48results about How to "Delayed initial setting time" patented technology

A gypsum composition containing a sulfonate-containing comb-branched copolymer is disclosed. The sulfonate-containing comb-branched copolymer comprises recurring units of a polyether macromonomer, an acrylic monomer, and a sulfonate monomer. The sulfonate-containing comb-branched copolymer not only increases the fluidity of gypsum slurry but also has reduced retardation on the gypsum setting.

Novel hydraulic cements are disclosed that include reactive magnesium oxide prepared by low temperature calcination. The cements can be formulated to suit a large number of applications with various setting times, strength and levels of sustainability either by adding iron salts such as ferrous sulfate or blending with other compatible faster setting hydraulic cements such as Portland cement or by using both methods. The compositions are able to incorporate relatively large amounts of low cost pozzolans such as fly ash to advantage as well as wastes. Many excellent properties are exhibited and in particular good comprehensive strength and resistance to sulfates is able to be achieved.

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.

A quickly-solidified tile adhesive comprises the raw materials in parts by weight: 20-40 parts of quick-hardening cement, 40-50 parts of quartz sand, 10-20 parts of fly ash, 10-20 parts of calcium carbonate, 2-4 parts of redispersible latex powder, 0.2-0.5 part of cellulose ether, 0.1-0.3 part of starch ether, 0.2-0.5 part of water repellent, 0.1-0.4 part of retarder and 1-5 parts of early strength agent. The quick-hardening cement, the quartz sand and the fly ash are used as raw materials to prepare the quickly-solidified tile adhesive, the adhesive is short and adjustable in initial setting time, the strength growth is fast, the fixed waste fly ash generated by thermal power plants is effectively utilized, the adhesive also contains organic high-molecular polymer capable of being compounded with the ceramic tile and the indoor environment pollution cannot be caused.

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.

The invention relates to a wide spectrum chlorine-free coagulation accelerating early strength agent for oil field oil well cement. The early strength agent comprises the following raw materials in parts by weight: 1 to 1.5 parts of sodium salts, 1 to 1.5 parts of calcium salts, 1 to 1.5 parts of aluminum salts, and 1 to 1.5 parts of other materials, wherein other materials are one or more of hydroxyl apatite, meta-kaolin, magnesium trisilicate, magnesium oxide, strontium sulfate, strontium carbonate, strontium nitrate, lithium carbonate, and oxalic acid. The provided early strength agent is stable, and has an excellent coagulation accelerating performance and early strength property; the early strength is high, the strength development is fast, the thickening transition time and primary-final setting transition time are short; and the early strength agent is suitable for various cement slurry systems such as cement slurry system with a wide temperature range and large temperature difference, AMPS cement slurry system, and the like.

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.

The invention discloses a pretressed concrete pile which is casted by pumped high-strength concrete. The pumped high-strength concrete comprises the following ingredients: cement, fine aggregate, coarse aggregate, water, mineral active material, and additive; the additive comprises water reducing agent and retarding admixture; the volume weight of the concrete is 2420 kilograms per cubic meter to 2550 kilograms per cubic meter; in each cubic meter of the concrete, the dosage of the cement is 440 kilograms to 490 kilograms, the dosage of the fine aggregate is 530 kilograms to 560 kilograms, the dosage of the coarse aggregate is 1210 kilograms to 1230 kilograms, the dosage of water is 140 kilograms to 160 kilograms, the mixing amount of the mineral active material is 16% to 18% of the dosage of the cement, the mixing amount of the water reducing agent is 1.8% to 2% of the dosage of the cement, and the mixing amount of the retarding admixture is 0.15% of the dosage of the cement. The invention further discloses a production method of the prestressed concrete pile. The prestressed concrete pile has high strength and good durability.

