873 results about "Ultra high performance" patented technology

The invention relates to the technical field of ultra-high performance concrete detection, in particular to an ultra-high performance concrete construction process detection and analysis system based on multi-source data fusion. According to the technical scheme, the system comprises a multi-physics field sensing network, a heterogeneous data fusion engine, an intelligent diagnosis and analysis system and a visual decision support platform, and the multi-physics field sensing network is composed of multi-modal sensors deployed in links of raw materials, stirring, transportation, pouring and maintenance; and cross-scale data acquisition and heterogeneous data fusion engines from nanoscale interface reaction to meter-scale structure morphology are realized. Cross-scale and multi-physics-field comprehensive monitoring is achieved through the multi-physics-field sensing network, efficient data processing and analysis are conducted through the heterogeneous data fusion engine, construction quality dynamic evaluation is conducted through the intelligent diagnosis and analysis system, and scientific decision making and construction management are assisted through the visual decision support platform. Therefore, the construction quality is improved, the construction process is optimized, the construction risk is reduced, and comprehensive guarantee is provided for ultra-high performance concrete construction.

The invention discloses ultra-high performance concrete and a preparation method thereof. The ultra-high performance concrete comprises the following components in percentage by mass: 15%-25% of cement, 3%-6% of nano SiO2, 30%-35% of fly ash or steel slag powder, 35%-40% of recycled aggregate, 1%-4% of fiber, 0.5% of a microbial remediation agent and 1%-3% of nano TiO2. The preparation method comprises the following steps: S1, pretreating the recycled aggregate; and S2, packaging the microbial remediation agent: mixing the bacillus pasteurii spores with calcium lactate, and wrapping the mixture in calcium phosphate microspheres. S3, step-by-step stirring; S3.1, dry mixing: uniformly stirring the cement, the fly ash, the nano SiO2, the nano TiO2 and the recycled aggregate; s3.2, wet mixing is carried out, water solution fibers containing the polycarboxylic acid water reducing agent are added, uniform stirring is carried out, and the water-binder ratio of the water solution containing the polycarboxylic acid water reducing agent is 0.18; s3.3, final mixing: adding the packaged microbial remediation agent, and uniformly stirring; and S4, directional curing: performing steam curing at 80 DEG C for 48 hours, performing ultraviolet irradiation, and performing constant-temperature and constant-humidity curing for 7 days. The ultra-high performance concrete has the effects of low cost, low carbon emission, multi-function integration and repeatable crack self-repairing.

The invention discloses a common concrete and ultra-high performance concrete performance prediction and mix proportion multi-objective optimization design method and system, and the method comprises the steps: obtaining a comprehensive data set which covers the mix proportion, performance data and cost data of common and ultra-high performance concrete; correlation analysis is carried out, and influence factors strongly correlated with the target variable are determined; constructing a concrete performance prediction model by using a machine learning algorithm, training and testing, then carrying out interpretability analysis, and selecting an optimal concrete performance prediction model; constructing a mix proportion optimization design objective function and an ultra-high performance concrete cost function; establishing a multi-objective optimization design mathematical model in combination with constraint conditions, a cost function and an optimization objective function; and solving by adopting a multi-objective evolutionary algorithm, generating an approximate Pareto frontier solution set, and determining an optimal mix proportion optimization design scheme. According to the method, the concrete performance can be predicted, the mix proportion with the optimal comprehensive performance and cost effectiveness is obtained, and multi-objective optimization design of the concrete mix proportion is achieved.

The invention discloses shrinkage-free aluminoferrite cement-based ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of novel wall materials, and the shrinkage-free aluminoferrite cement-based ultra-high performance concrete comprises the following components: an activated cementing material, mineralized aggregate, an additive, reinforced fibers and mixing water. Due to the slow release effect of the methyl cellulose coating on the composite expanding agent, precise compensation of self-constriction is achieved, and contraction deformation in the curing and using process is effectively inhibited. Due to the unique mineral composition of the aluminoferrite cement, the early strength of the concrete is sharply improved, and the production cycle of prefabricated parts is greatly shortened. The steel fibers subjected to sand blasting and pre-wrapping modification can effectively bridge microcracks in the concrete and limit crack propagation; the polycarboxylate superplasticizer disperses the modified carbon nanofibers, crack initiation is inhibited from the microscopic level, and mechanical properties such as fracture resistance and impact resistance of the joint part and the prefabricated part are remarkably improved through cooperation of the polycarboxylate superplasticizer and the modified carbon nanofibers.

