1088 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 relates to the technical field of concrete detection, in particular to a dynamic detection and analysis method and system for early performance of ultra-high performance concrete. According to the technical scheme, the method comprises the steps of establishing a raw material characteristic spectrum library based on multi-physics field coupling, constructing a dynamic detection array based on a time sequence, developing a multi-modal data fusion algorithm, establishing a nonlinear coupling effect decomposition model and implementing dynamic parameter inversion. According to the method, a technical chain of four-dimensional monitoring network-multi-physics field coupling analysis-cross-scale prediction-adaptive regulation and control is constructed, so that dynamic accurate detection and intelligent regulation and control of the early performance of the ultra-high performance concrete are realized, and the technical bottlenecks of a traditional method in the aspects of parameter coupling, cross-scale association and real-time regulation and control are solved; the early performance prediction precision and the maintenance efficiency are remarkably improved, the cracking risk is reduced, and reliable technical support is provided for application of the ultra-high performance concrete in major engineering.

The invention discloses high-toughness ultra-high performance concrete and a preparation method thereof, and relates to the technical field of polymer modified materials thereof. The concrete is composed of a cementitious material composite system, a fiber-reinforced system and a polymer modifier, the cementitious material comprises Portland cement, nano-silica, a rice hull ash-based auxiliary cementitious material and gradient grading quartz powder, and the fiber system adopts steel fiber / basalt fiber / polypropylene fiber multi-scale composite reinforcement. And a polyurethane emulsion interface modifier is matched. During preparation, a dry mixing-fiber dispersion-wet mixing three-stage process is combined with a microfluidization emulsification and segmented polymerization technology, so that uniform dispersion of fibers and matrix-fiber interface reinforcement are realized. The scheme has high strength, high toughness and industrial feasibility, and is suitable for harsh engineering scenes such as bridge joints and explosion-proof structures.

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 relates to the technical field of ultra-high performance concrete, particularly discloses a fatigue performance evaluation method for a steel-UHPC combined bridge deck slab, and is used for solving the problem that the fatigue damage evolution process of the steel-UHPC combined bridge deck slab in the life cycle is difficult to accurately predict due to the fact that an existing evaluation method does not consider the influence of structural fatigue performance degradation. And the evaluation result is likely to be unsafe. According to structural parameters and material attributes of a reinforced UHPC layer, fatigue performance evaluation of a reinforced UHPC component under the action of an axial tension fatigue load is carried out, fatigue performance analysis of a stud connecting piece in ultra-thin UHPC under the action of a shear fatigue load is carried out, bending fatigue performance analysis of a steel-UHPC-pavement composition board is carried out based on a five-point bending test, and the bending fatigue performance of the steel-UHPC-pavement composition board is analyzed. And a time-varying fatigue analysis framework of the steel-concrete composite effect degraded steel-UHPC composite bridge deck is established, so that the evaluation result is more reliable, and the risk of unsafety is reduced.

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 relates to a low-carbon phase change energy storage UHPC (Ultra High Performance Concrete) and a preparation method thereof. The low-carbon phase change energy storage UHPC comprises the following components in parts by weight: 1400 parts of cement, 320-400 parts of fly ash, 200-280 parts of silica fume, 400-480 parts of water, 1200 parts of machine-made sand, 1700 parts of phase change aggregate, 2 parts of modified carbon fiber, 20 parts of a polycarboxylic acid high-performance water reducing agent, 2 parts of a composite thickening time control agent and 1 part of sodium polyacrylate. The preparation method comprises the following steps: weighing materials; preparing concrete 1: preparing a mixed solution 1; stirring the concrete 1; preparing concrete (2); preparing mixed liquid (2); stirring the concrete (2); and pouring concrete, vibrating and curing. According to the method, UHPC shrinkage control is carried out by adopting a multi-dimensional crack control method, and penetrating cracks and deep cracks are prevented from being generated in a concrete structure; the provided phase change energy storage UHPC has the heat storage and release capacity, the indoor temperature can be adjusted, and resource energy consumption is reduced.

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 an ultra-high performance concrete compressive strength prediction method based on a grey wolf optimization algorithm. The method mainly solves the technical problem that it is difficult to comprehensively, accurately and efficiently predict the compressive strength of the ultra-high performance concrete through existing empirical formulas or numerical simulation. According to the method, the initial threshold value and the weight value of the BP neural network model are optimized through the grey wolf optimization algorithm (GWO), the problem that the model falls into local optimum can be effectively avoided, then the robustness and generalization ability of the model are improved, and the prediction precision is higher. And the SHAP feature importance method is adopted to identify the feature which contributes the greatest to the prediction result, so that the simplification of the quantity of variables is realized, the redundancy caused by potential correlation among the variables is avoided, the extracted input variables have the minimum redundancy, and the prediction accuracy and the prediction efficiency of the neural network model are effectively improved after parameter optimization.

