14314 results about "Water reducer" patented technology

Cementitious compositions and methods for making same, in which the cementitious compositions include 35-60 wt. % cementitious reactive powder (also termed Portland cement-based binder), 2-10 wt. % expanded and chemically coated perlite filler, 20-40 wt. % water, entrained air, and optional additives such as water reducing agents, chemical set-accelerators, and chemical set-retarders. In addition, the lightweight cementitious compositions may contain 0-25 wt. % on a wet basis secondary fillers such as expanded clay, shale aggregate, and pumice.

The invention provides a ceramsite water permeable brick, which comprises the following components by weight: 80-100 parts of ceramsite, 10-15 parts of silicon sand, 20-40 parts of cement, a setting accelerator accounting for 2-4% of the weight of the ceramsite, and a water reducing agent accounting for 2-4% of the weight of the ceramsite. According to the invention, silicon sand dust made ceramsite is combined with a small quantity of cement, the setting accelerator, the water reducing agent and a silicon sand fabric to manufacture the ceramsite water permeable brick. One the one hand, the water permeable brick has a beautiful appearance, and on the other hand it combines the lightweight and high strength characteristics of ceramsite. At the same time, ceramsite is round stone rather than polygonal, and usually the gap between round objects is larger than that between polygonal objects, so that the prepared water permeable brick has good permeability effect. The water permeable brick prepared by the method has compressive strength of greater than or equal to 30Mpa and a permeability coefficient of greater than or equal to 0.05cm / s, and the other properties of the brick meet the JCT945-2005 industrial standard.

The invention discloses a water permeable brick and a preparation method thereof. The water permeable brick comprises two parts, namely a surface layer and a base layer, wherein the material of the surface layer is prepared from the following components in percentage by mass: 60-70% of ceramic sand, 15-20% of sand and 15-20% of cement, and in addition to the solid components with the sum of 100% in percentage by mass, water accounting for 50-60% by mass of cement is further added; and the material of the base layer is prepared from the following components in percentage by mass: 45-65% of building silt unburned ceramsite, 10-15% of cement, 5-10% of fly ash, 10-15% of melon seed-shaped drug slices and 10-15% of sand, and in addition to the solid components with the sum of 100% in percentage by mass, the water accounting for 30-40% and a water reducer accounting for 1-1.5% relative to total mass of the cement and the fly ash are further added. The water permeable brick disclosed by the invention is prepared by using the building silt unburned ceramsite to replace natural aggregate or calcined ceramsite, on one hand, the using ways of the building silt unburned ceramsite can be expanded, the utilization rate of solid wastes is improved, and negative effects on an environment are reduced, and on the other hand, the obtained water permeable brick has excellent performance.

A highly durable and easy to use prefabricated construction product is disclosed having a cellular concrete component sandwiched between two cement boards, wherein the cellular concrete component comprises cement, fly ash, an activating agent and water, and the cement boards comprise cement, fly ash, an activating agent, sand, silica fume, a water reducer agent, a reinforcing fiber, and water.

A thermally conductive cement-sand grout for use with a geothermal heat pump system. The cement sand grout contains cement, silica sand, a superplasticizer, water and optionally bentonite. The present invention also includes a method of filling boreholes used for geothermal heat pump systems with the thermally conductive cement-sand grout. The cement-sand grout has improved thermal conductivity over neat cement and bentonite grouts, which allows shallower bore holes to be used to provide an equivalent heat transfer capacity. In addition, the cement-sand grouts of the present invention also provide improved bond strengths and decreased permeabilities. The cement-sand grouts can also contain blast furnace slag, fly ash, a thermoplastic air entraining agent, latex, a shrinkage reducing admixture, calcium oxide and combinations thereof.