The invention relates to the technical field of intelligent manufacturing, and particularly provides an intelligent ultra-high performance concrete preparation system and a control system thereof.The preparation system comprises an environment adaptability adjusting subsystem used for automatically adjusting preparation operation parameters of equipment according to external environment temperature and humidity changes of an ultra-high performance concrete mixture; the dynamic optimization proportioning subsystem is used for sensing real-time states of viscosity, fluidity and the like of the ultra-high performance concrete mixture in the preparation process through a built-in sensor array; adjusting a water-cement ratio and an aggregate proportion according to real-time states of preparation operation parameters, viscosity, fluidity and the like; and the operation energy efficiency management subsystem is used for adjusting the working mode of the equipment according to the preparation operation parameters. The control system comprises an equipment layout assembly, an equipment communication assembly and a program execution assembly. While the quality of the ultra-high performance concrete is ensured, the preparation efficiency and the environmental adaptability are improved, the energy consumption is reduced, and green and intelligent production of the ultra-high performance concrete is realized.

The invention provides an ultra-high performance concrete multi-performance prediction method based on machine learning. The ultra-high performance concrete multi-performance prediction method comprises the following steps: Step 1, establishing a data set; step 2, data preprocessing is carried out; step 3, establishing an optimal prediction model: based on the feature subset, adopting a plurality of different machine learning algorithms for training, and selecting the machine learning algorithm with the best training effect as the optimal prediction model; step 4, selecting an optimal feature subset; step 5, explaining the influence of the features on model prediction: calculating the contribution degree of each feature to a prediction result based on the optimal prediction model and the optimal feature subset, and helping to understand the decision process of the model; and Step 6, performance prediction of the ultra-high performance concrete: inputting parameters of the to-be-predicted ultra-high performance concrete into the optimal prediction model to obtain a predicted value of the performance. The technical problems that an existing UHPC performance prediction method is incomplete in data set, insufficient in consideration of data processing and feature engineering and poor in model interpretation can be solved.

The invention provides an ultra-high performance concrete proportion design method based on an intelligent algorithm and functional requirements. The method comprises the following steps: S1, constructing an ultra-high performance concrete performance prediction database; s2, automatically selecting key variables based on function requirements; s3, training and predicting a machine learning model based on function requirements; and S4, optimal design of the ratio of the ultra-high performance concrete. According to the unsupervised anomaly detection method based on the isolation forest, the database is preprocessed, and the ultra-high performance concrete proportion design key variables are selected through the automatic variable selection method, so that rapid mapping from the mixing amount of each component of the ultra-high performance concrete to each function demand index is realized; through the particle swarm optimization (PSO), the ultra-high performance concrete with specific function requirements is subjected to proportioning design, and finally the ultra-high performance concrete proportioning value closest to the function requirement index is obtained, so that the problems of time and labor consumption, low efficiency and resource waste are solved.

The invention belongs to the technical field of concrete, and particularly relates to a preparation method and application of coal gangue-based ultra-high performance concrete UHPC for wet joints. Through composite gradient activation of calcination and ball milling and alkali-lithium salt synergistic excitation, efficient dissolution of active components of the coal gangue is achieved, the 3d compressive strength of the UHPC material is larger than or equal to 120 MPa, the 28d compressive strength of the UHPC material is larger than or equal to 150 MPa, and the UHPC material is improved compared with a traditional coal gangue-based material; meanwhile, through the synergistic effect of nano SiO2 / graphene oxide multi-scale reinforcement and steel fiber toughening, the interface bonding strength reaches 12-14 MPa, the chloride ion diffusion coefficient is smaller than 1.5 * 10 <-12 > m < 2 > / s, and the problems of wet joint interface debonding and durability degradation are solved.

The invention relates to the technical field of ultra-high-performance concrete materials, in particular to a low-carbon gold tailing-based ultra-high-performance concrete material suitable for a large-gradient pavement and a preparation method of the low-carbon gold tailing-based ultra-high-performance concrete material. According to the invention, the multi-stage gold tailings and the machine-made sand are adopted to replace quartz sand in a traditional ultra-high performance concrete material, and a low-carbon cementing material prepared from a large amount of solid waste and a limited early strength activator is adopted to replace traditional high-grade cement with a large mixing amount and is cooperated with a composite admixture and steel fibers; and the low-cost and environment-friendly ultra-high performance concrete material is prepared. The ultrahigh concrete material prepared by the invention has high compressive strength, high breaking strength, high toughness and excellent freezing resistance and chloride ion permeability resistance, and also has the performance of autonomously expanding flow, thereby meeting the construction requirements of cast-in-place of ultrahigh-performance concrete in a large-gradient pavement scene.

