44results about How to "Reduced compressive strength" patented technology

The invention belongs to the technical field of tunnel construction, and discloses SAP geopolymer sprayed concrete and application thereof in primary lining of a high-ground-temperature tunnel. The concrete is prepared from the following raw materials in parts by mass: 100 parts of a cementing material, 13-16 parts of an alkali activator, 135-150 parts of river sand, 165-185 parts of stones, 32-41 parts of water and a proper amount of SAP, in percentage by mass, the use amount of the SAP is 0.2-0.3% of the binding material; the cementing material is composed of slag and fly ash according to a mass ratio of (0.24-0.26): 1. The SAP geopolymer sprayed concrete is applied to primary lining of a high-ground-temperature tunnel. The SAP geopolymer shotcrete not only has high strength and high toughness of traditional shotcrete, but also has good heat insulation and heat resistance, has supporting and heat insulation performance, realizes environment-friendly and pollution-free construction, and is particularly suitable for high-ground-temperature tunnels and the like.

The invention discloses an enhanced gas extraction system for a double-pulsation acid fracturing anti-reflection low-permeability coal seam. The enhanced gas extraction system comprises a pressure overshoot protection mechanism, a fracturing fluid conveying line, a gas extraction line, a liquid mixing box, a pressure adjusting and monitoring mechanism and a frequency adjusting and monitoring mechanism. The invention further discloses a double-pulsation acid fracturing anti-reflection low-permeability coal seam enhanced gas extraction method which comprises the following steps that S1, a target coal seam is investigated and researched, and fracturing fluid is obtained; s2, the system is installed; s3, the fracturing pressure and the pulsation frequency of the fracturing fluid are adjusted, and continuous periodic circulating fracturing is conducted on the fracturing drill hole; s4, the fracturing pressure and the pulsation frequency of the fracturing fluid are adjusted, and continuous periodic circulating fracturing is conducted on the fracturing drill hole; s5, the steps S3-S4 are repeated for five times, and the gas concentration is subjected to extraction detection to generate data. The method has the advantages that the connectivity of the fracture-pore structure in the coal body is improved, the coal seam permeation enhancing effect is improved, the coal seam gas extraction efficiency is improved, and the structures are linked with one another.

The invention provides tundish stuffing sand and a preparation method thereof, and belongs to the technical field of steelmaking continuous casting. The invention relates to tundish drainage sand, which is prepared from the following components in parts by weight: 40 to 60 parts of magnesite sand, 15 to 35 parts of dolomite sand, 10 to 30 parts of raw perlite, 5 to 15 parts of kyanite, 10 to 30 parts of rare earth mineral powder and a binder. The weight part of the rare earth mineral powder is 2-5, and the weight part of the binder is 1-3. The tundish stuffing sand is suitable for a stopper-free flow control pouring method, the automatic pouring rate is increased, and molten steel pollution is reduced.

The invention relates to the technical field of high-temperature heat storage, in particular to a foundation structure for supporting a high-temperature fused salt storage tank. The foundation structure comprises a concrete foundation layer, a ceramsite layer, a foam glass layer, a calcium silicate layer and a sand cushion layer which are sequentially stacked upwards from the ground. The sand cushion layer is used for making contact with the tank bottom of the high-temperature fused salt storage tank, receiving heat from the tank bottom of the high-temperature fused salt storage tank and conducting the heat downwards. The calcium silicate layer can keep the temperature of the foam glass layer to be lower than the temperature-resistant upper limit value when receiving heat transferred from the sand cushion layer. According to the foundation structure, the heat loss of the foundation structure in the ground direction can be reduced while the cost is not obviously increased, meanwhile, differential settlement is avoided, and the foundation structure is suitable for molten salt materials with the use temperature reaching 650 DEG C or above.

