved.

The invention discloses a concrete retarder which is prepared from the following components in parts by weight: 4-6 parts of ammonium phosphate, 5-7 parts of ammonium sulfate, 6-8 parts of sodium tripolyphosphate, 10-15 parts of amino trimethylene phosphonic acid, 3-7 parts of gelatin, 1-3 parts of glycerol, 2-4 parts of sodium citrate, 10-15 parts of zeolite powder, 10-15 parts of pumice powder, 3-5 parts of water reducer, 1-3 parts of dispersant and 0.4-0.6 part of surfactant. The concrete retarder has the advantages of good retarding effect, high strength, no pollution and the like, and is a concrete additive with developing future.

The invention relates to a nuclear-power concrete air-entraining polycarboxylic acid additive which comprises the following substances: by weight, 60-80% of a ZWL-PC-II polycarboxylic acid water reducer, 1-8% of gluconic acid sodium salt, 0.5-3% of white sugar, 0.01-0.3% of a polyether antifoaming agent, 0.1-1% of a ZWL-II air-entrainer, 0-0.5% of Welan gum, and the balance water. According to the invention, Welan gum is used as a plastic retaining agent to control bleeding of concrete and sedimentation of cobblestone; By binary complex formulation of two retarders, namely sodium gluconate and white sugar, coagulation time of concrete is delayed, and early-stage heat of hydration of concrete is reduced; as the ZWL-II air-entrainer which fits with the ZWL-PC-II polycarboxylic acid water reducer is adopted, tiny, uniform and stable steam bubbles are introduced such that slump and gas content loss result of concrete completely meet construction requirements of nuclear-power concrete.

The invention provides a sulfoaluminate-Portland cement composite system additive and prepared sulfoaluminate-Portland cement-based fast-hardening early-strength concrete. The sulfoaluminate-Portland cement composite system additive is prepared from components in percentage by mass as follows: 70%-78% of a water reducing agent, 1.2%-2.5% of an early-strength agent, 18%-25% of a retarder and 2%-4% of an anti-freezing agent. The sulfoaluminate-Portland cement composite system additive can significantly improve the initial flow performance of the sulfoaluminate-Portland cement-based concrete, delay the setting time of a cement composite system, reduce the slump loss and effectively resolve the contradiction between liquidity and early strength and has composite effects of water reduction, delayed coagulation, early strength and the like, and a related preparation method is simple and suitable for popularization and application.

Disclosed are a polycarboxylic water reducer applicable to manufactured sand and a preparation method of the polycarboxylic water reducer. 96616 polycarboxylic water reducer mother liquor with the solid content of 40% is compounded with fatty alcohol sulphonate and polyether polyol to form the polycarboxylic water reducer. The preparation method includes adding the 96616 polycarboxylic water reducer mother liquor with the solid content of 40% into a reaction kettle; controlling the temperature to range from 25 DEG C to 30 DEG C; adding water and the fatty alcohol sulphonate while stirring; adding the polyether polyol after reacting for 30-50 minutes; and obtaining the polycarboxylic water reducer which has the solid content of 10% and is applicable to the manufactured sand after reacting for 1-1.5 hours at constant temperature. The polycarboxylic water reducer has the advantages that workability and flowing retention ability of manufactured sand class concrete are improved, and work performances of the concrete are enhanced. The preparation method is simple and facilitates production.

The invention discloses a preparation method of a fluorine-containing shrink-reduced polycarboxylate water reducing agent. The method particularly includes: 1) preparation of a polycarboxylate water reducing agent prepolymer: under effects of an initiator, a reducing agent and a chain transfer agent, performing a redox radical polymerization reaction to a carbonyl-containing monomer, an unsaturated acid monomer and an unsaturated macro-monomer to obtain a carbonyl-containing polycarboxylate water reducing agent prepolymer; 2) preparation of the fluorine-containing shrink-reduced polycarboxylate water reducing agent: performing a nucleophilic substitution reaction to the carbonyl-containing polycarboxylate water reducing agent prepolymer with a Prakash reagent (TMSCF3) to obtain the water reducing agent. The water reducing agent can significantly reduce surface tension and improve cement dispersibility, is high in shrinkage reducing performance on the basis of high water reduction, is good in compatibility with cement, is low in gas content when being applied to concrete, can effectively improve size stability of concrete and reduce shrinkage cracking and can improve the durabilityand service life of a concrete structure.

