44 results about "Cement accelerator" patented technology

The invention discloses a CA slurry dried-powder of board-typed non-slag rail, which comprises the following parts: cement, AEA swelling agent, coal ash, cement accelerator, aluminium powder, defoamer, high-effective dehydragent, redispensable emulsion powder, fine sand, AE air-entrainer, ligno-cellulose and cellulose ether. The CA slurry dried-powder adopts industrial manufacturing to produce the product with stable quality, high fluidity and compactness, which is fit for high-speed railroad.

The invention discloses a shotcrete admixture, comprising: 13 to 15 parts by weight of cold water quick dissolving powdery methylcellulose ether or cold water quick dissolving powdery hydroxyethyl cellulose ether, 13 to 15 parts by weight of cold water quick dissolving powdery polyvinyl alcohol, 8 to 11 parts by weight of naphthalene-series powdery water-reducing agent, 1 to 2 parts by weight of mesh polypropylene fiber and 58 to 62 parts by weight of cement accelerator. The shotcrete admixture is prepared by adding the constituents into the concrete together for increasing the cohesion of concrete and viscosity of early-stage slurry, the slurry initial setting time is short, and the resilience amount of concrete can be reduced by 30 to 50 percent.

The present disclosure relates to cement compositions comprising: (a) cement, (b) an electric arc furnace dust (EAFD), and (c) a cement accelerator; wherein the electric arc furnace dust is present in an amount from greater than 8 wt % based on the total weight of the cement (a); and it relates to cement compositions comprising: (a) cement, (b) an electric arc furnace dust (EAFD), and (c) a cement accelerator comprising calcium chloride, calcium nitrate, or sodium nitrate, or a combination thereof; wherein the electric arc furnace dust is present in an amount from greater than 8 wt % based on the total weight of the cement (a). Also disclosed are methods for making the disclosed compositions and products using the disclosed compositions. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Liquid, moisture-curing compositions comprise (a) a silane-terminated moisture-curing polymer, and (b) an inorganic adhesion promoter comprising one or more cements, pozzolan, lime, aluminum trihydroxide, one or more cement accelerators, or a mixture thereof. The composition is curable to form an impermeable barrier to liquid water, and the inorganic adhesion promoter is included in an amount effective to improve adhesion of cement mortar to a cured layer of the composition. Methods employ such compositions to form liquid water-impermeable membranes, and a variety of products employ such membranes.

The invention relates to an improved manufacture method of cement accelerator, which comprises the following steps: step I, raw material mix calcination: carrying out mix calcination on 28.8% of bauxite, 40.1% of limestone, 21% of soda ash and 10.1% of raw coal to obtain a aluminum oxygen chamotte; step II, mix grinding: taking calcined aluminum oxygen chamotte and industrial coal cinder to carry out mix grinding to obtain a cement accelerator in the prior art; and step III: adding polyacrylamide and redispersible emulsion powder in proportion in the cement accelerator in the prior art. By adopting the method in the invention, the cement accelerator prepared improves the caking property of the concrete, enables the concrete to have enough moisture for conservation, changes the brittleness of the concrete, and enables the sprayed concrete to have a favorable anti-permeability, meanwhile increases the bond force of the sprayed concrete and the base course, and increases the stretching bonding strength of the base course.

The invention discloses thermal-insulating cement. The thermal-insulating cement comprises the following components by weight percentage: 5-10 parts of vermiculite power, 35-73 parts of cement clinker, 3-5 parts of gypsum, 3-5 parts of slag, 1-8 parts of titanate, 20-45 parts of fluorgypsum, 2-6 parts of a cement accelerator, 6-9 parts of a heat-insulation filling material, 3-6 parts of a thickening agent, and 5-10 parts of bentonite. Compared with common cement, the heat-insulation effect of the thermal-insulating cement is increased by 30%, and the thermal-insulating cement has good heat-insulation effect.

The invention discloses a CA slurry and manufacturing method of board-typed non-slag rail to fill the high-speed railroad subgrade, which comprises the following steps: blending dry powder of CA mortar and CA mortar emulsion and water with weight rate at 100:50-55:4-8 to form the CA mortar; allocating the dry powder of the CA mortar with cement, AEA swelling agent, coal ash, cement accelerator, aluminium powder, defoamer, highly effective dehydragent, dispersible emulsion powder, fine sand, AE air-entrainer, wood cellulose and cellulose ether; making slow-breaking slow hardening cation emulsified tar and composite emulsion of polychloroprene latex as CA mortar emulsion; stirring the prepared material, mortar emulsion and water; adding the dry powder of the mortar to stir; manufacturing the dry powder of CA mortar; adopting industrial manufacturing to produce stable-quality product; making the manufacturing and transportation conveniently.

