CN209841753U - Freeze thawing cycle exposure test device - Google Patents
Freeze thawing cycle exposure test device Download PDFInfo
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- CN209841753U CN209841753U CN201920715435.2U CN201920715435U CN209841753U CN 209841753 U CN209841753 U CN 209841753U CN 201920715435 U CN201920715435 U CN 201920715435U CN 209841753 U CN209841753 U CN 209841753U
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Abstract
The utility model discloses a freeze thawing cycle exposure test device, including the guarantor's water type electro-heat equipment that can twine at the test piece surface to and the power supply unit who is connected with guarantor's water type electro-heat equipment, guarantor's water type electro-heat equipment includes waterproof heating wire and water blanket. The utility model directly winds the surface of the test piece through the water-retaining electric heating device to unfreeze, the water-retaining electric heating device is composed of a waterproof heating wire and a water-retaining blanket, the complex design of the traditional freeze thawing test device is abandoned, the structure is simple, the cost is extremely low, and the operation is simple; the waterproof electric heating wire and the water retention blanket can be suitable for various sizes, and simultaneously meet the requirements of freeze-thaw cycle of large-size test pieces and small-size test pieces; the freeze-thaw cycle exposure test device can be directly placed outdoors, freezing is realized by utilizing the natural environment air temperature, the problem of monotonous temperature change in an indoor rapid freeze-thaw cycle test is avoided, the time-varying effect of the real environment temperature is fully reflected, and the problem that the size, the shape and the service site of a test piece are limited is solved.
Description
Technical Field
The utility model relates to a civil engineering test equipment technical field, in particular to freeze thawing cycle exposure test device.
Background
The reinforced concrete structure is the most widely used engineering structure in the world at present, but the reinforced concrete structure in service for a long time in northern areas usually causes durability damage due to freeze-thaw cycles, so that a large amount of reinforced concrete engineering structures are damaged before the designed service life is reached. The method researches the mechanism of the concrete structure durability damage caused by freeze-thaw cycle, and explores the method and measure for preventing and controlling freeze-thaw cycle, and has important significance for improving the concrete structure durability and prolonging the service life of the concrete structure.
The rapid freezing and thawing cycle test simulates the temperature change in the natural environment by rapidly changing the temperature of the test piece. But in fact, the natural climate conditions of various regions are different, the temperature change of the test piece in the indoor rapid freezing and thawing test is too monotonous, and the temperature time-varying characteristic of a specific region cannot be reflected; in addition, most of indoor freeze-thaw testing machines are only suitable for freeze-thaw cycle tests of test pieces or test blocks with small sizes, and the requirements of the freeze-thaw cycle tests of test pieces with large sizes are difficult to meet.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exist among the prior art, provide a freeze thawing cycle exposes test device.
In order to achieve the purpose of the invention, the utility model provides the following technical scheme:
the utility model provides a freeze thawing cycle exposure test device, including can twine the guarantor's water type electro-heat equipment on test piece surface, and with the power supply unit that guarantor's water type electro-heat equipment is connected, guarantor's water type electro-heat equipment includes waterproof heating wire and guarantor's water blanket. The water-retaining blanket is a blanket-shaped structure with good water-retaining property, the waterproof electric heating wire is an electric heating wire subjected to waterproof treatment, and the waterproof electric heating wire can be directly and uniformly fixed on the water-retaining blanket.
The utility model discloses direct winding is unfreezed on the test piece surface through guarantor's water type electric heating device, guarantor's water type electric heating device comprises waterproof heating wire and guarantor's water blanket, has abandoned traditional freeze thawing test device's complicated design, simple structure, and the cost is extremely low, easy operation. And the waterproof electric heating wire and the water retention blanket can be suitable for various sizes, and simultaneously meet the requirements of freeze-thaw cycle of large-size test pieces and small-size test pieces.
Further, freeze thawing cycle exposure test device can directly place outdoors, utilize natural environment temperature to realize freezing, avoided the problem of the monotonous change of temperature in indoor quick freeze thawing cycle test, fully reflected real ambient temperature's time-varying effect, solved test piece size, shape and the limited problem in labour place.
The utility model discloses utilize guarantor's water type electric heating equipment to overcome the natural environment constraint that freezes winter, spring unfreezes, solve among the freeze-thaw cycle exposure test piece and be difficult to realize the problem of unfreezing many times under the low temperature condition, improved freeze-thaw cycle exposure test's freeze thawing efficiency.
