11results about How to "Guaranteed early strength" patented technology

The invention discloses a synchronous grouting method for a double-shield TBM (tunnel boring machine) and a shield tail structure thereof, an annular cavity is formed between an annular duct piece and surrounding rock, the grouting method comprises the following steps: along with tunneling of the double-shield TBM, rapid hardening slurry is poured into the lower area of the annular cavity from a grouting hole in a bottom duct piece; after the rapid-hardening slurry is solidified, the upper area of the annular cavity is filled with pea gravels in a blowing mode from a grouting hole in the top segment; after hydraulic reclamation of the pea gravels is completed, cement paste is poured into a gap between the upper area of the annular cavity and the pea gravels from a grouting hole in the top segment, and the pea gravels and the cement paste are mixed to form a grouting body; by means of the grouting method, grout can be filled in time before the duct piece is separated from the shield tail, and the early strength is guaranteed.

The application discloses a solid waste-based cementing material and a preparation method and application thereof, and belongs to the technical field of building materials. After grading pretreatment of industrial by-product gypsums of different sources, the industrial by-product gypsums are dry-mixed with active mineral admixtures, heavy metal stabilization components and sulfate activators, water is added for first-stage hydration and standing, the sulfate activation is preferentially caused to form ettringite and dihydrate gypsum crystal framework, and then silicate activators are added for second-stage hydration to generate C-(A)-S-H gel, so that the ordered generation of hydration products is realized. Through step-by-step cooperative activation, the early compressive strength is increased by 30%-50% compared with one-time addition of activators, the 28d softening coefficient can reach more than 0.76, meanwhile, the heavy metal ion leaching concentration is reduced by more than 80%, the quality standard requirement of underground water is met, and through the design of special pretreatment processes for desulfurization gypsum, phosphogypsum, fluorogypsum and citric acid gypsum respectively, the same set of modifier composition can adapt to various gypsum sources, and the quality stability is greatly improved.

The application relates to the technical field of cement materials, and particularly discloses a high ore fused stone ferrite aluminate cement material and a preparation method thereof. The cement material is prepared by jointly grinding and treating high belite ferrite aluminate cement clinker and a modifier. The modifier is composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate is HOOC-CH2-CH2-CO(PO3H2). The modifier composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source is used to perform mechanochemical coupling modification on the belite ferrite aluminate cement clinker, multi-level interface interaction occurs under the induction of mechanical force, directional poisoning and growth inhibition of calcium aluminate crystal nuclei are realized, the early strength of the cement is maintained, and the volume stability of the cement material is significantly improved.

The invention discloses an early strength agent for large-temperature-difference well cementation cement slurry and a preparation method of the early strength agent. The early strength agent comprises the following components in parts by weight: 40-60 parts of nano quartz powder; 32 to 45 parts of nano calcined kaolin; 5-10 parts of a dispersant; and 3-5 parts of a silane coupling agent. When the early strength agent is prepared, the dispersing agent and the silane coupling agent are adopted to perform surface modification on the nano quartz powder and the nano calcined kaolin, so that the problem of slow strength development of large-temperature-difference well cementation cement paste in a low-temperature region section is solved, the well cementation quality of a long cementation section is guaranteed, and efficient and safe exploitation of deep oil and gas resources is guaranteed.

The application relates to the technical field of concrete pavements, and discloses a reinforced material for concrete pavements and a use method thereof. The reinforced material comprises dry materials and wet materials. The dry materials are as follows: 200-400 parts of white cement clinker, 70-120 parts of modified mineral powder, 300-700 parts of tailing sand, 50-140 parts of lithium slag powder and 5-50 parts of pigment. The wet materials comprise component 1 and component 2. The component 1 is composed of 10-30 parts of nano silicon oxide sol, 10-20 parts of polyaluminum, 10-30 parts of sodium silicate, 5-20 parts of aluminum sulfate, 5-10 parts of urea and 100-300 parts of water. The component 2 is composed of 5-10 parts of glue powder, 5-10 parts of 3-aminopropyltrimethoxysilane and 80-90 parts of water. The dry materials are sprayed on the surface of the concrete by a spraying machine or are uniformly vibrated on the surface of the concrete by a vibrating screen, and the wet materials are sprayed on the surface of the concrete by a sprayer, and then are collected and smoothed, so that the problems of low strength, easy falling and alkali return of the traditional reinforced material are solved.