The invention discloses concrete and a production method thereof. The concrete is prepared from the following raw materials in parts by weight: 100 to 120 parts of cement, 130 to 145 parts of coarse aggregate, 120 to 135 parts of fine aggregate, 10 to 25 parts of fly ash, 20 to 35 parts of slag powder, 25 to 38 parts of hydrogel composite fiber, 8 to 15 parts of borax, 6 to 11 parts of calcium stearate, 2 to 3 parts of polycarboxylate superplasticizer, 30 to 40 parts of modified emulsified asphalt and 50 to 65 parts of water. Wherein the hydrogel composite fiber is prepared from expanded perlite micro powder, polyurethane, polyacrylic acid and a hydrogel polymer through spinning. The concrete provided by the invention has good permeability resistance, compressive strength and toughness, and also has good freeze thawing resistance; the production method is simple, easy to operate and convenient to construct.

The invention relates to the technical field of soil remediation, and particularly discloses an adsorption material, a preparation method thereof and a method for removing heavy metal cadmium in a paddy field, and the preparation method comprises the following steps: (1) treating hollow glass beads with an alkali solution for later use; (2) adding sodium alginate into pure water, and stirring to obtain a sodium alginate solution with the mass fraction of 1-2.5%; and (3) adding the hollow glass beads treated in the step (1) into a sodium alginate solution, uniformly stirring to obtain a hollow glass bead-sodium alginate solution, then sucking the hollow glass bead-sodium alginate solution by using an injector, dropwise adding the hollow glass bead-sodium alginate solution into a 0.1-0.5 mol / L calcium chloride solution, standing for 12-24 hours, filtering, washing and freeze-drying to obtain the adsorption material. The heavy metal cadmium in the rice soil can be effectively removed, secondary pollution cannot be caused, and the adsorption material is beneficial to recycling.

The invention relates to the technical field of tunnel excavation, and discloses a cutting heading machine and a construction method thereof.The cutting heading machine comprises a drilling assembly, a hinge assembly and a supporting assembly, the drilling assembly is used for scraping a tunnel working face, the supporting assembly is used for supporting a tunnel rock face, and the hinge assembly is connected between the drilling assembly and the supporting assembly and used for driving the drilling assembly to steer; the hinging assembly comprises a steering shell at the front end, a fixing shell at the rear end, a steering ring and at least one driving piece, the steering shell is connected to the rear end of the tunneling assembly, the fixing shell is fixedly connected to the supporting assembly, and the steering ring is hinged to the steering shell and the fixing shell through the driving piece so as to drive the steering shell to deflect relative to the fixing shell; the steering device has the advantages that the structure is simple, and the steering ring meets the effects of driving rotation and bearing rear-end driving at the same time.

The invention discloses a preparation method of silicon dioxide composite thermal insulation aerogel. According to the invention, o-phthalaldehyde is used as a cross-linking agent to prepare the silicon dioxide composite thermal insulation aerogel with thermal insulation function, high skeleton strength and good adsorption capacity, and on the basis, sodium lauroyl glutamate is used as an air template to prepare the new silicon dioxide composite thermal insulation aerogel. On the premise that the whole gelation process is not damaged, the pore volume of the aerogel is increased, the separation effect in oil-water separation is further improved, the excellent flame-retardant capability is shown, and finally, the flame-retardant aerogel can be used for preparing oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation oil-water separation. Chitosan is selected to be subjected to quaternization modification and then is directly compounded with hydrophobized silicon dioxide aerogel powder to obtain the improved silicon dioxide composite heat preservation type aerogel, the improved silicon dioxide composite heat preservation type aerogel not only has a more complex and slender framework structure, but also increases the overall surface area and surface roughness of the gel, and the adsorption capacity of the aerogel is further enhanced.

The invention discloses an intrinsically-safe crushing device and method for recycled waste ladder black powder blocks. The intrinsically-safe crushing device comprises a rotary heating and melting unit, a leveling, thinning and cooling unit and a conductive rubber extruding and crushing unit. An outlet of the rotary heating and melting unit communicates with an inlet of the leveling, thinning and cooling unit, the conductive rubber extruding and crushing unit is located over an outlet of the leveling, thinning and cooling unit, and the device and method can achieve safe crushing of the black powder blocks.

