397 results about "High performance concrete" patented technology

The invention discloses a hypergraph neural network-based PVA fiber toughened UHPC material formula design method. The method comprises the steps of 1, multi-modal data acquisition and processing, 2, hypergraph structure construction, 3, HGNN model construction, 4, model training, and 5, performance optimization and reverse ratio design. According to the method, the high-order relationship among the multi-modal data such as the raw material, the proportion and the microstructure can be efficiently modeled, the precise prediction of the performance of the PVA fiber toughened UHPC and the optimal design of the proportion are realized, and the method is suitable for the performance prediction and proportion recommendation of various ultra-high performance concrete systems, and has wide engineering application prospects and industrial popularization values.

The invention discloses an energy storage battery box based on light high-performance concrete and a preparation method of the energy storage battery box, and belongs to the technical field of energy storage equipment. The energy storage battery box provided by the invention comprises a light high-performance concrete base body and a metal net embedded in the light high-performance concrete base body, according to the lightweight high-performance concrete matrix, a multi-component gel system composed of ordinary Portland cement, a shrinkage reducing agent, a solid waste-based geopolymer and steel slag micro powder is adopted, and solid waste-based artificial sand, fibers and a solid waste-based filling material in a specific proportion are compounded, so that a lightweight high-strength intrinsically fireproof concrete material is successfully prepared; meanwhile, a large amount of industrial solid wastes such as the desulfurized gypsum, the red mud, the steel slag tailings and the fly ash are utilized, efficient resource utilization is achieved, the raw material cost and full-life-cycle carbon emission are remarkably reduced, and the production efficiency is high.

The invention relates to the technical field of data processing, in particular to a BN-based UHPC mix proportion data analysis method and a strength prediction system.The intelligent level of ultra-high performance concrete mix proportion design is improved by introducing a Bayesian network model and a multi-objective optimization algorithm, and the method comprises the steps that firstly, an enhanced feature set is generated through feature engineering; a nonlinear relationship and a cross-level interaction effect among material parameters are fully excavated, and the characterization capability of the model on a complex material system is enhanced; secondly, the Bayesian network model is combined with causal reasoning and a hierarchical regularization strategy, so that the overfitting risk is reduced while the compressive strength prediction precision is ensured; in the multi-objective optimization link, through dynamic weight adjustment and Pareto frontier search, carbon emission and strength requirements are effectively balanced, and candidate schemes with low carbon and excellent mechanical properties are output; and finally, dynamic evaluation and risk analysis are carried out to further screen out a mix proportion with high stability and strong feasibility, and a reliable decision basis is provided for engineering practice.

The invention relates to the technical field of pumped storage power station water diversion systems, and discloses a method and device for determining a pressure pipeline reinforcement ultra-high performance concrete lining structure. The method comprises the steps that internal pressure information, radius information and lining thickness information of a target water channel, the design tensile strength of a tensile steel bar, the tensile stress borne by ultra-high performance concrete and the lining section area per unit length are obtained; calculating circumferential stress information of the target water channel based on the internal pressure information and the radius information; based on the circumferential stress information and the lining thickness information, the tensile force resultant force of the lining section in unit length is determined; determining the total sectional area of the tensile steel bars based on the tensile resultant force of the section of the lining in unit length, the designed tensile strength of the tensile steel bars, the tensile stress of the ultra-high performance concrete and the section area of the lining in unit length; determining the number of to-be-assembled reinforcements based on the total sectional area of the tensile reinforcements; and the pressure pipeline reinforcement ultra-high performance concrete lining structure is determined based on the number of the to-be-assembled steel bars and a preset steel bar arrangement rule.

The invention discloses a local reinforcing device of a marine concrete pile and a construction method of the local reinforcing device, and belongs to the technical field of pile foundation construction engineering.The local reinforcing device comprises a reinforced concrete pipe pile, a steel pipe with an epoxy anti-corrosion coating and annular positioning hoops, and the upper end and the lower end of the outer wall of the steel pipe with the epoxy anti-corrosion coating are each connected with a set of annular positioning hoops; the steel pipe with the epoxy anti-corrosion coating and the reinforced concrete pipe pile are coaxially arranged, the steel pipe with the epoxy anti-corrosion coating is located at the broken pile position of the reinforced concrete pipe pile, and the steel pipe with the epoxy anti-corrosion coating and the reinforced concrete pipe pile are locked through the two sets of annular positioning hoops. By adopting the steel pipe with the anti-corrosion coating, welding the shear nails in the steel pipe, pouring the ultra-high performance concrete UHPC and a corresponding construction method, by utilizing the characteristics of high flowability, high impermeability and early high strength of the ultra-high performance concrete UHPC and combining the interface strengthening effect of the shear nails, the pain point of the traditional technology is accurately solved, and the construction efficiency is improved. And a reliable scheme is provided for ocean engineering broken pile reinforcement.

