CN114965972A - Road material dry-wet and freeze-thaw cycle test device and method suitable for supergravity centrifugal condition - Google Patents
Road material dry-wet and freeze-thaw cycle test device and method suitable for supergravity centrifugal condition Download PDFInfo
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- CN114965972A CN114965972A CN202210539509.8A CN202210539509A CN114965972A CN 114965972 A CN114965972 A CN 114965972A CN 202210539509 A CN202210539509 A CN 202210539509A CN 114965972 A CN114965972 A CN 114965972A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention discloses a road material dry-wet and freeze-thaw cycle test device and method suitable for a supergravity centrifugal condition. And a flowmeter is arranged at the water inlet switch valve group and used for recording the flow. And a displacement sensor is arranged in the middle of the cover plate and records the deformation of the sample in the sleeve in the whole process of dry-wet or freeze-thaw cycle. The temperature control module wraps around the test sleeve, the outer side of the temperature control module is provided with a heat insulation layer, and an interlayer is arranged between the temperature control module and the test sleeve, so that uniform temperature control is provided for the interior of the test sleeve through inflow liquid. The device can realize continuous dry-wet or freeze-thaw cycle tests on the road material, does not need to stop the operation of a machine, realizes continuous high-low temperature control and freeze-thaw cycle control, records the deformation of a test sample in the test process, and effectively simulates and records the change characteristics of the road material in the actual service process.
Description
Technical Field
The invention relates to the field of road engineering materials, in particular to a road material dry-wet and freeze-thaw cycle test device and method suitable for a supergravity centrifugal condition.
Background
At present, the highway construction in China has gained worldwide attention, the highway traffic mileage reaches over five hundred and ten thousand kilometers, and the highway occupies the first place of the world. The road needs to be maintained, which consumes a great deal of manpower and material resources. The road can bear the natural environment effect such as illumination, water and heat at long-term in-service for the road structure disease appears, reduces performance, influences driving comfort or even driving safety. The most typical of them is water damage, which is caused by the fact that rainfall on the ground surface invades from top to bottom or the underground water level rises to invade the roadbed, the humidity state in the road structure is changed, the roadbed is softened, and the materials are damaged. The most harmful in water damage is the damage to the roadbed, which can cause large-area cracking, even collapse, of the road surface from bottom to top, and the driving safety is damaged.
The earth surface and the underground water enter the interior of the road structure and generally show periodic dry-wet circulation; and in perennial frozen soil or seasonal frozen soil regions, periodic freeze-thaw cycles are represented. The two effects can generate destructive effect on the roadbed structure, so that roadbed material tests under corresponding environmental conditions need to be carried out, and the influence and the destructive mechanism of dry-wet circulation and freeze-thaw circulation on soil are researched. Conventional dry-wet cycling and freeze-thaw cycling tests require long-term wet-heat conditioning of the test material in a specific environment (e.g., water saturation, temperature control) to ensure that the material is sufficiently saturated/frozen or drained/thawed, with a conditioning cycle taking up to about 7 days. The simulated state of the conventional test is not in accordance with the actual service state, the material is not in a complete saturation state but in a mixed state of partial material saturation and partial material non-saturation when the pavement structure is in a frozen or soaked state, and the final state in the drying or melting process is stable in a balanced humidity state and is not in a complete drying state adopted at present, so the state of the material in the structure cannot be effectively reflected by the conventional test. The occurrence of the hypergravity centrifugation method can enable the scale model to reflect the stress state and the denaturation characteristic of the prototype structure, meanwhile, the hypergravity can accelerate the seepage and heat transfer process in the material, the dry-wet and freeze-thaw cycle test time can be greatly shortened, and the efficiency is improved. Therefore, a test device suitable for the supergravity centrifugal condition and capable of reflecting the damp-heat rule of the road structure under the periodic change of the external environment under the actual service condition needs to be designed, the long-term performance change of the road material is reflected, and effective information is provided for analyzing the long-term service performance of the road subgrade.