The invention relates to a polyether class polycarboxylic acid high-efficiency water reducing agent and a preparation method thereof, belonging to the field of concrete materials, structures and engineering of building materials. The polyether class polycarboxylic acid high-efficiency water reducing agent raises the temperature of water solutions of 15-55 mass percent of allyl polyethenoxy ether and 0-6 mass percent of chain transfer agent is raised to 50-90 DEG C, one side is dropwise added with a water solution of 0.01-0.9 mass percent of an evocating agent, one side is dripwise added with miscible liquids of 3-15 mass percent of unsaturated acids and one or more than one derivative thereof, the temperature is kept unchanged, and the water solution and the miscible liquids are completely dropped within 2-6 hours, the temperature is preserved for 1-6 hours and naturally cooled to room temperature, and the mixed solution is neutralized by sig water till a PH value reaches 6.8-7.2 so as to obtain the polyether class polycarboxylic acid high-efficiency water reducing agent. The polyether class polycarboxylic acid high-efficiency water reducing agent and the preparation method thereof have simple technique, low cost and good property, can effectively reduce the water-cement ratio of concrete, improves the compaction rate of a pore structure of the concrete, enhances the strength and the durability of the concrete and has great significance on enhancing the engineering quality, prolonging the service life, reducing the engineering cost, reducing the environment pollution, and the like.

The invention provides a cement-based composite material used for a 3D printing technology as well as a preparation method and application thereof. The cement-based composite material is prepared from the following raw materials based on the total weight of the composite material: 33%-40% of cement, 0%-8% of inorganic powder, 32%-38% of tailing machine-made sand, 2.5%-3% of a high-molecular polymer, 0.1%-0.5% of a water reducing agent and 16.7%-20% of mixing water; a composite thickening time control agent, a thixotropic agent, a volume stabilizer and the like are added into a mixture to prepare an inorganic composite material; and then the inorganic composite material can be directly pumped into a 3D printer for building to be applied to construction. The cement-based composite material is an inorganic material and the materials are easily available; a lot of industrial waste materials can be used; therefore, the cement-based composite material is low in cost, energy-saving and environment-friendly; the condensation time can be flexibly controlled, and the material has super early strength, good caking property and strong stability; the requirements of 3D printing construction continuity of the building and the building strength are met so that the house building has good global stability and use safety; and the application and popularization of 3D printing technology can be greatly promoted.

The invention relates to a high-performance water reducer of polycarboxylic acid, and a preparation method thereof, belonging to the technical field of concrete admixtures in construction industry. The water reducer is prepared by 55-90% of polyoxyethylene ether or ester containing unsaturated double bonds, 8-30% of unsaturated carboxylic acid and derivative thereof, 0-25% of unsaturated sulfonic acid and salt thereof, 0-15% of unsaturated carboxylic esters, and 0.5-5% of redox initiator. The high-performance water reducer of polycarboxylic acid prepared by the invention has the advantages of high water-reducing rate and collapse protectiveness, and has good adaptability for base materials. The water reducer provided by the invention is featured with simple technology, easy material getting, no pollution and low cost, and is industrially produced easily.

The invention belongs to the technical field of concrete additives in building materials. The high water reduction high collapse protection type polycarboxylate high-performance water reducer mainly comprises the following monomer components: unsaturated methyl vinyl polyoxyethylene ether (A), a chain transfer agent (B), a mixture (C) of one or more of unsaturated acid and unsaturated acid derivatives, an oxidant (D) and a reducing agent (E), wherein the molar ratio A: B: C: D: E of the monomers is 1:0.01-0.5:2-8:0.08-0.5:0.02-0.3. The high water reduction high collapse protection type polycarboxylate high-performance water reducer is prepared by regulating the polymer mass concentration to between 20 and 40 percent by using water, and polymerizing a redox initiator system at normal temperature. The water reducer has the advantages of low doping amount, high water reducing ratio, excellent slump retaining capacity, and high cement adaptability, and the technology has the advantages of no need of extra heat source, implementation at normal temperature, low equipment investment, low cost and suitability for large area popularization and application.