The invention discloses a UHPC formwork interlocking type shear wall and a construction method thereof.The construction method comprises the following steps that S1, a first shear wall and a second shear wall are prefabricated, and a UHPC formwork is installed at the end of the second shear wall; s2, configuring a combination relationship between the reinforcement cage and the shear wall based on the target structure form; s3, the end, away from the second shear wall, of the UHPC formwork is in positioning butt joint with the extending part of the first shear wall, and a formwork cast-in-place cavity is formed; and S4, concrete is poured into the cast-in-place cavity of the formwork, and curing and forming are conducted after vibrating and compacting are conducted. The structure is simple, UHPC is adopted as a permanent formwork to replace a traditional detachable formwork, on-site formwork-erecting-free construction is achieved, the formwork mounting and dismounting procedures in traditional cast-in-place shear wall construction are thoroughly omitted, and the construction period is shortened by 30% or above; and in combination with a hoisting-pouring two-stage construction process, mold-free and binding-free construction of the edge structure area is further achieved, and the overall construction efficiency is improved by 40% or above.

The invention relates to a method for detecting the strength of ultra-high performance concrete through a core drilling method with the diameter of 52 mm. The method comprises the following steps that S1, steel bar distribution is detected on a to-be-detected ultra-high performance concrete member through a steel bar detector, and a steel bar distribution grid is drawn; s2, core samples with the diameter of 52 mm are drilled in the grids; s3, after processing the core sample, carrying out a compressive strength test to obtain a compressive strength value of the core sample; and S4, presuming the structural concrete strength by utilizing a correction coefficient formula according to the compressive strength value of the ultra-high performance concrete core sample. According to the method, the optimal core sample size of UHPC sampling is obtained through a contrast test, a correction coefficient formula suitable for the UHPC optimal core sample is obtained according to test data, the obtained optimal core sample size meets the standard requirements, damage to the UHPC component is minimum, and the strength of the UHPC component can be obtained.

The invention relates to a digital intelligent regulation and control preparation method of a high-solid-waste low-carbon high-durability concrete connecting material, and solves the problems that an existing UHPC connecting material is difficult to balance high performance and low carbon, the solid waste resource utilization rate is low, a digital intelligent precise regulation and control means is lacked, and the cost is low. The method comprises the following steps: firstly, integrating data to construct a special database for the ultra-high performance concrete, establishing a raw material-process-performance mapping relation through multi-scale simulation, then optimizing target parameters through machine learning, preprocessing the raw materials, and finally obtaining the ultra-high performance concrete after the target parameters are optimized and the raw materials are preprocessed. And verifying the iterative model by using a high-throughput experiment, determining optimal process parameters, importing the optimal process parameters into a system, and executing stirring, forming and curing. The method has the following beneficial effects that high solid waste recycling and low-carbon emission reduction are achieved through digital intelligent regulation and control, high strength and high durability of materials are synchronously guaranteed, and the core application requirements of an assembly type structure are precisely met.

The invention discloses a high-performance concrete repairing material, application and a concrete structure repairing method, and belongs to the technical field of concrete structure repairing. The high-performance concrete repairing material is prepared from Portland cement, rapid hardening cement, an inert mineral admixture, an early strength agent, a submicron mineral admixture, a nano material, an anti-freezing binder, fibers, a retarder, a volume compensating agent, fine aggregate, coarse aggregate, a water reducing agent, a defoaming agent and water. Through the interaction of all the components, the functions of early strength, volume stability, freezing resistance, salt freezing resistance, fracture resistance, shrinkage resistance and the like are achieved, through the synergistic effect of all the components in the material, the overall performance of the material is improved, and the material has excellent adaptability and multifunctionality under different environmental conditions; therefore, long-term stable guarantee is provided for application in various damage scenes, and the proportion of each component of the material can be adjusted according to actual requirements of concrete structures so as to meet efficient repair in different damage scenes.

