CN115711907A - Test device and test method for researching influence of freeze-thaw-dry-wet coupling on chloride ion permeability - Google Patents
Test device and test method for researching influence of freeze-thaw-dry-wet coupling on chloride ion permeability Download PDFInfo
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Abstract
The invention relates to a test device and a test method for researching influence of freeze thawing-dry-wet coupling on chloride ion permeability, wherein the test device comprises a test chamber, an inner cavity of the test chamber is divided into a test chamber for testing and a control chamber provided with a refrigeration structure, a bearing platform is arranged in the test chamber, the bearing platform is a liftable bearing platform, and baffles are symmetrically arranged on two inner side walls of the test chamber; the bearing platform ascends and descends in the direction vertical to the bottom surface of the test chamber, when the bearing platform descends to a preset height, the bottom surface of the bearing platform is in contact with the surface of the baffle, and the test chamber is divided into two closed spaces to provide a single-side freeze-thawing environment for the test piece; when the bearing platform rises to a preset height, the bottom surface of the bearing platform is separated from the surface of the baffle, and the two spaces in the test chamber are communicated to provide a dry-wet circulating environment for the test piece; the invention ensures that the test can be in an ideal coupling action environment, avoids the condition that the test piece is damaged in the transfer process, reduces the time cost of the test and lowers the economic cost.
Description
Technical Field
The invention relates to a test device and a test method for researching influence of freeze thawing-dry-wet coupling on chloride ion permeability, and belongs to the field of research of concrete durability tests.
Background
The 21 st century is the sea century, and the marine industry in China is rapidly developed. However, corrosion of the ocean is not occurring at all times, severely damaging the marine facilities upon which the blue economy develops. Researches show that under the action of the freeze-thaw cycle and the dry-wet cycle, the structural compactness, the crack form and the development degree of the structure are changed, so that the penetration of chloride ions in the structure is increased to different degrees, and the service life and the safe use of an ocean structure are seriously influenced.
At present, tests of freeze-thaw cycle and dry-wet cycle of concrete are respectively carried out by adopting a freeze-thaw machine and a dry-wet cycle test box, but tests designed by the dry-wet cycle test box are mostly continuous dry and wet, and in the actual engineering, because the effective wave height is seasonal variation, the environment where the concrete is located has the characteristic of discontinuous dry and wet action, namely, the concrete is discontinuously exposed to the dry-wet cycle condition, usually, the dry-wet cycle and the freeze-thaw cycle are in cross coupling on time, so that the traditional test box is not practical. If both need carry out the unilateral freeze thawing test of concrete sample, need carry out the dry-wet cycle test of concrete sample again, then need prepare two test machines, can't guarantee that the experiment can be in the coupling effect environment of ideal because of degree of automation is low, and the in-process that shifts at the test piece appears the test piece easily and damages, greatly increased experimental time cost and economic cost.
Disclosure of Invention
The invention provides a test device and a test method for researching the influence of freeze thawing-dry-wet coupling on chloride ion permeability, and realizes the test research on the concrete durability in a natural environment.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a test device for researching influence of freeze-thaw-dry-wet coupling on chloride ion permeability comprises a test box, wherein the test box can provide freeze-thaw and dry-wet conditions for a test piece;
the inner cavity of the test box is divided into a test chamber for testing and a control chamber provided with a refrigeration structure, a bearing platform is arranged in the test chamber and is a liftable bearing platform, the bearing platform is parallel to the bottom surface of the test chamber, baffles are symmetrically arranged on two inner side walls of the test chamber, and the baffles are also parallel to the bottom surface of the test chamber; in the direction parallel to the bottom surface of the test chamber, the distance formed between the two baffles is smaller than the length of the bearing platform;
the bearing platform ascends and descends in the direction vertical to the bottom surface of the test chamber, when the bearing platform descends to a preset height, the bottom surface of the bearing platform is in contact with the surface of the baffle, and the test chamber is divided into two closed spaces to provide a single-side freeze-thawing environment for the test piece; when the bearing platform rises to a preset height, the bottom surface of the bearing platform is separated from the surface of the baffle, and the two spaces in the test chamber are communicated to provide a dry-wet circulating environment for the test piece;
a water inlet is formed in the side wall of the test chamber, and a water outlet is formed in the bottom surface of the test chamber;
a plurality of infrared sensors which are sequentially arranged are further installed on one side wall of the test chamber, a dryer is installed at the top of the test chamber, and a heating device is installed on the bottom surface of the test chamber;
the refrigeration structure comprises a circulation loop consisting of an evaporator, a compressor and a condenser, namely, one port of the evaporator is communicated with one port of the compressor, the other port of the compressor is communicated with one port of the condenser, the other port of the condenser is communicated with the other port of the evaporator, and a filter and an expansion valve are sequentially arranged on a pipeline for communicating the condenser and the evaporator; the output port of the evaporator is communicated with the water inlet of the test chamber through a pipeline;