The invention discloses a cement concrete bridge deck pavement surface vibration reduction sealing layer and a construction method. The material comprises the following components in parts by weight:10-20 parts of emulsified asphalt, 10-20 parts of water-borne epoxy resin emulsion, 10-25 parts of water-borne epoxy resin curing agent emulsion, 100 parts of sand, 3-8 parts of cement, 0.05-0.4 partof cement accelerator, 5-10 parts of waste tire rubber powder and 4-12 parts of water. The construction method sequentially comprises the following steps of designing a construction mix proportion, preparing a solid mixture, a leachate ring mixed solution and a water ring mixed solution, loading and calibrating a slurry seal paver, mixing and paving, trimming, maintaining and opening traffic. Theconstruction thickness of the surface vibration reduction sealing layer is only 3 mm, the maximum particle size of used sand is 3 mm and is the same as the thickness of the surface vibration reductionsealing layer, and therefore tracks cannot be generated. And meanwhile, the surface vibration reduction sealing layer can reduce the driving noise of cement concrete bridge deck pavement, improve thedriving comfort and reduce the impact force of the vehicle load on the bridge, namely, the vibration reduction effect is achieved.

The invention relates to a function modified cement accelerator. The function modified cement accelerator is characterized in that ordinary Portland cement is endowed with a special function through modification. As for the traditional accelerator, once the traditional accelerator is added into and stirred with the ordinary Portland cement and water, calcium sulphoaluminate is generated and hydrated to release heat, thereby causing workability loss of cement and thus being only suitable for a jetting process; the setting time of the cement cannot be flexibly preset; and the cement curing is only mechanically accelerated, so that the traditional accelerator is unsuitable for various projects and technologies. Different from the traditional accelerator, the function modified cement accelerator has main characteristics that the function modified cement accelerator can be poured, jetted and injected for molding at the aspect of use technology, the setting time can be roughly preset and the workability and liquidity thereof are almost not influenced before the preset setting time; an additive is used for solving the problem of partial functional application of the ordinary Portland cement; the function modified cement accelerator has a wide application prospect in the fields of metro grouting, cement technical components, quick pavement patching, 3D printing of building walls, and the like, in the future.

The invention provides a polymer low-alkaline accelerator used for sprayed concrete. The polymer low-alkaline accelerator used for sprayed concrete comprises the following components in percentages byweight: 20% to 30% of aluminate, 10% to 20% of phosphotungstate, 5% to 10% of a low molecular weight polymer, 5% to 10% of a high molecular weight polymer and 30% to 50% of water. Moreover, the invention also provides a preparation method of the polymer low-alkaline accelerator used for sprayed concrete. The possibility of generating an alkali-aggregate reaction is greatly reduced, the problem that the long-term strength and durability of concrete are reduced caused by the fact that the alkali-aggregate reaction occurs easily due to high alkali content in an existing cement accelerator is solved, simultaneously, the problems of large dust and great resilience in the injection process are solved through granular composition of the low molecular weight polymer and the high molecular weightpolymer, moreover, the sprayed concrete is used in a wet spraying technology, the stable period exceeds six months, different varieties of ordinary Portland cement can be initially set within three minutes under relatively low amount of admixture and finally set within ten minutes, the 1d strength of cement mortar reaches more than 7 MPa, and the 28d ratio of compressive strength is greater than 85%.

The invention discloses a cement accelerator and belongs to the field of buildings. According to the cement accelerator disclosed by the invention, a substance with a cement accelerating effect is prepared by taking aluminum sulfate octadecahydrate and calcium oxide as raw materials and carrying out high-speed shearing; lithium slag is used as a raw material, is subjected to microwave treatment and is enabled to have more free lithium salts and the like, so that condensation of cement concrete can be promoted and the initial set time is shortened; in addition, alumina and calcium sulfate in the lithium slag also react to generate calcium sulphoaluminate hydrate, so that early strength can be improved; bamboo fibers are added for compounding and raw bamboo fibers are doped, so that the volume shrinkage stress is digested, and further cracks are reduced; the breaking strength of cement-based mortar is improved along with the increase of the doping amount of the raw bamboo fibers; the anti-cracking and compressive strength of the cement slurry at later stage is improved, and further the quality of cement is improved.