The invention discloses a mechanical property testing device for mixed directional fiber ultra-high performance concrete, which comprises a base, a power mechanism is arranged on the base, fixed rotating components are movably arranged on the left side and the right side of the power mechanism, and the power mechanism drives the fixed rotating components on the two sides to synchronously and reversely move; a supporting assembly is arranged in the middle of the top end of the base. A loading assembly is arranged above the supporting assembly. A test piece is loaded between the fixed rotating assemblies on the two sides, the supporting assembly is used for bearing the test piece, the form of a supporting surface can be changed according to test requirements, and the loading assembly is located on the upper side of the test piece so as to apply vertical pressure to the test piece; the device can acquire various test data such as compression resistance, tension resistance, torsion resistance and wear resistance in real time, can comprehensively reflect the mechanical properties of the mixed oriented fiber ultra-high performance concrete, provides an accurate and reliable test basis for engineering application and performance optimization of such materials, and solves the problems that the existing device has single test data and cannot meet the engineering practice requirements.

The invention discloses a performance detection method and system for ultra-high performance concrete, particularly relates to the technical field of building material performance detection, and aims to solve the problem of strength test discreteness caused by neglecting of an aging effect after high-temperature maintenance in an existing detection method. The method comprises the following steps: recording a first time point when a test piece is cooled at room temperature and a second time point when a press machine is loaded, and generating a comprehensive aging factor in combination with double quantitative analysis of a fiber pull-out fragment proportion and a crack fractal dimension in a damage process image; matching a strength correction coefficient from a preset table according to the aging factor, and dynamically calibrating a first compressive strength test result; accurate association between the aging damage mechanism and the macroscopic strength is achieved, and the reliability evaluation precision of the ultra-high performance concrete in major engineering is remarkably improved.

The invention belongs to the field of cement concrete, and particularly relates to an integrated cementing material special for ultra-high performance concrete and a preparation method of the integrated cementing material. The integrated cementing material comprises fly ash, slag powder, carbide slag, semi-hydrated gypsum, silica fume, a powder reinforcing agent, calcium nitrate and sodium silicate. The production process of the integrated cementing material comprises the following steps: winnowing ultrafine microbeads from fly ash, grinding solid waste powder by a fluidized bed type jet mill, chemically strengthening the powder reinforcing agent, chemically nucleating calcium nitrate and sodium silicate, and mixing the integrated cementing material. The ultra-high performance concrete cementing material is prepared from a high-activity solid waste material, the viscosity of a mixture is reduced by winnowing ultrafine micro-beads, the strength of the cementing material is improved by synergistic reaction of slag powder, carbide slag and semi-hydrated gypsum, and a C-S-H crystal nucleus is formed by chemical reaction of calcium nitrate and sodium silicate to provide active sites, so that the cementing material is prepared. And the cementing material is prepared by combining powder chemical dispersion and integrated mixing, so that the carbon emission and production difficulty of the ultra-high performance concrete are remarkably reduced.

The invention discloses a method for predicting mechanical properties of ultra-high performance concrete, particularly relates to the technical field of dynamic property analysis of building materials, and aims to solve the problem that sudden brittle failure of materials cannot be accurately predicted under impact and explosion loads in the conventional method. The method comprises the following steps: calculating a macroscopic stress-strain response based on a continuum mechanical equation by acquiring a material ratio parameter and a dynamic load condition; constructing topological features through the strain energy entropy change rate to locate a damage area; determining an interface debonding energy threshold value and a crack growth rate of the damaged area in combination with interface fracture mechanics; utilizing the law of conservation of energy to establish dynamic correlation between interface debonding energy and strain energy density; when the crack growth rate exceeds an interface debonding energy threshold value, correcting macroscopic response data of a sudden stress drop interval based on the dynamic association relationship; the cross-scale coupling of a microscopic damage mechanism and a macroscopic mechanical behavior is realized, and the prediction precision under a dynamic load is remarkably improved.

