14results about How to "Increase slump" patented technology

The invention discloses an anti-mud polycarboxylic acid water reducer and a preparation method thereof, the anti-mud polycarboxylic acid water reducer comprises the following raw materials by weight: 300-350 parts of ethylene glycol monovinyl polyethylene glycol ether, 20-45 parts of acrylic acid, 10-30 parts of maleic anhydride, 10-30 parts of sodium hypophosphite, 10-30 parts of a chain transfer agent, 10-30 parts of an initiator, 10-30 parts of a neutralizer, 10-30 parts of an anti-mud sacrificial agent and 10-30 parts of water. The anti-mud anti-corrosion coating is prepared from the following components in parts by weight: 40 to 70 parts of maleic anhydride, 10 to 30 parts of sodium hypophosphite, 20 to 40 parts of chain transfer agent, 10 to 20 parts of initiator, 20 to 30 parts of neutralizer, 5 to 10 parts of anti-mud sacrificial agent and 340 to 495 parts of water. The composite water reducing agent has large steric hindrance, intercalation adsorption of the composite water reducing agent in soil can be reduced, the soil resistance is enhanced, and the slump of the composite water reducing agent is increased; the anti-mud sacrificial agent is introduced, so that the water-reducing rate of the polycarboxylate superplasticizer is increased, and effective components of the polycarboxylate superplasticizer are fully reacted; the preparation process is simple, environment-friendly and easy for industrial production.

The application discloses a preparation method of low-shrinkage low-heat low-carbon concrete, and has the technical characteristics that high-water-absorption autoclaved silicate functional aggregate is used to replace gravel and yellow sand, and the mass sum of fly ash and mineral powder in the cementing material can be up to 60% at most. The high-water-absorption water-saturated autoclaved silicate functional aggregate and the expanding agent are added into the concrete, the humidity is released through the functional aggregate, the internal curing and the expansion of the expanding agent are cooperated, the self-shrinkage, the drying shrinkage and the hydration heat shrinkage of the concrete are reduced, and the strength of the concrete is improved; the grading of the fine aggregate of the superfine yellow sand is improved through the addition of the fine functional aggregate, the working performance of the concrete is improved, and the low-carbon environmental protection of the concrete is realized through the large amount of mineral admixtures.

The invention provides a method for preparing polymer environmentally friendly recycled concrete. The recycled concrete comprises the following raw materials in parts by weight: 500-800 parts of recycled concrete, 200-500 parts of cement, 25-50 parts of fly ash, 18-28 parts of silicate particles, 58-89 parts of polymer emulsion, 15-35 parts of glass fiber, and 13-30 parts of water reducer. The recycled concrete is prepared by screening raw materials, adding admixtures, adding polymers, adding additives, casting and molding, curing and hardening, etc., so as to effectively improve the mechanical properties of the recycled concrete and reduce the chloride ion content in the recycled concrete. The recycled concrete of the invention has good environmental protection, high strength and good durability, saves costs, and is convenient for construction. It is an environmentally friendly, high-strength and highly durable new building material and can be used as research in various concrete structure projects, such as buildings, roads and bridges, underground projects and the like.

This invention belongs to the field of high-efficiency concrete water-reducing agents, specifically relating to a composite polycarboxylate anti-mud water-reducing agent, its preparation method, and its application. The composite polycarboxylate anti-mud water-reducing agent comprises the following raw materials: 30-40 parts by weight of anti-mud polycarboxylate water-reducing agent and 1-3 parts by weight of anti-mud sacrificial agent. The anti-mud polycarboxylate water-reducing agent is polymerized from methyl allyl polyoxyethylene ether and unsaturated carboxylic acid under the initiator and chain transfer agent. The anti-mud sacrificial agent is obtained by adding 4-5 parts by weight of hydrogen peroxide to 20-30 parts by weight of papermaking black liquor. The anti-mud sacrificial agent effectively resists the interference of soil on the polycarboxylate water-reducing agent and is simple to prepare, environmentally friendly, and pollution-free. The composite polycarboxylate anti-mud water-reducing agent prepared by this invention has good anti-mud properties, exhibits good dispersibility in mud-containing concrete, and also has good slump retention properties.