Preferably, the water retention blanket comprises blanket-shaped structures with good water retention property, such as geotextile, felt, concrete curing cloth and the like.
Preferably, a plurality of temperature sensors are arranged on the surface of the test piece, and the temperature sensors are used for measuring the temperature of the surface of the test piece so as to judge the freezing state and the thawing state of the test piece.
Preferably, all the temperature sensors are uniformly distributed on the surface of the test piece, so that the temperature change of each position of the test piece can be fully reflected, and the precision is ensured.
Preferably, all the temperature sensors are connected with switches, the switches are temperature control switches, and the switches are used for controlling the opening and closing of the waterproof electric heating wires.
The utility model discloses utilize temperature sensor and temperature detect switch to cooperate, realize the automatic start-stop of waterproof heating wire to freeze thawing cycle's automation has been realized and has been gone on. When the temperatures of all the temperature sensors reach a preset freezing standard, the temperature control switch is automatically turned on, and the waterproof electric heating wire is electrified and unfreezes the test piece; and when the temperatures of all the temperature sensors reach the preset thawing standard, the temperature control switch is automatically closed, and the waterproof electric heating wire stops heating. And the preset freezing standard and the preset unfreezing standard are set according to the test requirements.
Preferably, the switch is a temperature time controller. When the temperatures of all the temperature sensors reach a preset freezing standard and the freezing time of the test piece reaches a minimum time interval, the temperature and time controller is automatically started, and the waterproof electric heating wire is electrified and unfreezes the test piece. The freezing standard and the minimum time interval are preset for double setting, so that the parameter control of the whole freezing-thawing cycle is realized. The minimum time interval is set according to the test requirements.
Preferably, the switch is connected with a counter, and the counter records once each time a freeze-thaw cycle is completed until the required number of freeze-thaw cycles is reached.
Preferably, the power supply device comprises an energy storage device and a solar panel connected with the energy storage device. Preferably, the energy storage device is a storage battery. The utility model discloses realize the unfreezing of test piece with the help of solar photovoltaic electrical heating, practiced thrift the experimental power consumption of freeze thawing cycle greatly.
The utility model also discloses a freeze-thaw cycle exposure test method, including following step:
the method comprises the following steps: winding a water-retention type electric heating device on the surface of the test piece, connecting the waterproof electric heating wire with a power supply device, wetting a water-retention blanket, and then placing the test piece outdoors;
step two: freezing the test piece by means of low outdoor temperature;
step three: when the freezing temperature of the test piece reaches a preset freezing standard, opening the waterproof electric heating wire to unfreeze the test piece;
step four: when the test piece is thawed to a preset thawing standard, the waterproof electric heating wire is closed, and the test piece completes one round of freezing and thawing;
step five: and repeating the second step to the fourth step, and enabling the test piece to enter a new round of freeze thawing until the number of freeze thawing cycles required by the test is reached.
The test method of the utility model freezes the test piece by using natural conditions, and fully reflects the time-varying effect of the real environment temperature, thereby improving the accuracy of the test result and providing technical reference for the engineering structure durability research in cold regions; the waterproof electric heating wire is utilized for unfreezing, so that the natural environment constraint of freezing in winter and unfreezing in spring is overcome, the times of a freeze-thaw cycle exposure test are increased, and the freeze-thaw cycle efficiency is improved.
Preferably, a plurality of temperature sensors are installed on the surface of the test piece, all the temperature sensors are connected with a switch, the switch is a temperature control switch, the switch is connected with the waterproof heating wire, in the third step, when the temperatures of all the temperature sensors reach a preset freezing standard, the switch is automatically turned on, the waterproof heating wire is electrified and unfreezes the test piece, in the fourth step, when the temperatures of all the temperature sensors reach a preset unfreezing standard, the switch is automatically turned off, and the waterproof heating wire stops heating.
Preferably, the switch is a temperature time controller. When the temperatures of all the temperature sensors reach a preset freezing standard and the freezing time of the test piece reaches a minimum time interval, the temperature and time controller is automatically started, and the waterproof electric heating wire is electrified and unfreezes the test piece. Assuming a minimum time interval n, which is set according to the test requirements in order to ensure complete freezing of the test piece, the switch is automatically switched on for the second time at least after a time n, i.e. at least at a + n, assuming that the switch is automatically switched on for the first time at time a. The freezing standard and the minimum time interval are preset for double setting, so that the parameter control of the whole freezing-thawing cycle is realized.
