76 results about "Wet dry cycle" patented technology

The invention relates to an iron tower foundation safety analysis method considering the dry-wet cycle effect. The method comprises the following steps that 1, a soil body strength degradation constitutive model is established; 2, determining iron tower foundation structure parameters and soil body parameters; 3, establishing an iron tower foundation-soil body three-dimensional geometric model by utilizing three-dimensional modeling software and rock-soil finite element simulation software; 4, applying a load transmitted to the iron tower foundation by the power transmission iron tower in the iron tower foundation-soil body three-dimensional geometric model, defining initial parameters, and establishing a rainwater seepage and dry-wet cycle coupling effect analysis model; 5, analyzing and predicting the cycle index when the safety coefficient of the iron tower foundation is reduced to a threshold value from the two aspects of tower foundation ultimate bearing performance and iron tower foundation-soil body interaction on the basis of a rainwater seepage and dry-wet cycle coupling effect analysis model; according to the method, an efficient and accurate numerical analysis means can be provided for safety assessment of the power transmission tower foundation in the collapsible loess area.

The invention relates to the technical field of concrete durability evaluation, in particular to a compound green concrete salt freezing resistance durability evaluation system under a frozen soil environment, which comprises a data input unit, a decision information table storage unit, a rough set analysis processing unit and an evaluation output unit, the data input unit receives a sample data set containing freeze-thaw cycle times, dry-wet cycle times, freeze-thaw-dry-wet cycle times, long-term soaking time, composite salt concentration, gas content and fly ash mixing amount, and the decision information table storage unit stores a decision information table constructed based on a rough set theory. The influence factor combination and the relative dynamic elastic modulus percentage are associated, the rough set analysis processing unit establishes a mapping relation through attribute reduction and rule extraction and quantifies the weight of each factor, and the evaluation output unit outputs a relative dynamic elastic modulus predicted value, durability grade classification and key factor contribution sorting. And the salt freezing resistance durability of the concrete under the multi-factor coupling effect is accurately evaluated.

The utility model relates to the technical field of water and soil conservation, and particularly discloses an ecological slope protection water and soil conservation device. Comprising grating blocks arranged on the surface of a soil layer of the ecological slope protection, the adjacent grating blocks are connected through mortise and tenon joint structures, and a plant protection area is formed in a central grating groove of each grating block; and the separating and positioning assembly is arranged in the soil layer on the lower side of the grating block, vertically penetrates through the slope protection floating soil layer and extends to the bearing layer. Through the arrangement of the grating blocks, the adjacent grating blocks are spliced through mortise and tenon joint structures, and an integral protective layer is formed on the surface soil layer of the ecological slope protection. And through the arrangement of the separating and positioning assemblies, the lower soil body can be divided into independent units, and the independent units are matched with the upper grating blocks to form a three-dimensional water and soil conservation frame, so that the overall stability of the slope protection is enhanced, and local water and soil loss and diffusion are prevented. The problems that a traditional slope protection structure is poor in synergistic protection effect and continuous water and soil conservation function, and interlayer slippage is likely to be generated under the long-term dry-wet cycle effect are solved.

The invention provides a dangerous rock degradation and collapse simulation test system and method under a multi-field coupling effect, and the system comprises a flexible stress loading device which provides a vertical stress for a dangerous rock mass sample to enable the sample to have the same stress level as a natural state; a dangerous rock mass sample is used for simulating various collapse modes by controlling the angle of a soft belt and a hollowed-out area; the corrosion device is used for providing a dry-wet cycle and osmotic pressure environment for the dangerous rock mass sample; the data acquisition device is used for recording surface displacement, acoustic characteristics and external factors of the rock mass along the soft zone; the damage degree calculation device is used for calculating the damage degree of the dangerous rock mass under multi-field coupling; the safety coefficient calculation device is used for obtaining the safety coefficient of the dangerous rock mass under multi-field coupling; and the safety evaluation device is used for constructing an evaluation model and evaluating the safety state of the dangerous rock mass. According to the method, collapse simulation caused by degradation of the soft belt under the multi-field coupling effect is achieved, and the problems of early-stage safety evaluation and graded early warning of dangerous rock instability based on multi-index fusion are solved.

