CN218782222U - Shrinkage and expansion simulation experiment equipment for concrete restoration test piece - Google Patents
Shrinkage and expansion simulation experiment equipment for concrete restoration test piece Download PDFInfo
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- CN218782222U CN218782222U CN202222925206.8U CN202222925206U CN218782222U CN 218782222 U CN218782222 U CN 218782222U CN 202222925206 U CN202222925206 U CN 202222925206U CN 218782222 U CN218782222 U CN 218782222U
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Abstract
The utility model discloses a contraction and expansion simulation experiment device of a concrete repair test piece, which comprises a closed box and a water circulation device used for adjusting the water level height in the closed box, wherein the closed box comprises a box body and a box cover matched with the box body, one side of the box cover facing the box body is provided with a pendant capable of hanging the concrete repair test piece, the box body is internally provided with an infrared distance measurement group used for measuring the length change of the concrete repair test piece, an ultraviolet lamp used for irradiating the concrete repair test piece and a heating device capable of providing radiant heat for the concrete repair test piece; the experimental equipment further comprises a calculating device and a control device, the calculating device calculates the expansion rate of the concrete repairing test piece according to data measured by the infrared distance measuring group, and the control device respectively controls the water circulation device, the ultraviolet lamp and the heating device. The utility model provides a shrinkage expansion simulation experiment equipment of concrete repair test piece can carry out the shrinkage expansion simulation of concrete repair test piece under the different environment.
Description
Technical Field
The utility model relates to a water conservancy and hydropower technical field especially relates to a shrinkage expansion simulation experiment equipment of concrete repair test piece.
Background
Concrete repair is an important factor for maintaining the service life of buildings, fundamentally coordinates the performance of concrete, and is a difficult problem to be researched and solved by more and more scholars. After the concrete stops curing, deformation can be generated due to the influence of some factors, such as drying shrinkage caused by drying dehydration, cold shrinkage caused by temperature reduction and the like, and if the deformation is not controlled, the concrete can crack when the deformation exceeds the deformation limit of the concrete. Therefore, concrete shrinkage is an important index of concrete durability, and is a volume deformation property inherent in the concrete hardening process. Meanwhile, a key problem of applying the repairing material to the existing concrete base material is that the repairing material is easy to generate cracks due to dry shrinkage and wet expansion so as to influence the bonding strength, so that the concrete shrinkage is also an important index influencing the repairing performance.
At present, a concrete linear expansion measuring instrument is mostly adopted when a shrinkage expansion experiment of a concrete repairing test piece is carried out. Namely, after the concrete repairing test piece is installed on the concrete linear expansion measuring instrument, the concrete repairing test piece is placed in an open natural environment. And then measuring the expansion/shrinkage rate of the test piece, the temperature and humidity of the current environment and other data at intervals.
However, the shrinkage-expansion test of the concrete repair test piece is usually performed in a natural environment, and since a normal natural environment is relatively stable, the shrinkage-expansion test of the existing concrete repair test piece cannot obtain shrinkage-expansion data of the concrete repair test piece in an extreme environment such as an extremely hot weather.
SUMMERY OF THE UTILITY MODEL
In view of the defects in the prior art, the utility model provides a contraction and expansion simulation experiment device for a concrete repair test piece, which comprises a closed box and a water circulation device for adjusting the water level height in the closed box, wherein the closed box comprises a box body and a box cover matched with the box body, one side of the box cover facing the box body is provided with a hanging piece capable of hanging the concrete repair test piece, an infrared distance measurement group for measuring the distance between the end surface of the concrete repair test piece in the length direction and the inner side wall of the box body is arranged in the box body, the infrared distance measurement group comprises two infrared distance meters respectively arranged on two inner side walls of the box body opposite to each other, and light rays emitted by the two infrared distance meters belonging to the same group are positioned on the same straight line; an ultraviolet lamp for irradiating the concrete repair test piece and a heating device capable of providing radiant heat for the concrete repair test piece are further arranged in the box body; the experimental equipment further comprises a calculating device and a control device, the calculating device calculates the expansion rate of the concrete repairing test piece according to data measured by the infrared distance measuring group, and the control device respectively controls the water circulation device, the ultraviolet lamp and the heating device so that the concrete repairing test piece generates different shrinkage expansion changes.
Preferably, the experimental equipment further comprises a monitoring fitting device, and the monitoring fitting device is used for collecting data measured by the infrared distance measurement group, fitting the data and transmitting the data to the computing device.
Preferably, a temperature monitoring device for monitoring temperature change of the concrete repairing test piece and a humidity monitoring device for monitoring humidity in the closed box are further arranged in the box body, and the control device can adjust the heating device and the water circulation device according to monitoring data of the temperature monitoring device and the humidity monitoring device.
