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192 results about "Wet dry cycle" patented technology

The wet cycle mimics a rainfall in nature. 2. Wet Cycle. This is when the NIMBUS will provide your plants roots with water. 3.Evaporation / Aeration. As the roots absorb the water, it begins the dry cycle. 4. Dry Cycle.

Temperature control-based dry-wet circulating unsaturated soil triaxial instrument

The invention discloses a temperature control-based dry-wet circulating unsaturated soil triaxial instrument and belongs to the technical field of geotechnical engineering test instruments. The triaxial instrument comprises a triaxial instrument main body, a temperature regulating system, a pressure regulating system, a humidity regulating system and a data analyzing system. The temperature regulating system and the humidity regulating system control the temperature and humidity in a test environment. The pressure regulating system controls the axial pressure and the confining pressure and cooperates with a gas-supplying assembly to ensure the stability of the pressure chamber confining pressure. The triaxial instrument realizes control of the environment temperature. Through control of the environment humidity of the triaxial compression test, the triaxial instrument can realize a triaxial shearing test of unsaturated soil dry-wet circulating. The test environment temperature and humidity are controlled simultaneously and the mechanical evolution characteristics of unsaturated soil under coupling action of the temperature and humidity are researched. Through a senor and a data acquisition device, the test data can be measured and acquired and then be subjected to intelligent processing so that the automation of measurement and acquisition is realized.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL +1

Atmospheric corrosion test procedure and its apparatus

Provided are an atmospheric corrosion test procedure and an apparatus used for the test. The procedure involves a salt spray step for supplying salt content containing chloride ions on the surfaces of test pieces placed in a thermo-humidistat chamber and a subsequent dry-wet cyclic step including a dry sub-step for drying the surface of the test pieces in the thermo-humidistat chamber at a low relative humidity and a subsequent wet sub-step at a higher relative humidity than that in the dry sub-step, which are cycled. The salt content is supplied by spraying the salt water in the salt spray step. An exhaust step for removing the salt mist sprayed inside thermo-humidistat chamber is further inserted between the salt deposition step and the dry sub-step. The quantity of the salt content deposited on the surfaces of the test pieces is controlled by adjusting the quantity of the sprayed salt water.
Owner:HITACHI LTD

Rock-soil body shearing creepmeter considering dry-wet cycle and test method thereof

The invention relates to a rock-soil body shear creepmeter considering a dry-wet cycle and a test method thereof. The invention aims to provide the rock-soil body shearing creepmeter considering the dry-wet cycle with a simple structure and convenience in operation, and the test method thereof. Not only can a shearing creep test of a soft rock or hard soil during a dry-wet cycle process be carriedout, but also a direct shearing test of the soft rock or the hard soil under a dry-wet cycle action can be also carried out. The rock-soil body shearing creepmeter considering the dry-wet cycle is characterized by being provided with a bottom plate, wherein a driven shearing box with an upward opening is arranged on the bottom plate; a rock-soil sample is placed in the driven shearing box; a drive shearing box with a downward opening is arranged above the driven shearing box, and is arranged on the rock-soil sample in a covering way. The rock-soil body shearing creepmeter considering the dry-wet cycle and the test method thereof provided by the invention are applicable to testing mechanical parameters of the soft rock or the hard soil in a dry-wet cycle environment.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Low-temperature dry and wet circulating erosion device

The invention relates to a low temperature dry-wet circulation erosion device, consisting of timing alarm clocks, sound control delay switches, sound insulation seal boxes, a refrigerator, baskets, erosion solution tanks, an electronic valve and a water pump. The top of the refrigerator is equipped with two sound insulation seal boxes. Every sound insulation seal box is equipped with a timing alarm clock and a sound control delay switch inside. An upper erosion solution tank and a lower erosion solution tank are arranged in the refrigerator. Baskets are arranged in the upper erosion solution tank and the lower erosion solution tank. The electronic valve is arranged on the bottom of the upper erosion solution tank. A water inlet of the water pump is arranged on one side of the lower erosion solution tank. A water outlet of the water pump is arranged above one side of the upper erosion solution tank. The powers of the electronic valve and the water pump are respectively connected with two sound control delay switches. The invention makes a sample repeatedly being on the circulation between the dry erosion solution and immersion erosion solution. The device can simulate the erosion effect of the dry-wet circulation on cement based products under the low temperature environment.
Owner:TONGJI UNIV