Preferably, the power supply device comprises an energy storage device and a solar panel connected with the energy storage device, during the freezing period of the test piece outdoors in the second step, the solar panel converts solar energy into electric energy to be stored in a storage battery, and the stored electric energy is used for the waterproof electric heating wire to unfreeze the test piece in the third step.
Compared with the prior art, test device's beneficial effect:
the utility model discloses direct winding is unfreezed on the test piece surface through guarantor's water type electric heating device, guarantor's water type electric heating device comprises waterproof heating wire and guarantor's water blanket, has abandoned traditional freeze thawing test device's complicated design, simple structure, and the cost is extremely low, easy operation. And the waterproof electric heating wire and the water retention blanket can be suitable for various sizes, and simultaneously meet the requirements of freeze-thaw cycle of large-size test pieces and small-size test pieces.
Further, freeze thawing cycle exposure test device can directly place outdoors, utilize natural environment temperature to realize freezing, avoided the problem of the monotonous change of temperature in indoor quick freeze thawing cycle test, fully reflected real ambient temperature's time-varying effect, solved test piece size, shape and the limited problem in labour place.
The utility model discloses utilize guarantor's water type electric heating equipment to overcome the natural environment constraint that freezes winter, spring unfreezes, solve among the freeze-thaw cycle exposure test piece and be difficult to realize the problem of unfreezing many times under the low temperature condition, improved freeze-thaw cycle exposure test's freeze thawing efficiency.
Compared with the prior art, test method's beneficial effect:
the test method of the utility model freezes the test piece by using natural conditions, and fully reflects the time-varying effect of the real environment temperature, thereby improving the accuracy of the test result and providing technical reference for the engineering structure durability research in cold regions; the waterproof electric heating wire is utilized for unfreezing, so that the natural environment constraint of freezing in winter and unfreezing in spring is overcome, the times of a freeze-thaw cycle exposure test are increased, and the freeze-thaw cycle efficiency is improved.
Description of the drawings:
fig. 1 is a schematic structural diagram of a freeze-thaw cycle exposure testing apparatus according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a freeze-thaw cycle exposure testing apparatus according to embodiment 2 of the present invention.
The labels in the figure are: the solar water heater comprises a solar cell panel 1, a mounting box 2, a switch 3, a counter 4, an energy storage device 5, a support 6, a water-retaining electric heating device 7, a test piece 8, a temperature sensor 9 and a lead 10.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, a freeze-thaw cycle exposure test device comprises a water-retention type electric heating device 7 capable of being wound on the surface of a test piece 8, and a power supply device connected with the water-retention type electric heating device 7.
The water retention type electric heating device 7 comprises a waterproof heating wire and a water retention blanket, the water retention blanket comprises blanket-shaped structures with good water retention property, such as geotextile, felt, concrete maintenance cloth and the like, and the waterproof heating wire can be directly and uniformly fixed on the water retention blanket.
The power supply device comprises an energy storage device 5 and a solar panel 1 connected with the energy storage device 5. The energy storage device 5 is located in the installation box 2, and the installation box 2 and the solar cell panel 1 are arranged on the support 6. The energy storage device 5 is connected with the waterproof electric heating wire through a lead 10, and a switch 3 for controlling the waterproof electric heating wire to be opened and closed is arranged.
The freeze-thaw cycle exposure test device is used for testing and comprises the following steps:
the method comprises the following steps: installing a solar panel 1 and an energy storage device 5;
step two: winding a water-retention type electric heating device 7 on the surface of a test piece 8, connecting the waterproof electric heating wire with an energy storage device 5, wetting a water-retention blanket, and then placing the test piece 8 outdoors;
step three: freezing the test piece 8 by means of low outdoor temperature, and simultaneously generating power by the solar panel 1 and storing the power in the energy storage device 5;
step four: when the freezing temperature of the test piece 8 reaches a preset freezing standard, a switch 3 is turned on, the waterproof electric heating wire is electrified, the test piece 8 is unfrozen, and the preset freezing standard is set according to test requirements;
step five: when the test piece 8 is thawed to a preset thawing standard, the switch 3 is turned off, the waterproof electric heating wire stops heating, the test piece 8 completes one round of freezing and thawing, and the preset thawing standard is set according to test requirements;
step six: and repeating the third step and the fifth step, and enabling the test piece 8 to enter a new round of freeze thawing until the number of freeze thawing cycles required by the test is reached.