a water tank and a control cabinet are also arranged in the control chamber, the water tank is communicated with an input port of the evaporator, and the control cabinet is electrically connected with the refrigerating structure, the bearing platform, the infrared sensor, the dryer and the heating device;
the water outlet of the test chamber is communicated with the water tank, and the water tank is also communicated with the water tank through a pipeline;
as a further preferred aspect of the present invention,
the water outlet of the test chamber is opposite to the inlet of the water tank, the test chamber is communicated with the water tank through a second pipeline, and a water pump is installed on the second pipeline;
a water pump is arranged on a pipeline between the evaporator and the water inlet of the test chamber;
the water tank is communicated with the evaporator through a first pipeline;
as a further preferred aspect of the present invention, the platform installed in the test chamber is lifted by a telescopic rod;
the telescopic rods comprise two telescopic rods, and each telescopic rod is simultaneously and vertically arranged on the bearing platform and the bottom surface of the test chamber;
as a further preferred aspect of the present invention, sealing rubber strips are respectively disposed at positions of the bottom surface of the bearing platform close to the end portions, and a sealing rubber strip is disposed at a position of each baffle close to the bearing platform;
an insulating layer is coated on the inner wall of the test chamber;
as a further preferable aspect of the present invention, movable restraining means are provided at both end positions of the surface of the platform, respectively, and the restraining means are provided perpendicular to the surface of the platform;
when the test device is used for carrying out unilateral freeze-thaw test, the test method of the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability comprises the following steps:
step S11: placing a test piece on a bearing platform, and fixing the test piece on the surface of the bearing platform by moving a restraint device;
step S12: operating the control cabinet, starting the telescopic rod, sealing the sealing rubber strip on the bottom surface of the bearing platform and the sealing rubber strip on the surface of the baffle plate, and dividing the test chamber into two closed spaces;
step S13: refrigerating liquid in the water tank passes through the evaporator, the compressor, the condenser, the filter and the expansion valve and then returns to the evaporator again, at the moment, a water pump between the evaporator and the water inlet of the test chamber is started, and the cooled refrigerating liquid enters the test chamber from the water inlet of the test chamber;
step S14: when the refrigerating liquid injected into the closed space below the bearing platform in the test chamber reaches a preset height, triggering an infrared sensor positioned on the side wall of the test chamber, opening a water outlet of the test chamber, and enabling the refrigerating liquid to flow into a water tank to form liquid medium flowing circulation;
step S15: after the test piece is frozen for a preset time, the control cabinet sends a closing instruction to the refrigeration structure, and the water inlet is closed until all the refrigeration liquid in the test chamber flows into the water tank;
step S16: starting a water pump on the second pipeline, inputting the refrigerating liquid into the test chamber, sending an opening instruction to the heating device by the control cabinet, heating the refrigerating liquid in the test chamber to a preset temperature, and performing a unilateral freeze-thaw test on the test piece;
when the test device is used for carrying out a dry-wet cycle test, the test method for the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability comprises the following steps:
step S21: placing a test piece on a bearing platform, and fixing the test piece on the surface of the bearing platform by moving a restraint device;
step S22: operating the control cabinet, starting the telescopic rod to separate the sealing rubber strip on the bottom surface of the bearing platform from the sealing rubber strip on the surface of the baffle plate, and communicating two closed spaces divided in the test chamber;
step S23: starting a water pump on the second pipeline, inputting a saline solution into the test chamber, triggering an infrared sensor positioned on the side wall of the test chamber when the saline solution reaches a preset height, immersing the test piece in the saline solution, and closing the water pump on the second pipeline;
step S24: after the test piece is soaked in the saline solution for a preset time, a water outlet of the test chamber is opened, and the saline solution is conveyed to the water tank;
step S25: after the salt solution in the test chamber is completely discharged, opening a dryer, drying the test piece, and performing a dry-wet cycle test on the test piece;
the test method adopting the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability specifically comprises the following steps:
step S1: pouring a test piece by adopting concrete according to the structure diagram;
step S2: selecting a test piece reaching a preset age, placing the test piece into a test chamber, and performing a freeze-thaw-dry-wet cross coupling test by using the test method of claim 6 and claim 7, wherein the number of times of freeze-thaw test is set to be n times, and the number of times of dry-wet cycle test is set to be m times;
and step S3: and taking out the test piece after the freeze-thaw-dry-wet cross coupling test, testing the alternating current impedance between two adjacent titanium metal probes by using an alternating current impedance instrument, analyzing the resistivity of the layer of the pore solution, and judging the penetration depth of the chloride ions according to the difference degree of the resistivity.
