35results about How to "Enhanced pumpability" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention relates to the technical field of concrete admixtures, and discloses a nano rebound inhibitor for shotcrete and a preparation method thereof. The components, measured by weight, include 400-600 parts of nano microspheres, 400-550 parts of nano calcium carbonate, 10-30 parts of sodium carbonate, 1-10 parts of sodium aluminate, 10-30 parts of alum, 18-40 parts of polycarboxylic acid water reducer, and 0-0.5 parts of triterpenoid saponin; the nano microspheres are hydrated calcium silicate with silicon dioxide as the core material and colloid as the shell material, and the colloid is doped with a lithium source. The nano rebound inhibitor of the present application can significantly improve the state of shotcrete and greatly reduce the rebound amount of concrete, thereby further saving construction costs and accelerating construction accuracy. By utilizing the characteristics of the mineral admixture in the nano rebound inhibitor, the compactness of the concrete can be improved, and the durability of the shotcrete can be further improved.

The invention provides an underwater non-dispersible grouting material as well as a preparation method and application thereof, and relates to the technical field of constructional engineering. Specifically, the red mud concrete comprises the following components in parts by mass: 150-250 parts of red mud, 10-80 parts of Portland cement, 1-8 parts of an alkali activator, 3.5-10 parts of an anti-dispersing agent, 0.5-8 parts of a water reducing agent and a certain amount of water, wherein the alkali activator comprises biomass ash, tungstate, silicate, silica fume, arginine and inorganic alkali, and the anti-dispersing agent preferably comprises sodium alginate modified polyvinyl alcohol, a cellulose compound, stone powder and maltodextrin. The grouting material is obtained by recycling the red mud as a basic raw material, and has the advantages of excellent flowing state, excellent setting time, excellent compressive strength, better underwater dispersion resistance, better construction fluidity and better durability; the preparation process is simple, the performance is excellent, the environment-friendly effect is realized, and the application prospect is good.

The invention provides a low-cost admixture for shotcrete and a preparation method thereof. The raw materials for preparing the admixture include the following components by weight percentage: 40% to 50% silica fume, 5% to 10% fast-hardening sulphoaluminate cement, 35% to 45% reinforcing agent, 2% to 4% dispersant, 1% to 2% shrinkage reducing agent, and 0.5% to 1% regulator. The raw materials for the shotcrete admixture are widely available, cheap and easy to obtain, can significantly improve the cohesiveness and pumpability of the shotcrete, shorten the setting time of the shotcrete, have high bonding strength with the rock base, reduce the rebound rate of the shotcrete, and greatly save the project construction cost.

The invention relates to the technical field of dredged soil curing agents, in particular to a dredged soil pneumatic mixed flow curing agent and a preparation method thereof. The dredged soil pneumatic mixed flow curing agent is prepared from the following raw materials in parts by weight: 20 to 50 parts of cement, 10 to 40 parts of fly ash, 10 to 40 parts of mineral powder, 20 to 50 parts of quick lime, 0.01 to 0.1 part of retarder, 0.01 to 0.05 part of flocculant, 0.005 to 0.01 part of silane coupling agent and 0.1 to 0.3 part of hydrophobic adsorption type admixture. The hydrophobic adsorption type admixture, the silane coupling agent and the flocculating agent are doped into the curing agent raw materials at the same time and have a synergistic enhancement effect, so that the cohesiveness and the pumpability of curing agent slurry can be remarkably improved, the adaptability of the curing agent slurry and dredged soil in a pneumatic mixed flow process can be enhanced, the sensitivity to the water content of the dredged soil is reduced, and the curing agent has the advantages of being simple in preparation process and low in cost. The solidified soil is relatively stable in later-stage reinforcement, the solidifying agent is used in dredged soil pneumatic mixed-flow solidification production, the pumping constructability, the dispersion resistance in water and the hardening performance of the solidified soil can be remarkably improved, and the solidifying agent is suitable for filling projects such as sea reclamation and backfilling.

