43results about How to "Improve plastic retention" patented technology

The invention discloses a high-strength micro-expansion prestress anchoring grouting material and a preparation method thereof. The material is prepared from a gelatinization component, a fine aggregate component, an expansion component, an active doped material, a water reducing component, a crack resistant component and a regulation component in a certain weight proportion. The preparation method specifically comprises the following steps: A, adding the gelatinization component, the expansion component, the active doped material, the crack resistant component and the water reducing component in a ball-mill in a designed mass ratio for commonly mixing and grinding, so as to obtain a even powder material; B, at room temperature and normal pressure, grinding until the Blaine specific surface of the material is not less than 350m<2>/kg; and C, evenly mixing and stirring the obtained in the step B with quartz sand prepared in a proportion at the room temperature and the normal pressure so as to obtain the grouting material. The method is practicable and is convenient for operation; the grouting material has high early strength and micro-expansion, thereby effectively compensating the hydration shrinkage of a cement-based material, obviously improving the adhesive strength of an anchor rod and a periphery base, effectively protecting the anchor rod from being corroded and prolonging the service of the anchor rod.

The invention relates to a pre-mixed and water-permeable concrete admixture and water-permeable concrete. The pre-mixed and water-permeable concrete admixture is formed by mixing of the following components in percentage by weight: 10-20% of a water reducing component, 1-5% of a hydration regulating and controlling component, 0.1-1.0% of a viscosity regulating component, 0.5-5% of a water evaporation inhibiting component, 0.5-3% of a thixotropic agent component, and the balance of water. The pre-mixed and water-permeable concrete admixture provided in the invention can effectively improve work conditions of the water-permeable concrete, greatly improve the cohesiveness and the uniformity of slurry wrapping aggregate surfaces, and can effectively prolong the operable time of the water-permeable concrete, meet the requirements of pre-mixing production, long-distance transportation and long-time construction of the water-permeable concrete, and improve the control of production and construction quality of the water-permeable concrete.

This invention relates to the field of concrete complex super-retarding water reducers. The super-retarding water reducer in this invention has a mass-fraction composition as follows: 0.5~25% ethylene polyamine alkyl phosphonic acid or its salt, 0.5~20% phosphonobutane tricarboxylic acid, 20~50% water reducers, 0~ 0.5% sodium dodecyl sulphates and water as the rest. There are two preparation methods in this invention, one is that, components mentioned above are directly mixed with water reducers at those mass fractions so as to form super-retarding water reducers; the other is that, super-retarding components are added during water reducer preparation. The super-retarding water reducers in this invention are compatible with different kinds of water reducers. They perform extraordinary retarding activities without any side effect.

The invention relates to a preparation method of a naphthalene-series water reducing agent. The method comprises the following steps: (1) methylnaphthalene and phenol are separately sulfonated, such that a sulfonated methylnaphthalene material and a p-hydroxybenzenesulfonic acid material are obtained; (2) the sulfonated methylnaphthalene material is subjected to a hydrolysis reaction; un-reacted methylnaphthalene or homologs thereof are removed through zeotropy; the rest of the sulfonated methylnaphthalene material enters a reaction in the step (3); (3) the sulfonated methylnaphthalene material obtained in the step (2) and the p-hydroxybenzenesulfonic acid material obtained in the step (1) are subjected to a condensation reaction with formaldehyde acidified with concentrated sulfuric acid, such that a condensed material is obtained; and (4) alkali liquid is added into the condensed material obtained in the step (3), such that a neutralization reaction is carried out, until the pH value is 7.5-9; and the naphthalene-series water reducing agent is obtained when the reaction is finished. The naphthalene-series water reducing agent provided by the invention has the excellent performances of good adaptability to cement, good concrete workability, high plasticity-maintaining performance, low concrete gradual loss, high water reducing rate, and the like. The preparation method has the advantages of simple process and easy-to-control reaction conditions. With the method, naphthalene-series water reducing agent production cost can be reduced.

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.

A preparation method of a super-sustained release ester-ether crosslinking polycarboxylic acid water reducer is provided. The method which combines synthesis of an ester water reducer and synthesis of an ether water reducer allows the polycarboxylic acid water reducer synthesized from large monomers containing different chain lengths and simultaneously containing long side chains and short side chains to be researched and developed, and the method which can guarantee good dispersity and good fluidity keeping ability brings conveniences for the concrete construction process. In the esterification reaction process, hydroxyethyl methacrylate is introduced to increase active hydroxy side chains, and the activity of methacrylic acid is effectively controlled, so the esterification rate of a reaction system is high, product performances are high, and the synthetic method of optimized ester polycarboxylic acid water reducer intermediates is researched and developed through utilizing above principles. A certain synergistic effect is reached by introducing high activity ester monomers in the copolymerization process and combining the long side chains and the short side chains of produced polycarboxylic acid, so performances of the ester-ether crosslinking polycarboxylic acid water reducer of the invention are better than the performances of common ester and ether polycarboxylic acids, and the water reducing rate and the fluidity keeping ability are improved.