9. The test method adopting the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability as claimed in claim 8 is characterized in that: the step of designing the test piece in the step S1 is that a titanium metal probe is inserted into a mould according to a fixed distance, and then concrete is poured into the mould;
defining the surface of the test piece as a test surface, and removing the rest surface of the test piece from the test surface and coating epoxy resin on the test piece;
in a further preferred embodiment of the present invention, in step S2, the number of freeze-thaw tests is set to n times, and the number of dry-wet cycle tests is set to m times, wherein the n times and the m times are set according to the number of year-round positive and negative temperature alternation of each coastal cold area counted by meteorological data.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the test device provided by the invention creates test conditions of cross coupling of freeze-thaw cycle and dry-wet cycle;
2. according to the test device provided by the invention, the automatic conversion of the freeze-thaw test and the dry-wet test can be realized by adjusting the height of the bearing platform in the same test device, so that the errors of manual operation can be effectively avoided;
3. the test device provided by the invention is based on the same test device, and can be used for adjusting the cycle times of the freeze-thaw test and the dry-wet test in one coupling test so as to truly and accurately simulate the climate conditions of different areas.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a perspective view of a preferred embodiment provided by the present invention;
FIG. 2 is a schematic view of a portion of a refrigeration structure provided by the present invention;
FIG. 3 is a schematic structural diagram of a unilateral freeze-thaw test performed by the testing device provided by the present invention;
FIG. 4 is a schematic structural diagram of a dry-wet cycle test performed by the test apparatus provided by the present invention;
FIG. 5 is a schematic view of a test piece structure provided by the present invention.
In the figure: the device comprises a test box 1, a test chamber 2, a water tank 3, a first pipeline 4, an evaporator 5, a compressor 6, an expansion valve 7, a filter 8, a condenser 9, a water pump 10, a restraint device 11, a bearing platform 12, a telescopic rod 13, a baffle 14, a sealing rubber strip 15, an infrared sensor 16, a control cabinet 17, a second pipeline 18, a heating device 19, a dryer 20, a heat-insulating layer 21, a test piece 22 and a titanium metal probe 23.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As set forth in the background art, at present, unilateral freeze-thaw test and dry-wet cycle test about concrete test piece are carried out through two testing machines, the operation mode is based on the research to the marine structure and is not generalized, however, with the rapid development of the marine industry in China, professional research needs to be carried out on the test piece, so the research of the application aims to provide a structure which combines the freeze-thaw test and the dry-wet cycle test, and meanwhile, the structure ensures certain accuracy.
