51results about How to "Improve self-compacting" patented technology

The invention relates to highly-antifreezing highly-slump retaining self-compacting C40 concrete which comprises the following components by kg/m3: 330 parts of cement, 80 parts of granulated blast-furnace slag, 80 parts of fly ash, 830 parts of natural medium sand with a fineness modulus of 2.3-3.0, 920 parts of stone, 4.9 parts of additives, and 160 parts of mixing water; the additive is a modified air-entraining polycarboxylic water reducer, wherein the mixing amount of an air-entraining agent in the polycarboxylic water reducer RP325 is 0.1%, and the mixing amount of the additive for large-scale production is 1.0% of the total amount of gel materials; the air content in the concrete is 5.0%+/-1.0%; the air-entraining amount in the poured structure from the beginning to the third hour is stabilized within a range of 5.0%+/-1.0%, and the concrete expansion degree in 3 hours is maintained at 600+/-50 mm; the number of antifreezing cycle is not less than 150, and the lowest temperature and the highest temperature in the antifreezing cycle are respectively -18 DEG C and 35 DEG C. The concrete of the invention can meet the concrete performance requirements for a skating rink in Shanghai oriental sports center with respect to high slump retaining performance, self-compacting performance, strength performance, high antifreezing performance, and the like.

The invention relates to a polycarboxylate water reducer for ultra-compact concrete for nuclear power and a preparation method of the polycarboxylate water reducer. Every 100 parts of the water reducer comprises components in parts by weight as follows: 50-55 parts of a dispersing ether type polycarboxylate water reducer, 20-25 parts of a slump retaining ether type polycarboxylate water reducer, 3-5 parts of a retarder, 0.01-0.05 parts of a defoaming agent, 1-3 parts of a water retaining agent, 1-2 parts of a shrinkage reducing agent, 0.1-0.3 parts of a preservative and the balance of water. The components are uniformly mixed in parts by weight during preparation. Compared with the prior art, the water reducer has the advantages as follows: concrete workability and liquidity are improved, a temperature peak value and a shrinkage value of the concrete are reduced, the internal porosity of the concrete is reduced, the self-compacting performance and the durability of the concrete are improved and the like; besides, the preparation method is simple, raw material sources are wide, the cost is low, and the water reducer is environment-friendly and has the good application prospect.

The invention provides gypsum-based composite lightweight thermal-insulation mortar. The mortar comprises, by weight, 60-80 parts of gypsum powder, 1-2 parts of polyphenyl granules, 10-15 parts of glazed hollow beads, 5-10 parts of cement, 1-2 parts of redispersible latex powder, 0.2-0.6 part of a water-retaining agent, 0.2-0.6 part of a gypsum retarder, 0.3-0.8 part of a water reducer, 0.2-0.8 part of polypropylene fiber and 60-80 parts of water. The glazed hollow beads and the polyphenyl granules are mixed by selecting a proper grain composition and then combined with semi-hydrated gypsum, apreparation mode is simple, the consumption of a gel material is reduced, the cost is low, the dry density is reduced, the mortar is high in anti-cracking performance, low in shrinkage deformation, high in ductility and good in construction performance, the self-compactness is good, and the heat preservation performance is excellent.

The invention relates to a ladle permanent lining and a manufacturing method of the ladle permanent lining, and belongs to the technical field of ferrous metallurgy ladle lining fireproof material. The ladle permanent lining is laid on the inner wall of a shell (6) of a ladle and sequentially comprises a ladle bottom permanent lining (1), a ladle wall permanent lining (3) and a ladle nozzle permanent lining (10) from bottom to top. The ladle permanent lining is characterized in that the ladle permanent lining is manufactured by minimum-inflation artesian flow castable in a segmented casting mode, an overall casting forming die is not used, and the ladle permanent lining and a bricked working lining are constructed synchronously. The technological process of repairing and laying the ladle lining is simplified, the problem that in the prior art, the bricked working lining leaks steel because the high-aluminum artesian flow castable shrinks in the hardening process is solved, compared with the prior art, the service life of the ladle working lining is prolonged by 150 furnace round-200 furnace round, and the cost of ladle fireproof material is reduced by over 15%.

The invention discloses a construction method of gunite concrete, comprising the following steps: adopting normal pure cement paste consisting of water and cement or mixed cement paste consisting of water and cement mixed with fly ash, which is provided by a high-speed stirring slurrying device; respectively injecting dynamic gravel mixed material of a free falling body or respectively injecting dynamic sand and aggregate of the free falling body via a slurry transmission device; injecting cement paste and dynamic gravel mixed material or dynamic sand and aggregate to cause that the mixture enters a mixed conveyor entrance in an imperfect-mixing state; after stirred into even mixed material, directly sending the mixed material into a cabin via the gravity of the mixed material or sending the mixed material into a cabin via a mixed material sending device for vibrating and pouring into concrete. The invention combines concrete mixing, transporting and pouring technology into a whole, directly pours in site to continuously perform concrete construction, which simplifies concrete construction technology; the invention has few in-site construction devices, convenient operation, quick pouring, low cost and short construction period, effectively strengthens various mechanical indexes of concrete and obviously improves construction efficiency.