The invention provides quick repair mortar for a high-speed railway concrete track slab. The quick repair mortar comprises, by mass, 100 parts of cement, 50 to 250 parts of fine aggregate, 5 to 25 parts of a mineral admixture, 0 to 8 parts of soluble latex powder, 0 to 20 parts of a polymer emulsion, 0.1 to 1.0 part of a water reducing agent, 0.2 to 2.0 parts of an expansion component, 0.1 to 1.5parts of a plasticizer, 0.1 to 1.2 parts of an early strength agent, 0.2 to 1.5 parts of a retarding component, 0.1 to 0.5 part of a defoaming agent and 0 to 30 parts of water. The mass parts of the soluble latex powder and the polymer emulsion are not 0 at the same time. The invention further provides a preparation method of the quick repair mortar and an application of the quick repair mortar innon-structural damage repair of ballastless high-speed railway concrete track slabs. The quick repair mortar has the characteristics of good workability, early strength, high strength, high volume stability, good durability and the like.

The invention discloses low-cost graphene oxide mortar and a preparation method thereof. The graphene oxide mortar is prepared from the following raw materials in parts by mass: 450 parts of cement, 180 parts of water, 1350 parts of natural river sand, 0.9 part of polycarboxylate superplasticizer, and 16.9 parts of graphene oxide solution raw material. The preparation method of the graphene oxidemortar comprises the steps of proportioning the raw materials, mixing the raw materials, pouring, forming and maintaining, and is simple and easy to operate. By adopting the graphene oxide mortar prepared through the invention, through optimizing the coordinate proportion of the raw materials, and adding the graphene oxide solution raw material, the concrete prepared from the graphene oxide mortarmeets the strength requirement, the price is low, and the price of the graphene oxide mortar prepared through the invention is a half of the price of a like product prepared by other technologies.

The invention discloses high-rupture strength graphene oxide mortar and a preparation method thereof. The graphene oxide mortar contains the following raw materials in parts by mass: 450 parts of cement, 180 parts of water, 1350 parts of natural river sand, 0.9 part of a polycarboxylate superplasticizer and 8.5 parts of a graphene oxide solution raw material. The preparation method comprises the steps of raw material proportioning, raw material mixing, pouring, formation, and maintenance. The preparation method is simple and easy in operation. The matching proportion of the raw materials is optimized, and the graphene oxide solution raw material is added, so that the prepared graphene oxide mortar can meet the strength requirement and is low in cost, and the price of the prepared grapheneoxide mortar is 1/2 of the prices of similar products prepared by other techniques.

The invention discloses a preparation method of a high-adaptability polycarboxylate superplasticizer suitable for low-quality aggregate. The high-adaptability polycarboxylate superplasticizer is prepared from an unsaturated polyoxyethylene ether monomer a, an unsaturated carboxylic acid monomer b and an unsaturated phosphate ester monomer c in a molar ratio of 1:(3.0-4.5):(0.5-1.0) under the action of a redox initiator and a chain transfer agent by carrying out an aqueous solution free radical polymerization reaction, wherein the dosages of the oxidant, the reducing agent and the chain transfer agent are respectively 0.4-1.2%, 0.1-0.5% and 0.2-0.8% of the total dosage of the monomer. The preparation method disclosed by the invention has the advantages of simple process, easily controlled conditions, short reaction time, low energy consumption and the like. The prepared high-adaptability polycarboxylate superplasticizer has extremely high adaptability when being applied to gravel aggregate with poor quality, high mud content and machine-made sand concrete, and shows excellent dispersing performance and slump retention capacity.

The invention discloses a fly ash microsphere-doped C70 high-performance graphene oxide concrete and a preparation method thereof. A graphene oxide mortar comprises, by mass, 391.85 parts of cement, 166 parts of water, 570 parts of natural river sands, 1205 parts of broken stones, 69.15 parts of fly ash microspheres, 9.22 parts of a polycarboxylate superplasticizer and 17.288 parts of a graphene oxide solution raw material. A preparation method of the graphene oxide mortar includes the following steps: proportioning of above raw materials, mixing of the raw materials, pouring, forming and curing. The preparation method is simple and is easy to operate. The slump of the C70 high-performance concrete prepared in the invention meets engineering requirements, and the C70 high-performance concrete has an excellent chloride ion penetration resistance. The price of the fly ash microsphere-doped C70 high-performance graphene oxide concrete prepared in the invention is half of that of similar products prepared through other technologies; and the cement consumption of the C70 high-performance graphene oxide concrete is 18% less than that of C70 high-performance concrete prepared through C70high-performance concreted design and having same performances. The reduction of the cement consumption facilitates environment protection.