Compression-shear testing apparatus for rock in dry-wet cyclic process

The invention belongs to the field of geotechnical engineering, and in particular relates to a compression-shear testing apparatus for a rock in a dry-wet cyclic process. The apparatus comprises an angle-variable compression-shear unit, and a compression machine for vertically applying load onto the angle-variable compression-shear unit; the apparatus also comprises a reservoir, water injection equipment for carrying out moisture saturation treatment on a rock sample in the angle-variable compression-shear unit, and heating equipment for carrying out hot-gas drying treatment on the rock sample in the angle-variable compression-shear unit. The angle-variable compression-shear unit is located in the reservoir, and the reservoir is communicated with the water injection equipment and the heating equipment. By adopting the compression-shear testing apparatus, the integration of rock sample dry-wet cyclic treatment and a shear test is realized, and the apparatus has the advantages of simple structure, convenient operation, low cost, wide application range and long service life; the rock samples in different states after different dry-wet cyclic times can be accurately simulated, shear test research is carried out on the rock samples, and moreover, failure load and displacement of the rock samples in the vertical direction in the shear test process can be recorded in real time.
Owner:ANHUI INST OF BUILDING RES & DESIGN

Equipment for simulating dry-wet circulation and fresh water to sea water circulation

InactiveCN101042329AImprove the efficiency of erosive studiesWeather/light/corrosion resistanceMaterial testing goodsElectric machineryFresh water
This invention relates to one dry and wet and fresh water and sea water recycle analogue device , which comprises shower spray head, water tank, tank rack, drive system, rotation rack and erosion liquid tank, wherein, the drive system gear is fixed onto motor axis connected to controller; the rotation rack is composed of round ring, round rack and specimen rack and the round ring is fixed on other side of round rack to make it vertical to earth level; the drive gear shape and round ring shape are meshed with one side set with erosion liquid tank and down part in the tank; specimen rack end is vertical to round ring outer one; the spray head is one round ring fixed down spray water tank rack.
Owner:TONGJI UNIV

Method for conducting dry-wet cycle and direct shear test on simulated load-bearing soil

InactiveCN105865938APrecisely control the change of moisture content in the testThe material is simple and cheapMaterial strength using steady shearing forcesSoil scienceStructural engineering
The present invention discloses a method for conducting the dry-wet cycle and the direct shear test on the simulated load-bearing soil. A device composed of a dry-wet cycle device and a shear box is arranged. The dry-wet cycle device comprises a nut, a fixed ring, upright rods, a lower bottom plate, a lower bottom plate drain hole, a cutting ring, a cutting ring buckle, a cross rib, an upper cover plate, an upper cover plate drain hole, an upper shear box, a lower shear box and a shear box base. The upright rods are provided with threads along the whole length thereof and are fixedly connected with the lower bottom plate. The upper end of the cross rib on the upper cover plate is larger than the outer diameter of the fixed ring by 1 cm. The diameter of the upper cover plate is slightly smaller than the inner diameter of the cutting ring. The straight-line distance between diagonally arranged upright rods is slightly greater than the diameter of the experiment cutting ring. The shear box is composed of the base, the lower shear box and the upper shear box. The cycle device can be installed directly into the shear box. Through adjusting a direct shear apparatus and a dial indicator, the direct shear test can be conducted. Based on the method, the unloading condition is avoided during the entire process, from the sample preparation, the dry-wet cycle to the shear failure. Meanwhile, the water content change of the test can be accurately controlled.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY

Dry-wet circulating direct shear device for structural surface of rock mass

The invention provides a dry-wet circulating direct shear device for a structural surface of a rock mass. The dry-wet circulating direct shear device at least comprises a frame, a shearing box unit and a loading unit, wherein the shearing box unit comprises an upper shearing box, a lower shearing box, a water-full component and a drying component; the upper shearing box is located above the lower shearing box; sample slots are formed in the upper shearing box and the lower shearing box; the water-full component comprises a water tank, a water inlet pipe, a water outlet pipe, a connecting pipe and a tee joint pipe; the connecting pipe is provided with a pipeline switch A; the tee joint pipe is provided with a pipeline switch B; the water tank is located in the lower shearing box and is communicated with the sample slots; the water inlet pipe, the water outlet pipe and the connecting pipe are communicated with three openings of the tee joint pipe, respectively; the other end of the connecting pipe is communicated with the water tank; the drying component comprises a draught fan and a ventilating pipeline; the draught fan is located outside the lower shearing box and is communicated with the sample slots through the ventilating pipeline. The dry-wet circulating direct shear device for the structural surface of the rock mass can realize control on dry and water-full environments in the shearing process of the structural surface, can meet the requirement of test on dry-wet circulating condition to the greatest extent and can realize true dry-wet circulating shearing.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Unsaturated soil slope apparatus for measuring deformation and suction of soil, and operating method thereof