The invention relates to the technical field of high polymer materials, in particular to a single-component polyurethane grouting reinforcement material as well as a preparation method and application thereof. According to the reinforcement material, polymethylene polyphenyl polyisocyanate, epoxy resin, low-functionality polyether polyol, high-functionality polyether polyol and polyester polyol are mainly used as raw materials, the adding proportion of all the raw materials is adjusted in a targeted mode, and the prepared single-component polyurethane grouting reinforcement material permeates into a permafrost region roadbed structure; the permeable material-soil stone body formed by chemical reaction with roadbed moisture has the properties of high strength and toughness, good freeze-thaw resistance, good dry-wet cycle property and low heat release. According to the formula system, the contradiction between high strength and low heat release in the traditional technology is successfully solved through the fine matching and synergistic effect of all the components, and an unexpected technical effect is achieved.

The utility model provides a pre-stressed anchor cable axial force loss and anchoring force deterioration test device under dry-wet cycle, which comprises a test water tank for accommodating a standard rock mass test block; the water injection and drainage device is arranged on the test water tank and used for controlling water level change in the water tank; the anchoring structure is composed of an anchor cable implanted into a preset hole channel of the rock mass test block and a grouting body poured between the preset hole channel and the anchor cable; the strain gauges are arranged at intervals in the axial direction of the anchoring section of the anchor cable; the pressure gauge is sleeved on the anchor cable; the plurality of hygrometers are buried in the grouting body; the strain gauges, the hygrometer and the pressure meter are connected with the data acquisition instrument through cables; and the heating assembly is arranged in the rock mass test block and the test water tank and is used for simulating a temperature change environment. According to the invention, the simulation of the dry-wet cycle working environment of the rock mass test block is realized, the drying process of the rock mass test block is accelerated through the heating assembly, the test time consumption is shortened, meanwhile, the hygrometer is matched to accurately control the dry-wet index of the test sample, and the accurate and controllable test variable is realized.

The invention discloses a chitin-silicon-calcium-based modified material for rammed earth wall repair and a weather resistance evaluation method thereof, and belongs to the technical field of rammed earth wall repair, the chitin-silicon-calcium-based modified material comprises metakaolin, calcium oxide, quartz and chitin; the ratio of chitin to metakaolin to calcium oxide to quartz is 1: 1: 2: 4; the method comprises the following steps: pre-treating at the earlier stage of a test, evaluating freeze-thaw cycle performance, evaluating dry-wet cycle performance, evaluating salt corrosion resistance, analyzing association between a microstructure and a strength performance, and finally, revealing a material degradation rule and mechanism by combining scanning electron microscope observation, unconfined compressive strength test and crack rate analysis. When the freezing and thawing cycle number N is less than or equal to 5, the dry and wet cycle number I is less than or equal to 9, and the salt solution concentration c is less than or equal to 0.3 mol / L, the characteristics of freezing and thawing resistance, dry and wet resistance, salt erosion resistance and the like of the modified material are obviously improved; after the modified material is added, internal pores of plain soil can be filled, unconfined compressive strength of a soil body is enhanced, and long-term durability of the soil body is improved.

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

The application discloses a kind of equipment for studying the stability of MICP mineralization product under dry-wet-freeze-thaw cycle, comprising: soil column test unit, refrigeration cycle system, heating cycle system, temperature monitoring system and water injection unit;Soil column test unit includes temperature guide plate, soil column sample cylinder, heat preservation layer and water permeable plate;Refrigeration cycle system includes refrigeration device, cooling liquid inlet pipe and cooling liquid outlet pipe;Heating cycle system includes heating device, hot liquid inlet pipe and hot liquid outlet pipe;Temperature monitoring system includes temperature sensor and data acquisition equipment;Water injection unit includes water storage tank and peristaltic pump;Soil column sample cylinder is also provided with water outlet for discharging water in soil column sample cylinder.The equipment can simulate the dry-wet and freeze-thaw cycle environment of soil column sample, obtain the stability parameters of soil column sample under the action of dry-wet cycle and freeze-thaw cycle alone or coupling, and evaluate the stability effect of MICP technology in repairing heavy metal pollution, providing theoretical and practical basis.