The present invention provides a dry mix composition consisting of a low viscosity cellulose ether (50 to 750 mPa-s at 1 wt% solids, 20°C and 514 s-1 shear rate using a strain controlled rotational rheometer (e.g., ARES-G2 TM , TA Instruments)), a graded aggregate, and a hydraulic cement, or a granular wet cement composition consisting of the cement, a graded aggregate, and an admixture including the cellulose ether. The wet granular hydraulic cement composition behaves like an asphalt composition and has a zero or near zero slump, high lubricity, and water from 5 wt% to less than 13 wt%, or preferably greater than 5 wt% to 10.5 wt% based on the total weight of the granular wet cement composition. The low viscosity cellulose ether enables lubricity without compromising compaction and without causing air entrainment.

The application provides a preparation process of concrete with tunnel hole slag as raw material. The preparation process of concrete with tunnel hole slag as raw material comprises the following steps: crushing the tunnel hole slag and performing primary screening; finely crushing and preparing machine-made sand through a single production process; dry mixing main materials such as cement; mixing basalt fibers and polypropylene fibers; and preparing a mixed solution and stirring and mixing. The application can improve the impermeability and frost resistance of the prepared concrete by mixing and doping basalt fibers and polypropylene fibers which have acid and alkali resistance.

The application discloses a kind of low additional water full recycled concrete based on recycled fine aggregate wet packing gradation optimization and preparation method thereof, belong to building material technical field.The application is classified into three intervals by natural gradation recycled fine aggregate, after pre-wetting to saturated surface dry state, the wet loose bulk density under each mass proportion combination is determined, and the highest density is selected as the optimal artificial gradation;60% of the saturated surface dry water absorption of all recycled aggregates is determined as additional water;cement, recycled fine aggregate, recycled coarse aggregate, initial water and water reducing agent are used to prepare by using the layered feeding process of "cement pre-mixing→ neat paste preparation→ coarse aggregate→ fine aggregate".The obtained concrete has a slump of 160-190mm, a 28-day compressive strength of 25-40MPa, good fluidity, can meet the construction requirements of conventional concrete structure, and does not need chemical modification, low cost, suitable for building solid waste large-scale utilization.

The invention discloses a low-carbon cementitious material additive for concrete and a preparation method thereof. The additive is made of the following raw materials in parts by weight: 80-120 parts of composite slag powder, 100-250 parts of composite gelling agent, 10-30 parts of water reducer, 6-18 parts of activator, 5-20 parts of reinforcing agent, 10-30 parts of adhesive, and 10-30 parts of stabilizer. The combined use of copper tailings powder and nickel tailings powder in the additive of the present invention can significantly enhance the mechanical properties of concrete prepared with natural sand as aggregate, and synergistically enhance the effect; using ferrous sulfate and polyvinyl acetate as composite gelling agents, the slump of concrete slurry is improved, and synergistically enhance the effect.

A special cement for wind power generation concrete tower and a preparation method thereof belong to the technical field of cement. The cement comprises the following components by weight: 80-85 parts of clinker, 3-5 parts of gypsum, 3-4 parts of stone, 8-12 parts of mineral powder and a grinding aid; the content of tetracalcium aluminoferrate in the clinker is ≥14%, and the alkali content is 0.45-0.55%; the steps are as follows: (1) adding clinker, gypsum and stone to a roller press for extrusion to obtain component A; (2) component A is selected by a powder selector and then mixed with a grinding aid to obtain component B; (3) the mineral powder and the milled component B are mixed to obtain a special cement for wind power generation concrete tower. The special cement for wind power generation concrete tower prepared by the present invention has high compressive strength; it has high adaptability by adopting low-alkali clinker, and the content of tetracalcium aluminoferrate in the clinker is ≥14%, so that it has high flexural strength; the proportion of clinker in the special cement for wind power generation concrete tower is high and the proportion of other auxiliary materials is low, so the water consumption of cement standard consistency can be effectively reduced.

The application relates to a graphene oxide strong agent and a preparation method and application thereof, and raw materials for preparing the graphene oxide strong agent include a graphene oxide dispersion liquid, modified starch, polyethylene glycol, hydroxypropyl methyl cellulose, a polycarboxylic acid water reducing agent and water. Graphene has excellent mechanical properties and can be used as a filler to increase the compactness of concrete, but is limited in the application in concrete due to dispersion problems. A special dispersant is selected in the application, which can fully disperse graphene oxide to form a stable solution, prevent adsorption of graphene on a water reducing agent, and even maintain the stability of the solution after being compounded with other materials, so that the workability of concrete is improved and the strength of the concrete is improved.