The invention relates to the technical filed of geotechnical direct shearing apparatuses, and discloses an unsaturated soil slope apparatus for measuring the deformation and suction of soil. The apparatus comprises a slope model case, a data acquisition structure and an environment simulation structure; the upper end of the slope model case is oblique, one sidewall of the slope model case is transparent, and the transparent sidewall is provided with a plurality of index points; the environment simulation structure comprises a water spray structure and a drying structure; and the data acquisition structure comprises a camera and a suction sensor, the camera is arranged outside the transparent sidewall, and the suction sensor is inserted into the slope model case. In a cavity for accommodating unsaturated soil, wet-dry cycle simulation of the water spray structure and the drying structure is carried out, the camera acquires the deformation of unsaturated soil to measure macroscopic mechanical properties, the suction sensor acquires the suction data of the unsaturated soil to measure microscopic mechanical properties, and the apparatus is of great significance for the advanced researches of the mechanic characteristics of water and soil of the unsaturated soil slope under natural conditions and the stability under rain dry-wet cycle.
Owner:SHENZHEN GONGKAN GEOTECHN GRP

Concrete seawater environment dry-wet cycle test device

The invention discloses a concrete seawater environment dry-wet cycle test device. The concrete seawater environment dry-wet cycle test device comprises a dry-wet cycle test box system, a liquid storage system, a master control box and an air compression system. The dry-wet cycle test box system is connected with the liquid storage system through a solution circulation system and connected with the air compression system through a blow pipeline. The master control box controls the dry-wet cycle test box system, the liquid storage system, the air compression system and the solution circulation system. The device is high in automation degree, easy and convenient to operate and convenient to control, solves the problem that solute deposits in existing equipment, and can be widely applied to the concrete dry-wet cycle test in a simulated seawater environment.
Owner:SOUTHEAST UNIV +2

Rock expansion pressure test instrument considering dry-wet circulation effect

The invention relates to a rock expansion pressure test instrument considering dry-wet circulation effect. The test instrument comprises a sealed container and a door-shaped frame fixing the sealed container. The upper end of the sealed container is provided with a seal cover, the sealed container is internally provided with a pressure air sac, the pressure air sac is communicated with a gas bomb outside the sealed container, a feedwater unit is communicated with the sealed container through a water supply pipe, and a drying device is communicated with the sealed container through a gas supply pipe. An axial pressurization device is disposed on the cross beam of the door-shaped frame, the loading pressure head of the axial pressurization device is connected to a load sensor through a conversion adapter to preload the seal cover. A displacement sensor is fixed on the cross beam of the door-shaped frame through a magnetometer seat, the displacement sensor ejector rob is in contact with the seal cover, and a rock sample is placed in a test-piece box within the sealed container. The rock expansion pressure test instrument provided by the invention has the advantages of simulating the actual occurrence environment of reservoir bank slope hydro-fluctuation belts, considering the reservoir water pressure fluctuation change, dry-wet circulation and temperature coupling effects, and accurately testing the expansion pressure of soft rock.
Owner:CHINA THREE GORGES UNIV