Preferably, the water circle device includes the storage water tank, the storage water tank pass through water injection pipe and drinking-water pipe with the inner chamber intercommunication of seal box, be provided with first valve and water injection pump on the water injection pipe, first valve for the water injection pump is close to the seal box, be provided with second valve and suction pump on the drinking-water pipe, the second valve for the suction pump is close to the seal box, controlling means can control the water injection pump with the suction pump.
Preferably, the computing device and the control device are constructed as an integral structure.
Through the utility model provides a shrinkage and expansion simulation experiment equipment of concrete repair test piece can carry out the shrinkage and expansion simulation of concrete repair test piece under the different environment to the wet degree of expanding of the dry shrinkage of repairing the mortar provides diversified data support for survey.
Drawings
Fig. 1 is a schematic structural diagram of a shrinkage-expansion simulation experiment device of a concrete repair test piece according to an embodiment of the present invention;
fig. 2 is a schematic use diagram of the shrinkage and expansion simulation experiment equipment of the concrete repair test piece of the embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the same are merely exemplary and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
To the prior art problems mentioned in the background, the present invention provides the following detailed description.
The embodiment provides a shrinkage and expansion simulation experiment device for a concrete repair test piece, which comprises a closed box 1 and a water circulation device for adjusting the height of a water level in the closed box 1, as shown in fig. 1.
The water circulation device comprises a water storage tank 21, and the water storage tank 21 is communicated with the inner cavity of the closed box 1 through a water injection pipe 22 and a water pumping pipe 23. A first valve 24 and a water filling pump 25 are provided on the water filling pipe 22, and the first valve 24 is close to the closed box 1 relative to the water filling pump 25. The water pumping pipe 23 is provided with a second valve 26 and a water pumping pump 27, and the second valve 26 is close to the closed box 1 relative to the water pumping pump 27. Wherein, the junction between the water injection pump 25 and the seal box 1 and the junction between the suction pump 27 and the seal box 1 are both close to the bottom wall of the seal box 1.
Specifically, the closed box 1 comprises a box body 11 and a box cover 12 matched with the box body 11, wherein a hanging piece 13 capable of hanging a concrete repair test piece is arranged on one side, facing the box body 11, of the box cover 12.
The infrared distance measuring device comprises a box body 11, and is characterized in that an infrared distance measuring group used for measuring the distance between the end face of the concrete repair test piece in the length direction and the inner side wall of the box body 11 is arranged in the box body 11, and the infrared distance measuring group comprises two infrared distance measuring instruments 3 which are respectively arranged on two inner side walls of the box body 11, wherein the two inner side walls are opposite to each other. The light rays emitted by the two infrared distance meters 3 belonging to the same group are located on the same straight line. In a specific use process, when only one infrared distance measuring set is arranged, the light of the infrared distance measuring instrument 3 should preferably irradiate the boundary between the concrete base a and the repair mortar B of the concrete repair test piece on the end face of the concrete repair test piece (refer to the structure of the concrete repair test piece in fig. 2).
In order to improve the measurement accuracy of the expansion rate of the concrete repair test piece, the infrared distance measurement group of this embodiment may be provided with multiple groups, so that light spots irradiated by the infrared distance meters 3 on the end surface of the concrete repair test piece in the length direction are uniformly distributed on the end surface of the concrete repair test piece in the length direction (including the end surface of the concrete base a, the end surface of the repair mortar B, and the boundary line between the concrete base a and the repair mortar B), and thus an average value of multiple linear expansion scales of the concrete repair test piece can be obtained.
An ultraviolet lamp 4 for irradiating the concrete repair test piece and a heating device 5 capable of providing radiant heat for the concrete repair test piece are further arranged in the box body 11.
The experimental setup also comprises a calculation means 6 and a control means 7. And the calculating device 6 calculates the expansion rate of the concrete repair test piece according to the data measured by the infrared distance measuring group. The control device 7 can control the water injection pump 25, the water suction pump 27, the ultraviolet lamp 4 and the heating device 5, so that different shrinkage and expansion changes of the concrete repair test piece can be caused. Preferably, the computing device 6 and the control device 7 of the present embodiment are constructed as an integral structure, specifically, a computer.
The operation principle of the shrinkage expansion simulation experiment device of the concrete restoration test piece of the embodiment is specifically described below. As shown in fig. 2, after the prepared concrete repair specimen is hung on the hanger 13, the original length of the concrete repair specimen is measured. And then the water circulation device, the ultraviolet lamp 4 and the heating device 5 are adjusted according to the simulation situation to form a required simulation environment, so that the concrete repair test piece is subjected to corresponding shrinkage and expansion changes. And measuring the length of the concrete repairing test piece again and calculating to obtain the shrinkage expansion rate of the concrete repairing test piece. It should be noted here that the shrinkage expansion ratio in the present embodiment actually means a length change ratio of the concrete repair specimen.
