CN113063671A - Device and method for measuring temperature and humidity of concrete under action of constant axial tension - Google Patents
Device and method for measuring temperature and humidity of concrete under action of constant axial tension Download PDFInfo
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- CN113063671A CN113063671A CN202110291458.7A CN202110291458A CN113063671A CN 113063671 A CN113063671 A CN 113063671A CN 202110291458 A CN202110291458 A CN 202110291458A CN 113063671 A CN113063671 A CN 113063671A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0694—Temperature
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Abstract
The invention relates to a device and a method for measuring the temperature and humidity of concrete under the action of constant axial tension, which comprises a loading frame, wherein the loading frame comprises a first upright post and a second upright post, the upper end of the first upright post is hinged with a lever, the lever comprises a front arm and a rear arm, the length of the front arm is smaller than that of the rear arm, a Z-shaped transmission device is hinged on one side wall of the first upright post, one end of the Z-shaped transmission device is connected with the end part of the front arm through a first pull rod, the other end of the Z-shaped transmission device is connected with a spherical hinge through a first pull rod, and two side walls of the; a stress sensor is arranged on the first pull rod; and a cross beam for placing a concrete test piece is arranged between the first upright post and the second upright post. The invention can perform the constant axial tension test of the concrete sample by using a simple device and utilizing the lever principle to measure the temperature and humidity change of the concrete sample under the constant tension state.
Description
Technical Field
The invention belongs to the field of concrete temperature and humidity measurement, and particularly relates to a device and a method for measuring the temperature and humidity of concrete under the action of constant axial tension.
Background
The temperature and humidity of concrete are changed drastically due to hydration of cement in the early stage of pouring, the concrete undergoes large temperature deformation and shrinkage deformation in the early stage, the tensile strength of the early stage concrete is low, and once the tensile stress generated by deformation under internal and external constraints exceeds the tensile strength, the concrete cracks, and the service performance such as the durability of a concrete structure is influenced. Therefore, the temperature and humidity change inside the concrete is an important index for predicting early cracking. A large number of tests on concrete temperature and humidity have been conducted at home and abroad, but these tests have been conducted on concrete in a free state. The prior art (a method for measuring the temperature and the humidity of a concrete test piece under the action of constant axial pressure load, patent number ZL 201711053941.1) realizes the measurement of the temperature and the humidity of the concrete under a pressure stress state, but the main reason for causing the cracking of the concrete is tensile stress rather than pressure stress. Therefore, the research on the temperature and humidity change inside the concrete in the tensile stress state can provide important basis for more accurately predicting the early cracking of the concrete.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring the temperature and the humidity of concrete under the action of constant axial tension, aiming at the defects of the background art.
The invention adopts the following technical scheme for solving the technical problems:
a concrete temperature and humidity measuring device under the action of constant axial tension comprises a loading frame, wherein the loading frame comprises a first upright post and a second upright post, the upper end of the first upright post is hinged with a lever, the lever comprises a front arm and a rear arm, the length of the front arm is smaller than that of the rear arm, a Z-shaped transmission device is hinged to the side wall of the first upright post, one end of the Z-shaped transmission device is connected with the end part of the front arm through a first pull rod, the other end of the Z-shaped transmission device is connected with a spherical hinge through a first pull rod, and the two side walls of the upright post are positioned at the; a stress sensor is arranged on the first pull rod; a cross beam for placing a concrete test piece is arranged between the first upright post and the second upright post; the rear arm is positioned right above the second upright post, the end part of the rear arm is connected with a weight hanging rod, and a plurality of counterweight weights are arranged below the weight hanging rod; the temperature and humidity acquisition device is characterized by further comprising a plurality of temperature and humidity probes and a temperature and humidity data acquisition unit connected with the temperature and humidity probes.
Furthermore, an adjusting weight is arranged on the lever in a sliding mode.
Furthermore, bases are arranged at the bottoms of the first upright post and the second upright post.
Further, the upper end of the second upright post is provided with a safety wheel carrier used for limiting the lever.
Furthermore, be provided with the polytetrafluoroethylene board on the crossbeam, all scribble fluid between polytetrafluoroethylene board and the crossbeam, between polytetrafluoroethylene board and the concrete sample.