Soil sample dry and wet circulating test instrument

The invention provides a soil sample dry and wet circulating test instrument. The test instrument at least comprises a bracket, and a lifting mechanism, a saturated component and a constant-temperature evaporating component, which are fixed to the bracket, wherein the constant-temperature evaporating component is positioned above the saturated component; a soil sample turning mechanism is arranged in the saturated component; the lifting mechanism is used for driving a pedestal to move up and down along the vertical direction; the soil sample turning mechanism comprises the pedestal, two slide rails and more than two supporting plates; the slide rails are fixed to the pedestal; the supporting plates are arranged on the two slide rails; the pedestal is a rectangular square frame; the shape of the two slide rails is the same; each of the two slide rails is shaped like a wavy line; the two ends of the slide rails are respectively arranged on two short sides of the pedestal; a slide block is arranged at each of the two ends of each supporting plate; the supporting plates are arranged on the slide rails through the slide blocks and can slide along the slide rails. According to the soil sample dry and wet circulating test instrument provided by the invention, a soil sample can be turned by the soil sample turning mechanism, so that the soil sample is guaranteed to be more uniform and full in dryness and saturation; the test instrument can treat a plurality of soil samples at one time, the consumed time is little, and the efficiency is high.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Asbestos-free straw fiber reinforced cement board and preparation method thereof

InactiveCN111217560ALittle loss of strengthGood moisture and heat stabilityCeramic shaping apparatusTriethoxysilaneCement board
The invention relates to an asbestos-free straw fiber reinforced cement board and a preparation method thereof. The straw fiber reinforced cement board is mainly prepared from, by weight, 6-8 parts ofmodified wheat straw fibers, 5-6 parts of silica fume, 48-52 parts of cement, 10-12 parts of metakaolin, 20-22 parts of quartz sands and 5-6 parts of fly ash. A preparation technology of the modifiedwheat straw fibers comprises the following steps: 1) cutting dry wheat straws into a short material, and soaking and softening with water to obtain a prepared material; 2) performing steam explosionon the prepared material to obtain an exploded material; 3) sequentially carrying out alkaline leaching and water washing on the exploded material to obtain a fiber material; and 4) modifying the fiber material with gamma-aminopropyltriethoxysilane to obtain the asbestos-free straw fiber reinforced cement board. The asbestos-free straw fiber reinforced cement board is good in appearance quality, low in water absorption and wet expansion rate, good in water resistance and moisture resistance, high in mechanical properties, resistant to freeze thawing and hot water, good in dry-wet cycle performance, stable in properties, green and environmentally friendly, and can replace a wood pulp fiber reinforced cement board.
Owner:郑州知淘信息科技有限责任公司

Device and method for testing mechanical property of soil which is improved through electrochemistry under action of dry-wet cycle

The invention discloses a device and a method for testing the mechanical property of the soil which is improved through electrochemistry under the action of dry-wet cycle, which are applied to electrolytically treating viscous soil and testing the mechanical property thereof. The soil is electrolyzed by arranging electrodes at the upper end and the lower end of the shearing box, and the cation replacement inside the soil is achieved, therefore, the water absorption property of the soil is improved, the specific gravity of the combined water and the free water is changed, and the basis is provided for researching the change rule of the water absorption property of the soil on the mechanical property of the soil under the dry-wet cycle. By designing the steam humidification tube inside the shearing box to carry out humidity control, the soil sample is simulated under the dry-wet cycle, and the moisture content probe is arranged in the soil, so that the moisture content change of the soilin the dry-wet cycle can be tested. Through the design of the annular shearing box, the cyclic shearing can be achieved, and the problem of soil missing in the cyclic shearing is avoided, therefore,the test on the shear strength and the mechanical property, and the change rule of the soil under the condition of dry-wet cycle is achieved. The device is ingenious in structural design, convenient to implement, and high in practical value and popularization value.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY

Mass-type rock soil wetting-drying cyclic experiment apparatus and experiment method

The invention provides a mass-type rock soil wetting-drying cyclic experiment apparatus and experiment method. The experiment apparatus comprises a shell, a control unit, a wetting-drying conversion device and a weighing unit, wherein the control unit, wetting-drying conversion device and weighing unit are arranged in the shell; the wetting-drying conversion device is provided with a humidifier and a drying unit; the humidifier, drying unit and weighing unit are respectively connected with the control unit through an analog-to-digital converter; the control unit is connected with a digital-to-analog converter; the digital-to-analog converter is connected with the humidifier, drying unit and weighing unit; the weighing unit is arranged below the wetting-drying conversion device; and the control unit is used for receiving a mass signal of the weighing unit, performing wetting-drying judgment, and sending a control signal to the wetting-drying conversion device. The experiment apparatus and experiment method provided by the invention are specially used for wetting-drying cyclic experiments in geotechnical engineering to enhance the automation degree and precision of the experiment.
Owner:甘肃省交通科学研究院集团有限公司