The invention relates to the technical field of building materials, and particularly discloses ultra-high performance concrete containing coarse aggregate, a preparation method of the ultra-high performance concrete and a method for testing the abrasion resistance of the ultra-high performance concrete, the ultra-high performance concrete containing the coarse aggregate comprises cement, a mineral admixture, fine aggregate, steel fiber, the coarse aggregate, an additive and water, and the coarse aggregate is pretreated through cationic emulsified asphalt. The coarse aggregate ultra-high performance concrete is subjected to molding preparation, demolding maintenance, vacuum water saturation and other processes to obtain an original test piece for testing the abrasion resistance, two sub test pieces are obtained after radial cutting, and the mass of the test pieces before and after abrasion is weighed to obtain the abrasion resistance strength. According to the testing method, the abrasion resistance of the surface mortar layer and the abrasion resistance of the internal aggregate layer in the same test piece can be compared, and the abrasion resistance of the ultra-high performance concrete containing the coarse aggregate can be evaluated more comprehensively and objectively. The coarse-aggregate ultra-high-performance concrete has excellent mechanical properties, the abrasion resistance is enhanced, the use amount of a cementing material can be effectively reduced, and the production cost is reduced.

The invention belongs to the field of deep foundation pit intelligent supporting systems, and particularly relates to a deep foundation pit intelligent supporting system based on oblique beam grid and digital twinning and a collaborative construction method.The deep foundation pit intelligent supporting system based on oblique beam grid and digital twinning comprises an oblique beam grid supporting structure composed of two-way crossed steel oblique beams, and the outer layer of each steel oblique beam is a Q355B steel pipe with the thickness not smaller than 12 mm; the inclined beam is filled with ultra-high performance concrete with the compressive strength not smaller than 150 MPa, the inclination angle of the inclined beam ranges from 25 degrees to 60 degrees, and an MEMS micro-electro-mechanical system sensor is pre-buried at a node; and the digital twin platform integrates the geological BIM model and the LSTM neural network prediction model. The bending rigidity is improved through the oblique beam grid supporting structure and the concrete filled steel tube composite beam, the inclination angle ranges from 25 degrees to 60 degrees, force flow transmission is optimized, and micro-strain-level stress monitoring is achieved through the MEMS sensors embedded in the nodes. A digital twin platform and an LSTM model are fused with 12-dimensional parameters, the 72-hour deformation prediction error is smaller than or equal to 1.5 mm, and compared with a traditional experience algorithm, the precision is improved.

The invention relates to the technical field of ultra-high performance concrete, in particular to a low-carbon low-cost UHPC design method based on waste residue activity threshold regulation and control, which comprises the following steps: selecting performance parameters matched with a UHPC service environment according to the UHPC service environment; detecting physical parameters of to-be-used waste residues, and performing pretreatment to obtain a feature set; inputting the feature set and the performance parameters into a database, and screening out a formula set; performing optimal confirmation on formulas in the formula set based on the influence factors to obtain a test formula; preparing UHPC according to the test formula, and monitoring process parameters in the preparation process; comparing the process parameters with a standard parameter threshold to obtain an offset degree, and correcting the test formula according to the offset degree to obtain an optimal formula; through association of environmental performance requirements and waste residue characteristics, database screening, optimization confirmation and process correction, the obtained optimal formula can adapt to the use environment, scientific utilization of waste residues is realized, and low carbon, low cost, unified accuracy, high efficiency and stability are considered.

The UHPC assembly type machine room structure comprises a machine room enclosure bulkhead cylinder body, a first end cover and a second end cover, wherein the machine room enclosure bulkhead cylinder body is prefabricated by adopting an ultra-high performance concrete UHPC material; the machine room enclosure bulkhead cylinder body is provided with a bottom plate and two side walls, and the machine room enclosure bulkhead cylinder body is provided with a first opening end and a second opening end which are oppositely arranged; the first end cover and the second end cover are respectively arranged at the first opening end and the second opening end; the two end covers are provided with smoke suction and exhaust ports used for being connected with a ventilation pipeline. A machine room access door is arranged on one side wall; an internal smoke exhaust pipeline is arranged in the machine room enclosure bulkhead cylinder body, the two ends of the internal smoke exhaust pipeline are connected with the smoke suction and exhaust ports in the first end cover and the second end cover respectively, and the fan is arranged on the internal smoke exhaust pipeline. The UHPC shell is adopted and serves as an outer enclosure material of the machine room structure at the same time, the functions of enclosure, decoration, structural bearing and partial fire prevention are achieved, and building structure decoration and function integration is achieved.

