660 results about "Cement paste" patented technology

The invention provides an artificial intelligence concrete strength prediction method based on multi-scale morphological feature analysis, and the method combines multi-scale morphological feature analysis including surface texture and internal pore structure, and utilizes a deep learning algorithm to accurately predict concrete interface strength. The method comprises the following steps: simulating a pore filling rate and microcrack propagation resistance of an interface area by combining multi-scale concrete morphology information to obtain performance parameters of an interface transition area; calculating the deviation between the predicted strength and the actual strength to obtain a prediction precision index, and if the prediction precision index does not reach a preset threshold value, updating the strength prediction model parameters to obtain an updated strength prediction model; and calculating a strength prediction result according to the quantitative morphology feature vectors, the microcrack propagation path parameters and the cement paste hydration degree of various concrete material systems to obtain strength prediction precision. The method not only improves the accuracy of traditional strength evaluation, but also provides a scientific basis for optimizing the concrete proportion design.

The invention relates to a deep coal underground gasification method which comprises the following steps: drilling a plurality of gasification wells in a land parcel, sequentially arranging the plurality of gasification wells into three rows from the edge of the land parcel, and fracturing a bottommost coal seam; the first row of gasification wells are injection wells, the second row of gasification wells are production wells, and the bottommost coal seam between the first row of gasification wells and the second row of gasification wells is gasified; when the gasification high-temperature area of the gasified coal seam is expanded to the front edge of the gas cooling area, the second gas gasification well is closed, the third gas gasification well serves as a production well, and the coal seam continues to be gasified; meanwhile, a fourth row of gasification wells are drilled; after the coal bed is gasified, the bottommost coal bed between the second row of gasification wells and the third row of gasification wells is gasified, and so on, the bottommost coal bed between all the rows of gasification wells is gasified; meanwhile, cement paste is injected into the first exhaust gasification well to fill the gasified goaf; and so on, filling the goaf between each row of gasification wells; sequentially gasifying and refilling each coal seam from bottom to top according to the method.

The invention discloses a cement-based material mixing state intelligent regulation and control auxiliary agent and a preparation method and application thereof. The auxiliary agent is composed of reversible sulfonation modified degradable starch and acrylic resin containing hydroxyl. The method is characterized in that the sulfonated modified starch plays roles in dispersing and suspending cement particles and gravels and improving uniformity and flowability in the cement-based material mixing and injection molding stages, and the sulfonated starch is stimulated to be reversibly reduced into dialdehyde starch in a cement paste alkaline environment in the curing and curing stage; the molecules are mutually crosslinked to form a three-dimensional network structure, so that the effects of dispersing, suspending, adhering and fixing cement particles and gravels are achieved. Therefore, the prepared cement-based material mixing state intelligent regulation and control auxiliary agent has the intelligent effects of presenting different molecular structures and playing different roles in the stirring, injection molding and curing states, the preparation method is unique, the materials are easy to obtain, the application effect is remarkable, and the good application prospect is achieved.

The invention provides a data-driven intelligent stirring and quality prediction method, and is suitable for the field of stirring pile construction. According to the method, the data-driven neural network model is established, soil layer parameters, stirring parameters and construction quality are recognized, the state of a stirring machine is monitored in real time, the stirring process is dynamically adjusted, the comprehensive construction efficiency is improved, and the strength of a stirring pile can be predicted according to real-time data such as cement paste and the guniting amount by establishing the quality prediction model; and finally, intelligent construction is achieved, and the engineering quality and safety are improved.

The invention relates to the technical field of refractory materials, in particular to a waste magnesia-calcium brick-containing refractory material and a preparation method thereof, and the waste magnesia-calcium brick-containing refractory material comprises the following components: composite aggregate, calcium aluminate cement, urea resin-aluminum dihydrogen phosphate, active alpha-Al2O3 micro powder, silica micro powder and sodium tripolyphosphate. In the room-temperature spraying maintenance and low-temperature working stage, hydration of free CaO in the waste magnesia-calcium bricks and erosion of OH <-> are prevented through the hydrophobic effect of fluorinated polyphosphazene and modified zirconium oxide sol, and the compatibility and wettability of the composite aggregate and cement paste are improved through carboxylic acid groups of carboxyethyl silanetriol and polyethylene glycol monomethyl ether. According to the present invention, with the temperature rising, the aluminum dihydrogen phosphate forms the viscous liquid phase to wrap the aggregate so as to provide the temporary protection, the temperature continues to rise, the zirconium oxide and the nanometer Al2O3 react with the CaO and the MgO to generate the CaZrO3 and the MgAl2O3, the aluminum dihydrogen phosphate reacts with the nanometer Al2O3 in the system to generate the AlPO4, and the CaZrO3, the MgAl2O3 and the AlPO4 form the multi-phase fire-resistant structure so as to further improve the fire resistance of the fire-resistant material;