The invention belongs to the field of inorganic mineral functional materials, and provides a pH-responsive tannic acid / attapulgite composite microsphere and a preparation method thereof. According to the preparation method, the design that epoxy silane grafted attapulgite and tannic acid are subjected to ring opening on epoxy groups through phenolic hydroxyl groups to form C-O-C covalent bond anchoring is adopted, and then spray drying and balling are performed to prepare the composite microspheres, so that low-viscosity atomized processing, controllable particle size balling and excellent mechanical stability and dry-wet cycle stability under the high-solid-content feeding condition are realized; the prepared inorganic mineral-polyphenol composite particles have high processability and mechanical stability and pH response water absorption performance, the problems that traditional inorganic mineral-polyphenol composite particles are difficult to give consideration to coupling contradiction between processability and mechanical stability and performance consistency is insufficient during metal coordination treatment are solved, and the inorganic mineral-polyphenol composite particles have wide application value in the fields of intelligent adsorption materials, environment response type functional fillers and the like.

The application discloses a kind of wet and hot marine environment under power transmission equipment surface condensation amount calculation method and device, it is related to power transmission equipment humidity management technical field, wherein method includes: obtaining the temperature and relative humidity parameters of the environment where target power transmission equipment is located, into salt moisture dissociation corrected condensation generation condition criterion, whether to meet condensation generation condition is judged, not meet then terminate calculation, meet then enter subsequent process;Based on salt moisture dissociation effect, through the surface tension of salt solution and equivalent curvature radius double correction, construct condensation amount calculation equation, enter environmental parameter and obtain the condensation amount of moisture dissociation correction after solution;Combining the salt density deposition amount and contact angle change caused by wet and hot marine environment dry-wet alternation, based on the salt space redistribution characteristics complete salt density dynamic correction, into parameter calculation dry-wet cycle condensation amount, realize the quantification of equipment surface condensation amount.The application realizes the accurate calculation of condensation amount, while guaranteeing long-term service of marine power transmission equipment.

The invention discloses a reservoir area rock slope model test device and method, and relates to the field of slope model tests. The wave making module, the dry-wet cycle module and the water level control module are arranged in the rock slope model, the dry-wet cycle effect and the reservoir area wave erosion effect caused by water level change can be truly simulated, and the mechanical response and deformation conditions of rock slope rock mass in the reservoir area in the water level dynamic change process are truly reflected; according to the non-intrusive continuous testing device and method, the evolution process of dry-wet cycle and erosion coupling effect reservoir area rock slope slippage can be studied by simulating water level changes, slope rock mass dry-wet cycle and wave erosion; according to the invention, the complex and changeable water level change condition in the reservoir area rock slope can be accurately simulated, the coupling effect of erosion and dry-wet cycle is considered, and automatic control is realized to a certain extent.

The invention discloses a frozen soil tunnel support optimization control method and system based on digital twinning and reinforcement learning. The system comprises a multi-source monitoring unit, an intelligent support unit, an environment regulation and control unit, an intelligent drainage and humidity regulation unit, a digital twinborn control and prediction unit and a control and communication unit. The multi-source monitoring unit obtains multi-field information of the tunnel surrounding rock and the supporting structure; the digital twinning control and prediction unit is used for constructing a multi-physics field digital twinning model capable of being updated online, defining a comprehensive evaluation function and generating a control strategy of each partition under security constraints by adopting a reinforcement learning algorithm; the intelligent supporting unit achieves prestress self-adjustment and crack self-healing through a shape memory alloy anchor rod, a phase-change temperature-adjusting lining layer and a self-healing protection layer, and the intelligent drainage and humidity adjusting unit combines drainage, heat tracing and humidity control to reduce ice blockage and dry-wet cycle damage. The system can obviously improve the support safety of the frozen soil tunnel and reduce the operation energy consumption.