The invention belongs to the technical field of building material production, and particularly relates to a method for manufacturing recycled concrete by using building solid waste and unfired lightweight aggregate waste, which comprises the following specific steps: step 1, collecting the solid waste generated by building, sorting impurities in the building solid waste through magnetic separation and impurity sorting, and recycling the impurities in the building solid waste; when the building solid waste and the unfired lightweight aggregate are processed into blocks, the blocks are poured into the negative pressure bin to be reinforced, so that the hardness is higher, in the later use process, the pressure resistance and the tension resistance are higher, in the preparation process, the anti-freezing water reducing agent, the regulator, the corrosion inhibitor and the expanding agent are added, and the anti-freezing effect is better. The flowability and pumpability of the concrete can be improved, so that the construction efficiency and quality are improved, the durability of the concrete is enhanced, the chemical corrosion and physical damage resistance of the concrete is improved, and the density, color and volume stability of the concrete can be adjusted to meet the requirements of specific engineering.

The invention relates to a concrete filled steel tube arch bridge rib core ultra-high performance concrete mix proportion design method, which comprises the following steps: (1) taking slump, expansion and 28d compressive strength as response values, and adopting a response surface method to carry out mix proportion optimization design on a water-binder ratio and the composition of a cementing material to obtain the optimal value of the water-binder ratio and the composition of the cementing material; and (2) taking the slump, the expansion degree, the relative pressure bleeding rate, the segregation rate, the 28d compressive strength and the 28d elastic modulus as response values, and performing optimization design on the steel fiber mixing amount, the coarse aggregate and the binder ratio by adopting a response surface method to obtain the optimal values of the coarse aggregate substitution rate, the steel fiber volume mixing amount and the binder ratio. The concrete-filled steel tube core steel fiber ultra-high performance concrete mix proportion designed by adopting a response surface method can have good pumping performance under the condition of not performing high-temperature steam curing, and has the characteristics of high strength, high elastic modulus, micro-expansion and the like.

The preparation method comprises the following steps: uniformly stirring steel slag and tailings according to a mass ratio of (2-3): (7-8) at a high speed, adding water, continuously stirring to obtain a turbid solution, slowly adding sodium silicate into the turbid solution under high-speed stirring to obtain a mixed solution, simultaneously dropwise adding a water reducing agent and a thickening agent into the mixed solution under stirring, and uniformly stirring to obtain a slurry; and finally, carrying out a slump test on the mixture, and determining the addition amount of silica gel or water according to a test result, so as to obtain the flow-state solidified soil based on the large-particle waste residues. According to the method, through the innovative material ratio and preparation process, the stirring and pumping performance of the large-particle material is improved, the segregation risk is reduced, the homogeneity and stability of the fluid-state solidified soil are improved, meanwhile, the production cost is reduced, batch consumption of a large amount of solid waste is achieved, and the problem that use of the large-particle material in traditional fluid-state solidified soil is limited is solved.

The invention discloses high-compactness low-resilience shotcrete and a preparation method thereof, and relates to the field of shotcrete, the preparation method comprises the following steps: (1) respectively stacking a cementing material, a fine aggregate and a coarse aggregate by adopting an MAA model to obtain a design ratio of each internal raw material; and (2) fully mixing the cementing material, the fine aggregate, the coarse aggregate and the elasticity reducing agent which are obtained according to the design ratio in the step (1), adding water and a water reducing agent for mixing, and doping an accelerator in a manner of mixing with pressurized air to obtain the high-compactness low-resilience sprayed concrete. The early-strength elasticity reducing agent is adopted, pumpability of the sprayed concrete is improved, early hydration of the concrete is accelerated, under the combined action of the early-strength elasticity reducing agent and the alkali-free accelerator, the early mechanical property of the sprayed concrete is rapidly improved, and the construction efficiency of the sprayed concrete is improved. And by adopting multi-section close packing, close filling structures are respectively formed in the cementing material, the fine aggregate and the coarse aggregate, so that the plastic viscosity of the slurry and the compactness of the concrete are effectively improved.