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 relates to the technical field of ultra-high performance concrete (UHPC) construction, and discloses an intelligent construction environment adaptive optimization system for uHPC facility construction, which comprises a multi-source heterogeneous sensor network module, an intelligent decision algorithm module, an execution mechanism linkage module, a data closed-loop feedback module and a visual interaction interface module. According to the intelligent construction environment adaptive optimization system for uhpc facility construction, environmental parameters and UHPC hardening data are collected in real time through a multi-source heterogeneous sensor network, and multi-parameter coupling effects of temperature, humidity, wind speed, illumination and the like are accurately analyzed in combination with a multi-input channel modeling and attention mechanism of an improved LSTM neural network, so that the system can be applied to the intelligent construction environment adaptive optimization of the uhpc facility construction. Dynamic threshold value control on environment parameters of all stages of initial setting, final setting and maintenance of the UHPC is realized; the execution mechanism linkage module controls an instruction through cooperation of a three-level early warning mechanism and equipment, the temperature control error is remarkably improved from + / -3 DEG C of a traditional method, and humidity fluctuation is controlled within a smaller range.

The invention relates to the technical field of preparation of building materials, and discloses an ultra-high performance polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete). The superplasticizer composition comprises the following components in parts by weight: 20-30 parts of ethyl acrylate; 20 to 30 parts of sodium acrylate; the invention also provides a preparation method of the ultra-high performance polycarboxylate superplasticizer for UHPC, and the preparation method comprises the following steps: S1, raw material preparation: dissolving ethyl acrylate, sodium acrylate, sodium allylsulfonate, hexadecyl acrylate and diene peroxide in 50-100 parts of water to form a uniform solution; and S2, mixing and pre-polymerizing. By introducing nano silicon dioxide, an ultrasonic dispersion technology and a low-temperature vacuum dehydration technology, the dispersity and anti-permeability of the water reducing agent and the fluidity of concrete are improved, meanwhile, high strength is kept, and the problems that concrete is uneven in performance and poor in constructability are solved.

The invention relates to a low-cost and air-corrosion-resistant steel fiber modification method and application thereof in UHPC, and the steel fiber modification method specifically comprises the following steps: mixing a saturated calcium hydroxide solution with glycerol to obtain a modification liquid, then soaking steel fibers in the obtained modification liquid, standing and modifying, and then drying to obtain the steel fibers. And finally taking out the steel fiber and drying to obtain the modified steel fiber. According to the steel fiber modification method, common industrial raw materials and by-products can be adopted as raw materials, the cost is low, the modification process is non-toxic and harmless, the steps are simple, and industrial application is easy.

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 discloses a special aggregate for high-strength UHPC (Ultra High Performance Concrete) as well as a preparation method and application thereof, and relates to the technical field of nano modification. According to the aggregate, high-strength basalt or quartz sand is used as a matrix, continuous graded particles are formed through a multi-stage crushing process, and the particle morphology and size distribution are optimized. The surface of the UHPC aggregate is modified by adopting a nano composite system, and the interface bonding performance of the aggregate and a UHPC matrix is remarkably improved by forming a gradient nano composite coating. And technological parameters are optimized, so that the uniformity and the performance stability of the coating are ensured. The aggregate can significantly improve the compressive strength, breaking strength and durability of UHPC. In the prefabricated bridge wet joint, the aggregate shows excellent construction performance and rapid maintenance characteristics, and can effectively shorten the construction period and prolong the service life of the structure. According to the invention, a high-performance special aggregate is provided for UHPC through a nano modification technology, and the development of ultra-high performance concrete in engineering application is promoted.

The invention discloses a connector of a wind power concrete tower drum, a tower drum section and a tower drum construction method, the connector comprises a tower drum inner bottom flange and a lower turnup pipe drum, the lower turnup pipe drum is coaxially welded and fixed on the inner wall of the tower drum inner bottom flange to obtain a ring groove, and the ring groove is filled with ultra-high performance concrete. According to the tower tube sections, the connectors are arranged at the upper end and the lower end of a common concrete pipe, and prestressed tendons penetrate through ultra-high performance concrete of the connectors and the common concrete pipe and are locked through prestressed anchorage devices. The construction method comprises the following steps: 1, prefabricating the inner bottom flange and the lower flanging pipe barrel of the tower barrel in a factory; 2, coaxially welding the inner bottom flange of the tower barrel and the lower flanging pipe barrel; 3, a connector is manufactured, and a common concrete pipe is manufactured; 4, hoisting in place in sequence on site; and 5, the prestressed steel bars penetrate through the tower drum sections and are locked through the prestressed anchorage devices. The method has the technical effects that the bearing capacity of concrete tower drum connection is enhanced, the anti-fatigue performance of the concrete tower drum joint and the overall stability of the tower drum are improved, and the construction cost is low.