The invention relates to a UHPC-based fabricated fire-fighting smoke exhaust fan room structure and a construction method thereof, the room structure comprises a main body structure, and the main body structure is prefabricated by adopting an ultra-high performance concrete UHPC material; a fan is arranged in the internal space of the main body structure; the main body structure is provided with a machine room enclosure bulkhead cylinder body and an end cover side wall. Wherein the machine room enclosure bulkhead cylinder body is provided with a bottom plate, a first side wall and a second side wall, the first side wall and the second side wall are connected with the bottom plate and vertically arranged in parallel, and a first opening end and a second opening end which are oppositely arranged are arranged at the two ends of the machine room enclosure bulkhead cylinder body in the horizontal direction respectively; the end cover side wall is provided with a first end cover and a second end cover which are respectively arranged at the first opening end and the second opening end; the first end cover and the second end cover are each provided with a smoke suction and exhaust port, and the smoke suction and exhaust ports are used for being connected with a ventilation pipeline. The UHPC shell is adopted, the advantages of being high in strength and good in fire resistance are achieved, the prefabricated assembly type structure is adopted, construction is convenient, and efficiency is high.

The invention relates to the technical field of energy-saving equipment, and discloses a high-performance concrete automatic batching device which comprises a fixing support used for supporting the high-performance concrete automatic batching device, the top of the fixing support is fixedly connected with a supporting cylinder, and the interior of the supporting cylinder is fixedly connected with a batching assembly. The top of the batching assembly penetrates through the supporting cylinder and extends to the outer side of the top of the supporting cylinder, a driving chamber is fixedly connected to the extending part of the batching assembly, a control center is fixedly connected to the surface of one end of the driving chamber, a feeding port is formed in the rear end of the top of the batching assembly, and an opening and closing door is externally connected to the bottom of the batching assembly; the inner wall of the top side of the driving chamber is fixedly connected with a rotary driving assembly, the rotary driving assembly is specifically a driving motor, the bottom output end of the rotary driving assembly is fixedly connected with a rotating shaft, and the device has the advantages that the operation energy-saving effect of the lifting device in the batching process is achieved, and a user can use the device conveniently.

The utility model discloses a permanent and temporary combined assembly type underground structure plate wall connecting node which comprises an assembly type underground diaphragm wall, a full-length steel plate is installed on the side wall of the assembly type underground diaphragm wall, and a prefabricated structure plate is hoisted on the full-length steel plate. The gap between the prefabricated structural slab and the fabricated underground diaphragm wall is filled with ultra-high-performance concrete, and a steel bar structure is arranged in the ultra-high-performance concrete. According to the utility model, the rigid connection between the two prefabricated parts is realized, the integrity of the structure is improved, and the safety and durability of the underground structure are fully ensured; an underground diaphragm wall which is usually used as a temporary structure is changed into a permanent structure, so that the construction period is shortened, and the investment is saved; the ultra-high performance concrete poured in the joint can greatly shorten the anchoring length of the steel bars, enlarge the arrangement distance of the steel bars, obviously reduce the using amount of the steel bars on site and the binding workload, is convenient to install and simple in process, obviously improves the construction efficiency, and has high popularization and application value.

The invention discloses a high-performance concrete detection method, and relates to the technical field of concrete detection. Comprising the following steps: sampling: performing segmented sampling and uniform mixing in an unloading process, acquiring image information of a sample, analyzing and pre-judging risks, generating a unique electronic tag for the sample, and binding related information of the batch of high-performance concrete; and fresh mixing performance testing: monitoring discharge rheological parameters in real time, automatically testing integrated slump, expansion degree, volume weight and gas content of the sample, judging workability and deciding pouring. According to the method, the solid curing test piece is manufactured and cured in the environment which is completely the same as the solid structure, the measured strength can more accurately reflect the actual development condition of solid concrete, the strength of the solid concrete is compared with the strength of the standard curing test piece, and the field curing effect is scientifically evaluated; the problem of high-performance concrete or the problem of field maintenance conditions can be better judged, and the accuracy of a detection result is improved.