This invention provides a sandwiched pressure hull structure and its processing method, relating to an underwater vehicle structure, including an inner hull, an outer hull, and an intermediate sandwich layer located between the inner and outer hulls. The intermediate sandwich layer includes hollow glass microspheres, reinforcing fibers, and epoxy resin. The spherical hollow glass microspheres and reinforcing fibers are uniformly mixed in the epoxy resin and placed in a fluidized state between the inner and outer hulls. After vacuum curing, they form a buoyancy material located between the inner and outer hulls. This invention addresses the problems of insufficient load-bearing capacity and low specific strength and specific stiffness of the pressure hulls of underwater vehicles in the prior art.

The present invention provides a bone filling material and a preparation method and application thereof, belonging to the technical field of medical materials for repairing bone defects. The bone filling material includes a powder and a liquid, and the amount of the powder added in the unit volume of the liquid is 1.5-2.5g; wherein, by mass percentage, the powder includes: a composite material 10-89.99%, a first acrylic polymer 0-59.5%, a developer 10-50%, and benzoyl peroxide 0.01-3%; by mass percentage, the liquid includes: a first acrylic monomer 94.5-99.98%, N, N-dimethyl-p-toluidine 0.01-5%, and an inhibitor 0.01-0.5%; the above-mentioned composite is a copolymer or blend formed by a second acrylic polymer and a siloxane compound, or a copolymer or blend formed by a second acrylic polymer, a siloxane compound and methacrylate silane.

The invention discloses a construction method for removing bracket concrete through high-pressure water jet. The construction method comprises the following steps that S1, construction preparation is made; s2, completing installation and construction of the high-pressure water jet system; s3, parameters of the high-pressure water jet system are set; s4, starting to carry out experimental breaking; and S5, starting formal breaking. The concrete is of a microporous structure, the ultimate strength of the concrete is far smaller than the compressive strength of the concrete when the concrete bears tensile stress, the reinforcing steel bars have the characteristics of high tensile strength, dense surfaces of the reinforcing steel bars, no micropores and incapability of drilling in high-pressure water, so that high-pressure water flow is injected into the surface of the concrete, and when the high-pressure water flow penetrates through concrete pores, internal pressure is generated; when the internal pressure exceeds the tensile resistance of the concrete, the concrete is broken and separated, and the internal reinforcing steel bars are not damaged, so that the aims of protecting the reinforcing steel bars from being damaged due to the removal of the concrete and completely removing the concrete are fulfilled, and the construction quality is effectively ensured.

The invention discloses a thin-wall honeycomb ceramic with thermal shock resistance and mechanical property and a preparation method thereof. The thin-wall honeycomb ceramic comprises basic powder and a composite additive, the composite additive comprises vanadium pentoxide and neodymium oxide, wherein the addition amount of the vanadium pentoxide is 2-4wt% of that of the basic powder, and the addition amount of the neodymium oxide is 1-9wt% of that of the basic powder. The thermal expansion coefficient of the ceramic is reduced by adding vanadium pentoxide, and the sintering compactness of the ceramic is improved by combining neodymium oxide, so that the thin-wall high-strength honeycomb ceramic is obtained. The 2 wt%-4 wt% of vanadium pentoxide and 1 wt%-9 wt% of neodymium oxide interact with each other to achieve synergistic interaction, so that the low expansion coefficient is achieved. And the prepared sample is relatively small in deformation degree and relatively low in thermal expansion coefficient.

The utility model discloses a shell assembly machining punching device which comprises a bottom plate, a T-shaped support is fixedly connected to the middle of the rear side of the bottom plate, an embedding seat is fixedly embedded in the top end of the rear side of the T-shaped support, a discharging hole is formed in the middle front side of the top of the embedding seat, a material collecting groove is formed in the center of the front side of the embedding seat, and a punching hole is formed in the middle of the embedding seat. A rectangular shell is arranged on the outer side of the front end of the embedding base in a front-back sliding fit mode, electric push rods are fixedly connected to the rear portions of the left side and the right side of the embedding base, push plates are fixedly connected to the output ends of the front sides of the electric push rods, and the front sides of the push plates are attached to the rectangular shell in an extrusion mode. The top face of the embedded base can be attached to and assist in supporting the stamping part of the rectangular shell, horizontal stability of the stamping periphery of the rectangular shell is kept, the sinking problem is avoided, meanwhile, the rectangular shell can be supported upwards, the compressive strength of the two sides of the rectangular shell is reduced, and the bending deformation problem is avoided.

