15results about How to "Controllable clotting time" patented technology

The invention belongs to the technical field of concrete, and particularly relates to II-type anhydrous gypsum premixed concrete and a preparation method thereof. The II-type anhydrous gypsum premixed concrete is prepared from the following raw materials in parts by weight: 25 to 28 parts of II anhydrous gypsum, 5 to 7 parts of semi-hydrated gypsum powder, 1.2 to 1.6 parts of calcium silicate, 0.2 to 0.5 part of an additive, 7 to 11 parts of water, 29 to 35 parts of gravel and 28 to 32 parts of mountain sand. The use amount of phosphogypsum is up to 95% or above, and the setting time is controllable and easy to adjust. The coating has the properties of high early strength, wear resistance, corrosion resistance and the like.

The invention relates to the technical field of cement grinding aids, in particular to a composite liquid cement grinding aid and a preparation method of the composite liquid cement grinding aid. Maleic anhydride, triethanolamine, acrylic acid and isopentenyl polyoxyethylene ether are used as raw materials in a macromolecular grinding aid solution; a reaction product of maleic anhydride and triethanolamine can form a compound with special functional groups, the functional groups can be effectively adsorbed on the surfaces of cement particles, friction among the particles is reduced, the grinding efficiency is improved, and the dispersity and stability of the grinding aid can be further enhanced by adding acrylic acid and isopentenyl polyoxyethylene ether, so that the grinding aid has a good application prospect. The cement particles are more easily dispersed in water, the agglomeration phenomenon is reduced, and the refining of the cement particles is facilitated; according to the invention, sodium lignin sulfonate is modified by grafting diethanolamine, and on the basis of retaining the original dispersibility of sodium lignin sulfonate, a new functional group is introduced, so that the interaction between sodium lignin sulfonate and cement particles can be enhanced, and the grinding aiding effect is further improved.

The application relates to the technical field of admixtures for building materials, in particular to a special polycarboxylic water reducing agent for gypsum boards, which comprises the following steps: S1, preparing a multifunctional monomer mixed solution; S2, preparing an initiation system: dissolving polyether macromonomer and a chain transfer agent in part of water, placing the water in a reactor, heating to a preset temperature and keeping constant; S3, performing a gradient copolymerization reaction: under the constant temperature condition, synchronously and slowly adding the multifunctional monomer mixed solution and an oxidant aqueous solution into the initiation system; S4, performing aging and post-treatment: after the addition is completed, keeping constant temperature aging at the preset temperature, then reducing the temperature, and neutralizing with lye until the pH value is 6-7, so that the special polycarboxylic water reducing agent is obtained. The whole process does not need toxic and harmful raw materials such as formaldehyde and naphthalene, and conforms to the green chemistry direction. The problems of demolding difficulty and production line congestion caused by retardation are solved, and the mold turnover rate and the production line efficiency are significantly improved. Under a higher water reducing rate, lower porosity (non-bubble pore) and higher compactness can be obtained.

This invention discloses a water-resistant magnesium phosphate repair mortar based on industrial waste residue and its preparation method, comprising mineral admixtures, potassium dihydrogen phosphate, magnesium oxide, quartz sand, organosilicon gel, retarder, and mixing water; the mineral admixtures are composed of steel slag, nickel slag, and fly ash. During preparation, potassium dihydrogen phosphate, retarder, and mixing water are first mixed and stirred, then the mineral admixtures, magnesium oxide, and organosilicon gel are added sequentially and stirred rapidly, and finally the quartz sand is added and stirred. The repair mortar of this invention exhibits a setting time ≥23 min, fluidity ≥195 mm, 3-hour compressive strength ≥25.2 MPa, 3-day compressive strength ≥47.4 MPa, 3-hour flexural strength ≥3.6 MPa, 3-day flexural strength ≥6.1 MPa, and 1-day tensile bond strength ≥0.8 MPa; and a water absorption ratio below 0.15.

This invention relates to a two-component polymer sulfoaluminate cement grouting material for high-temperature geothermal environments, its preparation method, and its application, belonging to the technical field of grouting materials. The grouting material comprises component A and component B. By mass percentage, component A includes 90-95 parts sulfoaluminate cement, 5-10 parts silica fume, 0.15-0.20 parts water-reducing agent, 0.25-0.75 parts retarder, 0.50-0.80 parts defoamer, and 50-60 parts water; component B includes 1.32-4.17 parts water-based epoxy resin emulsion and 1.06-3.75 parts water-based epoxy curing agent. During preparation, the water-reducing agent and retarder in component A are first dissolved in water, then the remaining powder is added and stirred to form a slurry; component B is premixed uniformly; components A and B are then mixed on-site for use. This material is suitable for grouting reinforcement and water-blocking projects in high-temperature strata such as high-temperature tunnels and high-temperature mines.