The invention relates to an oxidized graphene and graphene reinforced cement based composite material and a preparation method thereof. The oxidized graphene and graphene reinforced cement based composite material comprises the oxidized graphene, the graphene, a dispersing agent, a thickening stabilizer, a water reducer, a defoaming agent and a cement matrix, the mass ratio of the total mass of the oxidized graphene and the graphene to the cement matrix is (0.0005-0.5):1, and the mass ratio of the total mass of oxidized graphene and the graphene to the dispersing agent to the water reducer to the thickening stabilizer to the defoaming agent is 1:(0.05-10):(0.1-20):(0.1-20):(0.05-5). In the composite material, the oxidized graphene and the graphene are dispersed in the cement matrix uniformly; compared with the traditional cement material, the tensile strength, rupture strength and conductivity of the composite material are all improved remarkably; and the composite material has more excellent mechanical property and electrical property, and is applicable to the field of multifunctional construction materials.

The invention relates to a cement-based shrinkage-free joint filling sealing mortar for doors and windows and a preparation method and a construction method thereof. The sealing mortar is prepared by the components in parts by weight as follows: 100 parts of cement, 0-80 parts of active admixture, 0.01-10 parts of water reducer, 0.01-10 parts of early strength agent, 0.01-10 parts of thickening time control agent, 0-25 parts of expanding agent, 0-30 parts of binder, 0-10 parts of air entraining agent, 0.01-30 parts of plastic retaining agent, 0.01-10 parts of moisture repellent, 0-5 parts of starch ether, 0-150 parts of powder filler and 0-300 parts of aggregate. Compared with the prior art, the mortar provided by the invention has the advantages of no shrinkage, strong binding power, no falling, good anti-permeability, simpleness in construction, efficiency and the like, and can adequately fill joints of doors and windows to ensure the sealing property around the doors and windows, and water is prevented from being seeped into the doors and windows.

The invention relates to a controlled / slow release polycarboxylate water reducing agent for inhabiting the aggregate mud content influence, which is characterized in that the controlled / slow release polycarboxylate water reducing agent comprises the following ingredients by weight parts: 75 to 95 parts of polycarboxylate water reducing agents, 2 to 5 parts of retarders and 5 to 25 parts of slow release agents. Because natural zeolite powder has the characteristics of microporous structure, large specific surface area and strong surface absorption capability, the natural zeolite powder can be used as the slow release agents. The invention utilizes the natural zeolite powder as the slow release agents, and the surface of the natural zeolite powder can absorb a large number of polycarboxylate water reducing agents and a small number of retarders after the natural zeolite powder is mixed with the polycarboxylate water reducing agents and the retarder. Clay can preferentially absorb the natural zeolite powder with strong surface absorption capability when the natural zeolite powder is doped into concrete to be stirred with gelled materials, aggregates and water, and the excessive absorption of the polycarboxylate water reducing agent by the clay is avoided, so the absorption of the polycarboxylate water reducing agents on cement grains and the dispersing effect taking are ensured.

The present invention concerns a water-based drilling mud for utilization in the drilling of oil wells comprising an aqueous phase wherein the aqueous phase contains an oil soluble polymer in the form of a gel as fluid loss reducer. The subject invention further reveals a process for preparing an oil soluble polymer fluid loss control agent comprising the steps of dissolving at least one polymer in a hydrocarbon oil to form a clear solution or a gel, adding an emulsifier to the solution or the gel, and keeping the mixture under conditions of agitation until a clear creamy mixture is obtained.