Disclosure of Invention
The invention aims to develop a test device suitable for road material dry-wet and freeze-thaw cycle under a supergravity centrifugal condition, which realizes full-automatic dry-wet and freeze-thaw cycle control of a test material under the supergravity centrifugal condition through water inlet/drainage control, a temperature control module and a collection and filtration device, simulates periodic change of the material under an actual service condition, quickly obtains deformation and mass loss of the road material under periodic water saturation-drainage and frost heaving-thawing conditions by utilizing a supergravity environment, greatly improves test efficiency and reduces test time. And through computer control, multiple full-automatic cycle tests are realized, and the influence of manual operation is reduced. The device and the method are provided for behavior analysis and prediction of the road material under long-term circulation of environmental factors.
The technical scheme of the invention is as follows: a road material dry-wet and freeze-thaw cycle test device suitable for the condition of supergravity centrifugation comprises:
a test cartridge mounted on the centrifuge;
the temperature control module is wrapped on the test sleeve;
the top cover plate is arranged at the top of the test sleeve;
the bottom plate is arranged at the bottom of the test sleeve;
the water inlet is arranged at the top of the test sleeve and is communicated with the interior of the test sleeve;
the collecting and filtering device is arranged at the bottom of the test sleeve and is communicated with the interior of the test sleeve;
and a drain port in communication with the collection and filtration device.
In the invention, the test sleeve is a metal cylinder and can be directly installed in a model box of the centrifugal machine, the upper part of the test sleeve is a detachable cover plate which is connected with a water pipe and a displacement sensor, and the bottom of the test sleeve is a porous detachable bottom plate which is used for installing samples and draining water. The water inlet switch valve group is located on a top cover plate of the test sleeve and connected with an external water path through a guide pipe, and the water outlet switch valve group is located at the bottom. Both can be opened and closed by software control. A flowmeter is installed at the water inlet switch valve group and used for recording flow, and the flowmeter is connected to a cover plate of the test sleeve through a guide pipe. And a displacement transducer (LVDT) is arranged in the middle of the cover plate, and the deformation of the sample in the sleeve in the whole dry-wet or freeze-thaw cycle process can be recorded after waterproof treatment. The temperature control module wraps around the test sleeve, the outer side of the temperature control module is provided with the heat insulation layer, an interlayer is arranged between the heat insulation layer and the test sleeve, and the inner part of the test sleeve is uniformly controlled by flowing liquid. And the test sleeves with different diameters can be replaced according to different test requirements. The filtering and collecting device is positioned at the bottom of the test sleeve, and a permeable stone and a filter screen are placed at the water outlet for collecting soil particles lost in the circulation test process. The device is suitable for a supergravity centrifugal environment, water feeding and discharging are directly controlled through software, a continuous cycle test is realized, the machine operation can be completed without stopping, continuous high-low temperature control is realized, freeze-thaw cycle is realized, the deformation of a sample in the test process can be recorded, and the change characteristics of the material in the actual service process can be effectively simulated and recorded.
The test sleeve is a stainless steel cylinder and can be fixed on a model box of the centrifugal machine through bolts, a cover plate is arranged at the top of the test sleeve, and O-shaped sealing rings are arranged on the cover plate and the top of the test sleeve to realize sealing of the sleeve. The internal diameter of the sleeve is slightly larger than the diameter of the sample, for example, the internal diameter of the sleeve for a sample having a diameter of 100mm is 105 mm. The elastic rubber membrane is attached to the interior of the sleeve and sleeved on the sample, the purpose is that the soil sample can be subjected to radial expansion deformation in the freeze-thaw cycle process, and the rubber membrane can ensure the surrounding tightness and allow radial deformation. The bottom of the sleeve (i.e., the bottom plate) is a perforated metal plate for draining water to the bottom.
The water inlet is communicated with the interior of the test sleeve through a water inlet electromagnetic valve, and the water inlet electromagnetic valve is arranged at the top of the test sleeve. The water outlet is connected with a water discharge electromagnetic valve, and the water discharge electromagnetic valve is arranged at the bottom of the test sleeve. The water inlet/outlet opening/closing electromagnetic valve sets are respectively positioned at the top and the bottom of the test device, are connected with an external controller through a slip ring, and are used for controlling water inlet in the humidifying process and water discharge in the (melting) drying process of materials during the dry-wet and freeze-thaw cycle. Wherein the water pipe at the water inlet can be directly connected with an external faucet through a rotary joint without being connected with a water storage tank, thereby realizing multiple circulation.