This invention discloses an ultra-long service life concrete and its preparation method, belonging to the field of building materials technology. The ultra-long service life concrete, by weight, comprises the following raw materials: 800-1000 parts of cementitious material, 1400-1600 parts of aggregate, 10.5-19 parts of admixture, 20-30 parts of toughening fiber, 0-20 parts of steel fiber, 6-11 parts of PVA fiber, and 160-200 parts of water; the toughening fiber is selected from fibers with a shrinkage rate of 4%-10% at 55-75℃. The concrete of this invention has a service life ≥120 years, a compressive strength ≥80 MPa, withstands ≥500 wet-dry cycles, exhibits excellent crack resistance, corrosion resistance, and impermeability, has widely available components, a simple process, and can be industrially produced. It is suitable for major infrastructure projects and can significantly reduce maintenance and reinforcement costs.

The invention relates to the technical field of experimental equipment, in particular to a full-automatic control dry-wet cycle experimental device, which is characterized in that dry-wet parameters are set through a controller, a water suction pump is controlled by the controller to automatically inject water into an experimental barrel, and the interior of the experimental barrel is vacuumized by an air exhauster to realize sample soaking; after the set soaking time is reached, the controller controls the electromagnetic valve on the drainage pipe to be opened, water in the experiment barrel flows back to the water storage barrel through the drainage pipe, then the controller controls the heating tray to heat and dry the sample, and the space where the heating tray is located is vacuumized by the air extractor, so that water vapor of the sample is conveniently discharged, and the drying effect of the sample is ensured; and after the set drying time is reached, soaking the sample again. And repeating the steps to realize automatic control of the dry-wet cycle. When the device is used for carrying out a dry-wet cycle test, the alternate dry environment and wet environment do not need to be manually operated, and the test time can be accurately controlled.

The invention relates to the field of civil engineering materials, in particular to a method for rapidly determining the sulfate resistance grade of concrete based on mineral components of a cementing material, and the method specifically comprises the following steps: (1) detecting the content beta of C3A; (2) manufacturing a concrete test piece; (3) performing a dry-wet cycle test; (4) calculating a test result: performing regression analysis by using a function Kf2 = exp (a + b * t + c * t2) to obtain values of parameters a, b and c in a regression equation; and (5) calculation of the sulfate resistance grade: according to a calculation formula: Kf1 = exp (a-0.0675 + (b + 0.0009) * t + (c + 3.1038E (-5)) * t2), enabling Kf1 in the formula to be 75%, solving a t value, and taking the t value down to be thirty, thereby obtaining the sulfate resistance grade of the to-be-measured concrete.The method can be used for rapidly measuring the sulfate resistance grade of the concrete on the premise of ensuring the accuracy.

The application relates to the technical field of electric wires and cables, and discloses a high-elasticity waterproof cable based on water-blocking powder and elastomer blending, which aims to solve the problem that, in the prior art, interlayer separation is easily caused by interface stress superposition during long-term dynamic service, leading to elastic attenuation and damage of a waterproof barrier; the sodium polyacrylate water-blocking powder is modified by compounding, is blended with an elastomer matrix, is matched with modified nano-silica dispersion, a gradient insulation structure of inner and outer layers is designed, and processes such as ultrasonic dispersion, nitrogen protection steam crosslinking, etc. are combined; the cable is sequentially provided with a conductor layer, a conductor shielding layer, a gradient insulation layer, an insulation shielding layer and a sheath layer from inside to outside, interface stress concentration is reduced, interlayer combination stability is enhanced, the cable can still maintain excellent elastic recovery capability and waterproof barrier integrity under high-frequency torsion and repeated dry-wet cycles.