The invention discloses a method for predicting long-term creep of cement paste based on dielectric constants, which comprises the following steps of: finding out a relationship between a dielectric constant real part and a long-term creep modulus of the cement paste, firstly measuring the dielectric constant real part and the creep modulus, fitting to construct a corresponding function relational expression, verifying the constructed function expression, and finally predicting the long-term creep of the cement paste based on the dielectric constants. After the accuracy is verified, the method is applied to the long-term creep prediction of the cement paste. According to the method, the function relational expression related to the dielectric constant real part and the long-term creep modulus of the cement paste is established, the function relational expression can accurately predict the long-term creep of the cement paste, the corresponding creep modulus is obtained, and the precision of the prediction result can effectively meet the construction requirement; the whole prediction process is simple and easy to operate, the prediction precision of the long-term creep of the cement paste is greatly improved, the creep deformation of a stressed component of a building structure in a long-term stressed state can be controllably monitored, and then safe operation of an engineering structure is guaranteed.

The invention discloses a microscopic crack dynamic in-situ characterization method, and relates to the technical field of crack in-situ detection. According to the method, a plurality of hardened cement paste bodies are soaked in a sulfate solution, the porosity development trend of the hardened cement paste bodies is obtained through a nuclear magnetic resonance test and a mercury injection test in the soaking process, a test sample and a test sample are prepared after soaking is finished, and the crack propagation length of the test sample is measured through a scanning electron microscope. According to the distance gradient between the sampling angle of the test sample and the exposed surface, space coordinates of crack cracking are converted into a time process along the center axis of the test sample, a delay microscope is established on the microscale, and the test sample is scanned by using X-ray computed tomography equipment in a matched mode; a crack propagation animation image is formed based on a crack form between adjacent X-ray tomography slices, and a crack development process is obtained by continuously capturing high-resolution images, so that omission of time information is avoided, and in-situ detection of microscopic cracks in a hardened cement paste sample is realized.

The invention relates to the technical field of drilling compositions, in particular to a composite plugging agent, a plugging composition and plugging cement paste for shale gas formation cracks. The composite plugging agent for shale gas stratum cracks is composed of a bridging material, a filling material and an end-capping material, the mass ratio of the bridging material to the filling material to the end-capping material is (1.2-1.4): 0.5: (0.1-0.3), the bridging material is organic fibers with the length of 3-5 mm, the filling material is composed of inert particles with the particle size of 35-280 [mu] m and micro-silicon with the particle size of 0.15-1 [mu] m, and the end-capping material is a mixture of silicon oxide and silicon oxide. The end-capping material is composed of organic fibers with the length of 8-9 mm and walnut shells with the particle size of 3-5 mm. Through compounding of different types of bridging materials, filling materials and end sealing materials and grading of fibers with different lengths and plugging particles with different particle sizes, the plugging agent can be matched with cement paste in complex cracks and large cracks (1-4 mm) of a stratum to form a stable and compact plugging layer, the compressive strength is high, effective retention is achieved, and the effect of plugging a complex leakage layer is achieved.

The invention discloses a viscosity reduction type concrete admixture and a preparation method thereof, and belongs to the technical field of concrete admixtures. The admixture comprises a viscosity reduction type polycarboxylic acid water reducing agent, a hydrophobic surfactant, an air entraining agent, a defoaming agent, a retarder and water, wherein the viscosity reduction type polycarboxylic acid water reducing agent is prepared from a polyether monomer, unsaturated acid, a viscosity reduction functional monomer, an oxidizing agent, a reducing agent, a chain transfer agent, a neutralizing agent, a catalyst and deionized water. The viscosity reduction type polycarboxylic acid water reducer added in the admixture effectively reduces the HLB (hydrophile-lipophile balance) value of the surface of cement paste through the polymerization of phosphate groups in the viscosity reduction functional monomer, improves the flowability of concrete, and realizes the viscosity reduction effect. The mixing amount level of the admixture is 1.0-1.8%, and the admixture has the characteristics of low mixing amount, environment-friendly preparation process and excellent viscosity reduction effect, and has no negative influence on indexes such as concrete strength and the like.