The invention relates to the field of grouting construction research, in particular to a double-slurry sectional type grouting device and method based on a triple pipe, and the device comprises a triple pipe assembly, a triple pipe connector, a conversion connector, a grouting plug assembly and a hose connector assembly. Compared with a device in the prior art, the device is low in lowering and recycling accident rate, stable in setting and unsetting performance and capable of effectively separating hole sections, so that the hole sweeping workload is reduced, the operation difficulty is lowered, the grout setting time is controllable, invalid diffusion of grout is effectively prevented, grouting materials are saved, the grouting targeting performance is accurate, and the grouting efficiency is improved. And a water-rich stratum with relatively high underground water flow velocity and flow can be quickly blocked. Particularly, a triple pipe assembly is additionally arranged in the device and used in cooperation with other components, in-pipe separated conveying and out-pipe mixed pouring of the double-liquid slurry can be achieved, and the risks that after the double-liquid slurry is mixed in the pipe, the double-liquid slurry can be rapidly solidified to block a grouting pipeline, and damage is caused by extrusion, congestion, excessive stretching and the like in the lowering and recycling process are avoided.

The invention belongs to the technical field of grouting materials, and particularly discloses a flowing water grouting material and a preparation method and application thereof. The flowing water grouting material provided by the invention comprises a component A and a component B which are prepared according to the weight ratio of 3.0: 1-5.5: 1, wherein the component A comprises calcium hydroxide, mineral powder, a water reducing agent and water; and the component B comprises strong alkali, soluble carbonate, water glass and water. The grouting material provided by the invention can be combined with a grouted body under a flowing water condition, not only has anti-dispersion and anti-scouring capabilities, but also has the advantages of high stone rate, fast stone body strength increase, excellent environmental protection performance and the like, and the setting time is adjustable. The method is suitable for water guide channel plugging of water inrush or curtain construction under the flowing water condition, and is suitable for the field of underground water disaster control.

The invention relates to the technical field of soft soil treatment, and discloses a curing agent for coastal soft soil and a manufacturing process of the curing agent. The process comprises the following steps: carrying out coarse and fine grading pretreatment on the furnace bottom slag, carrying out acid activation treatment on the zeolite powder, carrying out surface modification treatment on the basalt fiber, preparing a component A delayed coagulation curing agent, preparing a component B coagulation accelerating curing agent, and compounding the two components in proportion for use. The curing speed can be adjusted within 15-90 minutes by compounding the component A and the component B according to different mass proportions, and a double-phase structure of a rigid framework and a gelling matrix is formed by the surface modified basalt fibers and graded furnace bottom slag coarse particles. The rheological property of slurry is adjusted through selective ion adsorption of acid activated zeolite powder and molecular chain extension of hydroxypropyl methyl cellulose, and the technical problems that a coastal soft soil curing agent is large in brittleness, poor in construction adaptability, non-adjustable in curing speed and low in synergistic utilization rate of various solid wastes are solved.

The present invention discloses an underground high-pressure gas storage cavern lining concrete and a preparation method thereof, wherein the lining concrete comprises the following raw materials in parts by weight: aggregate: 230-280 parts by weight; cement: 65-80 parts by weight; fly ash: 10-20 parts by weight; mineral powder: 10-15 parts by weight; compounding agent: 0.5-0.8 parts by weight; anti-cracking agent: 0.6-1.6 parts by weight; expansion agent: 6-8 parts by weight; fiber: 0.16-0.92 parts by weight. The underground high-pressure gas storage cavern lining concrete prepared by using the above raw materials in parts by weight has good compressive strength, fatigue resistance and load performance, and excellent crack resistance. During the operation of the underground gas storage, the lining concrete meets the requirements of high temperature (100°C-200°C) and air pressure circulation, and no through cracks are generated in the concrete. At the same time, the lining concrete has high air tightness, low cost, and convenient construction.

The invention provides a novel mortar additive and a preparation method thereof, and relates to the technical field of building materials, and the novel mortar additive is prepared from the following raw materials: polyacrylamide, silanol, silicon dioxide, sodium gluconate, a surfactant, a defoaming agent, an early strength agent, a retarder and a plastic retaining agent. The working performance of the mortar is improved, the setting time of the mortar is adjusted, the durability of the mortar is enhanced, the mortar can keep good performance under different conditions by integrating the functions of various raw materials, the construction quality and efficiency are improved, and meanwhile, through reasonable matching of the raw materials, on the premise that the performance of the mortar is guaranteed, the construction cost is reduced. The consumption and waste of raw materials are reduced, and the production cost is reduced.