The invention discloses a Bayer red mud cement accelerator, which comprises the following raw material by weight ratio, the ratio of Bayer red mud sintering clinker: naphthalene sulfonic acid formaldehyde condensation polymer (FDN): triethanolamine (TEA): Bayer red mud: fly ash: additive is 47-55% to 6-12% to 0.5-1.2% to 15-20% to 10-15% to 5-15%, and an additive is semi-hydrated gypsum and/or lime. The accelerator is prepared according to the following method, drying the Bayer red mud to prepare the Bayer red mud sintering clinker, weighting the components of each raw material according to weight, mixing the weighted raw materials, crushing and grinding, and sieving by a sieve with 200 meshes and packaging to prepare the Bayer red mud cement accelerator. According to the invention, the coagulation time can accord with a national building material current standard, and reduce the production cost of the cement accelerator, compared with a test piece 28d compressive strength with the Bayer red mud cement accelerator, the time intensity of the test piece 28d compressive strength without the Bayer red mud cement accelerator is increased by more than 85%, and the invention provides a feasible approach for comprehensive utilization of the Bayer red mud in an alumina industry.

The invention provides a rubber particle weight increasing method and a preparation method of a rubber concrete. Through the rubber particle weight increasing method, the weight and the density of a rubber particle are increased, the rubber particles are more evenly distributed in the concrete, and the mechanical property of the rubber concrete is improved. The related rubber particle weight increasing method is characterized by comprising the following steps: 1, weighing a certain amount of the rubber particles, soaking with clear water until the particles completely sink down and no bubble exists on the surfaces of the particles; 2, taking out the rubber particles, adding the rubber particles into a cement paste and stirring, wherein the volume ratio of the rubber particles to the cement paste is 1:1 and 20% of a cement accelerator is doped in the cement paste; 3, observing the thickness of a mixture, adding proper amount of water until the slump constant of the mixture is 6-10, stirring for a certain period of time; 4, evenly spreading the mixture by using a shovel blade, basically separating the particles, and airing naturally; 5, screening an excessive powder by using a mesh sieve, maintaining in water for a plurality of days, and taking out; 6, stirring the rubber once every few hours, stirring for times, airing until the particles are grey white, and obtaining the weight increased rubber particles.

The invention provides a cement setting accelerator, and a preparation method and application thereof, and belongs to the field of well cementation in thickened oil exploitation. The cement setting accelerator provided by the invention comprises the following components in percentage by mass: 5-10% of polyaluminium chloride, 20-25% of calcium chloride, 15-20% of sodium oxalate, 5-10% of calcium aluminate, 5-10% of calcium formate, 10-15% of sodium sulfate, 5-10% of a dispersing agent and 10-15% of nano silicon. The cement accelerator provided by the invention is prepared by adopting specific components and content, so that setting is fast at low temperature, early strength is high, and the early strength is not reduced at high temperature. The result of the embodiment shows that when the adding amount of the cement accelerator provided by the invention is 2%, the thickening time of cement paste is 56-137 minutes in a temperature range of 32-52 DEG C; the early strength of set cement after 8 hours is 8.1 MPa at a temperature of 36 DEG C; and the early strength after 24 hours is 26.9 MPa.

The invention discloses multipurpose quick-effective hydraulic glue, which comprises the following parts: 45-60% synthesized emulsion, 0.1-0.2% inorganic dispersant, 0.1-2% organic dispersant, 0.1-0.3% defoamer, 30-40% common silicate cement, 5-15% heavy calcium carbonate and 0.1-1% cement accelerator. The invention possesses high exending strength and high wet-base binding strength, which displays elastic water-proof coating with relative fracture extending property.

The invention discloses a method for recycling an aluminum alloy casting aluminum residue. The method comprises the steps of adopting the aluminum residue produced in an aluminum alloy casting processas a raw material, winnowing, sintering at high temperature, collecting dust at high temperature, collecting dust at low temperature, and obtaining a cement accelerator product and a refining agent product for aluminum ingot casting. The invention provides the effective method for effectively and comprehensively recycling the aluminum residue, meanwhile, the cement accelerator product and the refining agent product for aluminum ingot casting can be prepared, hazardous wastes can be recycled harmlessly, the obtained product can be applied to actual production, and the method provided by the invention is simple, easy to operate, green, environmental-friendly, and wide in application prospect.