The invention relates to the technical field of concrete materials, in particular to anti-crack concrete and a preparation method thereof. The anti-crack concrete comprises the following components inparts by weight: 90-110 parts of Portland cement, 45-60 parts of water, 160-210 parts of gravels, 120-140 parts of sand, 20-30 parts of fly ash, 15-20 parts of a composite anti-crack agent, 9-12 parts of an additive and 2-5 parts of a composite water reducing agent. According to the invention, the composite anti-cracking agent is matched with the Portland cement, the fly ash, the admixture, the composite water reducing agent and other components, the compactness and the compressive strength of the anti-crack concrete can be improved, and the waterproof and shrinkage compensation effects of the concrete can be achieved, so that the prepared anti-crack concrete has excellent crack resistance, permeability resistance and compressive strength and is long in service life. The preparation method is simple and efficient, convenient to operate and control, stable in product quality and beneficial to industrial production.

The invention relates to a hydraulic concrete surface layer slit sealing method belonging to a hydraulic concrete slit sealing method and comprising the following formula method: the formula contains 1000-1400 parts of general purpose portland cement PO42.5, 1100-2000 parts of medium coarse sand, 0-600 parts of chicken girt, 300-360 parts of water and a composite material; the method comprises the following steps of: (1) cutting a concrete surface layer crack; (2) cleaning the base surface of the concrete crack; and (3) preparing the composite material in the proportion of the formula, stirring the composite material with cement, the medium coarse sand and the water for 3 min at the stirring speed of 2000-2500R/min to form a cement gel material, and then pouring the cement gel material into slits. The invention is suitable for hydraulic concrete dam face slit treatment with better effect.

The invention relates to the construction field, and in particular relates to a high corrosion-resistant marine cement cementing material and a preparation method thereof, and the high corrosion-resistant marine cement cementing material comprises 20-25 parts of wollastonite; 80-100 parts of sulphoaluminate cement; 30-50 parts of nano-like hydrotalcite; 20-30 parts of fiber; 80-100 parts of coralreef sand; 50-60 parts of polyacrylamide; 20-30 parts of modified acrylic emulsion and 10-15 parts of additives; the invention aims to overcome the defects of the prior art and provide the high corrosion-resistant marine cement cementing material and the preparation method thereof. The high corrosion-resistant marine cement cementing material has the characteristics of good mechanical strength, durability and corrosion resistance, improved bending strength, improved cement density, better flocculation property, capability of reducing friction resistance between liquids, excellent impermeability, quick hardening, early strength, high later strength and the like.

The invention provides a novel polycarboxylic acid type cement additive. The novel polycarboxylic acid type cement additive is formed by copolymerization of macromonomers containing polyoxyethylene ether groups and polymerization additives. The macromonomers contain the polyoxyethylene ether groups, and the molecular weight of the macromonomers is within 500-3000. The polymerization additives comprise comonomers, initiators, molecular weight modifiers and deionized water. The invention further provides a synthesis method of the novel polycarboxylic acid type cement additive. The method includes the steps of firstly, conditioning the macromonomers; secondly, blending the polymerization additives; thirdly, performing polymerization; fourthly, performing postprocessing. According to the novel polycarboxylic acid type cement additive, macromonomers with different molecular weights are mixed to obtain the macromonomers with wide molecular weight distribution to combine with proper polymerization technologies, and therefore the synthesized polymer can be better dispersed and extended structurally; accordingly, functions of all units in the polymer can be developed to the maximum degree, and the novel polycarboxylic acid type cement additive is excellent in performance especially in plasticity-maintaining performance and water reducing performance.