The invention provides a filter for a urinal and a manufacturing method thereof. The filter is prepared from the following materials in parts by weight: 15 to 23 parts of bisphenol A epoxy resin, 50 to 57 parts of waste ceramic powder, 20 to 25 parts of glass fiber, 1 to 3 parts of low shrinkage agent, 0.2 to 0.4 part of curing agent, 0.8 to 1.1 parts of initiator and 1 to 2.5 parts of inorganic composite bactericide. The low shrinkage agent is modified polyurethane or polyvinyl chloride; the inorganic composite bactericide is prepared from the following components in parts by weight: 31 to 35 parts of quartz, 14 to 18 parts of aluminum oxide, 17 to 22 parts of thorium dioxide, 7 to 12 parts of tourmaline, 5 to 8 parts of samarium oxide, 7 to 9 parts of thulium oxide and 8 to 12 parts of zinc oxide. The filter for the urinal is good in sterilization effect, resistant to falling and convenient to clean and replace.

The invention relates to the field of wood functional materials, and discloses super-hydrophobic wood, a preparation method thereof and composite suspension liquid. The composite suspension comprises the following components: nano-hydroxyapatite, polydimethylsiloxane, ethyl acetate and a curing agent. The preparation method of the super-hydrophobic wood comprises the following steps: carrying out alkali etching treatment on the wood; and the composite suspension liquid is sprayed on the surface of wood, and the super-hydrophobic wood is obtained after curing. The prepared super-hydrophobic wood has excellent water repellency, the water contact angle of the super-hydrophobic wood can reach 153.3 degrees, meanwhile, the rolling angle is small and is only 4.3 degrees, and the super-hydrophobic wood is suitable for being applied to wood in the outdoor environment. After the coating is exposed outdoors for 60 days, the water contact angle can still be kept at 152.5 degrees, and the rolling angle is about 6.1 degrees, so that the coating is proved to have good weather resistance. And after multiple wear repair cycles, the water contact angle can still be recovered to 142 degrees, and the repair rate is as high as 92.4%.

The utility model belongs to mechanical or structure part static balance test technical field, concretely relates to airtightness detection mechanism for membrane electrode and airtight integrated machine using it, include: hydraulic drive position, detection position, pull rod guide pillar, pressure head traction plate, main hydraulic cylinder, upper pressure head, lower pressure plate seat, lower pressure plate, track assembly, pressure head traction plate swing joint in pull rod guide pillar, upper pressure head is connected in the downside of pressure head traction plate. The utility model through setting in pressure head traction plate, will main hydraulic cylinder and upper pressure head change into indirect connection, will lower pressure plate and multiple lower pressure plate seat contact fit, and track assembly sets up between two lower pressure plate seats, can maximize increase lower pressure plate and lower pressure plate seat contact area, reduce the pressure intensity of lower pressure plate bottom, make it can adapt 5Mpa's high pressure airtightness test, through the way of upper pressure head and lower pressure plate cover pressure to membrane electrode fixed, through blowing gas and detecting air flow fluctuation to judge whether there is gas leakage and then acquire airtightness.

The utility model discloses a precast concrete anti-seismic frame structure, and relates to the technical field of constructional engineering. Comprising a frame body and a supporting column, a plurality of top connecting assemblies are arranged at the bottom end of the frame body, a plurality of bottom connecting assemblies are arranged at the top end of the supporting column, and the bottom connecting assemblies and the top connecting assemblies are equal in number and are in one-to-one correspondence; connection between the frame body and the supporting columns is achieved through mutual cooperation of the bottom connecting assemblies and the top connecting assemblies. According to the anti-seismic frame structure, the top connecting assembly and the bottom connecting assembly are arranged, when large vibration exists outside, the vibration possibly enables concrete at the connecting position to crack or peel off, when the frame body and the inserting shaft move downwards, vertical vibration can be buffered through spring deformation, and therefore the anti-seismic performance of the frame structure is achieved.