The invention discloses crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and a preparation method. The crack self-remediation regenerated concrete comprises components, namely, expanded perlite carried with urease production microorganisms, cement, stone, sand, silica fume, water, urea, calcium chloride, a urease production microorganism suspension and a water reducing agent. The urease production microorganisms are adopted as a concrete crack remediation agent, urease can be generated through metabolism through the urease production microorganisms, and the urea can be decomposed into NH4<+> and CO3<2+>, and furthermore the calcium carbonate can be mineralized and deposited to remedy cracks. In the preparation process, a part of the crack remediation agent is directly mixed with the concrete, then cracks and holes in regenerated crude aggregate self and weak adhesion areas between regenerated aggregate and a new cement stone base can be remedied, and thus the mechanical property of the regenerated concrete can be improved; meanwhile, the other part of the crack remediation agent is firstly adsorbed into an expanded perlite carrier and is further mixed into the concrete, then the crack self-remediation property of the regenerated concrete in the service period can be improved, and thus the anti-penetrability performance and the durability of the regenerated concrete can be improved.

The invention relates to a gypsum-cement binding material and a production method thereof. The material contains gypsum binding material, active admixture, alkaline excitant, oagulation accelerator, lime, water-reducing agent, early-strength agent and gypsum hemihydrate. The weight proportions of the components are as follows: 40%-80% of gypsum binding material, 10%-45% of active admixture, 4%-15% of alkaline excitant, 0-6% of coagulation accelerator, 0-1% of early-strength agent, 0-1% of water-reducing agent, 0-5% of lime and 0-10% of gypsum hemihydrate. The production method comprises the following steps: weighing raw materials at the given ratio, mixing all raw materials, and packaging. The inventive gypsum-cement material has high strength, good water resistance and good volume stability; and can be used as masonry cement, cement mortar, gypsum plaster, jointing gypsum and heat-insulating mortar.

The invention discloses a bi-component cement based composite material for 3D (three dimensional) printing as well as a preparation method and application thereof. The bi-component cement based composite material for 3D printing comprises a component A and a component B, wherein the component A is prepared from 34 to 40 percent of sulphate aluminium cement, 0 to 6 percent of inorganic powder, 40 to 44 percent of tailing machine-made sand, 2.5 to 3 percent of high-molecular polymer and the balance of a retarder, a water reducer, a size stabilizer, a defoaming agent and water, the pumping performance can be well kept for a long time, an industrialized process of pre-stirring production in a mixing plant, transportation, and using in a construction site can be realized; the B component is prepared from a coagulate promoting agent, a thixotropic agent, a defoaming agent and water, the component is stable in form and can be stored for a long time or produced in a concentrated manner. After A and B are respectively pumped in a 3D printer, through high-speed stirring and being mixed by an extrusion head, the composite printing material can be extruded out, the time of coagulation is short, the strength is high, the adhesion is good, the stability is strong, the constructive continuity and building strength requirements of building 3D printing can be met, the industrial production and promotion of the cement based 3D printing material are facilitated, and the application of a 3D printing technology in buildings can be effectively promoted.

The invention discloses permeable recycled aggregate and ceramsite concrete doped with industrial and agricultural solid waste and preparation. The permeable recycled aggregate and ceramsite concrete doped with industrial and agricultural solid waste is characterized in that recycled coarse aggregates and ceramsites are taken as coarse aggregates of concrete, an appropriate amount of pretreated industrial and agricultural solid waste such as industrial waste, agricultural waste, household garbage and the like is taken as an admixture, a cementing agent is prepared from cement, water, a superplasticizer and a reinforcement material, and the materials are mixed with a preset stirring process and preparation method, so that ecological concrete with good mechanical property, permeable property and durability is produced. According to the concrete, the waste utilization rate is up to about 80%, the concrete is environment-friendly, locally available materials can be used, the economic benefit is remarkable, ceramist pore is smaller, and sewage can be continuously and stably treated, so that the concrete is commonly used in water environment comprehensive improvement engineering; and besides, the concrete has light weight, high strength and good water permeability and can be also used in permeable pavement engineering such as a sidewalk, a parking lot and the like as well as plant engineering such as ecological riverway slope protection, roof landscape planting and the like.