Wetting-drying cycle tester for water rock

InactiveCN103063818AFully automatedAvoid cumbersome manual operationsEarth material testingAutomatic controlLiquid storage tank
The invention provides a wetting-drying cycle tester for a water rock. The wetting-drying cycle tester comprises a test chamber and a support. The support is installed at the bottom of the test chamber. Two opposite vacuum test chambers and two opposite drying chambers are fixed in the top of the test chamber. The two opposite vacuum test chambers are connected with a vacuum pump and a bi-directional water pump; the bi-directional water pump is connected with a liquid storage tank installed in the test chamber through a water control valve; the lower end of the test chamber is provided four test chamber chassis; and the bottom surface of the chassis of the test chamber is equipped with a rotatable automatic lifting rotary shaft. The tester realizes automatic control by a control unit composed of a temperature sensor, a pressure sensor, a motor, a PLC controller and a relay. The tester realizes the automation of the testing process, prevents tedious manual operations, shortens test time, accelerates testing process and reduces the error caused by manual operations.
Owner:CHANGAN UNIV

Device and method for dry-wet cycle simulation test of concrete in tidal zone and splash zone

The disclosure relates to a device and method for a dry-wet cycle simulation test of concrete in a tidal zone and a splash zone. A main structure includes a liquid storage tank, a test chamber, a communicating pipe, air holes of the liquid storage tank, air holes of the test chamber, ceiling fans, steel pipes, a support frame, an upper water level sensor, a lower water level sensor, a temperature and humidity sensor, a temperature sensor, a chamber body support, a communication valve, a pipe support, a water inlet pump, a water inlet valve, a water outlet pipe, a water outlet pump, a water outlet valve, spray water pipes, spray heads, and a control box. The control box can control and record test parameters in real time, so that the boundary between the tidal zone and the splash zone is clear.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY

Soft rock shear rheological test system with simulation of coupled rainfall seepage and blasting vibrations

The disclosure relates to a soft rock shear rheological test system with simulation of coupled rainfall seepage and blasting vibrations, which is at least provided with a loading device and a shear box. The loading device includes a frame (2), a normal static load electric cylinder (1) disposed on a top of the frame (2) and a normal dynamic load electric cylinder (16) disposed on a lower portion of the frame (2), a horizontal static load electric cylinder (5) and a horizontal dynamic load electric cylinder (12) disposed on both sides of the frame (2), and a reaction post (10). This test system can perform a dry-wet cycle operation on the test specimen without disassembling the shear box during the shear rheological test, and can truly simulate influences of rainfall seepage and blasting vibrations on the shear rheological effect of soft rock.
Owner:WUHAN UNIV OF SCI & TECH

Similar material for simulating expansible tunnel surrounding rock and preparation method of similar material

The invention relates to a similar material for simulating an expansible tunnel surrounding rock and a preparation method of the similar material. The similar material comprises the following components with different permeation grades: high-permeability expansive soil, medium-permeability expansive soil and low-permeability expansive soil, wherein the high-permeability expansive soil comprises 96-105 parts of coal ash, 11-17 parts of bentonite and 8-10 parts of silicon oil; the medium-permeability expansive soil comprises 95-104 parts of coal ash, 17-25 parts of bentonite and 8-11 parts of silicon oil; and the low-permeability expansive soil comprises 96-105 parts of coal ash, 25-30 parts of bentonite and 9-12 parts of silicon oil. According to the preparation method, bentonite with different permeation rates can be proportioned to carry out a model experiment, not only can the drying and wetting cycle field condition be simulated, but also the mechanical and deformation characteristics of the expansible surrounding rock can be met; and the local materials are used, so that the materials are conveniently obtained and are saved. The bentonite is a rock mainly composed of montmorillonite so as to have extremely high expansibility. Non-combusted carbon granules in the coal ash are of loosen porous structures so as to have high permeability and an expansion inhibiting effect, and furthermore, the permeability and expansion grade of the similar material can be regulated by changing the ratio.
Owner:SHANDONG UNIV