Head-mounted tool for adjusting face muscle position is provided. The Head-mounted tool includes a head-mounted tool body (1), one or more traction strips (2) having one end connected to the head-mounted tool body (1), and an adhesive surface (3) connected to the other end of the traction strips (2) and attached to the face muscle. The head-mounted tool body (1) includes a headband (101) for wearing the head-mounted tool on a head of a human body. The head-mounted tool overcomes the defects in the prior art that repositioning of the face muscle is not flexible, the firmness of the positioning is not high enough during a sitting posture, a lying posture, or different posture change, the comfort is low, or the like. The head-mounted tool can quickly pre-position a youthful position of the face muscle before the simple and convenient beauty technique, thereby meeting people's increasing needs for beauty.

The present invention provides an auxiliary cementitious material with high-efficiency carbon fixation based on electrostatic adsorption, and a preparation method and application thereof. The preparation method of the present invention comprises the steps of: placing ultrafine carbide slag powder in an electrostatic field to make it carry electrostatic charge, and obtaining ultrafine carbide slag powder with electrostatic charge; uniformly mixing low-calcium fly ash and ultrafine carbide slag powder with electrostatic charge, and adding them to a rotating packed bed; continuously introducing industrial waste gas containing carbon dioxide and water vapor into the rotating packed bed; after the reaction, collecting the material and drying it. The method of the present invention has cheap and easy-to-obtain raw materials, high efficiency and low energy consumption; it can permanently seal carbon dioxide in industrial waste gas, and the carbon dioxide sealing amount and sealing efficiency are high; and it fully realizes the resource recycling of waste materials such as fly ash. The obtained auxiliary cementitious material and the cementitious system prepared by compounding with cement have higher strength and faster setting time, and are expected to replace more cement clinker to prepare low-carbon composite cement.

The utility model relates to the technical field of shock absorption and noise reduction mechanisms, in particular to an excavator with a shock absorption and noise reduction mechanism, a cab shell is mounted on the rear side of the upper portion of an excavator body, a base is mounted in the middle of the upper portion of the excavator body, a shock absorption damping rod is hinged to the upper portion of the base, and a movable seat is hinged to the upper portion of the shock absorption damping rod. A rubber sleeve is mounted on the lower side of the periphery of the movable seat; the excavator has the beneficial effects that when an excavator body works, vibration can be transmitted to a cab, the vibration is transmitted to the damping rods through the base, the vibration amplitude and frequency are preliminarily weakened through stretching and retracting of the multiple sets of damping rods, and the rubber sleeves protect the internal damping rods against external influences; the movable seat and the connecting seat are connected through the air bag, the air bag can well absorb vibration, the spring rod limits the movement range of the connecting seat under the influence of vibration, and when the connecting seat collides with the movable seat under the influence of vibration, the rubber pad can effectively absorb vibration and reduce noise.

A super-durable double-liquid grouting material belongs to the technical field of grouting filling materials, and is composed of components A and B; component A is composed of sodium water glass solution, ultrafine zinc phosphate, ferrosilicon powder, zinc oxide powder, oxalate powder, sodium lignin sulfonate, polyether-siloxane copolymer, and deionized water; component B is composed of cement, sepiolite-loaded curing agent, aluminum dihydrogen phosphate, polyhydroxy reinforcing agent, polyether-siloxane copolymer, and deionized water; the super-durable double-liquid grouting material obtained by the invention has a fluidity of 8-10s, a setting time of 30-37min for initial setting, 48-55min for final setting, a compressive strength of 18.9-20.8MPa at 3d, 22.7-24.6MPa at 7d, 25.1-27.0MPa at 28d, 24.3-26.2MPa at 365d, and a 10-time freeze-thaw expansion rate of 0.1-0.2%.