As shown in fig. 1, the test device for studying the influence of freeze-thaw-dry-wet coupling on chloride ion permeability provided by the present application includes a test box 1, which is capable of providing freeze-thaw and dry-wet conditions for a test piece 22;
the inner cavity of the test box is divided into a test chamber 2 for testing and a control chamber provided with a refrigeration structure, a bearing platform 12 which is a liftable bearing platform is arranged in the test chamber, the bearing platform is parallel to the bottom surface of the test chamber, baffles 14 are symmetrically arranged on two inner side walls of the test chamber, and the baffles are also parallel to the bottom surface of the test chamber; in the direction parallel to the bottom surface of the test chamber, the distance formed between the two baffles is smaller than the length of the bearing platform;
the bearing platform ascends and descends in the direction vertical to the bottom surface of the test chamber, when the bearing platform descends to a preset height, the bottom surface of the bearing platform is in contact with the surface of the baffle, and the test chamber is divided into two closed spaces to provide a single-side freeze-thawing environment for the test piece; when the bearing platform rises to the preset height, the bottom surface of the bearing platform is separated from the surface of the baffle, and the two spaces in the test chamber are communicated to provide a dry-wet circulating environment for the test piece.
In other words, in the test device designed by the application, an important innovation point is that the device requirements of two tests are met only by lifting the bearing platform and combining the refrigeration structure. The test device designed by the application needs to be matched with the annual average positive and negative temperature alternation in coastal cold areas so as to switch between two test circulation modes, and the alternation of the positive and negative temperature difference calculated according to the year is not very frequent, so that the application simulates related test environments through the lifting of the bearing platform, and the actual use condition and the service life are completely met.
The concrete structures in the test device are described in detail, the structures are arranged to meet different test requirements, a water inlet is formed in the side wall of the test chamber, and a water outlet is formed in the bottom surface of the test chamber; one side wall of the test chamber is also provided with a plurality of infrared sensors 16 which are arranged in sequence, the top of the test chamber is provided with a dryer 20, and the bottom of the test chamber is provided with a heating device 19. As shown in fig. 2, the refrigeration structure includes a circulation circuit formed by an evaporator 5, a compressor 6 and a condenser 9, i.e., one port of the evaporator communicates with one port of the compressor, the other port of the compressor communicates with one port of the condenser, the other port of the condenser communicates with the other port of the evaporator, and a filter 8 and an expansion valve 7 are sequentially installed on a pipeline through which the condenser communicates with the evaporator; the output port of the evaporator is communicated with the water inlet of the test chamber through a pipeline;
the control chamber is also internally provided with a water tank 3 and a control cabinet 17, the water tank is communicated with an input port of the evaporator, a water outlet of the test chamber is communicated with the water tank, and the water tank is also communicated with the test chamber through a pipeline. The design of the control cabinet (located on the right side of the view angle of fig. 1) plays a role of sending an overall control command, a display screen, a power supply button, a refrigerating device button, a heating device button and a dryer button are designed on the control cabinet, and the lifting platform and the restraint device 11 are also controlled by knobs of the control cabinet respectively.
The test chamber is communicated with the water tank through a pipeline, namely a second pipeline 18, and the water pump 10 is arranged on the second pipeline; a water pump is arranged on a pipeline between the evaporator and the water inlet of the test chamber; the water tank is communicated with the evaporator through a first pipeline 4.
Because the bearing platform needs to realize the lifting function in order to meet the test requirements, the preferred embodiment provided by the application is that the bearing platform arranged in the test chamber is lifted through the telescopic rod 13; the telescopic link includes two, and every telescopic link all is perpendicular cushion cap, experimental chamber bottom surface setting simultaneously. The telescopic rod can comprise a hollow rod, a sliding rod is connected in the hollow rod in a sliding manner in a sliding block sliding groove in a matching and sliding manner, and the telescopic rod can slide up and down in the hollow rod to realize the telescopic effect.
Because during the experiment, the separation and the intercommunication of two airtight spaces in the experimental chamber are accomplished through the lift of cushion cap, especially when separating, need guarantee the zonulae occludens between cushion cap and the baffle, consequently set up sealing rubber strip 15 respectively in the position that the cushion cap bottom surface is close to the tip, the position that every baffle is close to the cushion cap all sets up sealing rubber strip.
The inner wall of the test chamber is covered with a heat-insulating layer 21, wherein the heat-insulating layer can be temperature-resistant rock wool or foam cotton.