In this embodiment, the shrinkage expansion ratio of the concrete repair test piece is obtained by the calculating device 6, and the specific calculation process of the calculating device 6 is as follows:
original length L = S- (J) of concrete repairing test piece 1 +J 2 ) Wherein L represents the original length of the concrete restoration test piece, S represents the distance between two infrared distance meters 3 of the same group, and J 1 Indicating a detected value, J, measured by an infrared distance meter 3 in the same group 2 Indicating the detected value detected by the other infrared distance meter 3 in the same group.
Based on the measurement mode, the length L of the concrete repairing test piece after shrinkage and expansion t ＝S-(J 3 +J 4 ) Wherein S denotes the distance between two infrared distance meters 3 of the same group, J 3 Indicating the detected value of an infrared distance meter 3 in the same group after the concrete repairing test piece is shrunk and expanded, J 4 And the detected value of the other infrared distance meter 3 in the same group after the concrete repairing test piece contracts and expands is shown.
Shrinkage expansion rate epsilon = (Lt-L)/L of concrete repair test piece
In order to obtain more objective data, in this embodiment, a plurality of infrared distance measurement sets may be set, and an average value of a plurality of contraction and expansion rates may be taken.
As above, the shrinkage and expansion simulation experiment device for the concrete repair test piece provided by the embodiment can simulate the shrinkage and expansion of the concrete repair test piece in different environments, so as to provide diversified data support for measuring the dry shrinkage and wet expansion degree of the repair mortar.
Further, the experimental apparatus of the present embodiment further includes a monitor fitting device 8. And the monitoring fitting device 8 is used for acquiring data measured by the infrared distance measurement group, fitting the data and transmitting the data to the computing device 6.
Furthermore, in order to more accurately adjust the simulated environment in the closed box 1, a temperature monitoring device (not shown in the figure) for monitoring the temperature change of the concrete repairing test piece and a humidity monitoring device (not shown in the figure) for monitoring the humidity in the closed box 1 are further arranged in the box body 11. The control device 7 can adjust the heating device 5 and the water circulation device according to the monitoring data of the temperature monitoring device and the humidity monitoring device.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A shrinkage and expansion simulation experiment device for a concrete restoration test piece is characterized by comprising a closed box and a water circulation device for adjusting the water level height in the closed box, wherein the closed box comprises a box body and a box cover matched with the box body, a hanging piece capable of hanging the concrete restoration test piece is arranged on one side of the box cover facing the box body, an infrared distance measurement group for measuring the distance between the end surface of the concrete restoration test piece in the length direction and the inner side wall of the box body is arranged in the box body, the infrared distance measurement group comprises two infrared distance meters respectively arranged on two inner side walls of the box body, which are opposite to each other, and light rays emitted by the two infrared distance meters belonging to the same group are positioned on the same straight line;
the box body is also internally provided with an ultraviolet lamp for irradiating the concrete repair test piece and a heating device capable of providing radiant heat for the concrete repair test piece;
the experimental equipment further comprises a calculating device and a control device, the calculating device calculates the expansion rate of the concrete repairing test piece according to data measured by the infrared distance measuring group, and the control device respectively controls the water circulation device, the ultraviolet lamp and the heating device so that the concrete repairing test piece generates different shrinkage expansion changes.
2. The contraction and expansion simulation experiment apparatus according to claim 1, further comprising a monitoring and fitting device, wherein the monitoring and fitting device is configured to collect data measured by the infrared distance measurement group, perform fitting, and transmit the data to the computing device.
3. The shrinkage-expansion simulation experiment equipment according to claim 1, wherein a temperature monitoring device for monitoring temperature changes of the concrete repair specimen and a humidity monitoring device for monitoring humidity in the closed box are further arranged in the box body, and the control device can adjust the heating device and the water circulation device according to monitoring data of the temperature monitoring device and the humidity monitoring device.
4. The contraction and expansion simulation experiment device according to claim 1, wherein the water circulation device comprises a water storage tank, the water storage tank is communicated with the inner cavity of the closed box through a water injection pipe and a water suction pipe, a first valve and a water injection pump are arranged on the water injection pipe, the first valve is close to the closed box relative to the water injection pump, a second valve and a water suction pump are arranged on the water suction pipe, the second valve is close to the closed box relative to the water suction pump, and the control device can control the water injection pump and the water suction pump.
5. The contraction-expansion simulation experiment apparatus according to any one of claims 1 to 4, wherein the computing device and the control device are constructed as a unitary structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222925206.8U CN218782222U (en) | 2022-11-03 | 2022-11-03 | Shrinkage and expansion simulation experiment equipment for concrete restoration test piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222925206.8U CN218782222U (en) | 2022-11-03 | 2022-11-03 | Shrinkage and expansion simulation experiment equipment for concrete restoration test piece |
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| CN218782222U true CN218782222U (en) | 2023-03-31 |
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| CN202222925206.8U Active CN218782222U (en) | 2022-11-03 | 2022-11-03 | Shrinkage and expansion simulation experiment equipment for concrete restoration test piece |
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- 2022-11-03 CN CN202222925206.8U patent/CN218782222U/en active Active
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