The invention relates to green low-carbon cement and a preparation method thereof. Relates to the technical field of building materials. On the premise of ensuring the performance, the process is further simplified, and a more accurate clinker dosage range can be provided for a specific application scene. Comprising silicate clinker, a composite admixture and gypsum, and further comprises an induced hardening and tempering component, and the induction hardening and tempering component is sulphoaluminate cement or waste cement paste micro powder. According to the invention, the measure of an inducer is innovatively put forward, the sulphoaluminate cement is rapidly hydrated at an early stage, or waste cement paste micro powder hydrated calcium silicate is used as a seed crystal to induce and accelerate hydration, so that the improvement of early activity is realized; meanwhile, based on a particle size grading theory, the specific surface area of the components is regulated and controlled, and early and later performances are synergistically exerted. On the basis of gradient control of the clinker mixing amount and adjustment of the gypsum consumption, the particle size grading of the auxiliary cementing material is adjusted, and the inducer is added, so that the early and later coordinated performance of the low-clinker system is realized. The method has remarkable social and economic benefits, and resource waste is avoided.

The invention relates to the technical field of cement materials, and particularly discloses a high-ore-melting-stone iron aluminate cement material and a preparation method thereof. The cement material is prepared by grinding high belite sulfur iron aluminate cement clinker and a modifier together. The modifier is composed of succinyl phosphonate, quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate ester is HOOC-CH2-CH2-CO (PO3H2). According to the invention, a modifier composed of succinyl phosphonate, quaternary ammonium salt and an aluminum source is used for carrying out mechanochemical coupling modification on belite pyrite aluminate cement clinker, and multi-level interface interaction occurs under the induction of mechanical force, so that directional poisoning and growth inhibition of ettringite crystal nucleus are realized; and the volume stability of the cement material is remarkably improved while the early strength of the cement is maintained.

The invention relates to the technical field of oil and gas well cementation, in particular to a geopolymer activator, and aims to solve the problem of insufficient adjustability of thickening time of fly ash geopolymers excited by reactive excitants such as sodium carbonate and calcium hydroxide due to too high dissolution rate of calcium hydroxide. The geopolymer activator provided by the invention comprises the following components in parts by weight: 10-12 parts of high-temperature burnt calcium oxide; 10 to 12 parts of medium-temperature burnt calcium oxide; 9-11 parts of low-temperature burnt calcium oxide; 40 to 60 parts of sodium carbonate; and 5-31 parts of sodium sulfate. The geopolymer activator has the advantages that the release rate is low, and the thickening time of the geopolymer prepared from the geopolymer activator is easy to regulate and control, and can well meet the operation construction of oil and gas well cementing.

The application discloses an emulsifier type cold-mixed and cold-paved asphalt mixture and a preparation method thereof, wherein the emulsifier type cold-mixed and cold-paved asphalt mixture comprises coarse aggregate 400-600 parts by mass, fine aggregate 400-600 parts by mass, modified emulsified asphalt 90-160 parts by mass, mineral filler 10-30 parts by mass and water-reactive resin demulsifier 2-8 parts by mass; wherein the water-reactive resin demulsifier has a molecular weight of 1-10 million. The emulsifier type cold-mixed and cold-paved asphalt mixture speeds up the early strength formation of the asphalt mixture without using cement and guaranteeing the road performance, and solves the technical problem of difficult recycling of the pavement paved by the asphalt mixture added with cement in the prior art, so as to overcome the shortcomings in the prior art.

The present invention relates to cement and its manufacturing field, specifically discloses a low-heat high-grade cement and a preparation method thereof, wherein the low-heat high-grade cement is obtained by mixing low-heat high-grade cement clinker with gypsum, admixture, and granulated blast furnace slag; the raw material ratio of low-heat high-grade cement clinker is by weight percentage: 75-86wt% of lime, 3-6wt% of tailings waste, 10-16wt% of clastic rock, and 1-3wt% of yellow phosphorus slag; the admixture is a mixture of polyacrylic acid and polytetrafluoroethylene. By adding polytetrafluoroethylene to polyacrylic acid, the hydration heat inhibition effect of polyacrylic acid is significantly improved, and yellow phosphorus slag and granulated blast furnace slag are added at the same time, the early strength of cement is also improved, and the synergistic effect of early strength and low hydration heat of low-heat high-grade cement is achieved.

The invention provides a rolling-free self-compacting ardealite base road construction method, and belongs to the field of road construction. According to the construction technology, the characteristics of phosphogypsum components are combined, mineral powder is selected as a main active cementing material, cement is selected as an alkali activator, a small amount of phosphogypsum is selected as a sulfate activator, a composite modified cementing material is formed, the mass ratio of phosphogypsum to broken stone to machine-made sand to cement to slag to water to an additive is controlled to be 21.03: 17.52: 4.30: 1.0: 2.73: 6.97: 0.14, all the components are subjected to forced centrifugal mixing, and the composite modified cementing material is prepared. The ardealite base material which is in a flow plastic state, is fully hydrated, is uniform and compact and is applied to a base road, the result shows that the technology has the characteristics of reliable performance, simple process and relatively good economical efficiency, the effects of quickly consuming the ardealite and reducing the stock stacking pressure are achieved, the effects of resource utilization and turning waste into treasure are achieved, and the ardealite base material can be applied to a base road. And the method has remarkable economic benefits and social benefits, and can be popularized and applied to road bases of municipal and highway engineering.