The invention relates to a manufacturing method of artificial lightweight aggregate or super lightweight aggregate multifunctional concrete and belongs to the technical field of novel concrete materials, environmental engineering and construction. Firstly, a special additive C for preparing the artificial lightweight aggregate or super lightweight aggregate multifunctional concrete is manufactured, a shrinkage restraining additive D is manufactured, after cement, mineral powder, coal ash, microbeads, silica powder, water, glass beads, river sand and other materials are weighed in proportion, the materials are mixed according to the process requirement, and the artificial lightweight aggregate or super lightweight aggregate multifunctional concrete is obtained. According to the method, the multifunctional concrete is manufactured from domestic existing concrete raw materials, industrial residues and other materials, and the product has the functions of self-compaction, self-maintenance, low hydration heat, low shrinkage, high durability and high plasticity retention, and can be applied to constructional engineering, civil engineering, traffic engineering and the like. The manufacturing method has the advantages that construction is convenient, quality is easy to guarantee, management is easy and convenient, and cost is low, energy and resources are saved, and the requirements of environmental protection are met.

The invention relates to a method for utilizing domestic garbage power generation fly ash and slag and waste glass abrasive powder as main raw materials to fire ceramsite. According to the method, heavy metal elements in the ash is cured by high-temperature firing; the heavy metal elements are sprayed on the surface of ceramsite by a hydrophobic emulsion, so that ceramsite holes are sealed, the surface is hydrophobic, and outward diffusion and permeation of residual heavy metal elements are prevented; when the ceramiste is utilized to prepare multifunctional concrete, the ceramsite is furtherwrapped by cement mortar. Detection of an environmental protection department shows that the heavy metal content in the cement mortar can meet a three-level soil quality requirement in GB15618-1995 and meet a HJ/T298-2007 hazardous waste identification technique requirement; heavy metal elements in domestic garbage power generation fly ash and slag become harmless; the multifunctional concrete produced from the ceramsite can be applied to the related fields of construction; the domestic garbage power generation fly ash and slag become useful resources.

The invention belongs to the technical field of concrete additive preparation, and particularly relates to a preparation method for an early-strength agent for concrete. According to the preparation method, cellulose, acetamide and water are first uniformly mixed, sodium hydroxide solution is used for regulating pH, temperature is then kept for reaction, bromooctadecane is then added, mixing and filtration are carried out, filter residue is collected, washed and air-dried, afterwards the air-dried matter is collected to react with tetrahydrofuran, n-butyllithium and dimethylformamide, discharge is carried out, the collected discharged matter and Gamma-aminopropyltriethoxysilane are then uniformly mixed and distilled, finally distilled residue, nano-titanium dioxide and aluminium silicate are mixed, the stirred mixture is collected, and thereby the early-strength agent for concrete is obtained. The early-strength agent obtained by the invention can effectively increase the strength of concrete at each age, and can also effectively shorten concrete hardening time, and in addition, the plasticity-maintaining property is good as well.

The invention discloses a polybasic and multifunctional liquid cement grinding aid and production technology of the polybasic and multifunctional liquid cement grinding aid. The polybasic and multifunctional liquid cement grinding aid and the production technology of the polybasic and multifunctional liquid cement grinding aid are characterized by comprising the following raw materials of tri ethanol amine, polymerization polybasic alcohol and water. The raw materials comprise, by weight percentage, 60 percent of the tri ethanol amine, 20 percent of the polymerization polybasic alcohol and 20 percent of the water. The production technology comprises the following steps. Firstly, weighing is performed based on proportion, and the raw materials are prepared. Secondly, the water is heated to 80 DEG C by a boiler and put in a reaction kettle, the polymerization polybasic alcohol is added, and meanwhile, the reaction kettle is started for stirring for 20 minutes. The tri ethanol amine is then added and stirred for 3 hours and cooling is performed. Thirdly, after the solution is cooled, the solution is transferred into an end product jar, and production is finished. The liquid cement grinding aid is high in comprehensive use performance, plasticity protection performance of cement mixed plastic soil is improved, and the liquid cement grinding aid has good compatibility with a concrete high-efficiency slushing agent. Comprehensive performance of cement is improved, in addition, the production technology is simple, short in production time, and high in production yield.

The invention relates to a method for controlling cracking by carrying out grouting reinforcement on thin-walled structures in a building, which is mainly divided into four parts, i.e., formwork construction, anti-cracking grouting material preparation, grouting material pouring and quality control. Compared with the prior art, under the case of vibration-free construction, the method prevents reinforcing material from cracking to ensure the safety of the structures, the anti-cracking property of the material is greatly increased after components, such as active admixture, fibers and aggregate, are added into the grouting material, moreover, the material cost can be remarkably reduced, adopting controlled permeability formwork liners to maintain construction can remarkably decrease the risk of cracking caused by the dry shrinkage of the grouting material, and furthermore, the appearance quality of reinforcing members also can be remarkably improved.