The present application relates to the technical field of laser rock breaking, and discloses a surface laser-induced cracking auxiliary rock breaking device, which comprises a laser operation trolley, a laser emitter is arranged on the laser operation trolley, a six-axis robot is arranged on the laser operation trolley, an execution end of the six-axis robot is provided with a surface laser cladding head, an optical fiber input line is arranged in the surface laser cladding head, a plurality of laser grooves are formed in the surface laser cladding head, a laser emission port is arranged in the laser groove, the laser emission port is connected with the optical fiber input line through a line, a collimating mirror and a focusing mirror are sequentially arranged in the laser groove along the axial direction of the surface laser cladding head, and the focusing mirror moves along the axial direction of the laser groove to change the focusing focal length. The rock is rapidly heated by laser to generate cracks, and the rock breaking efficiency of the post-period drilling and blasting method and mechanical method is improved; meanwhile, the focusing intensity of the laser is adjustable, so that the rock is broken by focusing appropriate laser intensity, and the expected rock breaking effect is achieved.

The utility model relates to the technical field of conveying belt structures, and discloses a conveying belt structure for a plate turnover machine, which comprises a conveying belt group and a bottom plate, the conveying belt group is assembled at the top of the bottom plate, corrugated grooves are uniformly formed in the outer part of the conveying belt, supports are uniformly distributed at the top of the bottom plate, and the corrugated grooves are formed in the bottom plate. Clamping mechanisms are welded to the two sides of the top of the support, each clamping mechanism comprises a clamping block, the clamping blocks are connected with the support, and vertical blocks are slidably connected into the clamping blocks. According to the conveying belt structure for the plate turnover machine, through cooperation of the clamping grooves, the sliding grooves, the clamping blocks, the vertical blocks, the springs, the connecting rods and the clamping arms which are additionally arranged, the supporting arms and the supports can be rapidly connected in a clamped mode, the clamping stability of the clamping mechanisms and the clamping grooves is improved through pressure borne by the tops of the supporting arms, and then the situation that the supports and the supporting arms are disconnected is avoided; under the condition that the bracket and the supporting arm are convenient to disassemble, the overall stability of the device is greatly improved.

The invention discloses a shockproof damping structure of an industrial building and a shockproof control method. A shockproof damping node of the shockproof damping structure is composed of a stand column, a cross beam, a plate spring and a viscous damper. The stand column comprises a hollow concrete square column and a square steel column located in the hollow concrete square column, and a plurality of through square holes are formed in the hollow concrete square column. Inclined planes are arranged on four planes at the lower part of the square steel column, and four wedge-shaped hanging blocks are hung at the upper part of the square steel column through steel wire ropes. And the cross beam is supported in the square hole and is elastically connected with the square steel column through the plate spring. The viscous damper is obliquely hinged between the cross beam and the square steel column and is provided with a demagnetizing device and a magnetizing device, and the viscous characteristic of the viscous damper can be changed. Compared with the prior art, the viscous damper has good damping performance, the viscous damper can have the viscous characteristic matched with the seismic intensity grade before seismic transverse waves arrive, the destructive effect of an earthquake is pointedly handled, the damage degree is reduced to the minimum, and the purposes that the viscous damper does not fall down in a large earthquake, can be repaired in a medium earthquake and does not damage in a small earthquake are truly achieved.

The application discloses a jaw crusher for producing fire-resistant raw materials and relates to the technical field of crushers, which comprises a jaw crusher body, a fixed jaw plate and a movable jaw plate oppositely arranged in the jaw crusher body, a feeding hopper fixedly installed at the top of the jaw crusher body, a pre-crushing assembly arranged between the fixed jaw plate and the movable jaw plate, a driving rod capable of driving a reciprocating wire tube to synchronously rotate, a separation extrusion piece capable of pushing ore to both sides, small ore blocks falling from the gaps of large ore blocks, the fixed jaw plate and the movable jaw plate crushing the ore blocks, the driving rod sequentially meshing the second bevel gear, the third bevel gear and the fourth bevel gear to rotate the second bevel gear, the third bevel gear and the fourth bevel gear, the crushing roller rotating, the separation extrusion piece pushing and extruding, the large ore blocks being crushed in multiple directions and being pre-crushed into small ore blocks, the number of extrusion times being reduced, the abrasion of the jaw plate being reduced, the service life of the jaw plate being prolonged, and the crushing efficiency being improved.