The water inlet is provided with a flowmeter, the flowmeter is positioned at the water inlet and is connected with an external controller through a slip ring, and the water inflow can be measured. Different water quantities are added according to different test requirements, and when the flow reaches the target water inflow, the electromagnetic valve of the water inlet is closed.
The testing device is characterized in that a displacement sensor (LVDT) is arranged in the testing sleeve, one end of the displacement sensor (LVDT) is fixed on a top cover plate of the testing sleeve, the other end of the displacement sensor (LVDT) extends into the testing sleeve, and the displacement sensor (LVDT) is connected with an external controller through a rotary joint and used for recording axial deformation of a sample in the dry-wet and freeze-thaw cycle process.
The temperature control module is positioned around the test sleeve, has a diameter slightly larger than that of the test sleeve and wraps the test sleeve. The outside of accuse temperature module has the heat preservation, has the intermediate layer simultaneously between heat preservation and the test sleeve, the intermediate layer in let in liquid medium and carry out temperature cycle control, can reduce heat exchange simultaneously. The temperature control range can be controlled to be-10 ℃ to 60 ℃ by connecting the slip ring with an external controller. Liquid enters the interlayer from the bottom of the left side during use and flows out from the upper part of the right side, so that effective heat transfer is guaranteed to be carried out inside the whole sleeve.
The collecting and filtering device is positioned at the bottom of the test sleeve, an O-shaped sealing ring is matched with the O-shaped sealing ring, a water outlet is formed in the bottom of the device and used for draining water downwards, a prototype groove is formed above the water outlet, a permeable stone is placed in the groove and used for filtering soil particles in a water body in a dry-wet and freeze-thaw cycle process, and the particle loss amount of a soil body under corresponding dry-wet and freeze-thaw cycle conditions can be obtained by weighing after the test is finished. The water outlet is connected with the water discharge electromagnetic valve.
A road material dry-wet and freeze-thaw cycle test method comprises the following steps:
a. the sample is shaped according to the target water content and the dry mass m of the sample is recorded 0 ；
b. Sleeving a rubber film on a sample, coating silicon oil on the surface to reduce friction, and placing the sample into a sample cylinder;
c. adding water into the cylinder according to the test target water level, setting a target centrifugal acceleration Ng, opening the centrifugal machine, and rotating to uniformly distribute the water in the sample;
d. setting target freezing temperature, if performing dry-wet cycle test, not setting the temperature, and allowing the machine to continue to operate, wherein the operation time and the simulated material prototype structure freezing time are 1/N 2 If the dry-wet cycle test is carried out, the freezing time is the soaking time;
e. setting the melting temperature, opening a drainage switch to drain the sample cylinder, wherein the drainage time is 1/N of the melting and drainage time of the simulated material prototype structure 2 The relationship is such that,
f. repeating the steps c-e according to the requirement of the test on the number of dry-wet or freeze-thaw cycles;
g. recording the flow change of the flow meter in the process, collecting the amount of particles lost in the process of melting and draining through a collecting device, drying the collected particles to obtain the mass m 1 Calculating the material loss rate as
Compared with the prior art, the invention has the following advantages:
the invention is suitable for the condition of hypergravity centrifugation, and compared with the conventional test method, the N can be realized by controlling the centrifugation speed of Ng 2 Accelerated times of seepage and heat exchange, i.e. only 1/N 2 The time can reach the same freezing or humidity state under the conventional test condition, thereby greatly saving the test time.
In a conventional dry-wet cycle and freeze-thaw test, a sample is in a fully saturated soaking state, and the actual service state is a soaking state under different water level conditions and is in a mixed state of partial material saturation and partial material non-saturation. In the invention, the water inflow reaches the target immersion water level through flow control, and the final humidity state of the model in the drainage process is ensured by adjusting the rotating speed of the centrifugal machine instead of conventional drying treatment; therefore, the experimental method designed by the technology is more consistent with the actual service condition of the pavement structure.