The invention belongs to the technical field of building materials, and particularly discloses maintenance-free lightweight spraying ultra-high performance concrete as well as a preparation method and application of the maintenance-free lightweight spraying ultra-high performance concrete. Comprising 700 to 900 parts of Portland cement, 120 to 200 parts of silica fume, 100 to 200 parts of a layered mineral admixture, 30 to 70 parts of a gradient active expanding agent, 600 to 800 parts of modified lightweight aggregate, 0.5 to 3 parts of a rheology regulating agent, 40 to 80 parts of composite fiber, 7 to 10 parts of a water reducing agent and 170 to 200 parts of water. Based on the synergistic effect of all the components, on the basis that the light ultra-high performance concrete can be continuously sprayed, the spraying performance, the shrinkage performance and the interface bonding performance are further improved, the anti-cracking performance, the mechanical performance and the durability of the light ultra-high performance concrete are enhanced, formwork erecting, film covering maintenance and later maintenance are not needed in construction, and the construction period is shortened. And moreover, the coating has the advantages of small apparent density, strong interface adhesion, thick single-time spraying, high crack resistance, low shrinkage, ultrahigh strength, high durability and the like.

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 cement-based building materials, in particular to an ultra-high-performance grouting material for an offshore wind power jacket and a preparation method and application of the grouting material. Cement, fine aggregate, corundum micro powder, a superfine mineral admixture, a reinforcing agent, a reinforcing accelerant, an expanding agent, a water reducing agent, a defoaming agent and steel fibers are adopted as raw materials; the grouting material for the offshore wind power jacket, which is high in compressive strength and good in tensile strength and ultimate elastic tensile strength, is prepared by utilizing the compatibility of the superfine mineral admixture, the reinforcing agent and the reinforcing accelerant and cooperating with the steel fibers.

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 cement-based building materials, in particular to low-shrinkage ultra-high-performance concrete and a preparation method thereof.The concrete production cost is reduced by replacing cement with a large amount of admixture, ardealite-based coarse aggregate and solid waste lightweight aggregate are prepared from industrial solid waste to serve as aggregate, and the concrete strength is improved; the internal curing effect is achieved, and the shrinkage of the ultra-high performance concrete is reduced together with a self-made expanding agent.

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 provides a phosphogypsum lightweight aggregate and a preparation method thereof. The phosphogypsum lightweight aggregate disclosed by the invention can be applied to mass concrete engineering, the utilization rate of sandstone is effectively reduced, and the ecological environment is protected. Meanwhile, the cylinder compressive strength of the prepared lightweight aggregate can reach 10 MPa or above, the apparent density is 1600-1920 kg / m < 3 >, the water absorption rate is 9-14%, when the lightweight aggregate acts in concrete, ultra-high performance concrete with the strength grade reaching 100 MPa or above can be prepared, and the hydration shrinkage condition of the concrete can be reduced while certain strength is kept. The method applied to engineering construction not only helps to solve the national problems of high consumption and utilization of ardealite and pollution prevention, but also can solve the shortage of materials required by infrastructure construction. Compared with common concrete, the concrete has higher market competitiveness.

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 present application provides a split bolt, which relates to the field of building technology. The split bolt comprises: a base and a plurality of split parts, the split parts comprising a first part and a second part, one end of the first part is connected to the second part, the other end of the first part is connected to the base, the first parts of the plurality of split parts and the base constitute a bolt rod, the second parts of the plurality of split parts constitute a bolt cap, and there is a gap between adjacent split parts, and the gap is filled with an elastic partition material. The split bolt greatly improves the shear strength of the bolt by increasing the diameter of the base, meeting the shear force requirements between steel and high-strength or ultra-high performance concrete. The upper split part is used to meet the requirement that "the length of the weld of the cylindrical head welded nail connector should not be less than 4 times its rod diameter", and maintain good ductility. It has the advantages of avoiding the group nail effect, convenient construction, reducing the number and height of the bolts, and increasing the shear bearing capacity without reducing the ductility.

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 a connecting joint for vertical steel bars of a prefabricated panel by adopting UHPFRC (Ultra High Performance Fiber Reinforced Concrete) lap joint, and belongs to the technical field of building structures. The connecting joint comprises a first prefabricated wall panel and a second prefabricated wall panel, wherein the first prefabricated wall panel comprises a connecting hole and a first connecting steel bar; the second prefabricated wallboard comprises second connecting steel bars, the first connecting steel bars and the second connecting steel bars are arranged in the connecting holes at intervals, and UHPFRC is poured into the connecting holes. The connecting holes are formed in the horizontal joints of the bottoms or the tops of the prefabricated wall panels, the connecting steel bars are arranged in the connecting holes, the connecting steel bars extending out of the prefabricated wall bodies adjacent to the horizontal joints are in single-row or double-row lap joint in the connecting holes by pouring the UHPFRC, and therefore formworks and sleeves / casing pipes are omitted, and the construction cost is reduced. The construction technology of vertical steel bar connection in the fabricated shear wall is obviously simplified, and the connection cost is reduced.

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.