When a test piece is placed on a bearing platform for testing, in order to ensure the stability of the test piece, two end parts of the surface of the bearing platform are respectively provided with a movable restraint device, the restraint devices are arranged perpendicular to the surface of the bearing platform, the distance between the two restraint devices can be adjusted to realize the limiting effect of the test piece, and the restraint devices can be plate-shaped structures made of the same material as the bearing platform.
Because the test device designed by the application needs to meet two test environments, the simulation methods of the two test environments are respectively analyzed, and as shown in fig. 3, when the test device is used for performing a unilateral freeze-thaw test, the method comprises the following steps:
step S11: placing a test piece on a bearing platform, and fixing the test piece on the surface of the bearing platform by moving a restraint device;
step S12: operating the control cabinet, starting the telescopic rod, sealing the sealing rubber strip on the bottom surface of the bearing platform and the sealing rubber strip on the surface of the baffle plate, and dividing the test chamber into two closed spaces;
step S13: refrigerating liquid in the water tank passes through the evaporator, the compressor, the condenser, the filter and the expansion valve and then returns to the evaporator again, at the moment, a water pump between the evaporator and the water inlet of the test chamber is started, and the cooled refrigerating liquid enters the test chamber from the water inlet of the test chamber;
step S14: when the refrigerating liquid injected into the closed space below the bearing platform in the test chamber reaches a preset height, triggering an infrared sensor positioned on the side wall of the test chamber, opening a water outlet of the test chamber, and enabling the refrigerating liquid to flow into a water tank to form liquid medium flowing circulation;
step S15: after the test piece is frozen for a preset time, the control cabinet sends a closing instruction to the refrigeration structure, and the water inlet is closed until all the refrigeration liquid in the test chamber flows into the water tank;
step S16: the water pump on the second pipeline is started, refrigerating liquid is input into the test chamber, the control cabinet sends an opening instruction to the heating device, the refrigerating liquid in the test chamber is heated to a preset temperature, and the unilateral freezing and thawing test of the test piece is carried out.
As shown in fig. 4, when the test apparatus is used for the dry-wet cycle test, the method comprises the following steps:
step S21: placing a test piece on a bearing platform, and fixing the test piece on the surface of the bearing platform by moving a restraint device;
step S22: operating the control cabinet, starting the telescopic rod to separate the sealing rubber strip on the bottom surface of the bearing platform from the sealing rubber strip on the surface of the baffle plate, and communicating two closed spaces divided in the test chamber;
step S23: starting a water pump on the second pipeline, inputting a saline solution into the test chamber, triggering an infrared sensor positioned on the side wall of the test chamber when the saline solution reaches a preset height, immersing the test piece in the saline solution, and closing the water pump on the second pipeline;
step S24: after the test piece is soaked in the saline solution for a preset time, a water outlet of the test chamber is opened, and the saline solution is conveyed to the water tank;
step S25: and after the salt solution in the test chamber is completely discharged, opening the dryer, drying the test piece, and performing a dry-wet cycle test on the test piece.
Finally, the test of the influence of freeze thawing-dry-wet coupling on the chloride ion permeability is carried out by adopting the test mode, before the test, the manufacturing method of the test piece is determined, the titanium metal probe 23 is inserted into the mold according to a fixed distance, and then concrete is poured into the mold to form the test piece shown in figure 5; the surface of the test piece is defined as a test surface, and the rest surface of the test piece except the test surface is coated with epoxy resin. The test specifically comprises the following steps:
step S1: pouring a test piece by adopting concrete according to the structure diagram;
step S2: selecting a test piece reaching a preset age, putting the test piece into a test chamber, and performing a freeze-thaw-dry-wet cross coupling test by using the test method in claims 6 and 7, wherein the number of times of the freeze-thaw test is set to be n, the number of times of the dry-wet cycle test is set to be m, and n and m are set according to the number of times of the year-round positive and negative temperature alternation of each coastal cold area counted by meteorological data;
and step S3: and taking out the test piece after the freeze thawing-dry-wet cross coupling test, testing the alternating current impedance between two adjacent titanium metal probes by using an alternating current impedance instrument, analyzing the resistivity of the layer of the pore solution, and judging the penetration depth of the chloride ions according to the difference degree of the resistivity.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components through other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A test device for researching influence of freeze thawing-dry-wet coupling on chloride ion permeability is characterized in that: the test box can provide freeze thawing, dry and wet conditions for a test piece;