The invention adopts a liquid medium circulating flow mode to control the temperature of the internal model, is different from a semiconductor and heating plate temperature control mode, can provide continuous, uniform and stable temperature control in a limited space, and can realize continuous temperature control through external computer control.
According to the invention, the axial deformation of the sample in the dry-wet or freeze-thaw cycle process can be recorded through the displacement sensor, so that the deformation rule of the material under the dry-wet or freeze-thaw condition can be obtained. Meanwhile, the constraint of radial deformation of the material is reduced through the flexible rubber film, so that the frost heaving deformation behavior of the soil particles is more consistent with the behavior in the actual road structure.
The invention can realize the flow recording in the seepage process through the high-precision flowmeter, thereby obtaining the change of the permeability coefficient of the material and analyzing the permeability characteristic of the material under different dry-wet cycles, freeze-thaw cycles and humidity conditions.
In addition, the device utilizes software control experimental intaking and drainage through electromagnetic switch, need not to stop centrifugal machine and operates. Namely, the model can be subjected to continuous multiple dry-wet or freeze-thaw cycles under the condition of not stopping the test, and the long-term characteristics of the model under the condition can be effectively simulated.
Drawings
FIG. 1 is a cross-sectional view of a test device of the present invention;
FIG. 2 is a top view of the test device of the present invention;
FIG. 3 is an overall view of the test apparatus of the present invention.
Reference numerals: 1-a water inlet; 2-water inlet electromagnetic valve; 3-a flow meter; 4-displacement transducer (LVDT); 5-temperature control module; 6-collecting and filtering means; 7-a water outlet; 8-a water discharge electromagnetic valve; 9-top cover plate.
Detailed Description
As shown in fig. 1, 2 and 3, the road material dry-wet and freeze-thaw cycle test device suitable for the supergravity centrifugal condition mainly comprises a test sleeve, a water inlet/outlet opening and closing valve set, a flowmeter 3, a displacement transducer (LVDT)4 suitable for high and low temperatures, a temperature control module 5 and a collection and filtration device 6.
The test sleeve is a cylinder made of rustproof steel and can be fixed on a model box of the centrifugal machine through bolts, a cover plate 9 is arranged at the top of the test sleeve, and O-shaped sealing rings are arranged on the cover plate 9 and the top of the sleeve and can seal the sleeve. The inner diameter of the sleeve is slightly larger than the diameter of the sample, for example, the inner diameter of the sleeve for the sample with the diameter of 100mm is 105mm, and meanwhile, an elastic rubber film is attached to the inner part of the sleeve and is sleeved on the sample, so that the soil sample can generate certain radial expansion deformation during the freeze-thaw cycle, and the rubber film can ensure the surrounding tightness and allow the radial deformation. The bottom of the sleeve is a porous metal plate for draining water to the bottom.
The water inlet/outlet opening/closing electromagnetic valve sets (a water inlet electromagnetic valve 2 and a water outlet electromagnetic valve 8) are respectively positioned at the top and the bottom of the test device, are connected with an external controller through a slip ring, and are used for controlling water inlet in the humidifying process and water outlet in the (melting) drying process of materials during the dry-wet and freeze-thaw cycle. Wherein water pipe accessible rotary joint lug connection outside tap of water inlet 1 department need not to connect the water storage tank, realizes multiple cycle.
The flowmeter 3 is positioned at the water inlet 1 and is connected with an external controller through a slip ring, so that the water inflow can be measured. Different water quantities are added according to the test requirements, and when the flow reaches the target water inflow, the electromagnetic valve of the water inlet is closed.
The displacement transducer (LVDT)4 is fixed in the top cover plate 9 of the test cartridge, the end is placed on top of the sample and connected to an external controller via a swivel joint for recording the axial deformation of the sample during the wet and dry freeze-thaw cycle.
The temperature control module 5 is positioned around the test sleeve, has a diameter slightly larger than that of the test sleeve and wraps the test sleeve. Meanwhile, the heat insulation layer is arranged inside the heat insulation pipe, so that heat loss can be reduced. The interlayer is filled with a liquid medium for temperature cycle control, and is connected with an external controller through a slip ring, so that the temperature control range is-10 ℃ to 60 ℃. Liquid enters the interlayer from the bottom of the left side during use and flows out from the upper part of the right side, so that effective heat transfer is guaranteed to be carried out inside the whole sleeve.