The invention relates to the technical field of renewable concrete, in particular to renewable concrete and a production process thereof, and the concrete is prepared from the following raw materials: recycled aggregate, waste plastic fiber, cement, an additive component and water, the production work comprises the following steps: recycling, crushing and classifying the building waste, crushing and grinding the building concrete waste and storing the building concrete waste as aggregate, screening and storing other materials required by concrete preparation, stirring and mixing, storing the concrete, and conveying the concrete into a mixer truck for transferring. By using the recycled aggregate and the waste plastic fiber, the waste building material and corresponding plastic can be effectively recycled and used, the environmental protection performance can be better improved, the waste material can be quickly solved, and the strength and performance of the product can be improved; and meanwhile, how to use each device and how to prepare the recycled concrete by workers are clearly indicated.

The invention relates to the technical field of hole filling materials around a shield, and discloses a hole filling material around the shield and a preparation method and application of the hole filling material around the shield. The mass ratio of the sodium bentonite to the calcined kaolin to the organosilicon waterproofing agent to the fly ash to the building retarder to the thickening agent in the component A is (25%-28%): (25%-28%): (2%-4%): (2%-3%): (2%-4%): (0.04%-0.08%), and the balance is water; and the component B comprises a sodium silicate aqueous solution. The material disclosed by the invention can be applied to a soft soil area, and the shield periphery pore filling material has good pumpability, so that the shield periphery pores can be quickly filled; and in addition, the reaction is rapid, the certain viscosity is achieved, and the final supporting performance reduction caused by solid-liquid separation of the shield periphery hole filling material in the reaction process can be avoided.

The invention belongs to the technical field of concrete, and particularly relates to colored black iron powder micro-expansion self-compaction bare concrete which comprises cement, coal ash, fibers, an expanding agent, fine aggregate, coarse aggregate, black iron powder, an additive and water, the fine aggregate is two-zone shaping medium sand, the coarse aggregate is shaping pebbles, the particle size of the pebbles is 5-20 mm, the black iron powder is continuously graded, and the additive is water. The admixture comprises the following raw materials: a water reducing agent, a viscosity reducer, a slump retaining agent, a workability improving agent, a retarder and a defoaming agent, and the doping amount of the admixture is 2.2%-2.7% of the weight part of the cementing material (cement, fly ash and the expanding agent). The invention further provides a construction method of the colored black iron powder micro-expansion self-compaction bare concrete. The method can reduce and even avoid surface defects of concrete, particularly controls bubbles and colors on the surface of the concrete, controls shrinkage cracks of the bare concrete, has crack resistance, is low in hydration heat, and avoids temperature difference cracks of the bare concrete in the early stage.

The invention discloses a preparation method of coal gangue ceramsite concrete with the surface wrapped with ash. The method comprises the following steps: 1, preparing cement, fly ash or mineral powder and silica fume into a composite cementing material, and stirring by using a stirrer until the materials are uniformly mixed; 2, quantitatively weighing the composite cementing material and the coal gangue ceramsite obtained in the step 1; (3) pouring the ceramsite weighed in the step (3) into a granulator, starting the granulator, adding the composite cementing material weighed in the step (2) in three times, and spraying water which is 1 / 3 of the total water consumption in three times by using a sprinkling can when the composite cementing material is added every time, so as to obtain the ceramsite subjected to ash wrapping treatment; 4, the ceramsite obtained after ash wrapping treatment is cured; and 5, preparing the coal gangue ceramsite concrete by using the coal gangue ceramsite subjected to ash wrapping treatment to completely replace coarse aggregate. The water absorption rate of the coal gangue ceramsite can be reduced, and the method has the characteristics of simplicity and convenience in operation and convenience in implementation and popularization.