The invention discloses concrete with high compression resistance and corrosion resistance and a preparation method thereof, and relates to the technical field of concrete. Firstly, undecylenic aldehyde is grafted on the surface of polyvinyl alcohol, so that the mechanical strength and the corrosion resistance of the concrete are improved; according to the present invention, the mechanical strength and the thermal stability are significantly improved, the corrosion resistance of the concrete is improved, the sulfonate is decomposed to absorb heat during combustion, the decomposition combustion speed is slowed down, the carbonized layer is formed, the silicon element is assisted, the thermal stability is improved, and the corrosion resistance of the concrete is improved; the ignition point is improved and the flame-retardant effect is enhanced. The modified polymer emulsion is prepared by enabling allyl trimethyl ammonium chloride and allyl alcohol glycidyl ether to participate in styrene acrylate polymerization reaction, cations are introduced, the corrosion speed is slowed down, glycidyl ether is assisted, and the mechanical strength and durability of the concrete are improved. And the two are mixed and filled with concrete, so that the effects of high pressure resistance, corrosion resistance and flame retardance are achieved.

The invention relates to the technical field of concrete, and particularly discloses concrete for a C50 prestressed fabricated box girder and a preparation method of the concrete. The concrete for the C50 prestressed fabricated box girder is prepared from the following raw materials in parts by weight: 400 parts of cement; 150 to 160 parts of water; 100 parts of mineral powder; 30 parts of fly ash; 600 to 700 parts of natural sand; 100 to 150 parts of stone chips; 500 to 600 parts of limestone; 400 to 500 parts of natural river stone; 3-4 parts of a composite water reducing agent; 7-8 parts of other additives; the composite water reducing agent is an esterification product of graphene oxide and PCE, and the other additives comprise a water-retaining agent and an air entraining agent; the preparation method comprises the following steps: mixing the raw materials, and uniformly stirring to obtain the concrete for the C50 prestressed fabricated box girder. The concrete provided by the invention has the advantages of excellent anti-pressure ability and good fluidity.

The invention provides a high-strength early-strength cement-based composite material and a preparation method thereof. The high-strength early-strength cement-based composite material is prepared from the following components in parts by weight: 400 to 450 parts of ordinary Portland cement, 20 to 25 parts of silica fume, 7 to 12 parts of modified polypropylene fiber, 80 to 90 parts of waterborne epoxy resin emulsion, 1 to 3 parts of modified nano material, 10 to 12 parts of polyamine curing agent, 530 to 580 parts of quartz sand, 5 to 12 parts of hydroxypropyl methyl cellulose and 60 to 80 parts of rapid hardening agent. 4-7 parts of a water reducing agent and 1-3 parts of a defoaming agent. The high-strength early-strength cement-based composite material prepared by the invention has excellent mechanical strength, good impermeability and high early strength.

The present invention relates to the technical field of functional building materials, and discloses a lightweight reinforced concrete for prefabricated buildings and a preparation method thereof. The lightweight reinforced concrete comprises the following raw material components by weight: 320-340 parts of PO 42.5 ordinary Portland cement, PO 52.5 100-120 parts of ordinary Portland cement, 30-50 parts of fly ash, 20-30 parts of silica fume, 5-10 parts of metakaolin, 200-220 parts of fine aggregate, 50-100 parts of fly ash floating beads, 600-700 parts of modified lightweight coarse aggregate, 5-7 parts of polycarboxylic acid high-efficiency water reducer, 15-20 parts of reinforcing fiber, and 145-160 parts of water; the surface of the modified lightweight coarse aggregate is a two-layer modified interface, including a first interface with elastic function and a second interface with compactness, which effectively prevents the concrete from being crushed; through the control of the particle size grading of Portland cement and the combination of admixtures, a stronger hydration product is formed with better self-compactness, thereby enhancing the compression and flexural properties of the concrete; the early strength of the concrete is improved, and the demolding cycle of prefabricated concrete components of prefabricated buildings is shortened.