The invention relates to the technical field of building materials, in particular to phase-change recycled aggregate, a preparation method thereof and an anti-freezing water-stable material. The phase-change recycled aggregate comprises a base material and a packaging layer coating the surface of the base material, the base material comprises a porous decoration waste aggregate structure and an organic phase-change material, and the organic phase-change material is located in gaps of the porous decoration waste aggregate structure; the porous decoration waste aggregate structure comprises aerated concrete aggregate; the encapsulation layer includes a first cementitious material. According to the invention, the phase-change material is used for infiltrating and filling holes in the surface of the aerated concrete aggregate, and then the cement paste is used for wrapping and packaging, so that the reinforcement of the recycled aggregate is completed, the water absorption of the recycled aggregate is reduced, the phase-change material is packaged in the aggregate, and the separation loss of the recycled aggregate is reduced; the high-temperature heat absorption and low-temperature heat release performances of the organic phase-change material are utilized to relieve the stress damage of temperature impact to the internal structure, so that the heat preservation period during winter construction can be prolonged, and the effective hydration time of the cement can be prolonged.

The invention discloses a preparation method of solid waste for filling a karst cave, and relates to the technical field of buildings. Comprising the following steps: pretreating solid waste to obtain first pretreated solid waste; sieving the first pretreated solid waste to obtain a second pretreated solid waste; mixing the second pretreated solid waste with a slurry additive to obtain karst cave filling slurry; wherein the solid waste comprises at least one of mud, excavation soil and sludge. The solid wastes such as the slurry, the excavation soil and the sludge have the characteristics of fine particles, easiness in stirring, good dispersity and no pipeline blockage, so that the pollution of materials such as low-grade concrete, neat cement paste and composite paste slurry to water and soil environments can be avoided, and the raw material cost required by pouring and backfilling construction can be saved; and the outward transportation cost of solid wastes such as surface soil and slurry and the cost for treating environmental pollution are saved.

The utility model discloses a JDG guide pipe connecting mechanism which comprises a heat-shrinkable sleeve and a locking mechanism, guide pipe connectors are arranged on the two sides of the heat-shrinkable sleeve, guide grooves are formed in the inner sides of the guide pipe connectors, self-locking plug pins and spring mechanisms are arranged on the guide grooves, the self-locking plug pins are connected with the spring mechanisms, the locking mechanism is a buckle, and the heat-shrinkable sleeve is connected with the heat-shrinkable sleeve. According to the quick locking device for the JDG guide pipe, through the combination of the heat-shrinkable sleeve, the self-locking structure and the quick locking device, cement paste is prevented from permeating into the guide pipe, and the construction efficiency and the sealing performance are improved.

The invention provides a post-grouting FRP steel pipe pile construction method and device and a miniature composite pile. The method comprises the steps that firstly, bottom positioning parameters of a composite pile comprising multiple sections of pile body rod units are obtained, and according to the bottom positioning parameters, segmented grouting equipment comprising an air bag, an air injection hose and a grouting hose is hoisted to the bottom of the pile; the air bag is inflated through the air injection hose to form a closed grouting space; cement paste is injected into the space through a grouting hose, and the cement paste is injected into an external soil body around the pile body rod unit through a one-way circulation hole in the pile body rod unit; when the interior of the pile body of the composite pile is filled with cement paste and external grouting is completed, grouting is stopped, and air in the air bag is released; and the equipment is lifted to the previous section of pile body rod unit, and the steps are repeated till full-length grouting of the pile body is completed. Through precise positioning, segmented grouting and intelligent control, it is ensured that the pile body and soil around the pile are filled with cement paste, the bearing capacity and corrosion resistance of a pile foundation are enhanced, and efficient and durable foundation reinforcement is achieved.

