11results about How to "Enhanced pumpability" patented technology

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.

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.

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 discloses a loess cutting slope crack self-repairing material based on natural rubber viscosity change and a preparation method thereof, and relates to the technical field of repairing material preparation. The self-repairing material comprises natural rubber, a non-aqueous phase dispersant, a cross-linking agent, a cross-linking auxiliary agent, water and a pH regulator, wherein the natural rubber is natural polysaccharide containing cis-ortho-hydroxyl; the cross-linking agent is a boron-containing compound. The invention aims to develop the flowing slurry based on the natural rubber, the slurry can be converted into high-viscosity and high-elasticity gel from low-viscosity fluid within preset time, loess cracks are effectively filled and blocked, the slurry can adapt to tiny deformation of strata, and the self-repairing effect is achieved. The problems that an existing crack repairing material is high in cost and poor in effect are solved.

The invention relates to the technical field of tunnel grouting construction, in particular to a grouting method based on a graphene cement-based material in a deep underground space. The preparation method comprises the following steps: S1, preparing graphene dispersion liquid; s2, taking the graphene dispersion liquid prepared in S1 as a raw material, and mixing cement and an additive to prepare a graphene cement-based grouting material; s3, grouting holes are formed in the to-be-grouted area of the tunnel, drilling operation is conducted, and grouting pipes matched with the grouting holes in size are installed; s4, a grouting pipeline is subjected to sealing detection, and the graphene cement-based grouting material prepared in the S2 is injected into a grouting hole through the grouting pipeline; and S5, the grouting process is monitored, the grouting quality is verified through a preset detection method after grouting is completed, and grouting is completed if preset requirements are met. According to the construction method, the graphene nanomaterial is innovatively applied to the field of traditional tunnel grouting, and the grouting process is improved. The method is mainly applied to the aspect of graphene cement-based material tunnel grouting.