The utility model discloses efficient sand blowing equipment for large-scale sea reclamation engineering, which comprises a water supply pipeline mechanism, the water supply pipeline mechanism is arranged in a water source, a water outlet end of the water supply pipeline mechanism is connected with an overwater mixed flow pipeline, a sand supply funnel is arranged on the overwater mixed flow pipeline, and a water outlet of the overwater mixed flow pipeline is connected with a sand blowing mechanism. Further, the water supply pipeline mechanism comprises a water supply pipe and a water pump, the lower end of the water supply pipe extends into the seawater, the upper end of the water supply pipe is connected with the overwater mixed flow pipeline, and the water pump pumps the seawater through the water supply pipe and feeds the seawater into the overwater mixed flow pipeline. (1) sand can be directly unloaded to the funnel by adopting the belt ship, a water area does not need to be expropriated as a sand storage pit, and hydraulic reclamation pipelines are immersed pipes, so that the water area passing is not influenced; (2) the water flow of the active water supply system washes the funnel through the guide pipe and carries the machine-made sand to enter the dredge pump to prevent clogging; and (3) the capacity is high, the pumping capacity of machine-made sand is effectively realized by additionally arranging a water pump and a side pipe orifice, and the actually measured maximum sand blowing efficiency can reach 4760m < 3 > / h.

The present invention relates to the technical field of lubricating grease, and in particular to a shield tail lubricating grease for a shield machine and a preparation method thereof, which comprises the following components by weight: 25-55 parts of base oil, 10-25 parts of fiber material, 20-40 parts of filler, 10-30 parts of viscosity promoter and 15-25 parts of lubricant, wherein the lubricant is a modified nano-silicon dioxide-modified graphene composite material. The present invention adopts a shield tail lubricating grease for a shield machine with the above structure and a preparation method thereof, which solves the problems of low lubricity, poor adhesion and low pumping efficiency of the shield tail lubricating grease in the prior art.

The application discloses a kind of high density low rebound shotcrete and preparation method thereof, it is related to shotcrete field, and preparation method includes: (1), respectively to cementitious material, fine aggregate, coarse aggregate is using MAA model to be packed and the design ratio of each raw material in interior is obtained;(2), cementitious material, fine aggregate, coarse aggregate and the rebounding agent of design ratio obtained according to step (1) are fully mixed, water, water reducing agent is mixed, then by the way of mixing with pressurized air, incorporate accelerator, obtain high density low rebound shotcrete.The application uses early strength rebounding agent, improves the pumpability of shotcrete, accelerates the early hydration of concrete, under the joint action of alkali-free accelerator, rapidly improves the early mechanical properties of shotcrete, improves shotcrete construction efficiency.Multiple close packing is used, and cementitious material, fine aggregate, coarse aggregate respectively form close packing structure, effectively improve the plastic viscosity of paste and the compactness of concrete.

The application discloses a preparation method of low-shrinkage low-heat low-carbon concrete, and has the technical characteristics that high-water-absorption autoclaved silicate functional aggregate is used to replace gravel and yellow sand, and the mass sum of fly ash and mineral powder in the cementing material can be up to 60% at most. The high-water-absorption water-saturated autoclaved silicate functional aggregate and the expanding agent are added into the concrete, the humidity is released through the functional aggregate, the internal curing and the expansion of the expanding agent are cooperated, the self-shrinkage, the drying shrinkage and the hydration heat shrinkage of the concrete are reduced, and the strength of the concrete is improved; the grading of the fine aggregate of the superfine yellow sand is improved through the addition of the fine functional aggregate, the working performance of the concrete is improved, and the low-carbon environmental protection of the concrete is realized through the large amount of mineral admixtures.