Matrix suction force control method for substrate dry-wet cycle test

The invention relates to the technical field of civil engineering, in particular to a matrix suction force control method for substrate dry-wet cycling test. The invention provides a substrate dry-wet cycle test device which comprises a hollow pressure chamber composed of a pressure chamber base and a lower opening type pressure chamber cover; a hollow sample device is arranged in the hollow pressure chamber and is positioned on the pressure chamber base, a sample device base is arranged at the bottom of the sample device, a rubber film is arranged on the side wall of the sample device, a sample upper cap is arranged at the top of the sample device, a high-air intake value pottery clay plate is arranged on the upper surface of the sample device base, and permeable stone is arranged on the lower surface of the sample upper cap. The substrate dry-wet cycle test device further comprises a back pressure sensor, a pore water pressure sensor, an air pressure sensor and a confining pressure sensor. The matrix suction force control method has the benefits that an instrument used in the test method provided by the invention is simple to manufacture, the test result accuracy is high, the use is convenient, the sample dry-wet cycling test control requirements are met, and the dry-wet cycle test of various porous media including sand, sandy soil, silt and clay can be directly carried out.
Owner:TONGJI UNIV

Rock soil wetting-drying cycle test device and use method thereof

ActiveCN105891445AAccurate monitoring of mass changesMonitor changes in moisture contentWeighing by removing componentEarth material testingSoil scienceLap joint
The invention discloses a rock soil wetting-drying cycle test device and a use method thereof. The device is characterized by comprising a loading device (1) arranged on a weighing device (2) and a heating device (3) used for heating a sample device in the loading device (1), the loading device (1) comprises a base (4) horizontally arranged on the weighing device (2), the base (4) is sequentially and vertically provided with a fixed baffle (5) and a movable baffle (6) from left to right, the bottom end of the fixed baffle (5) is fixedly arranged on the base (4), the bottom end of the movable baffle (6) is in lap joint with the base (4), and the base (4) is provided with a weir (12) used for limiting the position of the movable baffle (6). By means of the rock soil wetting-drying cycle test device and the use method of the device, loads can be applied to soil, and the water content and deformation of soil body can be precisely monitored in real time.
Owner:HOHAI UNIV

Automatic control method and device for rock-soil drying and wetting cyclic test

The invention discloses an autonomous control method and device for rock-soil drying and wetting cyclic test. The method comprises the following steps that A) a test sample is placed in a pallet, and a power supply or switch is switched on; B) wetting and drying standing time and the cycle frequency are input to a meter panel of a time controller, the working temperature is set in a meter panel of a temperature controller, and the drying state water content, the wetting state water content and total weight of the sample are input to the meter panel of a water content controller; C) the water content controller monitors the water content of the sample in a baking over in real time; D) the temperature controller monitors and adjust the temperature in a work room dynamically; and E) a time controller controls the test process in a unified way, and the control device is not stopped automatically until the whole rock-soil drying and wetting cyclic test is completed. Time, temperature and water content control systems are integrated, rock-soil drying and wetting cyclic test is controlled automatically, operation is simple, test is more accurate, and a parallel test problem in the rock-soil drying and wetting cyclic test can be solved.
Owner:CCCC SECOND HIGHWAY CONSULTANTS CO LTD

Soil mass dry-wet circulating annular shearing instrument capable of measuring humidity

The invention provides a soil mass dry-wet circulating annular shearing instrument capable of measuring humidity. The soil mass dry-wet circulating annular shearing instrument comprises a workbench, a main shearing box, a vertical loading device, a rotating power driving device and a dry wet circulating device, wherein the main shearing box is arranged on the workbench and a dial indicator is arranged at the top end of the vertical loading device. The dry-wet circulating device provided by the invention solves the problem that the conventional annular shearing test instrument is difficult to research the deforming property of the annular sample in a dry-wet circulating process; the hygrometer is used for measuring the humidity in the wet circulating process; the top tray is detachable; the space for the sampling process of the annular sample is ensured; the damage to the annular sample in the sampling process is effectively reduced; a first force transfer shaft passes through a through hole a in a cross bar of the top tray and moves up and down along the vertical direction, so that the pressurizing cross bar can move up and down and the deforming displacement space for vertically loading the annular sample in the test process is ensured.
Owner:XIAN CHANGQING TECH ENG

Wetting-drying cycle testing device for soil three-directional soaking under action of load