The invention discloses an impermeable material for geotechnical engineering construction and a preparation method thereof, and relates to the technical field of geotechnical engineering, the impermeable material is prepared from the following raw materials by weight: 10-16 parts of sulphoaluminate cement, 1-3 parts of ash calcium powder, 0.8-1.2 parts of incense ash, 0.3-0.5 part of single-layer graphene oxide sheet, 15-25 parts of fly ash, 3-5 parts of rosin-based hyperbranched epoxy resin, 3-5 parts of (3, 4-dichlorophenyl)-1, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3-5 parts of (3, 4-dichlorophenyl)-1, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate The invention discloses a high-temperature-resistant coating which is prepared from the following components in parts by weight: 1-3 parts of 2, 4-diaminoacridine-9-yl) boric acid, 1-3 parts of double-end epoxy silicone oil, 2-3 parts of a dispersing agent, 1-3 parts of 2, 4-diamino-6-phenyl-1, 3, 5-triazine, 0.2-0.4 part of a fiber material, 1-2 parts of citrus pulp powder and 5-8 parts of water. The material is high in compressive strength, remarkable in anti-seepage effect, excellent in acid, alkali and salt resistance and dry-wet cycle resistance, sufficient in frost resistance and long in service life.

The application discloses a kind of building solid waste-red clay mixed roadbed filler permanent deformation estimation model and modeling, estimation method, the maximum dry density, optimum moisture content and CBR value of building solid waste-red clay mixed roadbed filler under different building solid waste incorporation rate are determined by compaction test, California bearing ratio test;Prepare the building solid waste-red clay sample of different building solid waste incorporation rate, carry out dry-wet cycle test to it, carry out triaxial test to the sample after preset dry-wet cycle number, determine its resilience modulus and permanent deformation;Establish the elastic deformation increment estimation model considering building solid waste incorporation rate, dry-wet cycle number comprehensively, and then obtain the permanent deformation estimation model considering stress-strain relationship, physical state, cycle loading number, building solid waste incorporation rate, dry-wet cycle number comprehensively, then the permanent deformation of building solid waste-red clay mixed roadbed filler is accurately and quickly estimated using the permanent deformation estimation model.

The invention relates to the technical field of shear tests, and discloses a combined shear box for a soil body sample under the action of a dry-wet cycle and a test method. Wherein the shearing box comprises a dry-wet circulation mold, a shearing outer box, a sample, a permeable stone, a bearing plate and steel balls, the dry-wet circulation mold comprises an upper mold body inner frame, a lower mold body inner frame, an upper permeable frame, a lower permeable frame, a rolling row and a pressing screw, and the shearing outer box comprises an upper shearing outer box and a lower shearing outer box; and the upper shearing outer box and the lower shearing outer box are respectively provided with a left force transmission connecting end and a right force transmission connecting end. According to the invention, a plurality of samples can be subjected to dry-wet circulation synchronously, the test arrangement is optimized, the manufacturing cost is obviously reduced, the problem that the sample structure is damaged in the transfer and water adding process in the traditional method is effectively solved, the test accuracy and reliability are improved, and the test efficiency is improved. The design of the permeable frame, the drainage channel and the water outlet hole accelerates the wetting and drying process of the sample, and shortens the total test time.

The application relates to the technical field of civil engineering materials, and discloses a filler for red-layer soft rock roadbed and a preparation method thereof. The method comprises raw material pretreatment, step-by-step composite mixing, stabilization treatment and vibration compaction forming. Through accurate progressive control of the step-by-step composite mixing process, mechanical interlocking fusion of coarse aggregate strengthening components and red-layer soft rock fragments is first realized, then an active curing agent is introduced to activate deep reaction, and finally molecular-level coating of a hydrophobic modification material is realized, so that the problem of weak interface bonding caused by uneven mixing of components in traditional processes is solved, a continuous three-dimensional network structure is formed in the filler, and the overall deformation coordination and structural compactness are improved; through dynamic balance of temperature field distribution, the risk of molecular chain rupture caused by heat accumulation in local areas is inhibited, so that the filler still maintains stable hydrophobic properties and volume integrity under an extreme dry-wet cycle environment.

The invention relates to the technical field of building materials, in particular to a method for reducing microcracks of recycled aggregate based on pre-infiltration treatment, which comprises the following steps: pre-infiltrating high-strength concrete recycled aggregate by using a saturated lime aqueous solution, calculating the number N of dry-wet cycles according to the crack width, and carrying out quantitative treatment on the number N of pre-soaking times, the controllability and repeatability of the recycled aggregate treatment process are remarkably improved, microcracks on the surface of the recycled aggregate are sealed after treatment, and then the long-term performance of recycled aggregate concrete is improved.