The invention discloses a preparation method of nano-silica compacted concrete. The preparation method comprises the following steps: preparing nano-silica of which the surface is coated with nano-alumina into a nano-silica aqueous solution with the concentration of 0.05 to 0.5 mol/L and injecting the nano-silica aqueous solution into an electrolytic cell; putting a concrete specimen with built-insteel bars into the electrolytic cell, connecting the steel bars into a power supply cathode, arranging an auxiliary anode parallel to the concrete specimen outside the concrete specimen and connecting the auxiliary anode into a power supply anode; under the condition of 0 to 4 DEG C, applying 6 to 96 V/cm impressed voltage between the power supply cathode and the power supply anode in the S3 andthen electrifying. According to the method disclosed by the invention, by taking the nano-silica as a raw material and applying an external electric field, the nano-silica enters pores of the concrete through electrophoresis drive; by utilizing C-S-H gel generated through reacting the nano-silica solution with calcium hydroxide, the pores in the concrete are filled to obtain compacted concrete, and further the durability of the concrete is improved.

The invention discloses a pellet type blast hole plugging gun and a use method. The pellet type blast hole plugging gun structurally consists of an air supply handle, a shooting chamber and a storagebin; an air inlet is formed in the lower end of an air storage chamber in the air supply handle; an opening in the left end of the air storage chamber is connected with an air conveying hole channel;an air valve switch is placed at the connecting part of the air storage chamber and the air conveying hole channel; the other end of the air conveying hole channel is connected with the shooting chamber; and a piston rod in the shooting chamber is connected with a piston and an impact disc. During the implementation, a gun muzzle stretches into a blast hole, the air inlet is connected with a high-pressure air pipe, and after a switch is pressed down, the piston makes reciprocating motion under the action of a reverse drawing spring and compressed air to drive the impact disc to impact a charging hopper to discharge a tamping plug, and the stemming tamping plug falls in and rushes into the blast hole at a high speed, so that the purpose of high compactness plugging is achieved. By taking the compressed air as a power source, the pellet type blast hole plugging gun is simple to operate and is safe and portable, and contributes to solving the problem that an existing blast hole is difficult to plug; and compared with manual filling, the construction efficiency is improved substantially.

The invention discloses an underwater dispersion-resistant concrete additive for a building. The underwater dispersion-resistant concrete additive is prepared from the following components in parts byweight: 1 to 2 parts of methylcellulose, 1 to 2 parts of hydroxypropyl methyl starch, 2 to 5 parts of zeolite powder, 10 to 15 parts of stearic acid, 10 to 12 parts of naphthalene-based superplasticizer, 1 to 2 parts of sepiolite fibers, 3 to 5 parts of polyacrylamide, 1 to 3 parts of polyvinyl alcohol, 3 to 5 parts of sodium aluminate, 20 to 22 parts of polycarboxylate superplasticizer, 63 to 73parts of water, and 10 to 12 parts of polyacrylamide. By adopting the underwater dispersion-resistant concrete additive, the cohesiveness, the mobility, the dispersion resistance and the self-compacting performance of the concrete can be comprehensively improved, so that a mixture is not isolated and dispersed, is self-leveled and self-compacted without being vibrated, the water on the original poured surface can be extruded, after the mixture is cured, and the mixture has good adhesion with the surface of the original concrete surface; and the methylcellulose and the polyacrylamide are usedas the anti-scattering agent, so that the concrete has good cohesiveness and water scouring resistance.

The invention discloses a polycarboxylate water reducer composition for self-compaction high-workability concrete. The polycarboxylate water reducer composition is composed of the following components: allyl alcohol polyoxyethylene ether, an unsaturated acid, functional monomers, an oxidizing agent, a reducing agent and a chain transfer agent, wherein the unsaturated acid consists of citric acid,acetic anhydride, acrylic acid and methacrylic acid according to a mass ratio of (1-3):(1-2):(2-3):(5-10), and the functional monomers are nano-diatomaceous earth and sulfonated melamine formaldehyderesin. According to the invention, the water reducer is synthesized by the allyl alcohol polyoxyethylene ether and the unsaturated acid, so that mixing performance of concrete can be improved, meanwhile, steel bars can be prevented from rusting, and the service life of the concrete is prolonged. Mutual reactions between cementing materials can be promoted through the functional monomers, and workability of the concrete is enhanced.