The collecting and filtering device 6 is positioned at the bottom of the test sleeve, is provided with an O-shaped sealing ring and is used for draining water by a water outlet 7 arranged at the bottom of the device downwards, a prototype groove is arranged above the water outlet 7, and a permeable stone is arranged in the groove and is used for filtering soil particles in a water body in a dry-wet and freeze-thaw cycle process. The drain port 7 is connected to a drain solenoid valve 8.
In order to explain the specific operation method of the device of the invention in more detail, the working principle of the device of the invention is explained by a freeze-thaw cycle test case of roadbed soil, and the specific steps are as follows:
(1) and manufacturing and mounting a sample. According to the test requirements, weighing a certain mass of soil, and forming a sample according to the target water content and pore ratio. And silicone oil is coated on the inner wall of the test sleeve for lubrication, so that the restriction of longitudinal deformation of the sample is reduced. And (3) sleeving the sample with a rubber film, and simultaneously ensuring that the length of the rubber film does not exceed the length of the sample. A permeable stone is placed at the top for stabilizing water flow and reducing impact on the top of the sample. Then put into a test sleeve, and a porous base is arranged to ensure that the porous base is in close contact with the bottom of the sample
(2) And installing a filtering device. A groove at the bottom of the filtering device is provided with a permeable stone, the surface of the filtering device is provided with an O-shaped sealing ring, the filtering device is connected with an upper test sleeve through a bolt, a bottom water outlet 7 is connected with a guide pipe, and a drainage electromagnetic valve 8 switch is arranged on the guide pipe to control drainage.
(3) And (5) mounting a displacement sensor. And (3) putting the LVDT displacement sensor 4 from the center of the cover plate 9 at the top of the sleeve, adjusting to a proper position, and resetting the reading of the displacement sensor to be used as the initial value of the deformation of the sample.
(4) And (4) humidifying. And opening the top water inlet electromagnetic valve 2, observing the reading of the flowmeter, calculating the water quantity to be added according to the water level required to be reached, and then closing the water inlet electromagnetic valve 2.
(5) And (5) freezing process. Setting a target centrifugal acceleration according to test requirements, and setting a target temperature value, such as-10 ℃, after the equipment reaches a stable centrifugal acceleration. After the temperature reaches the target value, the duration of the freezing process is controlled according to the similar proportion of the freezing and thawing time under the centrifugal condition, for example, 1 h.
(6) And (5) a melting process. After the target freezing time is reached, the thawing stage is started, the switch of the water outlet solenoid valve 8 (the water discharge solenoid valve 8) is opened, the water discharge stage is started, the target temperature is set, for example, 50 ℃, and similarly, the duration of the thawing and water discharge process is set according to a similar proportion, for example, 1 h. After which the drain solenoid valve 8 is closed. And in the drainage process after melting, calculating the permeability coefficient of the material by recording the change of the flow at the outlet.
(7) The number of cycles is increased. And (5) repeating the steps (4) to (6) according to the requirement of the test, and performing a plurality of cycles to record the variation of the displacement sensor (LVDT)4 in the whole process through a computer.
(8) The test was terminated and the amount of particle loss was recorded. After the test is completed, the operation of the centrifuge is stopped, after the standby device is completely stopped, the filtering and collecting device is disassembled, the sample is taken out, the device is washed, the filter screen with small pore diameter is used for filtering cleaning water, the collected particles are placed into a drying oven at 60 ℃ for drying, and after the drying is completely finished, the dry mass of the lost particles is obtained. After the cycle is completed, other tests such as strength and modulus may be performed according to the test requirements.
(9) It should be noted that the final state of the drainage is controlled by controlling the centrifugal acceleration of the centrifuge, different centrifugal accelerations correspond to different centrifugal forces, and a certain centrifugal force can discharge a certain amount of water in the soil sample until the substrate suction force in the soil body is equal to the centrifugal force; the corresponding volume water content under the substrate suction condition can be obtained through the soil-water characteristic curve of the soil sample, so that the aim of draining water according to the target volume water content by adjusting the centrifugal acceleration can be fulfilled, and the balance volume water content of the soil sample under the actual service condition is realized.