The invention provides a concrete normal section reinforcement design method and system, electronic equipment and a storage medium. The method comprises the following steps: establishing a section stress model containing multi-layer reinforcement strain distribution based on plane section assumption; the stress state of the whole process of the section from axle center compression to axle center tension is simulated by setting strain proportion parameters of the strain of the outermost reinforcing steel bar on the tension side and the limit pressure strain of the concrete; aiming at a plurality of set strain state control points, calculating stress of each steel bar layer position, contribution of the stress to axial force and bending moment and contribution of the stress to a concrete compression area; and based on the section static balance condition, the optimal reinforcement area meeting the design load requirement is determined through iterative calculation, and the configuration constraint of multiple layers of steel bars is considered in the iterative calculation. The method overcomes the defects that a traditional method overestimates the effect of the pressed steel bars and ignores the strain difference of multiple layers of steel bars, and the accuracy and safety of reinforcement design of high-performance concrete structures such as nuclear islands are remarkably improved.

The invention discloses a method for establishing a concrete in-situ mesoscopic finite element model based on a CT (Computed Tomography) scanning technology, which is applied to the technical field of mesoscopic simulation of a concrete structure. The method comprises the following steps: firstly, performing XCT scanning on a steel fiber ultra-high performance concrete test piece to obtain a two-dimensional sequence image of an internal structure of the steel fiber ultra-high performance concrete test piece; then, image processing is carried out through Avizo software, and three-dimensional space distribution information of a base body, steel fibers and pores is segmented and extracted; on the basis of the three-dimensional information, a Python program is utilized to generate a finite element mesh, an eight-node hexahedron unit is adopted in a model, and the established model can accurately reflect real mesoscopic characteristics such as fiber orientation, distribution and pore defects.

The invention relates to a multi-element solid waste treatment method and a process for preparing self-compacting low-carbon ultra-high performance concrete by using the multi-element solid waste treatment method, and a self-compacting low-carbon ultra-high performance concrete system is constructed by using a multi-element solid waste synergistic utilization and material modification technology. The distribution of solid wastes with different particle sizes is accurately regulated and controlled by adopting a particle grading optimization model, and performance improvement is realized by combining multi-dimensional material activation and modification. A three-step modification process of high-temperature carbonization pore-forming, acid pickling activation and silane coupling is carried out on the superfine fly ash to form the admixture with both activity and interface enhancement effect; and an electrochemical stripping and microbial mineralization synergistic activation technology is innovatively adopted for the lithium slag, so that the potential activity is effectively excited. The fiber surface is modified through plasma etching and chemical grafting, a multi-scale hybrid fiber reinforcement is prepared in cooperation with an in-situ composite spinning technology, the material toughness is remarkably improved, meanwhile, the problems that ultra-high performance concrete is high in raw material cost, large in carbon emission and large in shrinkage are solved, and therefore the self-compacting low-carbon ultra-high performance concrete is obtained.

The invention relates to the technical field of concrete electric pole manufacturing, and discloses an optimized steel fiber anti-crack ultra-high performance concrete centrifugal electric pole manufacturing method and system. The method comprises the following steps: dividing an electric pole manufacturing process into a plurality of manufacturing units according to production batches, and collecting material component data, process setting data and online detection data in each manufacturing unit to form a multi-source production data set; calculating an anti-cracking performance index and a strength performance index based on a multi-source production data set, and dynamically outputting an initial process correction value through a dual-threshold monitoring mechanism and a performance adjustment model; performing adaptive adjustment on the initial process correction value of each manufacturing unit according to the production correlation between the adjacent manufacturing units to generate an adjusted process correction value; and carrying out serialization processing on the adjusted process correction value, and outputting a production optimization instruction which is applied to a manufacturing execution process. According to the method, electric pole manufacturing whole-process data integration and dynamic process optimization are achieved, and the production efficiency and the product quality stability can be improved.

The invention relates to a composite internal curing material for ultra-high performance concrete and a preparation method of the composite internal curing material. 100 to 160 parts of natural aggregate; 5 to 12 parts of magnesium oxide, 1.5 to 3.5 parts of ammonium dihydrogen phosphate, 1.5 to 5 parts of deionized water and 0.5 to 1.2 parts of carbon nanotube; wherein the magnesium oxide, the ammonium dihydrogen phosphate, the deionized water and the carbon nanotubes are treated to form an MPC / CNT composite coating, and the surface of the natural aggregate is coated with the MPC / CNT composite coating. By means of the MPC / CNT composite coating, water is efficiently stored and slowly released through an internal optimized multi-stage pore structure, and chemical shrinkage in the UHPC hydration process is accurately compensated. Meanwhile, the coating enhances the hydration degree of a matrix and strengthens an aggregate-slurry interface transition area, so that the self-constriction micro-strain is remarkably reduced, and the early cracking risk of the material is fundamentally reduced.