The invention discloses underwater self-compacting concrete and a preparation method thereof. The concrete is prepared from components in parts by weight as follows: 720-750 parts of coarse aggregate,450-500 parts of fine aggregate, 500-540 parts of cement, 200-240 parts of water, 140-155 parts of porous microspheres, 13-15 parts of a film-forming agent and 35-55 parts of a thickener, and the thickener comprises terpene-phenolic resin emulsion, epoxy resin and beta-terpene resin. The underwater self-compacting concrete and the preparation method thereof provided by the invention have the advantages that the fluidity is higher, the self-compacting effect is realized, the compactness and the strength are improved, and the underwater self-compacting concrete can be poured underwater and is not easy to disperse.

The invention discloses a production process, application and equipment for producing flow-state self-compacting backfill solidified soil by using a solidifying material, which comprises the following steps: taking soil, sludge and building residue soil as main solidifying materials, taking a catalyst and a solidifying agent as catalytic materials, taking tailings such as Portland cement, fly ash, phosphogypsum and lithium slag as auxiliary cementing materials, and adding a certain proportion of water, the mixture which has flowability and self-compaction performance and has certain strength and impermeability after being cured is formed, and the mixture can be widely applied to fertilizer groove backfilling, foundation reinforcement, road subgrade backfilling, mine goaf backfilling, municipal pipe gallery backfilling and wall decoration; according to different requirements of component properties of soil and strength of a finished product, the mass percent of each component material is as follows: 70-80% of soil; 5%-10% of a catalyst; 0.05% to 0.10% of a curing agent; 10%-20% of an auxiliary cementing material; the flowability and the water required by the reaction process are met. The material not only has high strength, but also has good flowability and water stability, is convenient to construct, is green and environment-friendly, and has a good application prospect.

The invention relates to the technical field of building materials, and particularly discloses self-compacting concrete and a preparation method thereof. The self-compacting concrete is higher in flowability and stronger in compressive strength. According to the technical scheme, the self-compacting concrete is characterized in that every cubic meter of self-compacting concrete is prepared from the following components: 155 to 170 kilograms of water, 350 to 400 kilograms of cement, 700 to 800 kilograms of sand, 960 to 1,000 kilograms of stones, 160 to 200 kilograms of a mineral additive, 5 to7 kilograms of an admixture, 1 to 4 kilograms of ultrafine powder and 2 to 5 kilograms of a modifier. According to the self-compacting concrete and the preparation method thereof, the concrete is prepared by mixing each raw material according to a certain proportion, so that the concrete is endowed with a higher gap passing rate and self-compacting capability, and can freely flow to fully fill aninternal space of a structure to form a uniformly compacted structure; the ultrafine powder is added into the concrete, so that the flowability of the concrete is further improved, and meanwhile, thecompressive strength is strengthened.

The invention relates to the technical field of concrete, in particular to self-compacting concrete and a preparation method thereof. The self-compacting concrete is prepared from the following components in parts by mass: 460 to 475 parts of water, 990 to 1013 parts of cement, 1960 to 1975 parts of medium sand, 2165 to 2190 parts of gravel, 105 to 116 parts of fly ash, 270 to 282 parts of mineral powder, 45 to 52 parts of a concrete pumping agent, 105 to 116 parts of an expansion anti-cracking agent and 5 to 10 parts of a concrete glue reducing agent, wherein the fineness modulus of the grain size of the medium sand is 2.4-2.8, and the grain size of the gravel is 5-20 mm; the concrete pumping agent is a Point-400H type pumping agent; and the expansion anti-cracking agent is an SY-G type expansion anti-cracking agent. The self-compacting concrete is prepared through primary mixing of materials, a hydration reaction and final mixing of the materials and has an excellent self-compacting effect; a preparation process is simple; and large-scale preparation of the concrete is facilitated.

The invention discloses a multifunctional box culvert pipe gallery concrete and a preparation method thereof. The multifunctional box culvert pipe gallery concrete is prepared from, by weight, 20-25 parts of cement, 8-12 parts of sand, 9-18 parts of aggregate, 5-8 parts of microbeads, 8-15 parts of fly ash, 12-18 parts of zeolite, 4-6 parts of waterborne resin, 0.6-1.5 parts of an expanding agent,1-3 parts of composite fiber, 0.7-2 parts of a water reducing agent component and 12-20 parts of total water. The self-compacting and working performance of concrete can be obviously improved, meanwhile, the self-curing performance is achieved, and vertical cracking of a large-size, ultra-long and thin-wall concrete gallery body structure can be effectively reduced.

The invention discloses a preparation method of unfired self-compacting concrete, wherein the unfired self-compacting concrete comprises the following production raw materials: cement, a mineral admixture, water, polyacrylonitrile-based carbon fibers, a water reducing agent, dolomite coarse aggregate and dolomite fine aggregate, wherein the per-square mixing amount of the dolomite coarse aggregateis 756 to 810 kg, and the per-square mixing amount of the dolomite fine aggregate is 835 to 859 kg. According to the invention, the self-compactness of the unfired concrete material is remarkably improved, and the unfired property of the material is further improved.