The invention relates to a cementitious capillary crystalline waterproof material, which comprises the following components in percentage by weight: 30 to 50 percent of cement, 5 to 10 percent of swelling agent, 8 to 20 percent of quartz sand, 5 to 12 percent of mineral additive, 20 to 35 percent of water reducer, 0.2 to 1.0 percent of retarder, 1 to 15 percent of crystal precipitator, 1 to 12 percent of complexing agent, 1 to 13 percent of calcium ion compensating agent and 0.1 to 1.0 percent of crystal growth promoter. The cementitious capillary crystalline waterproof material has double waterproof property, high cementitious capillary crystallization capacity, capacity of quickly repairing the cracks, and excellent chemical corrosion resistance.

The invention relates to a cement-matrix sound-absorption material used in road noise barriers and a preparation method thereof; the sound-absorption material is a noise barrier material which can be used in airports, high-speed railways, expressways, urban viaducts, subways and light rails; the components and weight ratios are as follows: 15.4 to 62.3 percent of Portland cement, 0.1 to 15.7 percent of mineral admixture, 18.9 to 79.9 percent of lightweight porous aggregate, 0.013 to 0.078 percent of foaming agents, 0.1 to 0.7 percent of water reducing agent and 0.4 to 2.6 percent of fiber. The sound-absorption material and the preparation method thereof have the advantages of large sound absorption coefficient, high strength, good anti-impact performance, excellent durability, fire resistance, moisture resistance, anti-corrosion and self-clean function; at the same time, the sound-absorption material is wide in sources of raw materials, convenient in preparation and processing, suitable for large-scale production, low in cost, environment-friendly and good in decorativeness.

The invention discloses a silane coupling agent modified polycarboxylate superplasticizer and a preparation method thereof, belonging to the field of cement additives. The preparation method comprises the following steps: adding a certain amount of acrylic acid into a polyether macromonomer solution, and stirring uniformly; adding a double bond-containing silane coupling agent; stirring the solution to a clear state and continuously stirring; adding an oxidizing agent, an initiator solution and a small monomer solution while keeping the stirring state; after the stirring, curing for 1-2h; adding liquid caustic soda for neutralization and stabilizing the pH value at 6; and adding a silane coupling agent without double bond to obtain a finished product of silane coupling agent modified polycarboxylate superplasticizer. In the invention, a functional group with a siloxane structure is introduced into the main chain of polycarboxylate molecule, and an anchoring ability in chemical bonding strong interaction with cementing material particles is provided for the branch chain of the comb-shaped polycarboxylate superplasticizer; and with the increase of the anchoring ability, the adaptability and slump loss resistance of the superplasticizer can be remarkably enhanced, and the application of the superplasticizer in the field of mineral micropowder dispersion is expanded to a certain degree.

The invention relates to a mineral polymeric material based active powder concrete and a preparation method thereof. The mineral polymeric material based active powder concrete is made of a gelled material, aggregate, an exciting agent, water, a water reducer and steel fiber in a mass ratio of 1: 0.8-1.3: 0.01-0.2: 0.1-0.3: 0.005-0.07: 0.01-0.25. The preparation method comprises the steps of: pouring the weighed gelled material, aggregate and steel fiber in an agitator and agitating evenly, adding the water in which the exciting agent and the water reducer are dissolved, mixing evenly and molding through vibration or compression, and carrying out autoclave curing or steamed curing on a molded test piece to obtain the mineral polymeric material based active powder concrete. By adopting thepreparation thought of introducing the mineral polymeric material, abundant solid wastes are mixed in the active powder concrete successfully; and the prepared active powder concrete not only has high strength and good durability, but also achieves the effects of reducing the cost and protecting the environment.