the inner cavity of the test box is divided into a test chamber for testing and a control chamber provided with a refrigeration structure, a bearing platform which is a liftable bearing platform is arranged in the test chamber, the bearing platform is parallel to the bottom surface of the test chamber, baffles are symmetrically arranged on two inner side walls of the test chamber, and the baffles are also parallel to the bottom surface of the test chamber; in the direction parallel to the bottom surface of the test chamber, the distance formed between the two baffles is smaller than the length of the bearing platform;
the bearing platform ascends and descends in the direction vertical to the bottom surface of the test chamber, when the bearing platform descends to a preset height, the bottom surface of the bearing platform is in contact with the surface of the baffle, and the test chamber is divided into two closed spaces to provide a single-side freeze-thawing environment for the test piece; when the bearing platform rises to a preset height, the bottom surface of the bearing platform is separated from the surface of the baffle, and the two spaces in the test chamber are communicated to provide a dry-wet circulating environment for the test piece;
a water inlet is formed in the side wall of the test chamber, and a water outlet is formed in the bottom surface of the test chamber;
a plurality of infrared sensors which are sequentially arranged are further installed on one side wall of the test chamber, a dryer is installed at the top of the test chamber, and a heating device is installed on the bottom surface of the test chamber;
the refrigeration structure comprises a circulation loop consisting of an evaporator, a compressor and a condenser, namely, one port of the evaporator is communicated with one port of the compressor, the other port of the compressor is communicated with one port of the condenser, the other port of the condenser is communicated with the other port of the evaporator, and a filter and an expansion valve are sequentially arranged on a pipeline for communicating the condenser and the evaporator; the output port of the evaporator is communicated with the water inlet of the test chamber through a pipeline;
a water tank and a control cabinet are also arranged in the control chamber, the water tank is communicated with an input port of the evaporator, and the control cabinet is electrically connected with the refrigerating structure, the bearing platform, the infrared sensor, the dryer and the heating device;
the water outlet of the test chamber is communicated with the water tank, and the water tank is also communicated with the water tank through a pipeline.
2. The test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability according to claim 1, is characterized in that:
the water outlet of the test chamber is opposite to the inlet of the water tank, the test chamber is communicated with the water tank through a second pipeline, and a water pump is installed on the second pipeline;
a water pump is arranged on a pipeline between the evaporator and the water inlet of the test chamber;
the water tank is communicated with the evaporator through a first pipeline.
3. The test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability according to claim 2, characterized in that: a bearing platform arranged in the test chamber is lifted through a telescopic rod;
the telescopic link includes two, and every telescopic link all perpendicular cushion cap, experimental chamber bottom surface setting simultaneously.
4. The test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability according to claim 3, wherein: sealing rubber strips are respectively arranged at the positions, close to the end parts, of the bottom surface of the bearing platform, and each baffle plate is provided with a sealing rubber strip at the position, close to the bearing platform;
and an insulating layer is coated on the inner wall of the test chamber.
5. The test device for studying the influence of freeze-thaw-dry-wet coupling on chloride ion permeability according to claim 4, wherein: and movable restraining devices are respectively arranged at two end positions of the surface of the bearing platform, and the restraining devices are arranged perpendicular to the surface of the bearing platform.
6. The test method adopting the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability, disclosed by claim 5, is characterized in that: when the test device is adopted to carry out unilateral freeze-thaw test, the method comprises the following steps:
step S11: placing a test piece on a bearing platform, and fixing the test piece on the surface of the bearing platform by moving a restraint device;
step S12: operating the control cabinet, starting the telescopic rod, sealing the sealing rubber strip on the bottom surface of the bearing platform and the sealing rubber strip on the surface of the baffle plate, and dividing the test chamber into two closed spaces;
step S13: refrigerating liquid in the water tank returns to the evaporator again after passing through the evaporator, the compressor, the condenser, the filter and the expansion valve, at the moment, a water pump between the evaporator and the water inlet of the test chamber is started, and the cooled refrigerating liquid enters the test chamber from the water inlet of the test chamber;
step S14: when the refrigerating liquid injected into the closed space below the bearing platform in the test chamber reaches a preset height, triggering the infrared sensor positioned on the side wall of the test chamber, opening a water outlet of the test chamber, and enabling the refrigerating liquid to flow into the water tank to form liquid medium flowing circulation;
step S15: after the test piece is frozen for a preset time, the control cabinet sends a closing instruction to the refrigeration structure, and the water inlet is closed until all the refrigeration liquid in the test chamber flows into the water tank;
step S16: the water pump on the second pipeline is started, refrigerating liquid is input into the test cavity, the control cabinet sends an opening instruction to the heating device, the refrigerating liquid in the test cavity is heated to a preset temperature, and the unilateral freeze thawing test of the test piece is carried out.