The invention discloses green low-carbon ultra-high performance concrete with full-granularity steel slag and a preparation method of the green low-carbon ultra-high performance concrete. 800-1000 parts of an ultra-high performance concrete binding material and 1100-1400 parts of full-granularity steel slag are placed in a stirring pot and fully mixed; 2-5 parts of a polyether defoaming agent, 3-10 parts of a C-F-S-H crystal nucleus early strength agent, 15-20 parts of a high-performance polycarboxylate superplasticizer and 144-180 parts of water are added into a stirring pot and fully mixed; and adding 160-190 parts of superfine copper-plated steel fibers into the stirring pot, and fully mixing to obtain the green low-carbon ultra-high performance concrete. According to the green low-carbon ultra-high performance concrete with the full-granularity steel slag and the preparation method of the green low-carbon ultra-high performance concrete, the problems that in traditional UHPC, the consumption of silica fume is large, energy consumption is high, and carbon emission is high are solved.

The invention discloses a UHPC-foam concrete composite material with a sandwich structure and a preparation method of the UHPC-foam concrete composite material. The composite material comprises two ultra-high performance concrete (UHPC) panel layers, a foam concrete sandwich layer of a negative Poisson's ratio three-dimensional framework prepared through a photocuring three-dimensional printing technology is arranged between the two ultra-high performance concrete (UHPC) panel layers, and the three-dimensional framework is of an inward-concave honeycomb topological structure and has the characteristic of transverse expansion after being pressed; impact stress can be effectively dispersed, and a dual energy dissipation path is formed through a synergistic effect with a porous energy absorption mechanism of the foam concrete. The panel layer and the sandwich layer are combined through a layered pouring process, and an interface is subjected to scabbling treatment so as to enhance the bonding strength. The composite material is superior to a traditional material in the aspects of compressive strength and energy absorption performance, is suitable for the fields of anti-explosion buildings, military protection engineering, frontier defense facilities and the like, and has a wide application prospect.

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 construction method for prefabricating and assembling a seabed energy storage tank through prestress, and belongs to the technical field of structural engineering. The energy storage tank comprises a plurality of sub-spherical shell units and prestressed reinforcements. The construction method comprises factory prefabrication and field assembly processes of the plurality of sub-spherical shell units. The sub spherical shell units are made of common concrete or ultra-high performance concrete or ultra-high toughness concrete, PVC or metal corrugated pipes used for allowing prestressed steel bars to penetrate through are pre-buried in the shell framework, and anchorage device positioning grooves are reserved in the edges of the shell framework. A plurality of sub spherical shell units are sequentially spliced on site, high-strength prestressed steel bars are arranged in a pipeline in a penetrating mode and are tensioned in a segmented mode, anchorage devices are installed at the ends of the steel bars for fixing, and an overall spherical structure is formed. And sprayed concrete materials are applied to the joints and the positioning grooves for sealing, so that a closed energy storage spherical tank structure is formed. The method is suitable for an energy storage system in a deep sea high-pressure environment, and has the characteristics of simple and convenient construction process and good structural integrity and water tightness.

The invention discloses a fabricated steel-UHPC external prestressing combined box girder and a construction method and application thereof, and relates to the technical field of bridge engineering, the fabricated steel-UHPC external prestressing combined box girder comprises a prefabricated steel-UHPC combined top plate, a prefabricated steel-UHPC combined bottom plate, a prefabricated steel-UHPC combined web plate, a steel diaphragm plate and an external prestressing system. The box girders are formed by combining prefabricated slabs, the prefabricated web plates are firmly connected with the prefabricated top plate and the prefabricated bottom plate through welded steel plates and post-poured UHPC, and arrangement and tensioning of external prestress are achieved by arranging steel anchor boxes and steering gears in box chambers. According to the combined box girder, the steel and the UHPC are combined to form a structural form that the steel plate is wrapped by the UHPC, and the advantages of high strength, high durability, high toughness, high compactness, low creep and the like of the UHPC and the advantages of high strength, high elastic modulus and weldability of steel are fully utilized, so that the box girder has the advantages of being excellent in structural stress performance, light in overall weight, good in durability, small in later-stage deformation, low in cost and the like. And the hoisting device is especially suitable for bridges in urban rail transit or urban railways.