The invention discloses a water reducing agent modified basalt fiber reinforced cement concrete and a preparation method thereof, and belongs to the technical field of material and traffic crossing. The preparation method comprises the following steps: firstly, synthesizing a water reducing agent containing carboxyl, amino and a polyether side chain, and carrying out surface chemical grafting modification on basalt fibers subjected to alkali liquor hydroxylation treatment by using the water reducing agent to obtain modified basalt fibers; during concrete preparation, the modified basalt fiber is added into a concrete dry material according to a specific volume mixing amount to be dispersed, and the water reducing agent dry material is further doped during wet mixing. Through dual application of the water reducing agent in fiber modification and concrete compounding, the interface bonding force between the fiber and a cement matrix and the dispersity of the fiber in concrete are synergistically improved, and the problem that the workability and the mechanical property of the concrete are difficult to consider at the same time under the condition of high mixing amount of the basalt fiber is solved; the strength and durability of the concrete are remarkably improved while excellent construction fluidity is guaranteed, and the engineering application range of the concrete is expanded.

The invention relates to the technical field of sewage treatment plants, and discloses the following steps: selecting late-strength low-heat ordinary Portland cement or coal mine cement with the grade of 42.5 or above; a high-efficiency water reducing agent or a composite additive with a high-efficiency water reducing function and a high-performance expanding agent are added in concrete preparation; clean coarse aggregate with good natural continuous grading quantity is selected as the coarse aggregate to prepare concrete. The high-efficiency retarding type water reducing agent is adopted, so that the absolute cement consumption and water consumption are reduced, the workability and the pumpability of the concrete are improved, and the retarding time is prolonged; the high-performance expanding agent is doped, so that the concrete generates moderate expansion, and the stress structure in the concrete is changed to offset the tensile stress generated by shrinkage in the concrete hardening process, thereby avoiding or greatly reducing the cracking of the reinforced concrete structure; and a proper amount of mineral mixing materials such as high-quality fly ash and slag are doped to reduce the cement consumption, so that the total hydration heat of the cement is reduced, and cracks are reduced.

The invention relates to the technical field of laminated slabs, and particularly discloses a laminated slab and a preparation method thereof. The laminated slab comprises a prefabricated layer, a steel reinforcement framework and a laminated layer, the reinforcement cage is located in the prefabricated layer, a grid-shaped groove is formed in one side of the prefabricated layer, the laminated layer is formed by pouring concrete on one side of the grid-shaped groove, the concrete adopts limestone powder and slag to partially replace cement, and silica fume is used for carrying out slurry wrapping reinforcement on recycled coarse aggregate and iron ore waste rock. Machine-made sand and fine river sand are used as fine aggregates, basalt fiber textile yarns are added as reinforcing ribs, and finally additives such as a viscosity modifier and a modified polycarboxylate superplasticizer are added, so that the concrete is prepared. The prepared concrete has the advantages of good workability, strong pumpability, high compressive strength and splitting tensile strength, and large equivalent bending strength ratio and toughness index, and is suitable for preparation of laminated slabs.

The invention aims at solving the problems of complex process, high concrete cost, high carbon emission and the like in the prior art, and provides premixed concrete for pumping by taking mine solid waste as a raw material and a preparation method of the premixed concrete. The invention relates to premixed concrete for pumping by taking mine solid waste as a raw material. The premixed concrete consists of aggregate, a cementing material, water and an additive. The raw materials of a cementing material in the concrete are granulated blast-furnace slag and desulfurized fly ash and do not contain cement clinker, and the aggregate is iron tailing sand, barren rock machine-made sand and barren rock coarse aggregate. The problems of high cost and high carbon dioxide emission when the cement clinker is used as a cementing material are solved while a large amount of industrial solid wastes such as tailings and barren rocks are utilized. The concrete shows excellent working performance and mechanical property, can be applied to various engineering scenes such as road operation, mining filling materials and the like, and is a good substitute of cement concrete.