7. The test method adopting the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability, disclosed by claim 5, is characterized in that: when the test device is used for carrying out a dry-wet cycle test, the method comprises the following steps:
step S21: placing a test piece on a bearing platform, and fixing the test piece on the surface of the bearing platform by moving a restraint device;
step S22: operating the control cabinet, starting the telescopic rod to separate the sealing rubber strip on the bottom surface of the bearing platform from the sealing rubber strip on the surface of the baffle plate, and communicating two closed spaces divided in the test chamber;
step S23: starting a water pump on the second pipeline, inputting a saline solution into the test chamber, triggering an infrared sensor positioned on the side wall of the test chamber when the saline solution reaches a preset height, immersing the test piece in the saline solution, and closing the water pump on the second pipeline;
step S24: after the test piece is soaked in the saline solution for a preset time, a water outlet of the test chamber is opened, and the saline solution is conveyed to the water tank;
step S25: and after the salt solution in the test chamber is completely discharged, opening the dryer, drying the test piece, and performing a dry-wet cycle test on the test piece.
8. The test method using the test device for studying the influence of freeze-thaw-dry-wet coupling on chloride ion permeability according to claim 6 or 7 is characterized in that: the method specifically comprises the following steps:
step S1: pouring a test piece by adopting concrete according to the structure diagram;
step S2: selecting a test piece reaching a preset age, placing the test piece into a test chamber, and performing a freeze-thaw-dry-wet cross coupling test by using the test method of claim 6 and claim 7, wherein the number of times of freeze-thaw test is set to be n times, and the number of times of dry-wet cycle test is set to be m times;
and step S3: and taking out the test piece after the freeze thawing-dry-wet cross coupling test, testing the alternating current impedance between two adjacent titanium metal probes by using an alternating current impedance instrument, analyzing the resistivity of the layer of the pore solution, and judging the penetration depth of the chloride ions according to the difference degree of the resistivity.
9. The test method adopting the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability as claimed in claim 8 is characterized in that: the step of designing the test piece in the step S1 is that a titanium metal probe is inserted into a mould according to a fixed distance, and then concrete is poured into the mould;
the surface of the test piece is defined as a test surface, and the rest surface of the test piece except the test surface is coated with epoxy resin.
10. The test method adopting the test device for researching the influence of freeze-thaw-dry-wet coupling on chloride ion permeability, disclosed by claim 8, is characterized in that: in the step S2, the number of times of the freeze-thaw test is set to be n times, the number of times of the dry-wet cycle test is set to be m times, wherein the n times and the m times are set according to the number of times of the year-round average positive and negative temperature alternation of each coastal cold area counted by meteorological data.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115420605A (en) * | 2022-09-15 | 2022-12-02 | 中国石油大学(华东) | Experimental device and method for transmitting chloride ions in concrete with temperature difference on two sides |
| CN115420605B (en) * | 2022-09-15 | 2024-07-30 | 中国石油大学(华东) | Experimental device and method for transporting chloride ions in concrete with temperature difference at two sides |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115420605A (en) * | 2022-09-15 | 2022-12-02 | 中国石油大学(华东) | Experimental device and method for transmitting chloride ions in concrete with temperature difference on two sides |
| CN115420605B (en) * | 2022-09-15 | 2024-07-30 | 中国石油大学(华东) | Experimental device and method for transporting chloride ions in concrete with temperature difference at two sides |
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