The application belongs to the field of concrete, and discloses a low-carbon and environment-friendly ultra-high performance concrete and a preparation method thereof.The low-carbon and environment-friendly ultra-high performance concrete comprises the following raw materials in parts by weight: 13-23 parts of water, 50-70 parts of cement, 5-15 parts of silica ash, 100-138 parts of fine aggregate, 20-50 parts of quartz powder, 5-12 parts of reinforcing fiber, 1-5 parts of additive, 0-0.5 parts of calcium polyacrylate (CPA), and 0-0.2 parts of silane coupling agent.The low-carbon and environment-friendly ultra-high performance concrete provided by the application can greatly reduce the dosage of cement, silica ash and other cementitious materials and the dosage of fiber compared with traditional ultra-high performance concrete, but still maintains excellent mechanical properties and durability.

The invention discloses an ultra-high performance concrete material for a bridge structure as well as a preparation method and application thereof, and particularly relates to the field of concrete. The ultrahigh-performance concrete material for the bridge structure is prepared from the following raw materials in parts by weight: 230 to 240 parts of cement, 140 to 150 parts of fly ash, 50 to 60 parts of silica fume, 250 to 260 parts of fine aggregate, 50 to 60 parts of coarse aggregate, 5 to 9 parts of water reducing agent, 80 to 90 parts of steel fiber, 0.03 to 0.08 part of modified graphene, 3 to 5 parts of expanding agent, 1 to 3 parts of viscosity modifier and 70 to 80 parts of water. According to the prepared ultrahigh-performance concrete material for the bridge structure, the viscosity of the ultrahigh-performance concrete is improved, the compressive strength, the breaking strength, the tensile strength and other properties of the ultrahigh-performance concrete are improved, and the application prospect of the ultrahigh-performance concrete material in the concrete for the bridge is expanded.

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 discloses low-shrinkage and impact-resistant ultra-high performance concrete and a preparation method thereof. According to the method, # imgabs 0 is solidified in high-strength porous aggregate to serve as a shrinkage compensation carrier, self-adaption and self-adjustment of the expansion effect are achieved, the problem of uneven expansion is avoided, the total shrinkage value of the prepared ultra-high performance concrete within 28 days is smaller than or equal to 256 # imgabs 1 #, and compared with a traditional UHPC material, the volume stability is improved by 30% or above. According to the invention, the modified short-cut basalt fiber subjected to surface adsorption of a fiber dispersant is added into the premix, so that the three-dimensional uniform dispersion characteristic is further improved, steel fiber (a surface cured lithium silicate layer) can be cooperatively etched to form a multi-scale enhancement system, and through a fiber-matrix interface mechanical occlusion and energy dissipation synergistic mechanism, the drop hammer impact resistance energy is greater than or equal to 45kJ, and the impact resistance is greater than or equal to 350kJ. And the impact resistance is improved by 38.7%.

The invention discloses a stair energy consumption ship collision prevention system based on a metamaterial structure, which comprises an ultra-high performance concrete panel, a stair energy consumption collision prevention layer, a rubber fender, a bridge pier, a bridge bearing platform and a bridge pile foundation, and the stair energy consumption collision prevention layer comprises a variable rigidity unit, a light energy consumption material, a vertical steel plate, an upper top plate and a lower bottom plate, the variable rigidity unit is formed by connecting a plurality of concave hexagonal units through transverse and longitudinal steel plates, and the middle hollow structure is filled with light energy dissipation materials capable of absorbing and dispersing impact energy, such as polyurethane foam, ceramsite and rubber particles. The variable rigidity unit and the steel plates are welded into a whole, and the protection device and the protected pier are connected through a rubber fender. The overall rigidity of the protection device can be increased along with structural deformation when the protection device is impacted, so that the variable-rigidity cascade energy dissipation anti-collision effect is achieved, the ship and bridge collision time can be effectively prolonged, the ship collision force can be effectively reduced, and bidirectional protection of the ship and the bridge is achieved.

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 relates to an ultrahigh-performance grouting material for an offshore wind power jacket in a low-temperature environment and application of the grouting material. The grouting material is prepared from 25 to 40 parts of cement, 32 to 45 parts of fine aggregate, 1 to 10 parts of early strength agent, 5 to 15 parts of superfine mineral admixture, 0.1 to 1 part of expanding agent, 0.01 to 0.5 part of early strength type powder water reducing agent, 0.1 to 1 part of defoaming agent, 0.01 to 0.15 part of retarder and 0.1 to 5 parts of steel fiber. The low-temperature cement-based grouting material has the beneficial effects that the low-temperature cement-based grouting material with ultrahigh mechanical property and 28-day uniaxial tensile strength is prepared through the synergistic effect of cementing material mineral reconstruction and aggregate grading design; moreover, when the cement-based grouting material is applied, the cement-based grouting material only needs to be directly mixed with mixing water, secondary stirring and premixing are not needed, and the stirring time is short.