Example 2
The difference between this embodiment and embodiment 1 is that this embodiment can realize automatic freeze-thaw cycling of the test piece 8 without manually turning on and off the switch 3.
Specifically, as shown in fig. 2, the freeze-thaw cycle exposure testing apparatus further includes a plurality of temperature sensors 9 arranged on the surface of the test piece 8, all the temperature sensors 9 are connected to a switch 3, the switch 3 is a temperature control switch, the switch 3 is further connected to a counter 4, and the counter 4 records once when the switch 3 is turned on.
The freeze-thaw cycle exposure test device is used for testing and comprises the following steps:
the method comprises the following steps: installing a solar panel 1 and an energy storage device 5;
step two: winding a water-retention type electric heating device 7 on the surface of a test piece 8, connecting the waterproof electric heating wire with an energy storage device 5, wetting a water-retention blanket, and then placing the test piece 8 outdoors;
step three: freezing the test piece 8 by means of low outdoor temperature, and simultaneously generating power by the solar panel 1 and storing the power in the energy storage device 5;
step four: when the temperatures of all the temperature sensors 9 reach a preset freezing standard, the temperature control switch is automatically turned on, the waterproof electric heating wire is electrified, the test piece 8 is unfrozen, and the preset freezing standard is set according to test requirements;
step five: when the temperatures of all the temperature sensors 9 reach a preset thawing standard, the temperature control switch is automatically turned off, the waterproof electric heating wire stops heating, the test piece 8 completes one round of freeze thawing, the counter 4 records once, and the preset thawing standard is set according to test requirements;
step six: and repeating the third step and the fifth step, and enabling the test piece 8 to enter a new round of freeze thawing until the number of freeze thawing cycles required by the test is reached.
Preferably, the switch 3 is a temperature time controller, and in the fourth step, when the temperatures of all the temperature sensors 9 reach a preset freezing standard and the freezing time of the test piece 8 reaches a minimum time interval, the switch 3 is automatically turned on, and the waterproof electric heating wire is electrified and unfreezes the test piece 8. The preset freezing standard and the minimum time interval are set according to test requirements.
The above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement may be made to the present invention; all technical solutions and modifications without departing from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a freeze-thaw cycle exposure test device, its characterized in that, including can twine guarantor's water type electro-heat equipment (7) on test piece (8) surface, and with the power supply unit that guarantor's water type electro-heat equipment (7) are connected, guarantor's water type electro-heat equipment (7) include waterproof heating wire and water blanket.
2. A freeze-thaw cycle exposure test apparatus according to claim 1, wherein the water retention blanket comprises geotextile, felt, and concrete curing cloth.
3. A freeze-thaw cycle exposure test apparatus according to claim 1, wherein a plurality of temperature sensors (9) are arranged on the surface of the test piece (8).
4. A freeze-thaw cycle exposure test apparatus according to claim 3, wherein all the temperature sensors (9) are uniformly distributed on the surface of the test piece (8).
5. A freeze-thaw cycle exposure test device according to claim 3, wherein all the temperature sensors (9) are connected with a switch (3), the switch (3) is a temperature control switch, and the switch (3) is used for controlling the on/off of the waterproof electric heating wire.
6. A freeze/thaw cycle exposure test apparatus according to claim 5, wherein the switch (3) is a temperature time controller.
7. A freeze/thaw cycle exposure test apparatus according to claim 5, wherein a counter (4) is connected to the switch (3).
8. A freeze/thaw cycle exposure test apparatus according to any one of claims 1-7, wherein the power supply means comprises an energy storage means (5), and a solar panel (1) connected to the energy storage means (5).
9. A freeze/thaw cycle exposure test apparatus according to claim 8, wherein the energy storage device (5) is a battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920715435.2U CN209841753U (en) | 2019-05-17 | 2019-05-17 | Freeze thawing cycle exposure test device |
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| CN201920715435.2U CN209841753U (en) | 2019-05-17 | 2019-05-17 | Freeze thawing cycle exposure test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991279A (en) * | 2019-05-17 | 2019-07-09 | 宁夏大学 | A kind of Frozen-thawed cycled exposure test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991279A (en) * | 2019-05-17 | 2019-07-09 | 宁夏大学 | A kind of Frozen-thawed cycled exposure test device and test method |
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