The application provides a landslide rock mass crack repair device and method based on calcium carbonate precipitation, and belongs to the technical field of geotechnical engineering geological disaster prevention and control. The device integrates precise grouting, precipitation regulation, mechanical monitoring, dry-wet cycle simulation module and intelligent control terminal, adopts a degradable multi-stage telescopic grouting pipe, combines electric field, pH and temperature for precise regulation to realize directional precipitation of calcium carbonate crystals, and is matched with multiple types of sensors to complete real-time monitoring of all parameters in the repair process. The method configures MICP / EICP precursor liquid according to the rock mass lithology, and completes the repair through the steps of crack survey, environment calibration, precursor liquid mixing, precise grouting regulation, simulation maintenance and effect evaluation, and is suitable for different scenes such as reservoir area, mountain area, mining area and high altitude. The application realizes intelligent and quantitative evaluation of the repair process, can improve the compressive strength and shear strength of the rock mass, is convenient to construct and has little disturbance to the original rock mass, the long-term mechanical stability of the repaired rock mass is excellent, and is suitable for various landslide rock mass crack repair projects.

The application discloses a loess tunnel surrounding rock pressure prediction method and system, and belongs to the technical field of tunnel construction, which can solve the problem that the prior art cannot be applied to the surrounding rock pressure prediction in water-rich loess stratum. The method comprises the following steps: performing triaxial compression tests on multiple samples of the soil body of the loess tunnel surrounding rock under different dry-wet cycle times; determining a first mapping relationship between the shear strength index of the soil body and the dry-wet cycle times and a second mapping relationship between the vertical strain of the soil body, the vertical test pressure and the dry-wet cycle times according to the test data; performing numerical simulation on the dry-wet cycle process of the loess tunnel surrounding rock under different working conditions based on the first mapping relationship and the second mapping relationship, so as to obtain the surrounding rock simulation pressure before and after the dry-wet cycle of different times under each working condition; and determining the surrounding rock prediction pressure after the dry-wet cycle of different times under each working condition according to the surrounding rock simulation pressure. The application is used for predicting the surrounding rock pressure.

The invention discloses a dry-wet cycle steel slag carbonization method and system based on dynamic moisture regulation and control, and aims to solve the problem of volume stability of steel slag caused by free calcium oxide and free magnesium oxide, and the defects of long aging period and large occupied area of the existing natural stacking and the defects of high water consumption, high energy consumption, complex equipment and poor compatibility with a storage yard in the existing carbonization technology. The method comprises the following steps: constructing a water content dynamic monitoring model based on the saturated water content of the steel slag; pre-wetting the steel slag pile to a target water content; and under normal temperature and normal pressure, placing the materials in a carbonization environment compatible with an industrial storage yard in a natural accumulation state, dynamically adjusting the water supplementing amount based on a target and the current water content, and periodically supplementing water to form a dry-wet cycle until carbonization is completed. The system comprises a moisture content monitoring module, a pretreatment module, a carbonization reaction module, an environment control module, a CO2 supply module and a moisture supplement module. The method shortens the treatment period, reduces water consumption and energy consumption, is compatible with existing facilities, adapts to the steel slag with any particle size, and provides a low-cost and easy-to-land scheme for large-scale recycling of the steel slag.

The invention discloses a nondestructive acquisition method for the carbonization depth of a concrete structure under a dry-wet cycle condition in a salt-fresh water area, and the method comprises the steps: collecting the carbonization depth influence data and ultrasonic detection data of the concrete structure through arranging various types of sensors, and forming an initial data set; preprocessing the initial data set, performing data compensation on the non-uniform carbonization region, generating a pore structure-carbonization depth joint feature, and outputting a carbonization feature recognition set based on the joint feature; a concrete structure carbonization diffusion path is obtained according to the carbonization feature recognition set, a carbonization degree evaluation map is generated, a carbonization expansion space is obtained, and a concrete structure safety service set is generated according to the carbonization expansion space; and in combination with the safe service set and the carbonization depth influence data, determining a carbonization acceleration trend, and outputting a concrete structure carbonization depth record according to the carbonization acceleration trend. Various factors influencing concrete carbonization are comprehensively considered, and lossless acquisition of the carbonization depth of the concrete structure under the dry-wet cycle condition in the salt-fresh water area is realized.