The utility model discloses a permanent and temporary combined prefabricated diaphragm wall type subway entrance and exit structure which comprises a structural side wall which is formed by integrating an enclosure structure and a main body structure, and the structural side wall is an assembled prefabricated diaphragm wall. A first temporary steel support for temporary supporting and a second permanent-temporary combination support for permanent-temporary combination are arranged between the prefabricated underground diaphragm walls, a cast-in-place bottom plate is arranged between the prefabricated underground diaphragm walls, and the second permanent-temporary combination support is located at the elevation position of the top plate. The joint of the prefabricated top plate cross beam and the prefabricated diaphragm wall adopts an ultra-high performance concrete cast-in-place joint, so that the physical performance is excellent, the construction workload is reduced, and the construction difficulty is reduced. The scheme that the water stop strip bags and the UHPC concrete wet joints are connected is adopted between the prefabricated diaphragm wall panels, and the waterproof and guiding effects are achieved under the condition that the steel consumption is effectively reduced. The assembly type prefabricated structure of the station entrance and exit structure is high in proportion.

The invention relates to the technical field of ultra-high performance concrete, in particular to an ultra-high performance concrete strength prediction method considering a particle close packing effect, comprising the following steps: S1, acquiring a data set to be measured, the data set comprising a macroscopic proportioning material and a material particle gradation; s2, according to the particle size distribution of the solid particle material in the data set, calculating the volume percentage of which the cumulative volume is smaller than a preset particle size through a corrected Andersen-Andersen model; s3, calculating the stacking compactness according to the volume percentage with the accumulated volume smaller than the preset particle size; and S4, inputting the stacking compactness and the to-be-measured data set into a prediction model to obtain a predicted value of the compressive strength of the ultra-high performance concrete. And by introducing microstructure quantitative indexes such as grain composition and stacking compaction parameters as model input, the prediction precision and reliability are remarkably improved.

The invention discloses an anti-permeability detection device for ultra-high performance concrete, and belongs to the technical field of anti-permeability detection. Comprising a mounting box body, the interior of the mounting box body is hollow, one end of the mounting box body is provided with a plurality of anti-permeability detection assemblies, one anti-permeability detection assembly comprises a mounting plate, a through hole is formed in the middle of the mounting plate, an annular groove is formed in the outer side of the through hole, and an annular sealing ring is arranged in the annular groove; the device comprises a mounting plate, vertical driving elements are symmetrically arranged on the mounting plate, the vertical driving elements are fixed to the mounting plate, the output ends of the vertical driving elements face the lower portion of the mounting plate, a lifting plate is arranged below the mounting plate and fixedly connected to the output ends of the vertical driving elements, a hollow pipe is arranged in the middle of the lifting plate, and the hollow pipe is fixedly connected to the output ends of the vertical driving elements. And one end of the hollow pipe is fixed on the lifting plate. According to the technical scheme, the problem that the end of the test piece collides with the bottom area of the test mold, and consequently the impermeability detection result is affected is solved.

The invention relates to the technical field of concrete structure manufacturing, in particular to a construction method for a prefabricated and assembled ultra-high-performance concrete exterior decoration plate by using a stand column. Each prefabricated assembled ultra-high performance concrete exterior trimming plate comprises an exterior facade part and an L-shaped part matched with the corresponding stand column, and each L-shaped part comprises an L-shaped structure capable of surrounding the corresponding stand column from two opposite directions. The outer vertical face part of the prefabricated and assembled ultra-high-performance concrete outer decoration plate is firstly poured, and the L-shaped part of the prefabricated and assembled ultra-high-performance concrete outer decoration plate is poured within a certain time, so that the ultra-high-performance concrete poured twice is fully mixed to form a whole. The method has the advantages that the whole structural form does not need a steel structure, so that the construction difficulty is greatly reduced while the cost is reduced; the hoisting weight and the hoisting construction difficulty are greatly reduced due to split prefabrication; when the decorative breast board is constructed, the purpose of repairing and reinforcing the stand column is achieved.