PendingCN109100225AMoist and dry evenlyDoes not cause uneven heatingWeighing by removing componentEarth material testingHorizonEngineering
The invention discloses a wetting-drying cycle testing device for soil three-directional soaking under the action of a load. The wetting-drying cycle testing device comprises a humidifying mechanism,a drying mechanism, a weighing mechanism, a pressurizing mechanism, a measuring mechanism and a testing cylinder mechanism; the pressurizing mechanism is placed on a bearing plate of the weighing mechanism; a soaking box of the humidifying mechanism is placed on a base of the pressurizing mechanism; the testing cylinder mechanism is placed in the soaking box; a pressurizing rod in the pressurizingmechanism is positioned on a male plate at the top of the testing cylinder mechanism; the measuring mechanism is fixed on a female plate at the testing cylinder mechanism and a pressurizing lever ofthe pressurizing mechanism respectively by a dial gauge strut and a clamping device; and the drying mechanism is arranged above the pressurizing mechanism. The device implements a combined effect of soil soaking and the load in the soil three-directional soaking and soil wetting-drying cycle processes; an overlying load can be determined according to burden pressures applied to different filled horizons of a roadbed, and a pavement structural layer and a weight of a vehicle load can be considered; in the wetting-drying cycle process, moisture content of soil can be monitored in real time without disassembling the overlying load; and the working condition consistent with the field is implemented.
Owner:GUIZHOU UNIV

Test device for fracture evolution law of pre-disintegrated carbonaceous mudstone under dry-wet cycle condition

PendingCN109030769AFully saturatedRealize wet and dry cycleEarth material testingWet dry cycleEngineering
The invention discloses a test device for a fracture evolution law of a pre-disintegrated carbonaceous mudstone under a dry-wet cycle condition. The device comprises a drying system and a humidification system. The humidification system is composed of a triaxial apparatus saturator, a vacuum saturation cylinder, a water bucket and a top plate, wherein a bottom plate is provided with the vacuum saturation cylinder and the triaxial apparatus saturator is placed on the middle thereof, and the water bucket and an oil pump are arranged at both sides of the vacuum saturation cylinder respectively. The drying system is composed of an electronic scale, bulbs, a fan, a vent hole, a top plate and a separator. The electronic scale is arranged on a bottom plate, a soil sample is placed on the electronic scale, the electric fan is arranged on a box wall of the system, a digital camera is arranged at the middle of the top plate, and the top plate is symmetrically provided with two bulbs and a vent pipe. The test device for the fracture evolution law of the pre-disintegrated carbonaceous mudstone under the dry-wet cycle condition has the advantages that the degree of automation is high, drying and humidifying are relatively uniform, the operation of instruments is simple and the efficiency is high.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Dry-wet cycling ultraviolet irradiation automatic corrosion test chamber and test method

ActiveCN104764688AAccurately grasp the associationRealize automatic alternate testWeather/light/corrosion resistanceControl systemTest chamber
The invention discloses a dry-wet cycling ultraviolet irradiation automatic corrosion test chamber and test method for simulating degradation of organic material in a tide zone in a marine environment. A parallel ultraviolet source system, an adjustable type sample hanging frame and a temperature detection system are arranged in a chamber body, an electric lifting device is arranged just at the center of the top surface outside the chamber body, the adjustable type sample hanging frame is connected just to the downside of the electric lifting device in a rigid manner, and a corrosion sample is mounted on the adjustable type sample hanging frame; a ventilation cooling system and a master control system are also arranged on the top surface of the chamber body; the adjustable type sample hanging frame is composed of adjustable bolts and two identical sample racks; each sample rack comprises an adjustable sample hanging frame support rod, a sample pedestal and a transverse support rod, and the corrosion sample is mounted on the sample pedestal; the dry-wet cycling period, an ultraviolet source, a temperature probe and the ventilation cooling system are controlled by the master control system through coordinated control, and the electric lifting device automatically ascends and descends at fixed time, thus, the degree of automation is high, and the reliability of test results is improved.
Owner:HUAWEI TEHCHNOLOGIES CO LTD

Device and method for simulating influences of drying and watering cycle action generated by water level variation of fluctuating belt of reservoir on reservoir bank slope rock masses