This invention discloses a method, equipment, and storage medium for dynamic control of concrete mix proportions, relating to the field of concrete production technology. The method includes: real-time acquisition of four types of data during concrete production: raw materials, mixing process, environmental conditions, and the performance of fresh concrete; multi-source fusion processing of each type of data to generate corresponding state sub-vectors; concatenation of these sub-vectors into a production state vector; generation of an initial mix proportion control amount based on the deviation between the production state vector and the target state vector, combined with a control gain matrix; obtaining the final mix proportion control amount after applying control constraints; and online correction of the mix proportion parameters to achieve dynamic closed-loop control. This invention upgrades concrete production from static setting to multi-source sensing and dynamic optimization, significantly reducing slump fluctuations, segregation and bleeding risks, and strength dispersion, while improving pumpability and long-term stability.

This invention relates to the field of sealing grease technology, and more particularly to a high-performance, flame-retardant water-based shield tail sealing grease, its preparation method, and its application. The sealing grease comprises, by mass percentage: 10%–25% polyalphaolefin, 15%–30% polyisobutylene, 10%–25% sodium poly(isobutylene-alt-succinate), 10%–18% deionized water, 20%–30% filler, 1%–15% thickener, and 1%–3% reinforcing fibers. Specifically, the polyalphaolefin and polyisobutylene constitute a continuous oil phase, while the sodium poly(isobutylene-alt-succinate) dissolves or disperses in the deionized water and accumulates at the oil-water interface, allowing the deionized water to be stably dispersed as an internal phase, forming a water-in-oil structure. The sealing grease of this invention has moderate zero-point penetration, excellent pumpability, reliable sealing under 3.5MPa water pressure, good erosion resistance under both fresh and seawater conditions, and an ignition point of not less than 295℃. It also has excellent flame retardancy and environmental friendliness, and is suitable for shield tail sealing in long-distance, deep-buried and high-water-pressure shield tunnel construction.

This invention discloses a self-activated solid waste slurry and its preparation method, comprising waste slag, a solid waste cementitious material, and water. The components are expressed as follows by weight percentage or parts: 100 parts waste slag; 15-60 parts solid waste cementitious material, wherein the solid waste cementitious material consists of a silicon-aluminum rich precursor, a strongly alkaline activation source, and a rheology-modifying supplementary source, with a mass ratio of 1:(0.2-0.8):(0.1-0.4); and water. This invention eliminates the highly corrosive liquid chemical activator required in traditional alkaline activation materials, achieving self-activation through dry powder premixing of a strongly alkaline activation source, a silicon-aluminum rich precursor, and a rheology-modifying supplementary source.

The invention relates to the technical field of concrete, in particular to a preparation method of C30 pump concrete with heat resistance of 700 DEG C. The preparation method comprises the following steps: S1, preparing materials; and S2, the basalt macadam, the basalt machine-made sand and the natural sand are stirred and mixed, and then the cement, the fly ash and the mineral powder are added for mixing and stirring. S3, finally adding water and a pumping agent, and stirring; s4, taking out a sample from the stirred concrete for sample preparation, and performing compression resistance and heat resistance tests to ensure that the concrete meets design requirements; and S5, the stirred concrete is conveyed to a place needing to be poured through a pump truck, and the concrete is cured. According to the invention, the concrete can meet the construction requirements in a higher-temperature environment, and the application range is widened.

This application relates to the field of concrete technology, specifically disclosing a fair-faced concrete and its preparation method. The raw materials for fair-faced concrete include cement, fly ash, mineral powder, glass powder, sand, reinforcing coarse aggregate, water, water-reducing agent, defoamer, and pumping agent; the preparation method is as follows: (1) cement, fly ash, mineral powder, glass powder, sand, and reinforcing coarse aggregate are added to a mixer and mixed evenly; (2) water, water-reducing agent, defoamer, and pumping agent are added to the mixer and mixed evenly to obtain fair-faced concrete. The fair-faced concrete of this application has the characteristics of high strength and high fluidity. Therefore, the vibration step is omitted during the construction and pouring process, greatly shortening the construction cycle, reducing the possibility of operational errors, and reducing rework costs.