The invention relates to a reactive powder concrete delayed coagulation adjustable constant feeding control method and a device, which mainly solve the technical problems that the reactive powder concrete discharging speed is quick, a reactive powder concrete hopper port is blocked, and the like. The technical scheme point is that the device comprises a feed trough (110), an anti-condensation stirring device (111), an adjustable speed spiral discharging machine (112) and a directional chute (113); the adjustable speed spiral discharging machine (112) is arranged on the outer side of the feed trough (110); discharge holes formed on the lower end of the feed trough (110) are connected with feeding holes formed on the lower part of the adjustable speed spiral discharging machine (112); the lower part of the anti-condensation stirring device (111) stretches into an inner cavity of the feed trough (110); the adjustable speed spiral discharging machine (112) is connected with the directional chute (113) in a matching way. According to the reactive powder concrete delayed coagulation adjustable constant feeding control device provided by the invention, the anti-condensation stirring device with the structure is adopted to stir materials in a hopper, so that a discharge hole of the hopper can be prevented from being blocked, and constant regulation can be realized. The device is mainly used for reactive powder concrete production construction.

A preparation method of high-performance composite gypsum cementing slurry belongs to the technical field of building materials. The composite gypsum cementing slurry comprises the components of one of building gypsum powder, coal ash or slag powder, a mixed powder comprising cementing, a water reducer and water as well as the components of an exciting agent formed by mixing a retarder and a sulphate, wherein the water, the water reducer and the exciting agent are proportionally weighed out according to the total mass of the mixed powder, and then poured into a stirring container, and uniformly stirred to obtain a mixed solution, the mixed powder are blended into the stirring container filled with the mixed solution in a stirring state, the mixed powder and the mixed solution are stirred into a slurry at a high speed after being blended so as to obtain the composite gypsum cementing slurry. The composite gypsum cementing slurry has the advantages of excellent pouring performance, adjustable settling time and high compressive strength. The preparation method can be used for producing building material products with different sizes and performances.

The invention relates to the technical field of pipeline construction, and provides an existing road underground drainage pipeline additionally installing method. The existing road underground drainage pipeline additionally installing method aims to solve the problem of affecting traffic when an underground drainage pipeline is installed. According to the technical scheme, an underground drainagepipeline comprises a plurality of pipeline units; and the existing road underground drainage pipeline additionally installing method includes the following steps that S1, a construction well is excavated; S2, a construction channel is excavated; S3, an underground construction chamber is excavated and supported; S4, straight holes are drilled and excavated; S5, the straight holes are subjected topretreatment; S6, the underground drainage pipelines are laid, specifically, a plurality of pipeline units are sequentially ejected into the straight holes, and the lubricated cement slurry is sprayedbefore the pipe units are ejected; and S7, grouting is performed, specifically, the lubricated cement slurry is injected to fill the gaps between the underground drainage pipes and the straight holes. By excavating the construction well on one side of a road and excavating the underground construction chamber below the road, the working space is enabled to be an underground space, the whole construction process is completed underground, road excavation is avoided, and the influence on traffic is reduced.

The invention provides a fluorgypsum-based plastering material as well as a preparation method and application thereof. The fluorgypsum-based plastering material is prepared from fluorgypsum, an admixture, aggregate, an expansion inhibitor, an excitant, a water retention thickener and an acid-base regulator. The preparation method comprises the following steps: crushing fluorgypsum to obtain fluorgypsum particles; and mixing the fluorgypsum particles with the admixture, the aggregate, the expansion inhibitor, the excitant, the water retention thickener and the acid-base regulator to obtain thefluorgypsum-based plastering material. The fluorgypsum-based plastering material has the characteristics of short setting time, high strength, small stacking density, good volume stability, high bonding strength, excellent water-retaining property and the like; the preparation method is simple, and the fluorgypsum-based plastering material has a wide application prospect in the field of preparation of building materials.