The invention discloses a jaw crusher for producing refractory raw materials, and relates to the technical field of crushers, the jaw crusher comprises a jaw crusher main body, a fixed jaw plate and a movable jaw plate are oppositely arranged in the jaw crusher main body, a feed hopper is fixedly mounted at the top of the jaw crusher main body, and a pre-crushing assembly is arranged between the fixed jaw plate and the movable jaw plate; a reciprocating screw pipe can be driven to rotate synchronously through a driving rod, so that separation extrusion piece ores are pushed to the two sides, small ores fall down from gaps of large ores conveniently and are crushed by a fixed jaw plate and a movable jaw plate, and meanwhile, the driving rod is sequentially meshed with a first bevel gear to drive a second bevel gear, a third bevel gear and a fourth bevel gear to rotate through a first bevel gear; and by matching with pushing and extruding of the separating and extruding pieces, large ores can be subjected to crushing force in multiple directions at the same time and are pre-crushed into small ores, the extruding frequency needed by crushing is reduced, abrasion to the jaw plate is reduced, the service life of the jaw plate is prolonged, and the crushing efficiency is improved.

This invention describes a modified silicate-polyurethane two-component grouting reinforcement material, comprising component A and component B, which are mixed in a 1:1 volume ratio before use. Component A, by mass percentage, consists of the following components: water glass: 94%; glycerol: 1%; glyceryl ester compounds: 1%; silane coupling agent: 1%; water: 3%. Component B, by mass percentage, consists of the following components: polymethylene polyphenyl polyisocyanate PM-200: 65%; dibutyl phthalate (DBP): 35%. This invention utilizes the synergistic effect of glyceryl ester compounds and silane coupling agents. The glyceryl ester compounds reduce the interfacial tension between the aqueous and oil phases and promote the uniform dispersion of the silane coupling agent. The silane coupling agent forms a chemical bridge between the inorganic and organic phases, enabling the originally incompatible aqueous and oily agents to form a homogeneous and compatible system. The resulting solidified body has a compressive strength of 24.6 MPa and a bond strength of 3.8 MPa, making it suitable for seepage prevention and sealing in underground engineering and for surrounding rock reinforcement.

The application belongs to the field of road engineering and discloses a composite high-performance cement-based grouting material for local disease repair excited by carbamate, which is characterized in that the adding amount of each component is as follows in terms of weight fraction: cement 45-50 parts; water 20-25 parts; composite polyurethane 2.0-2.5 parts; nano-silica ash 0.9-1.0 parts; fine sand 2.3-2.5 parts; water reducing agent 0.2-0.25 parts; and defoaming agent 0.2-0.25 parts. The application also discloses a preparation method. The application has the following main beneficial effects: the hydration reaction and hydration speed are improved, and the formation of early strength is promoted; the strength and interfacial bonding strength after hardening, the toughness and stability of the grouting material are improved, the bubble content in the grouting material is reduced, the brittle fracture of the road surface is effectively reduced, the cement mortar breaking strength is increased, the mixing is carried out at normal temperature, the required energy consumption is low, no waste gas is discharged, the strength after hardening is high, and the adaptability is good.

This invention provides a mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand and its preparation method, belonging to the field of building materials. The mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand provided by this invention comprises the following components in parts by weight: 6-13 parts iron tailings powder, 9-20 parts slag powder, 0.5-1 part desulfurization ash, 20-38 parts ultra-fine iron tailings sand, 10-28 parts steel slag sand, 0.6-1.4 parts activator, and 25-41 parts water. The mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand provided by this invention has a 120-day shrinkage rate as low as 2.12% and a 28-day compressive strength as high as 7.68 MPa, exhibiting low shrinkage and high compressive strength.