Claims (9)
1. The utility model provides a road material is wet and freeze-thaw cycle test device futilely suitable for under hypergravity centrifugation condition which characterized in that includes:
a test cartridge mounted on the centrifuge;
the temperature control module is wrapped on the test sleeve;
the top cover plate is arranged at the top of the test sleeve;
the bottom plate is arranged at the bottom of the test sleeve;
the water inlet is arranged at the top of the test sleeve and is communicated with the interior of the test sleeve;
the collecting and filtering device is arranged at the bottom of the test sleeve and is communicated with the interior of the test sleeve;
and a drain port in communication with the collection and filtration device.
2. The apparatus of claim 1, wherein the test sleeve is a stainless steel cylinder.
3. The apparatus for testing the drying, wetting and freezing-thawing cycle of road material under the centrifugal condition of supergravity as claimed in claim 1, wherein said bottom plate is a perforated metal plate.
4. The apparatus for testing the dryness, wetness, freezing and thawing cycle of road materials under the condition of supergravity centrifugation as claimed in claim 1, wherein said water inlet is communicated with the interior of said test sleeve through a water inlet solenoid valve, and said water inlet solenoid valve is disposed at the top of said test sleeve.
5. The apparatus for testing the drying, wetting, freezing and thawing cycle of road materials under the condition of the centrifugal force of the supergravity as claimed in claim 1, wherein a drain solenoid valve is connected to the drain port, and the drain solenoid valve is arranged at the bottom of the test sleeve.
6. The apparatus for testing the dryness, wetness, freezing and thawing cycle of road materials under the condition of supergravity centrifugation as claimed in claim 1, wherein said water inlet and outlet are provided with flow meters.
7. The apparatus for testing the dryness, wetness, freezing and thawing of road material under the condition of supergravity centrifugation as claimed in claim 1, wherein a displacement sensor is arranged in the test sleeve, one end of the displacement sensor is fixed on a top cover plate of the test sleeve, and the other end of the displacement sensor extends into the test sleeve.
8. The road material dry-wet and freeze-thaw cycle test device suitable for the hypergravity centrifugal condition according to claim 1, wherein an insulating layer is arranged on the outer side of the temperature control module, an interlayer is arranged between the insulating layer and the test sleeve, and a liquid medium is introduced into the interlayer for temperature control.
9. A road material dry-wet and freeze-thaw cycle test method is characterized in that the road material dry-wet and freeze-thaw cycle test device suitable for the supergravity centrifugal condition is adopted, and the method comprises the following steps:
a. the sample is shaped according to the target water content and the dry mass m of the sample is recorded 0 ；
b. Sleeving a rubber film on a sample, coating silicon oil on the surface to reduce friction, and placing the sample into a sample cylinder;
c. adding water into the cylinder according to the test target water level, setting a target centrifugal acceleration Ng, opening the centrifugal machine, and rotating to uniformly distribute the water in the sample;
d. setting target freezing temperature, if performing dry-wet cycle test, not setting the temperature, allowing the machine to continue running, and freezing the running time and simulated prototype structure of the materialAt a time of 1/N 2 If the dry-wet cycle test is carried out, the freezing time is the soaking time;