The invention provides a water-soluble setting accelerator, which is prepared from the following production raw materials in parts by mass: 174 to 212 parts of sodium hydroxide, 226 to 188 parts of aluminum hydroxide, 1 to 8 parts of potassium sulphate and 1 to 8 parts of sodium carbonate. According to a preparation method, firstly, 100 parts of water is contained in a reaction kettle; the sodiumhydroxide is added; heating and stirring dissolution are performed; then, the aluminum hydroxide is added; the continuous stirring and heating are performed to 100 DEG C to 130 DEG C; after the aluminum hydroxide is completely dissolved; the potassium sulphate and the sodium carbonate are added; the stirring is continuously performed; after the complete dissolution, the materials are pumped into aspraying tower by a pump; drying dewatering is performed; the water-soluble setting accelerator is obtained. The water-soluble setting accelerator has the beneficial effects that the materials are solids in the transportation process; the transportation cost is low; the transportation cost is reduced; the defects of easy leakage, too high packaging cost and great storage occupied area in the liquid setting accelerator transportation process are overcome; the preparation process is simple; the production cost is low; no pollution is caused.

The invention discloses an early strength polycarboxylic acid type water reducer, as well as a preparation method and application thereof. The water reducer is composed of the following raw materials in parts by weight: 25-35 parts of acrylic acid, 7-15 parts of lygodium japonicum, 12-20 parts of polymine and 1-5 parts of polysorbate. The method comprises the following steps: mixing and thermally stirring lygodium japonicum and polymine solution; adding polysorbate and thermally treating; adding acrylic acid and ultrasonically treating; centrifugally treating and taking filter liquor; and thermally stirring and treating, thereby acquiring the water reducer. The early strength polycarboxylic acid type water reducer has the advantages that the early strength effect is excellent, the cost is lowered, and the performance is stable; under the synergistic effects of all the raw materials, the water reduction efficiency of the early strength type water reducer is greatly increased; the flowing property of the net paste is excellent; the bleeding rate and the air content are reduced; the air content is greatly reduced and the initial setting time and final setting time of the concrete are greatly shortened; the durability is increased; and the early strength polycarboxylic acid type water reducer is suitable for low temperature, can be used at -10 DEG C and can be used for effectively solving the problem of slow development of concrete strength under the low temperature condition.

The invention belongs to the technical field of cement materials, and particularly relates to solid-waste-based super-retarded cement as well as a preparation method and application thereof. The cement comprises the following components in parts by weight: 60-68 parts of clinker, 10-14 parts of fly ash, 8-10 parts of slag powder, 2-4 parts of dihydrate gypsum, 3-4 parts of phosphogypsum, 2-4 parts of desulfurized gypsum and 4-8 parts of superfine slag powder. A certain mass ratio of sugar residue is added in the production of the clinker to improve the SO3 content of the cement clinker, the characteristics of different solid waste materials are deeply combined, industrial waste residues such as non-ferrous metal slag, sludge residue and polluted soil are cooperatively used, a large amount of solid waste materials are consumed, and the characteristics of different materials are cooperated to prepare the cement clinker with the characteristics of obviously prolonged retarding time and high stability. The solid waste-based super-retarded cement for the road base is low in production cost, simple in process and applicable to a three-layer continuous paving process of a water-stable base. The strength of the obtained cement is high, the strength grade of 42. 5 cement for the road base is met, the initial setting time is longer than 440 min, and the final setting time is longer than 590 min.

The invention relates to a super-early-strength polycarboxylate-type water reducing agent. The super-early-strength polycarboxylate-type water reducing agent is prepared from the following raw material components: unsaturated polyoxyethylene polyoxypropylene block amine ether, polyethylene glycol monomethyl ether ester, unsaturated monocarboxylic acid, amino unsaturated acid ester, acrylamide monomers, an alkali metal hydroxide solution, a thiocyanate early strength agent, an oxidizing agent, a reducing agent, a chain transfer agent and water. Wherein the polyethylene glycol monomethyl ether ester is an esterification product obtained by reacting polyethylene glycol monomethyl ether with unsaturated monocarboxylic acid under an acidic condition; wherein the amino unsaturated acid ester is an esterification product of unsaturated monocarboxylic acid and N, N-dialkylethanolamine. The invention further relates to a preparation method and application of the super-early-strength polycarboxylate-type water reducing agent. The super-early-strength polycarboxylate-type water reducing agent promotes hydration of cement, does not contain any active reinforcing admixture, and has remarkable economic benefits, social benefits and environmental benefits; and the preparation process is simple and convenient to operate.