The invention discloses a rapid tool lifting system for road and bridge construction. The rapid tool lifting system comprises a rail and a sliding table installed on the rail in a sliding mode. The driving mechanism is fixedly mounted on the sliding table; the lifting mechanism is mounted at the upper end of the driving mechanism; the connecting seat is fixed at the lifting end of the lifting mechanism; the lifting mechanism is fixedly mounted at the front end of the connecting seat; and the winding mechanism is detachably mounted at the upper end of the connecting seat. The rainproof cloth which can be controlled by the rolling mechanism is arranged on the outer side of the lifting mechanism, so that the flexible protective cover which can be opened and closed is formed, when the tool is lifted and moved, the rainproof cloth can be put down, a wrapping space is formed, the tool is effectively prevented from colliding and scraping with a surrounding bridge structure (such as a pier, a guardrail and a box girder), and the service life of the tool is prolonged. And meanwhile, most of pollutants such as dust and cement paste can be isolated, cleaning of tools and a lifting mechanism is protected, and the service life of equipment is prolonged.

The invention discloses a seabed shallow casing section thermal insulation structure for polar region supercritical carbon dioxide drilling, which comprises a casing, a thermal insulation coating, a protective coating, an annular cement slurry layer, an electric heating pipe, a sensor module, a wireless conductive module, a ground system and a seabed wireless transmission module, and is characterized in that the electric heating pipe is fixed on the outer wall of the casing through a hoop; the outer wall of the casing pipe is sequentially coated with a heat preservation coating, a protective coating and an annular cement paste layer from inside to outside, the wireless conductive module is integrated at the end of the casing pipe, and the ground system comprises a ground data acquisition system and a ground control center. The sea surface platform is provided with a ground data acquisition system and a ground control center which are connected with the seabed wireless transmission module through an umbilical cable, and temperature and pressure data acquired by the sensor module are uploaded to the ground control center. According to the invention, the problems of rapid heat loss, annular air channeling, casing mechanical property degradation, poor drilling fluid fluidity and the like of the seabed shallow casing section in the polar region extreme low-temperature environment are solved.

The invention discloses interface-enhanced granite concrete and a preparation method thereof, and belongs to the technical field of concrete. The granite concrete is prepared from the following components in parts by mass: 30 to 40 parts of cement, 40 to 50 parts of modified granite coarse aggregate, 50 to 60 parts of fine aggregate, 20 to 30 parts of mixed filler, 1 to 3 parts of low hydration heat polycarboxylate superplasticizer, 0.5 to 2 parts of shrinkage reducing agent and 10 to 30 parts of water. The granite is subjected to surface modification, and the novel low-hydration-heat polycarboxylate superplasticizer is adopted, so that the interface adhesion performance of granite aggregate and cement paste is remarkably improved, and the performances such as compressive strength and tensile strength of the granite concrete are greatly improved; therefore, the concrete has good application prospect and value in the technical field of concrete.

The construction method comprises the following steps that S1, a long spiral drill rod downwards rotates rightwards and forwards to drill to a specified depth, and part of loose soil is upwards returned; s2, when drilling to the designed depth, cement paste is injected into the lower end of the pile for ground expansion stirring, and the thickness of a bearing layer at the pile end is reserved; s3, cement paste and sandy soil are stirred in the soil layer on the upper portion of the bearing stratum through a mechanical stirring bottom-expanding drill bit device to form a bottom-expanding large-head pile; s4, the long spiral drill rod is lifted to the ground; and S6, a precast pile is implanted downwards. According to the method, the pile end bearing capacity is improved, the precast pile length is reduced, an existing long spiral drilling machine is adopted, the use cost is low, the construction speed is high, application and popularization are easy, and the pile end bearing capacity is improved.