The invention discloses a water-reducing agent containing peanut shell powder. The water-reducing agent containing peanut shell powder is prepared by mixing the following raw materials in parts by weight: 30-50 parts of aromatic sulfamate formaldehyde condensate, 15-25 parts of sodium methylene bis-naphthalene sulfonate, 5-10 parts of 2-ethylhexyl phosphate, 10-15 parts of abitol polyoxyethylene ether monosulfosuccinate, 8-12 parts of fluoroplast, 10-15 parts of polyethyleneimine, 3-5 parts of erucamide, 4-8 parts of 8-hydroxyquinoline potassium sulfate, 3-6 parts of peanut shell powder, 5-10 parts of sea mud, 10-15 parts of waste mortar, 5-10 parts of collagen freeze-dried powder, 8-12 parts of sodium pyrrolidonecarboxlate, 5-10 parts of polyamide-epichlorohydrin resin, and 4-8 parts of auxiliaries. The water-reducing agent is high in water reducing rate which is up to more than 20%, excellent is plasticity retention property, good in cement adaptability, convenient to use, free from influence on properties by being directly doped into concrete, capable of improving the mobility, anti-seepage property and durability of the concrete, and wide in the range of application.

The present invention discloses one kind of freeze-thaw resisting cement and its production process. The material consists of clinker 90-92 wt%, limestone 4.5-6 wt%, and gypsum 4.2-5.0 wt%, and the clinker has KHú¢0.90+/-0.02, nú¢1.80+/-0.10 and pú¢0.90+/-0.10. It has the mineral composition of: C3Sú“54.0 wt%, C2Sú¥20.0 wt%, C3Aú“6.0 wt%, C4AFú¥14.0 wt%, and f-CaO less than 1.5 wt%. The freeze-thaw resisting cement has specific surface area over 350 sq m/Kg and fineness below 2.5 %, and after 250 times of freeze-thaw, it has 3-day breaking strength over 5.0 Mpa and compression strength over 25.0 Mpa, and 28-day breaking strength over 7.0 Mpa and compression strength over 50.0 Mpa. It has low C3A content, good freeze-thaw resisting performance, fast curing, high wear resistance and high permeation resistance.

The invention discloses a preparation method of white carbon black-doped high performance concrete. The method comprises the following steps: taking 16-20 parts by weight of Portland cement, 0.1-0.5 parts by weight of silicon micro-powder, 28-35 parts by weight of hill sand, 33-41 parts by weight of broken stones, 5-7 parts by weight of water, 0.3-0.6 parts by weight of an additive and 1-2 parts by weight of white carbon black, and processing above raw materials through an improved concrete production technology to obtain the white carbon black-doped high performance concrete. The strength of the concrete can reach 60-80MPa, the slump can reach 210-230mm, the extended degree can reach 550-630mm, the pouring time is shorter than 5s, and the concrete also has the advantages of low cost and very wide market prospect.

The invention discloses methacryloyloxyethyl-dimethyl ammonium propanesulfonate and a preparation method and the molecular structure thereof. The method includes the steps that 1,3-propanesultone monomers and 2-(dimethylamino)ethyl methacrylate monomers with different use amounts are weighed first, a 1,3-propanesultone monomer acetone solution and a 2-(dimethylamino)ethyl methacrylate monomer acetone solution which are prepared in advance are added into a round-bottom flask in different adding modes, and a one-step reaction is carried out for a certain time under the light-proof condition; ice-water bath cooling, suction filtration and vacuum drying are carried out, and the finished product is obtained. Methacryloyloxyethyl-dimethyl ammonium propanesulfonate has excellent dispersing performance, superior plasticity maintaining performance and high early strength performance on cement systems or concrete; meanwhile, the potential hazard of reinforcement corrosion caused when methacryloyloxyethyl-dimethyl ammonium propanesulfonate is applied to reinforced concrete can be eliminated.