The invention relates to a polycarboxylic acid water reducing agent, a preparation method and an application thereof, and belongs to the technical field of concrete additives. The polycarboxylic acid water reducing agent is prepared by using industrializedly produced isobutenol polyether or isoamylenol polyether with relatively good performances as a monomer A, unsaturated carboxylic acid, unsaturated acid anhydride or unsaturated ester as a monomer B and unsaturated sulfonic acid and salts thereof as a monomer C, according to a water reducing agent functional group theory and a polycarboxylic acid water reducing agent molecule design theory; and co-polymerizing the monomer A, B and C. A polycarboxylic acid water reducing agent product is obtained in a water solution via a one-step method, under initiation of a redox initiation system, by introducing carboxyls or ester groups having the functions of delayed coagulation and slump resistance, and the sulfonic acid groups having high water reducing effect into the molecular structure of the water reducing agent and controlling a material ratio and material-feeding modes. Besides, cost can be further reduced by selecting a proper redox system to make the polymerization carried out at a low temperature. The method is suitable for industrialize production.

The invention relates to a kind of pair-slurry affusing material prepared with cement as basic raw material. It is comprised of two kinds of dry powdery mixed materials A and B of affusing slurry pair-liquid formed after adding water. Their weight percents are respectively: mixed material A: sulfur aluminate cement 30% - 98.1%, retarder citric acid 0.1% - 0.5%, flocculant polyacrylamide 0% - 0.8%, water-reducing agent FDN 0.6% - 1.5% and inorganic padding pulverized coal ash 0% - 69.1%; mixed material B: Portland cement 20% - 88%, land plaster 6% - 15%, flocculant UWN 0% - 0.7%, accelerator lithium carbonate 0.4% - 1.0%, water-reducing agent FDN 0.5% - 1.3%, calcareousness 2.0% - 5.0% and inorganic padding pulverized coal ash 0% - 70.8%.

The invention discloses a mud resisting and slump retaining type polycarboxylic acids water reducer and a preparation method thereof. The mud resisting and slump retaining type polycarboxylic acids water reducer comprises, by weight, unsaturated polyoxyethylene ether 32.5% to 33.6%, unsaturated carboxylic acid 1.7% to 2.5%, functional monomer 3.25% to 3.36%, cross-linking agent 0.08% to 0.13%, oxidizing agent 0.12% to 0.32%, reducing agent 0.09% to 0.17%, chain transferring agent 0.03% to 0.06%, alkalinity modifier 0.86% to 1.22%, and water 60%. The water reducer in the invention has quite strong adaptability for sandstone with high silt content, good effect on mud resisting, large initial dispersibility, low cost and good slump retaining performance. Moreover, the preparation method in the invention reacts at normal temperature; has short reaction time, low energy consumption, low cost, high security coefficient, and no need to control the temperature in the whole production process; and is simple, without pollution, and suitable for commercial production.

The invention relates to a preparation method of a slow-setting polycarboxylic acid water reducing agent, which is implemented by carrying out free radical copolymerization reaction on allylsulfonate monomers, acrylic monomers, polyethylene glycol nono-methyl ether methacrylate macromonomers and maleic anhydride grafted beta-cyclodextrin macromonomers. The invention is characterized in that a beta-cyclodextrin side chain is introduced into a polycarboxylic acid main chain, so that the polycarboxylate water reducing agent has favorable slow setting property, micro air-entraining property and better fluidity. The obtained polycarboxylic acid water reducing agent has the advantages of stable product performance, strong adaptability to cement and favorable compatibility; and the cement paste fluidity is up to higher than 290mm (W / C=0.29), the water reducing rate of concrete is up to 30-40%, and the slump protection time is 3-5 hours. The preparation method provided by the invention has the characteristics of unique technique, excellent product performance and the like.