The invention discloses a device and a method for simulating influences of drying and watering cycle action generated by water level variation of a fluctuating belt of a reservoir on reservoir bank slope rock masses. The device comprises a test chamber and a sample bracket arranged in the test chamber; one end of a screw rod is mechanically connected with a motor outside the test chamber, and the other end of the screw rod extends into the test chamber; the screw rod is provided with impellers; the upper end of the test chamber is provided with an admission pipe, an air release valve and a rock adding hole; the rock adding hole is provided with a top cover; a water outlet is formed in the lower end of the test chamber; a flow heater is arranged in the test chamber; a ventilation hole is formed in the side face of the test chamber; the ventilation hole is communicated with an air blower. The method comprises the step of repeatedly conducting a rock sample wet environment test and a rock sample dry environment test so as to simulate a test environment in the test chamber more truly. The device and the method disclosed by the invention that more accurate tests are realized by simulating different flow rates, water pressure states and different periods of drying and watering cycle, so that the controllability of test variables is higher, and follow-up related test study can be conveniently performed.
Owner:CHINA THREE GORGES UNIV

Formula of anti-corrosion concrete used for filling pile and preparation method of anti-corrosion concrete

InactiveCN104150837AChanging practice in estimating fly ash useReasonable mix designSolid waste managementStructural engineeringChloride ion penetration
The invention discloses a formula of anti-corrosion concrete used for a filling pile and a preparation method of the anti-corrosion concrete. Ordinary Portland cement and two-stage coal ash are adopted as cementing agents for concrete, and an appropriate amount of high molecular material polyacrylate and sodium nitrite are added to be used as modified materials for concrete, so that the concrete, with the function of preventing the erosion of sulfate and chloride ions, for the filling pile is prepared. The doping amount of the coal ash is given by adopting a computation method, so that the design of mix proportion is more reasonable; the concrete has better workability, and the working performance of the concrete for the filling pile is guaranteed; a chloride ion penetration experiment proves that the electric flux is quite low, and accordingly, the concrete has higher compactness; especially, after the concrete is put into a sodium sulfate solution of 10% and subjected to dry-wet cycling for 150 times, the compressive strength ratio is still 0.92, and the surface of a concrete briquette is complete without loss basically; the materials are easy to obtain, the preparation method is simple, the cost is low, and positive significance on the environmental protection is achieved.
Owner:HEBEI CONSTR & INVESTIGATION RES INST

Device and method for measuring water and soil characteristic curve under dry and wet circulation

The invention relates to a device and a method for measuring a water and soil characteristic curve under dry and wet circulation. The device comprises an experiment part, wherein the experiment part is arranged in Micro-CT detection equipment; the experiment part comprises a soil sample chamber, a suction force applying part and a connecting pipeline; a first base is arranged at the bottom part ofthe soil sample chamber; the suction force applying part comprises a water storage chamber, an organic glass tube and a second base; the organic glass tube is connected below the water storage chamber through a valve; the second base is arranged under the organic glass tube, and is connected with the first base through the connecting pipeline; the suction force applying part is fixedly connectedwith a fixture on an iron stand through the iron stand; a laser displacement meter is arranged on the iron stand, and is used for measuring the change of water level in the organic glass tube.
Owner:SOUTHWEST JIAOTONG UNIV

Implementation method of conducting dry-wet cycle by simulating soil body bearing load in engineering

The invention discloses an implementation method of conducting a dry-wet cycle by simulating a soil body bearing load in engineering. A device is arranged for conducting the dry-wet cycle by simulating the soil body bearing load in engineering, wherein the device comprises nuts, a fixing ring, vertical rods, a lower bottom plate, lower bottom plate drainage holes, a cutting ring, a criss cross arris, an upper cover plate and upper cover plate drainage holes, a thread adheres to each vertical rod in the whole length, and the vertical rods are fixedly connected with the lower bottom plate; the upper end of the criss cross arris on the upper cover plate is one centimeter larger than the outer diameter of the fixing ring; the inner diameter of the fixing ring is slightly larger than the outer diameter of the cutting ring, so that the cutting ring is convenient to place therein, four vertical grooves are formed in diagonal positions of the ring wall of the fixing ring, an inner thread of each vertical groove is occluded with the thread of the corresponding vertical rod, and an inner thread of each nut is occluded with the thread of the corresponding vertical rod. By means of the device, the purpose of conducting soil body dry-wet cycle tests under the condition that the moisture content is controlled accurately is achieved. The device is simple and cheap in material, easy and convenient to operate and easy to grasp, the stress condition simulation is close to the engineering practice, and engineering application is facilitated.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY
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