The invention discloses a wet-mixed mortar admixture. The wet-mixed mortar admixture comprises a plastic regulating agent and a coagulation regulating agent, wherein the plastic regulating agent is prepared from components as follows: 5%-15% of a water reducer, 0.5%-2% of a water retaining agent, 0.5%-1.5% of an additive, 0.1%-0.6% of a shrinkage reducing agent, 0.5%-3% of a thixotropic lubricant, 0.2%-0.4% of a cosolvent and the balance of water; the coagulation regulating agent is prepared from components as follows: 5%-15% of a retarder, 0.2%-2% of a plastic retaining agent, 1%-3% of a stabilizer and the balance of water. The wet-mixed mortar admixture comprises the plastic regulating agent and the coagulation regulating agent, mortar has good plastic retaining property and workability due to mixing of the double components, the opening time is greatly prolonged, and the compressive strength and the adhesion stress of the mortar are improved.

The invention discloses a composite concrete retarder, made from, by weight, 2-6 parts of sodium fluorosilicate, 3-9 parts of sodium dihydrogen phosphate, 4-8 parts of ammonium bicarbonate, 4-6 parts of ammonium persulfate, 7-9 parts of glycine, 2-6 parts of sodium carboxymethyl cellulose, 2-4 parts of shell-lac, 1-3 parts of ammonium oxalate, 10-15 parts of halloysite, 15-20 parts of Al2O3-ZrO2 porous ceramic powder, 2-5 parts of a water-reducing agent, 1-3 parts of a dispersant, and 0.3-0.6 part of a surfactant. The composite concrete retarder has the advantages of good retarding effect, high strength, zero pollution and the like, and is a concrete admixture that is promising.

The invention relates to the technical field of concrete materials, in particular to a corrosion-resistant concrete material and a preparation method thereof. The corrosion-resistant concrete materialis prepared from the following components in parts by weight: 90 to 110 parts of Portland cement, 70 to 100 parts of water, 170 to 230 parts of gravel, 120 to 140 parts of sand, 20 to 30 parts of flyash, 11 to 16 parts of additive, 2 to 5 parts of composite water reducing agent and 10 to 15 parts of calcium oxide-calcium sulphoaluminate composite expanding agent. The corrosion-resistant concretematerial has good corrosion resistance, impermeability and compressive strength and is long in service life; the preparation method is simple and efficient, operation and control are convenient, theproduct quality is stable, and industrial production is facilitated.

The invention discloses a chlorine-free concrete and mortar waterproof agent, and belongs to the technical field of additive. The chlorine-free concrete and mortar waterproof agent is prepared from, by weight, 80 to 90 parts of blast furnace slag, 20 to 25 parts of an expanding agent, 18 to 22 parts of furan resin, 15 to 20 parts of a naphthalene water reducer, 15 to 20 parts of sepiolite powder, 12 to 18 parts of cyclodextrin, 10 to 15 parts of nano silicon micro powder, 10 to 15 parts of organic bentonite, 8 to 12 parts of sugarcane wax, 6 to 10 parts of palmitic acid, 5 to 8 parts of hydrogenated castor oil, and 250 to 300 parts of water. The chlorine-free concrete and mortar waterproof agent possesses stable and reliable water resistance; insoluble silicates can be obtained via reaction of the active ingredients of the chlorine-free concrete and mortar waterproof agent with cement hydration products, so that water seepage channels can be blocked, and water tightness and impermeability of concrete and mortar are improved greatly.

The invention relates to the technical field of building admixtures, specifically to a stabilizer-plasticizer for wet mixed mortar and a preparation method thereof. The preparation method comprises the following steps of: mixing 4-hydroxybutylvinyl polyoxyethylene ether monomer, acrylic acid, methylacryloyloxyethyl succinate and water, and adding hydrogen peroxide; carrying out a reaction, and then sequentially adding an aqueous solution of a reducing agent, an aqueous solution of a cocatalyst, and an aqueous solution composed of acrylic acid, 2-amino-3-p-hydroxyphenylpropionate, 3-dihydromyrcenol hydroxyphenylphosphinyl propionate and a chain transfer agent; and after a reaction is completed, adding polyvinyl alcohol and adjusting a pH value to 7 to 8 to prepare the stabilizer-plasticizer for wet mixed mortar. Compared with the prior art, mortar synthesized by using the stabilizer-plasticizer for wet mixed mortar provided by the invention has the advantages of low consistency loss, good water retention rate, high compressive strength, high long-term stability and the like, so significant progress is made.