e. setting the melting temperature, opening a drainage switch to drain the sample cylinder, wherein the drainage time is 1/N of the melting and drainage time of the simulated material prototype structure 2 The relationship is such that,
f. repeating the steps c-e according to the requirement of the test on the number of dry-wet or freeze-thaw cycles;
g. recording the flow change of the flow meter in the process, collecting the amount of particles lost in the process of melting and draining through a collecting device, drying the collected particles to obtain the mass m 1 Calculating the material loss rate as
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Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923085A (en) * | 2010-07-06 | 2010-12-22 | 中交第二公路勘察设计研究院有限公司 | Multifunctional road soil roadbed freezing and thawing circulating test device |
| CN202185277U (en) * | 2011-05-23 | 2012-04-11 | 中国石油化工股份有限公司 | Sealed constant temperature high speed agitating cup for laboratory |
| CN102423678A (en) * | 2011-11-11 | 2012-04-25 | 沈阳创达技术交易市场有限公司 | Energy-saving reaction kettle |
| CN202562912U (en) * | 2012-04-20 | 2012-11-28 | 东北师范大学 | Layered temperature controlling soil freezing and thawing cycle test device |
| CN103275836A (en) * | 2013-03-28 | 2013-09-04 | 北京燕京啤酒股份有限公司 | Apparatus suitable for mechanical filtration of wort, and filtration method thereof |
| CN103743771A (en) * | 2013-12-04 | 2014-04-23 | 新疆农业大学 | Freeze-thawing circulation detection apparatus for nature saline soil |
| CN203643309U (en) * | 2013-12-16 | 2014-06-11 | 河海大学 | Temperature control corrosion test device |
| CN104142356A (en) * | 2014-06-26 | 2014-11-12 | 水利部交通运输部国家能源局南京水利科学研究院 | Centrifugal simulation system for freeze thawing deformation of water conveyance canal in salty-cold region |
| RU2586271C1 (en) * | 2015-01-12 | 2016-06-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Северный (Арктический) федеральный университет имени М.В. Ломоносова" (САФУ) | Device for determining frost boil and water permeability of soil during cyclic frost heave-thawing |
| CN106645633A (en) * | 2016-10-13 | 2017-05-10 | 桂林理工大学 | Deformation simulation device for expansion and shrinkage soil roadbed in dry and wet alternative environment and simulation method |
| CN106908472A (en) * | 2017-03-27 | 2017-06-30 | 安徽理工大学 | A kind of freeze-thaw cycle experiment device for being contemplated that water currents |
| CN106970200A (en) * | 2017-03-27 | 2017-07-21 | 安徽理工大学 | A kind of rock drying and watering cycle experimental provision of temperature-control pressure-control |
| CN107422107A (en) * | 2017-04-07 | 2017-12-01 | 中国路桥工程有限责任公司 | A kind of the roadbed material wetting-drying circular tester and its test method of high suction control |
| CN109342486A (en) * | 2018-10-09 | 2019-02-15 | 水利部交通运输部国家能源局南京水利科学研究院 | The experimental rig of the wet dry Frozen-thawed cycled of super gravity field Imitating expansive soil channel |
| CN109884110A (en) * | 2019-03-22 | 2019-06-14 | 辽宁工程技术大学 | A kind of laboratory testing rig and method for simulating subgrade engineering freeze-thaw damage phenomenon |
| CN110133218A (en) * | 2019-05-15 | 2019-08-16 | 水利部交通运输部国家能源局南京水利科学研究院 | The cold wet dry freeze of area's canal for water conveyance melts circular centrifugal simulation system and its analogy method |
| CN111366713A (en) * | 2020-03-27 | 2020-07-03 | 内蒙古大学 | Test device for simulating dry-wet cycle and freeze-thaw cycle of roadbed soil body |
| CN111982955A (en) * | 2020-07-30 | 2020-11-24 | 哈尔滨工业大学 | Unsaturated roadbed soil freeze-thaw cycle model test system |
| AU2020103936A4 (en) * | 2020-07-20 | 2021-02-11 | Central South University | Consolidation compression apparatus for testing wetting-drying cycle characteristics of expansive soil |
| CN112964855A (en) * | 2021-02-05 | 2021-06-15 | 合肥工业大学 | Test device and test method for rainfall-evaporation circulation and soil fracture characteristic measurement |