The invention belongs to the technical field of deep foundation pit supporting, and discloses a deep foundation pit gushing water emergency plugging anchor rod and a construction method thereof.The deep foundation pit gushing water emergency plugging anchor rod comprises an anchor rod body, and a conical head is fixed to the head of the anchor rod body; a quick-setting cement bag is connected to the periphery of the anchor rod body on the rear side of the conical head, and quick-setting cement is contained in the quick-setting cement bag; the outer side of the quick-setting cement bag and the periphery of the anchor rod body are wrapped with a water-soluble isolating membrane; the outer side of the water-soluble isolating membrane is wrapped with a super absorbent resin layer, and the super absorbent resin layer is used for absorbing water to expand and block the anchor rod drill hole. When water bursts suddenly in the anchor rod drill hole, the super absorbent resin layer swells rapidly after meeting water to fill a gap between the hole wall of the anchor rod drill hole and the anchor rod body, meanwhile, the quick-setting cement bag can be broken through extrusion, the quick-setting cement and the bursting water are mixed to generate cement paste to fill the outer side of the conical head, finally, a solidified body is formed, and through double plugging, the water bursting effect is improved. The gap between the anchor rod body and the anchor rod drill hole is filled, the anchor rod drill hole can be blocked in time, the hole collapse risk is reduced, and meanwhile the blocking efficiency is improved.

The invention provides a concrete waste crushing particle size distribution analysis method and device, and the method comprises the steps: obtaining concrete waste image data, extracting a particle contour and geometric parameters through image recognition, determining a particle contact point displacement feature, and recognizing a stress concentration region migration path. Obtaining a particle morphology data set containing stress transfer path deflection information; performing gray value processing on the particle surface image, identifying a cement paste stripping area caused by shear stress component change through brightness difference to obtain interface stripping stress state distribution information, and calculating shear breaking ultimate strength distribution characteristics based on stress transfer path deflection information; and fuzzy clustering processing is carried out on the particle data set, if boundary fuzzy particles exist, crushing force transmission characteristics of the boundary fuzzy particles are obtained according to mechanical response time-frequency analysis, and the crushing risk level of the boundary particles is identified in combination with a particle internal crack initiation force threshold.

The application discloses a high-value resource utilization system and method of waste concrete, and the system comprises a preheating subsystem, a calcining subsystem, a cooling subsystem, a separating subsystem, a crushing subsystem, a dust collecting subsystem and a conveying subsystem. Waste concrete which is coarsely separated and pre-homogenized is mixed into cement raw materials to produce silicate cement clinker, and the test block after coarse crushing, screening, fine crushing and screening is directly stripped, and the separated powder can be used as a mixing material; the test block after stripping is preheated and calcined in a rotary kiln, the obtained material is cooled and stripped, and then sent into a V-type powder separator to separate coarse aggregates, and the fine aggregates and recycled waste concrete micro powder are separated through the powder separator and a dust collector. The application realizes the synergistic effect of pollution reduction and carbon reduction by combining with a cement production line, separates fine aggregates, coarse aggregates and hardened cement paste in the waste concrete, and realizes the high-value resource utilization of the waste in multiple ways according to the characteristics of each component.

The invention discloses a simulation device and method for simulating the deformation degree of a duct piece in the duct piece construction process, and relates to the technical field of simulation of the deformation degree of the duct piece in a tunnel, and the simulation device comprises a plurality of strip-shaped inner plate bodies capable of forming an inner cylinder in a surrounding mode and a plurality of strip-shaped outer plate bodies capable of forming an outer cylinder in a surrounding mode. The inner wall and the outer wall of the strip-shaped inner plate body are arc surfaces, threaded holes A are formed in the left end face and the right end face of the strip-shaped inner plate body, a plurality of displacement sensors are fixedly arranged on the inner wall of the strip-shaped inner plate body in the length direction of the strip-shaped inner plate body, and a wire of each displacement sensor is pasted and fixed to the inner wall of the strip-shaped inner plate body through an adhesive tape; the inner wall and the outer wall of the strip-shaped outer plate body are arc faces, and threaded holes B are formed in the left end face and the right end face of the strip-shaped outer plate body. The simulation device further comprises a left supporting seat and a right supporting seat. The device has the beneficial effects that the squeezing degree of a pea gravel backfill grouting body formed by pea gravels with different particle sizes and cement paste on a pipe piece can be simulated.