The invention discloses a karst-related area interval underpass construction method, and relates to the technical field of tunnel engineering, and the karst-related area interval underpass construction method comprises the following steps: carrying out field classification and improvement treatment on soft rock muck discharged by shield tunneling to obtain aggregate muck which can be directly used for backfilling and fine-grain muck which can be used for preparing grouting slurry; muck improvement slurry is prepared from fine muck, karst cavities on the construction path are pre-filled, and advanced grouting reinforcement is conducted on the stratum of the underpass section; during the period that shield tunneling penetrates through a karst area or penetrates through an existing structure under the karst area, synchronous grouting is conducted through muck improvement grout, and grouting parameters and tunneling parameters are dynamically adjusted according to real-time monitoring data; and after segmental lining is completed, compensation grouting is conducted through muck improved grout, and a stacked grouting supporting system is formed in the surrounding rock. According to the method, the shield muck can be recycled, the grouting material cost is reduced, and the safety and reliability of shield underneath pass construction are ensured.

This application relates to the field of lubricating materials, specifically disclosing a biodegradable semi-fluid lubricant for locomotive wheel flanges and its preparation method. The biodegradable semi-fluid lubricant for locomotive wheel flanges comprises the following raw materials in parts by weight: 35-58.4 parts trimethylolpropane ester, 30-40 parts vegetable oil, 5-10 parts thickener, 1-3 parts extreme pressure anti-wear agent, 0.5-2 parts antioxidant, 0.1-1 parts rust inhibitor, and 5-10 parts solid filler. The biodegradable semi-fluid lubricant for locomotive wheel flanges of this application exhibits excellent viscosity-temperature properties, extreme pressure anti-wear properties, water resistance, rust prevention, pumpability, and atomization properties. It also has a high biodegradability rate, avoiding pollution to soil and water bodies, and is suitable for lubrication and protection of locomotive wheel flanges in various environments.

The invention relates to the technical field of concrete, and discloses a low-standard machine-made sand concrete for super high-rise pumping, which comprises the following components: 240-270 parts by weight of cement, 60-80 parts by weight of mineral powder, 90-120 parts by weight of fly ash, 800-860 parts by weight of machine-made sand, 900-950 parts by weight of stone, 160-170 parts by weight of clear water, 4-6 parts by weight of admixture and 4-6 parts by weight of cellulose ether. According to the preparation method of the low-standard machine-made sand concrete for super high-rise pumping, by optimizing the mass ratio of the mineral powder to the fly ash to the machine-made sand to the stone to the clear water to the additive, it is ensured that the concrete has excellent fluidity and stability, so that the concrete can smoothly pass through pumping equipment and has excellent performance in high-altitude operation; by means of the accurate proportioning and mixing process, the concrete obtains good workability, high pumpability can be maintained even under the pumping condition of a super high-rise building, the pump damage phenomenon is reduced, the common problems of pipe burst and pump blockage in the construction process are effectively avoided, and therefore the construction efficiency and safety are improved.

The invention discloses calcium-based lubricating grease with an anti-hardening function and a preparation method of the calcium-based lubricating grease, and belongs to the technical field of gear lubricating grease. The prepared lubricating grease is endowed with excellent high temperature resistance, good extreme pressure wear resistance, hardening resistance and pumping performance through calcium and aluminum composite thickening; the use amount of the calcium acetate powder in the raw materials is large, the cost is saved, the peculiar smell in the production process is small, and the health of production personnel can be protected; the lubricating grease is synthesized by adopting a one-kettle method, the equipment is simple, the process is coherent, and the synthesized lubricating grease does not contain harmful elements such as heavy metals and is environment-friendly; various groups in molecules of the prepared synergistic antioxidant play a synergistic role, and the oxidation resistance and extreme pressure wear resistance of the lubricating grease can be greatly enhanced to a certain extent; therefore, the prepared lubricating grease has important application value in the technical field of gear lubricating grease, and is suitable for mechanical equipment such as transmission bearings and hubs in a high-temperature environment.