The invention relates to the field of cement accelerators, in particular to improved cement accelerator production and processing equipment and a process thereof. The technical problems that a large number of bubbles are generated in the stirring process due to the fact that epoxy resin glue has certain viscosity, the purity of a mixture is reduced, and the product quality is greatly reduced are solved. According to the technical scheme, the improved cement accelerator producing and processing equipment comprises a second supporting frame, a bubble removing assembly and the like; a bubble removing assembly is installed on the upper portion of the front side of the second supporting frame. During use, bubbles dispersed in a mixture are automatically gathered towards the middle, then the mixture containing the bubbles in the middle is heated in an isolated mode, full heating of all the mixture is not needed, energy waste is reduced, energy conservation and environmental protection are facilitated, the mixture is stirred while heating is conducted, meanwhile, a cavity in the upper portion of the first cylinder is pumped to be in a negative pressure state, and the stirring efficiency is improved. The bubble eliminating efficiency is greatly improved, and meanwhile, a mixture remaining in the stirring blades is automatically removed and collected.

The present disclosure relates to cement compositions comprising: (a) cement, (b) an electric arc furnace dust (EAFD), and (c) a non-chloride cement accelerator; wherein the electric arc furnace dust is present in an amount from greater than 0 wt % to 8 wt % based on the total weight of the cement (a). Also disclosed are methods for making the disclosed compositions and products using the disclosed compositions. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

The invention discloses a three-dimensional reinforced cement light wallboard with light weight, great strength, good heat insulation and good sound insulation. The wallboard comprises a polyphenyl board, a sizing agent layer and an alkali-resistant fiber grid, wherein the sizing agent layer is prepared from the following raw material components in part by weight: sawdust, rapid hardening sulphatealuminium cement, fly ash, river sand, reinforcing agent, water and cement softening agent, wherein the reinforcing agent consists of the following raw material components in part by weight: polypropylene fine fiber, sulphoaluminate cement accelerator and silica fume. The three-dimensional reinforced cement light wallboard has the advantages of reducing the dead weight of buildings, increasing the effective use area of the buildings, reducing the structural engineering cost for the buildings, protecting farmland, protecting finite land resources, realizing the factory production of walls, fully and reasonably utilizing industrial and agricultural waste and achieving the aims of protecting earth resources and preventing waste from polluting living environment.

The invention discloses thermal insulating cement which is characterized by comprising the following raw materials in parts by weight: 80 parts of cement clinker, 5-8 parts of gypsum, 10 parts of manganese slag, 5 parts of cement accelerator, 20 parts of vermiculite powder, 3-5 parts of pulverized fuel ash, 0.3-0.4 parts of alum and 12-16 parts of fluorgypsum. The cement is prepared by grinding 80parts of cement clinker, 5-8 parts of gypsum, 10 parts of manganese slag, 5 parts of cement accelerator, 20 parts of vermiculite powder, 3-5 parts of pulverized fuel ash, 0.3-0.4 parts of alum and 12-16 parts of fluorgypsum. A thermal insulating effect of the thermal insulating cement is increased by 40% as compared with the ordinary cement, and the thermal insulating cement has a good thermal insulating effect.

The invention discloses a cement accelerator, and a preparation method thereof. The cement accelerator is prepared from, by weight, 50 to 100 parts of bauxite slag, 20 to 40 parts of sodium carbonate,10 to 30 parts of bentonite, 5 to 15 parts of sulfonated lignin, 5 to 10 parts of a phosphate, 3 to 5 parts of ether sulfate triethanolamine, 1 to 3 parts of Sodium Lauryl Diphenyl Ether Disulfonate,1 to 3 parts of a methylnaphthalene sulfonic formaldehyde polycondensate, 0.5 to 2 parts of N-acyl potassium glutamate, and 1 to 3 parts of Lauryl methyl aminoethyl sodium phosphate. When the cementaccelerator is mixed with cement, hydration reaction is realized as soon as the cement is mixed with water, cement mortar rapid hardening coagulation is realized, concrete and cement solidification speeds are accelerated greatly; the compatibility of the cement accelerator with cement mortar is excellent, and cement concrete intensity is not reduced.