The invention discloses magnesium phosphate cement paste based on low-temperature calcined phosphate tailings and a preparation method of the magnesium phosphate cement paste, and relates to the technical field of magnesium phosphate cement materials. Uniformly mixing soluble phosphate, low-temperature calcined phosphate tailings, light calcined magnesia and a delayed coagulation substance to obtain a mixed dry material; adding the calculated water reducing agent into water, and fully and uniformly mixing for later use; the mixed dry material and the water reducing agent mixed solution are mixed, magnesium phosphate cement paste is obtained, the dry material mixing time is not less than 1 min, and the stirring time is not less than 150 s when the mixed solution is added. The phosphate tailings are used for replacing dead-burnt magnesium oxide, so that a large amount of consumption of the existing accumulated phosphate tailings can be realized, the value of the phosphate tailings is improved, effective elements in the phosphate tailings are fully utilized, cyclic utilization of resources is realized, meanwhile, the manufacturing cost of the magnesium phosphate cement can be remarkably reduced, and impurities such as silicon and aluminum in the phosphate tailings possibly form a compact structure; the acid corrosion resistance and the salt corrosion resistance of MPC are improved.

The invention discloses an experimental method and system for evaluating the sealing capability of a microcrack of wellbore annulus cement stone. The method comprises the following steps: step 1, preparing cement paste; 2, curing the cement paste to obtain a set cement sample; 3, a saline solution is prepared according to the formation water mineralization degree; 4, placing the saline solution and CO2 in a piston type intermediate container; 5, the set cement sample is saturated with saline water; step 6, pressurizing the cement stone sample saturated with the saline water to form a crack, so as to obtain the initial permeability of the cement stone sample; step 7, putting the cement stone sample subjected to fracture forming into a core holder, and monitoring the pressure of the inlet end of the core holder; when the pressure change of the inlet end of the core holder reaches an expected rising and falling trend, collecting data of the pressure of the inlet end to obtain an end point permeability; 8, if the terminal permeability is lower than the initial permeability, it shows that the set cement sample has the micro-crack self-sealing capacity. The experimental method and system simulate and measure the change of the sealing performance in the shaft direction.

The application provides a kind of concrete chloride ion diffusion coefficient prediction method based on aggregate gradation, comprising the following steps: obtaining the chloride ion diffusion coefficient D ref Of cement paste;Obtaining the specific surface area s i Of aggregate in each particle size interval;Obtaining the thickness of concrete interfacial transition zone;Calculating the chloride ion diffusion coefficient of concrete.The application considers the influence of all components (cement paste, aggregate, interfacial transition zone) on chloride ion diffusion coefficient from the composition of concrete, and the influence of aggregate particle size on the thickness of interfacial transition zone, and the prediction result has high accuracy, which can provide effective reference for the evaluation of concrete resistance to chloride ion erosion.

The utility model discloses a slope protection anchor rod with good protection performance for bridge and tunnel engineering, which belongs to the technical field of slope protection anchor rods, and is characterized by comprising an anchor rod body, a conical sleeve, a fixing plate, a fixing nut and a grouting hole, the bottom of the anchor rod body is fixedly connected with a limiting block, and a locking mechanism is arranged on the surface of the limiting block. The problems that after most of existing slope protection anchor rods are placed in a pre-drilled hole, a grouting hole makes contact with the deepest position of the hole, soil in the hole blocks a grouting opening, cement paste is not conveniently and rapidly injected into the hole through the grouting hole, and the grouting hole is blocked are solved. And after the slope protection anchor rod is inserted into the hole, the anchor rod needs to be rotated, so that an expansion structure at the bottom of the slope protection anchor rod expands to be in contact with the inner wall of the hole to limit the slope protection anchor rod, the step of constructing the slope protection anchor rod is increased by rotating the slope protection anchor rod, the construction efficiency of the slope protection anchor rod is influenced, and the use effect is influenced.

The invention discloses preparation and application of a pH-responsive slow-release hydration heat inhibitor, and belongs to the technical field of concrete admixtures. The inhibitor is slowly released in a cement paste alkaline environment, cement hydration is continuously slowed down, and the temperature cracking risk of concrete caused by hydration heat is reduced. The core component is a pH sustained release microsphere, and the pH sustained release microsphere is composed of octadecyl acrylate, Span 80, Tween 60, white oil, acrylic acid, allyl polyoxyethylene ether 500, N, N-methylene bisacrylamide, deionized water, tert-butyl hydroperoxide, sodium pyrosulfite and the like. The preparation method comprises the steps of mixing an oil phase and a water phase, emulsifying, reacting and the like. The inhibitor further comprises sorbitol and methanol, and is prepared through the steps of stirring, filtering, drying and the like. The inhibitor can effectively reduce the hydration heat of cement, delay the setting time and improve the compressive strength of concrete.