The invention discloses modified aluminate cement, carbon sequestered phosphoaluminate cement and a preparation method, based on the mineral phase activity and hydration characteristics of aluminate cement, the mineral phase content of CA and CA2 in the aluminate cement and the (CA / CA2) ratio are regulated and controlled within the range of 0.5-1.5, mineral phase matching is optimized, and the engineering performance of the phosphoaluminate cement is improved. The phosphoaluminate cement obtained by compounding the modified aluminate cement, phosphate and an admixture has adjustable setting time, high early strength and later strength and excellent CO2 corrosion resistance, and a novel cementing material is provided for carbon sequestration. And meanwhile, the concrete also has excellent anti-permeability, sulfate corrosion resistance, high temperature resistance, freezing resistance and repairing performance.

The invention discloses a road building material prepared from pure ardealite and a preparation method of the road building material, and relates to the technical field of solid waste resource utilization and building materials. 3%-15% of sulphoaluminate cement; 0.01%-5.0% of an additive; the sulphoaluminate cement is co-produced by a process of decomposing phosphogypsum to prepare acid, the additive is a stabilizer and / or an adhesive, the stabilizer is one or more of metakaolin, silica fume or fly ash, and the adhesive is a high-molecular polymer. According to the road building material prepared from the pure ardealite and the preparation method, the total dosage of the ardealite tends to 100%, waste is turned into wealth in a real sense, and a revolutionary solution is provided for consumption of a large amount of the ardealite.

The invention relates to the technical field of building materials, in particular to a coupling coarse aggregate and a preparation method and application thereof.The coupling coarse aggregate takes waste tempered glass particles with the particle size of 5-40 mm as an inner core, the inner core is coated with a red mud-based cementing material layer with the thickness of 1-5 mm, and the coating layer is composed of, by weight, 70-80 parts of red mud, 10-15 parts of fly ash and 5-20 parts of cement. The preparation method comprises the following steps: crushing and screening waste toughened glass, preparing red-mud-based gel slurry, coating the surfaces of glass particles with the red-mud-based gel slurry in a dip-coating or roll-coating manner, and carrying out standard curing for 28 days to obtain the coupling coarse aggregate. The aggregate can replace natural coarse aggregate to prepare large-dosage red mud-based concrete, wherein a cementing material comprises red mud, mineral powder, ardealite and cement. According to the invention, the alkali-silicon reaction is effectively blocked through the core-shell structure, and the aggregate-matrix interface performance is improved, so that the concrete has high compressive strength, excellent durability and low expansion rate, meanwhile, the synergistic resource utilization of bulk solid wastes of the red mud and the waste toughened glass is realized, and the concrete has remarkable environmental protection and economic benefits.

The application discloses an early-strength heat-insulation type light plastering gypsum mortar and a preparation method thereof. The early-strength heat-insulation type light plastering gypsum mortar comprises the following raw materials in parts by weight: 550-800 parts of gypsum powder, 100-300 parts of heavy calcium, 100-300 parts of light aggregate, 50-100 parts of inorganic retarder, 1-5 parts of early-strength water reducing agent, 1-5 parts of reinforcing agent, 1-4 parts of cellulose ether, 5-15 parts of redispersible latex powder and 400-450 parts of water. The early-strength water reducing agent is prepared by reacting high-purity gypsum and polycarboxylic acid water reducing agent solution, and high-activity functional groups in the polycarboxylic acid water reducing agent are inlaid on the surface of fibrous calcium sulfate whiskers. The light aggregate is prepared from autoclaved aerated concrete. The inorganic expanding agent is used to adjust the setting time, the early-strength water reducing agent and the reinforcing agent are used to improve the compressive strength and bonding strength of the gypsum mortar, and the autoclaved aerated concrete is used to replace traditional light aggregates such as vitrified small balls and expanded vermiculite, so that the heat preservation performance of the gypsum mortar is improved.

This invention discloses an eco-friendly concrete cementitious material and eco-friendly concrete, belonging to the field of building materials technology. This invention provides an eco-friendly concrete cementitious material that significantly improves the mechanical properties of eco-friendly concrete through the scientific compounding and synergistic effect of its components. Sulfoaluminate cement, as the main cementitious material, provides early strength and micro-expansion characteristics, effectively compensating for shrinkage. Mineral powder and silica fume, as active mineral admixtures, not only exert a micro-aggregate filling effect, densifying the microstructure of the hardened body, but also consume Ca(OH)2 in the system through a secondary hydration reaction, initially reducing the risk of efflorescence. Gypsum not only regulates the setting time but also promotes the formation of ettringite, improving the strength of the concrete matrix. By adding modified mesoporous silica, the alkali-sealing performance and mechanical properties of eco-friendly concrete can be significantly improved.