A method for measuring the temperature and humidity of concrete under the action of constant axial tension by a measuring device comprises the following steps:
manufacturing a concrete test piece and embedding embedded parts at two ends of the concrete test piece along a tension direction;
placing the concrete sample on a polytetrafluoroethylene plate according to a tension direction, and connecting embedded parts at two ends of the concrete sample by using two spherical hinges;
step three, embedding the temperature and humidity probe in the concrete test piece;
placing the counterweight on a weight hanging rod for loading, and controlling the weight of the configured counterweight and adjusting the loading force by observing a stress sensor;
and step five, after loading is finished, disassembling the spherical hinge, putting the concrete sample into a curing room for curing, and continuously monitoring the state of the concrete by a temperature and humidity monitoring system.
Furthermore, in the fourth step, the loading force can be further accurately adjusted by sliding the adjusting weight.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
utilize lever principle, the humiture change of concrete sample under the tensile stress state can be measured to simple device, and in addition, the influence that can reduce the vertical dead weight of concrete is placed to concrete sample level, utilizes the built-in fitting, avoids considering the shape of concrete formula spare.
Drawings
Fig. 1 is a schematic overall structure diagram of the present embodiment.
In the figure, 1, a counterweight; 2. a weight hanging rod; 3. a safety wheel carrier; 4. a lever; 41. a forearm; 42. a rear arm; 5. adjusting the weight; 6. a first pull rod; 7. A stress sensor; 8. spherical hinge; 9. a concrete sample; 10. a temperature and humidity probe; 11. a cross beam; 12. a first upright post; 13. a second upright post; 14. a base; 15. a temperature and humidity data acquisition unit; 16. a Z-shaped transmission device; 171. embedding parts; 18. a polytetrafluoroethylene sheet; 19. hanging feet; 20. and a second pull rod.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
a concrete temperature and humidity measuring device under the action of constant axial tension force is shown in figure 1 and comprises a loading frame, wherein the loading frame comprises a first upright post 12 and a second upright post 13, the upper end of the first upright post 12 is hinged with a lever 4, the lever 4 comprises a front arm 41 and a rear arm 42, the length of the front arm 41 is far smaller than that of the rear arm 42, a Z-shaped transmission device 16 is hinged to the side wall of the first upright post 12, one end of the Z-shaped transmission device 16 is connected with the end part of the front arm 41 through a first pull rod 6, the other end of the Z-shaped transmission device is connected with a spherical hinge 8 through the first pull rod 6, and the side wall of the second upright post 12 is also provided with the spherical; a cross beam 11 for placing a concrete sample is arranged between the first upright post 12 and the second upright post 13; embedded parts 171 extending out of two sides of a concrete test piece placed on the cross beam 11 are respectively connected with a first upright post 12 and a second upright post 13 by utilizing a spherical hinge 8 and a first pull rod 6, wherein a stress sensor 7 is arranged between the Z-shaped transmission device 16 and the spherical hinge 8, and hanging feet 19 are arranged below the first pull rods 6 on two sides of the stress sensor 7; the rear arm 42 is positioned right above the second upright post 13, the end part of the rear arm is connected with a weight hanging rod 2, and a plurality of counterweight weights are arranged below the weight hanging rod 2; the temperature and humidity monitoring system 1 further comprises a plurality of temperature and humidity probes 10 and a temperature and humidity data acquisition unit 15 connected with the temperature and humidity probes 10. And an adjusting weight 5 is arranged on the lever 4 in a sliding manner. The bottoms of the first upright post 12 and the second upright post 13 are provided with bases 14. The upper end of the second upright post 13 is provided with a safety wheel carrier 3 used for limiting the lever 4, the crossbeam 11 is provided with a polytetrafluoroethylene plate 18, and oil is coated between the polytetrafluoroethylene plate 18 and the crossbeam 11 and between the polytetrafluoroethylene plate 18 and the concrete test piece 9.
A method for measuring the temperature and humidity of concrete under the action of constant axial tension by using a measuring device comprises the following steps:
manufacturing a concrete test piece and embedding embedded parts at two ends of the concrete test piece along a tension direction;
placing the concrete sample on a polytetrafluoroethylene plate according to a tension direction, and connecting embedded parts at two ends of the concrete sample by using two spherical hinges;
step three, embedding the temperature and humidity probe in the concrete test piece;
placing the counterweight on a weight hanging rod for loading, and controlling the weight of the configured counterweight and adjusting the loading force by observing a stress sensor; the loading force can be further accurately adjusted by sliding the adjusting weight.