The invention belongs to the technical field of concrete, and particularly relates to carbon dioxide foam concrete as well as a preparation method and application thereof. Comprising the following steps: obtaining a gel raw material comprising cement, a nano filler and a mineral admixture, and preparing the gel raw material into cement paste; the preparation method comprises the following steps: preparing a foaming solution from a hydrogel thickener, a water repellent agent, a foaming agent and water, and introducing gas containing carbon dioxide to prepare carbon dioxide foam; carbon dioxide foam and cement paste are mixed to prepare mixed paste, and the mixed paste is formed to obtain a formed concrete blank; and performing internal carbonization curing and external carbonization curing on the concrete green body, and performing natural curing to obtain the carbon dioxide foam concrete. Through internal and external carbonization maintenance, a large amount of carbon sequestration is realized, micropores are filled by virtue of a product generated by carbonization, the aperture is refined, the collapse of a foam structure is reduced, the foam concrete is enhanced, the compressive strength and durability of the carbon dioxide foam concrete are improved, and the durability of the carbon dioxide foam concrete can be enhanced.

The invention discloses a foam light soil upright roadbed pouring method, and belongs to the technical field of upright roadbed construction, a raw material proportioning processing module and a pouring processing module are included, a foaming agent diluent is prepared into foaming liquid through a physical method, then compressed air is injected into the foaming liquid to prepare foam, and the foam light soil upright roadbed is formed. The foam, the cement, the active admixture, the water, the additive, the sandy soil and the industrial waste residue material are mixed and stirred according to a preset proportion to prepare a to-be-poured mixed solution, the to-be-poured mixed solution is conveyed to a pouring area through a pipeline, and layer-by-layer pouring is carried out. The method is designed for the situation that the high-fill soft soil upright roadbed is prone to collapse, cement paste and foaming foam are prepared and poured into the upright roadbed according to the preset proportion, layer-by-layer pouring is adopted, EPS foam plates are used for partitioned pouring, the pouring quality is guaranteed, meanwhile, the pouring efficiency can be remarkably improved, and the construction period is shortened; and the longitudinal and transverse gradients are adjusted by using a base material, so that the slope surface of the whole upright roadbed meets the design requirements.

The invention discloses a device and method for evaluating the sealing performance of a shaft under the geological storage in-situ condition of carbon dioxide, and the device comprises a corrosion shaft test module, a carbon dioxide displacement module, a gas channeling simulation module, a shaft temperature and pressure control module and a stratum temperature and pressure control module. The shaft assembly is arranged in the testing shell in a penetrating mode, closed cavities are formed between the top end of the shaft assembly and the top end of the testing shell and between the bottom end of the shaft assembly and the bottom end of the testing shell, and a gas flow meter is installed at the top end of the testing shell. And a confining pressure bin and a heating bin are sequentially arranged in the test shell in the radial direction away from the shaft assembly. The device can simulate the lithology-temperature-pressure-carbonic acid environment in the geological storage process of carbon dioxide, and the sealing capacity of a shaft under the in-situ service condition is evaluated; therefore, the purposes of optimizing the formula of the cement paste, optimizing the material of the sleeve and reducing the risk of carbon dioxide leakage are achieved.

The invention relates to polyformaldehyde fiber concrete based on a stud area of a steel box girder, and belongs to the technical field of building materials. The polyformaldehyde fiber concrete comprises the following components in parts by weight: 400-550 parts of cement; 80 to 180 parts of water; 1000 to 1100 parts of coarse aggregate; 700 to 780 parts of fine aggregate; the surface of the calcium sulfate whisker is coated with a silane coupling agent. The polyformaldehyde fibers and the calcium sulfate whiskers are added into the concrete at the same time, the calcium sulfate whiskers are doped to provide a framework support for the concrete, after the calcium sulfate whiskers are wrapped by the cement paste, the calcium sulfate whiskers and other materials jointly form a three-dimensional supporting structure, and concrete pores can be filled with part of the whiskers, so that the compactness and compressive strength of the concrete are enhanced. The polyformaldehyde fibers are added, so that stress can be effectively dispersed, when the concrete is pressed, the polyformaldehyde fibers and a cement matrix bear loads together, the stress concentration phenomenon is reduced, and the compressive strength of the concrete is further improved.