The invention relates to cement-based shrinkage-free wall hole-penetrating blocking materials and a preparation method and a construction method. The materials comprise, by weight, 100 cement, 0-100 active admixture, 0.01-10 water reducing agent, 0.01-10 early strength agent, 0.1-30 expanding agent, 0-20 adhesion agent, 0-10 water repellent, 0.01-30 plastic retaining agent, 0.01-10 starch ether, 0-60 power filler and 0-300 aggregate. Compared with the prior art, the cement-based shrinkage-free wall hole-penetrating blocking materials have the advantages of being good in construction performance, and long in operational time. New mixing slurry has good plasticity, adhesive power and anti-falling performance, a caulking gun or a caulking machine can be used for pressing, injecting or sealing holes, a flowing phenomenon cannot appear even big holes are filled, and the big holes can be filled until the big holes are full and until reaching the deep hole, and completely sealed, and the sealing materials can fully come into play.

The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.

The invention relates to an anti-mud polycarboxylic water reducer and a preparation method thereof and belongs to the field of water reducers. The preparation method of the water reducer comprises the steps of (1) preparing quaternary ammonium salt oligomer: allowing epibromohydrin and tertiary amine compound aqueous solutions to react by the action of a composite initiator in a mixed solvent of low alcohol and water when a system pH (potential of hydrogen) value is 1-2, then performing reduced pressure distillation, and obtaining light yellow viscous quaternary ammonium salt oligomer, and (2) preparing the anti-mud polycarboxylic water reducer, performing radical copolymerization on quaternary ammonium salt oligomer, isopentene alcohol ethoxylate, amino trimethylene phosphonic acid, unsaturated monocarboxylic acid and a derivative of unsaturated monocarboxylic acid by the action of an initiator and a chain transfer agent to form the colorless to light yellow transparent polycarboxylic water reducer. An adverse effect of a mud content of aggregate in concrete on the polycarboxylic water reducer can be avoided, and the problems of insufficient water reduction, great slump loss and lower strength of the concrete are solved on the premise that the mixing amount of the polycarboxylic water reducer is not increased.

The invention provides a cement-based ultra-high strength contraction-free grouting concrete which is composed of cement, quartz sand, water reducer, swelling agent, defoamer, anti-settling agent, steel fiber, retarder and water-retaining agent in parts by weight: 100 parts of cement, 5-10 parts of swelling agent, 50-100 parts of quartz sand, 0.5-2.5 parts of water reducer, 0.3-1.0 part of defoamer, 0.1-0.3 part of anti-settling agent, 5-30 parts of steel fiber, 0-1.0 part of retarder and 0.1-0.3 part of water-retaining agent. The invention has the following beneficial effects: (1) at the normal temperature, the 1d compression strength of the cement-based grouting concrete is improved to be above 70 MPa; (2) at the normal temperature, the 28d compression strength of the cement-based grouting concrete is improved to be above 120 MPa; and (3) the cement-based ultra-high strength contraction-free grouting concrete can be used for installing large, ultra-large equipment basis, and can be used for occasions, such as bolt anchoring, structure fastening, road repair and the like which have high requirements on the compression strength of grouting concrete.

The invention relates to radiation shield concrete and a preparation method thereof. The radiation shield concrete is characterized by comprising a cementing material, coarse aggregates, fine aggregates, steel fibre, a high-efficiency slushing agent and water; the cementing material is composed of ordinary portland cement and inorganic mineral admixtures; the inorganic mineral admixtures are siliceous dust and coal ash; the fine aggregates are natural sand, boron glass powder and steel slag powder; the coarse aggregates are steel sections or a mixture of the steel sections and steel slag; the proportions of various types of components are as follows: 500 kg / m<3> of cementing material, 1400-2215 kg / m<3> of coarse aggregates, 750-950 kg / m<3> of fine aggregates, and 155-200 kg / m<3> of water; the high-efficiency slushing agent is 0.5-1.0% of the total weight of the cementing material by weight; and the steel fibre is 1.0-1.5% of the total volume of the concrete by volume. The radiation shield concrete has good mechanical property and lasting quality, good shielding effect on gamma rays, good effect on shielding neutron rays, can be used or comprehensively recycling wastes and has low cost.