This utility model discloses an intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device, belonging to the field of reinforced concrete corrosion testing equipment. It includes a test chamber body and a DC power supply. The test chamber body has a test area, with at least one test rack within the test area. Multiple atomizing nozzles are located above the test racks, and fans are installed on the side walls of the test area. Specimens are placed on the test racks, and stainless steel wire is wound around the surface of the specimens. The positive terminal of the DC power supply is connected to the end of the reinforcing steel bar inside the specimen, and the negative terminal is connected to one end of the stainless steel wire. This utility model combines electrochemical acceleration and dry-wet cycle functions, has a high degree of intelligence, can simulate a real corrosion environment, significantly improves testing efficiency and result reliability, and is suitable for the study of corrosion performance of various materials and components.

The invention provides a device and a method for testing a long-time mechanical property degradation process under a dry-wet cycle. The device comprises a triaxial pressure chamber, a loading system, a gas-liquid reactor, an inlet dew point sensor, an outlet dew point sensor, a vacuum pump and a tail liquid pump. The gas-liquid reactor is used for preparing gas-liquid mixtures with different humidity by adjusting the temperature and the gas-liquid ratio and conveying the gas-liquid mixtures to the triaxial pressure chamber; the double-path dew-point sensor is used for monitoring the humidity of a sample inlet and a sample outlet in real time so as to judge the internal humidity balance. During testing, the system is firstly vacuumized, sample humidity balance pretreatment is performed, and then a graded loading creep test under constant humidity is selected, or a dry-wet cycle creep test is performed by regulating and controlling a gas-liquid reactor under constant stress. According to the device and the method, synchronous coupling of stress loading and an accurate and controllable dry-wet cycle environment is realized, the dynamic degradation rule of mechanical parameters of a geotechnical material under the combined action of long-term loading and dry-wet alternation can be accurately revealed, and an effective test and analysis means is provided for long-term stability evaluation of geotechnical engineering.

The present application relates to the technical field of concrete monitoring, in particular to a method for monitoring and predicting carbonation depth of concrete under dry-wet cycle conditions in salt-fresh water areas. The method comprises the following steps: by laying multiple source carbonation monitoring nodes, collecting carbonation related characteristic data, and using the maximum information coefficient algorithm to screen the dominant factor; using fuzzy C-means dynamic clustering algorithm to identify carbonation stage and spatial partition; constructing partition discriminant model through multiple discriminant analysis, and combining extreme learning machine to realize carbonation depth prediction and risk assessment, and finally generating carbonation risk early warning report. The present application realizes the whole process integration of multi-source data driving, feature screening, dynamic partition clustering, partition discrimination and intelligent prediction; improves the monitoring accuracy, risk identification rate and management response efficiency of concrete members, and can provide scientific and effective technical support for concrete durability evaluation and operation management in special environments such as ocean and estuary.

The invention discloses a test device and method for simulating a dry-wet cycle of an engineering roadbed, and belongs to the technical field of model tests and tests. The test device comprises a box body, a simulation mechanism and a detection mechanism, and simulates that an engineering roadbed is in a construction stage (without an asphalt layer) or a use stage (with an asphalt layer) by controlling the disassembly and assembly condition of an asphalt plate in the box body; on the basis, a water quantity controller, a water pressure controller, a duration controller, a first temperature controller, a second temperature controller and the like are controlled to realize flexible control on a dry-wet cycle process, so that a dry and wet alternate environment in a roadbed construction stage and a use stage under actual engineering conditions can be simulated more truly; and the authenticity of environmental factor simulation and the accuracy of test data are improved. And the equipped detection mechanism is used for monitoring and adjusting the water levels on the upper and lower sides of the asphalt plate so as to detect water seepage data of roadbed engineering in different simulated natural environments, and the problem that an existing device is difficult to intuitively obtain complete data from highway construction to a use stage is solved.