| US20210190672A1 (en) * | 2019-03-28 | 2021-06-24 | Qingdao university of technology | Device and method for dry-wet cycle simulation test of concrete in tidal zone and splash zone |
-
2022
- 2022-05-17 CN CN202210539509.8A patent/CN114965972A/en active Pending
Patent Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923085A (en) * | 2010-07-06 | 2010-12-22 | 中交第二公路勘察设计研究院有限公司 | Multifunctional road soil roadbed freezing and thawing circulating test device |
| CN202185277U (en) * | 2011-05-23 | 2012-04-11 | 中国石油化工股份有限公司 | Sealed constant temperature high speed agitating cup for laboratory |
| CN102423678A (en) * | 2011-11-11 | 2012-04-25 | 沈阳创达技术交易市场有限公司 | Energy-saving reaction kettle |
| CN202562912U (en) * | 2012-04-20 | 2012-11-28 | 东北师范大学 | Layered temperature controlling soil freezing and thawing cycle test device |
| CN103275836A (en) * | 2013-03-28 | 2013-09-04 | 北京燕京啤酒股份有限公司 | Apparatus suitable for mechanical filtration of wort, and filtration method thereof |
| CN103743771A (en) * | 2013-12-04 | 2014-04-23 | 新疆农业大学 | Freeze-thawing circulation detection apparatus for nature saline soil |
| CN203643309U (en) * | 2013-12-16 | 2014-06-11 | 河海大学 | Temperature control corrosion test device |
| CN104142356A (en) * | 2014-06-26 | 2014-11-12 | 水利部交通运输部国家能源局南京水利科学研究院 | Centrifugal simulation system for freeze thawing deformation of water conveyance canal in salty-cold region |
| RU2586271C1 (en) * | 2015-01-12 | 2016-06-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Северный (Арктический) федеральный университет имени М.В. Ломоносова" (САФУ) | Device for determining frost boil and water permeability of soil during cyclic frost heave-thawing |
| CN106645633A (en) * | 2016-10-13 | 2017-05-10 | 桂林理工大学 | Deformation simulation device for expansion and shrinkage soil roadbed in dry and wet alternative environment and simulation method |
| CN106908472A (en) * | 2017-03-27 | 2017-06-30 | 安徽理工大学 | A kind of freeze-thaw cycle experiment device for being contemplated that water currents |
| CN106970200A (en) * | 2017-03-27 | 2017-07-21 | 安徽理工大学 | A kind of rock drying and watering cycle experimental provision of temperature-control pressure-control |
| CN107422107A (en) * | 2017-04-07 | 2017-12-01 | 中国路桥工程有限责任公司 | A kind of the roadbed material wetting-drying circular tester and its test method of high suction control |
| CN109342486A (en) * | 2018-10-09 | 2019-02-15 | 水利部交通运输部国家能源局南京水利科学研究院 | The experimental rig of the wet dry Frozen-thawed cycled of super gravity field Imitating expansive soil channel |
| CN109884110A (en) * | 2019-03-22 | 2019-06-14 | 辽宁工程技术大学 | A kind of laboratory testing rig and method for simulating subgrade engineering freeze-thaw damage phenomenon |
| US20210190672A1 (en) * | 2019-03-28 | 2021-06-24 | Qingdao university of technology | Device and method for dry-wet cycle simulation test of concrete in tidal zone and splash zone |
| CN110133218A (en) * | 2019-05-15 | 2019-08-16 | 水利部交通运输部国家能源局南京水利科学研究院 | The cold wet dry freeze of area's canal for water conveyance melts circular centrifugal simulation system and its analogy method |
| CN111366713A (en) * | 2020-03-27 | 2020-07-03 | 内蒙古大学 | Test device for simulating dry-wet cycle and freeze-thaw cycle of roadbed soil body |
| AU2020103936A4 (en) * | 2020-07-20 | 2021-02-11 | Central South University | Consolidation compression apparatus for testing wetting-drying cycle characteristics of expansive soil |
| CN111982955A (en) * | 2020-07-30 | 2020-11-24 | 哈尔滨工业大学 | Unsaturated roadbed soil freeze-thaw cycle model test system |
| CN112964855A (en) * | 2021-02-05 | 2021-06-15 | 合肥工业大学 | Test device and test method for rainfall-evaporation circulation and soil fracture characteristic measurement |
Non-Patent Citations (2)
| Title |
|---|
| 王飞等: "干湿-冻融-行车荷载顺序耦合作用下道路水稳层变形试验研究", 《科学技术与工程》 * |
| 王飞等: "干湿-冻融-行车荷载顺序耦合作用下道路水稳层变形试验研究", 《科学技术与工程》, no. 29, 18 October 2018 (2018-10-18) * |
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