And step five, after loading is finished, disassembling the spherical hinge, putting the concrete sample into a curing room for curing, and continuously monitoring the state of the concrete by a temperature and humidity monitoring system.
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 invention 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 above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention. While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. The utility model provides a concrete temperature and humidity measuring device under invariable axial tension effect which characterized in that: the device comprises a loading frame, wherein the loading frame comprises a first upright post (12) and a second upright post (13), the upper end of the first upright post (12) is hinged with a lever (4), the lever (4) comprises a front arm (41) and a rear arm (42), the length of the front arm (41) is smaller than that of the rear arm (42), a Z-shaped transmission device (16) is hinged to the side wall of the first upright post (12), one end of the Z-shaped transmission device (16) is connected with the end part of the front arm (41) through a first pull rod (6), the other end of the Z-shaped transmission device is connected with a spherical hinge (8) through the first pull rod (6), and the side wall of the second upright post (13) is positioned at the same height of a pulley (16); a stress sensor (7) is arranged on the first pull rod (6); a cross beam (11) for placing the concrete test piece (9) is arranged between the first upright post (12) and the second upright post (13); the rear arm (42) is positioned right above the second upright post (13), the end part of the rear arm is connected with a weight hanging rod (2), and a plurality of counterweight weights (1) are arranged below the weight hanging rod (2); the temperature and humidity monitoring device also comprises a plurality of temperature and humidity probes (10) and a temperature and humidity data acquisition unit (15) connected with the temperature and humidity probes (10).
2. The device for measuring the temperature and humidity of the concrete under the action of the constant axial tension as claimed in claim 1, wherein: and the lever (4) is provided with an adjusting weight (5) in a sliding manner.
3. The device for measuring the temperature and humidity of the concrete under the action of the constant axial tension as claimed in claim 1, wherein: the bottoms of the first upright post (12) and the second upright post (13) are provided with bases (14).
4. The device for measuring the temperature and humidity of the concrete under the action of the constant axial tension as claimed in claim 1, wherein: the upper end of the second upright post (13) is provided with a safety wheel carrier (3) for limiting the lever (4).
5. The device for measuring the temperature and humidity of the concrete under the action of the constant axial tension as claimed in claim 1, wherein: be provided with polytetrafluoroethylene board (18) on crossbeam (11), all scribble fluid between polytetrafluoroethylene board (18) and crossbeam (11), between polytetrafluoroethylene board (18) and concrete test piece (9).
6. A method for measuring the temperature and humidity of concrete under constant axial tension by using the measuring device of claim 1, wherein the method comprises the following steps: the method comprises the following steps:
step one, manufacturing a concrete test piece and embedding embedded parts (171) into two ends of the concrete test piece along a tension direction;
placing the concrete sample on a polytetrafluoroethylene plate (18) according to the tension direction, and connecting embedded parts (171) at two ends of the concrete sample by using two spherical hinges (8);
step three, embedding the temperature and humidity probe (10) in the concrete sample;
placing the counterweight (1) on the weight hanging rod (2) for loading, and controlling the weight of the configured counterweight and adjusting the loading force by observing the stress sensor (7);
and step five, after the loading is finished, disassembling the spherical hinge (8), putting the concrete sample into a curing room for curing, and continuously monitoring the state of the concrete by a temperature and humidity monitoring system.
7. The method for measuring the concrete temperature and humidity under the action of constant axial tension by using the measuring device according to claim 6, wherein the method comprises the following steps: in the fourth step, the loading force can be further accurately adjusted by sliding the adjusting weight (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110291458.7A CN113063671A (en) | 2021-03-18 | 2021-03-18 | Device and method for measuring temperature and humidity of concrete under action of constant axial tension |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110291458.7A CN113063671A (en) | 2021-03-18 | 2021-03-18 | Device and method for measuring temperature and humidity of concrete under action of constant axial tension |
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| CN113063671A true CN113063671A (en) | 2021-07-02 |
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| CN202110291458.7A Pending CN113063671A (en) | 2021-03-18 | 2021-03-18 | Device and method for measuring temperature and humidity of concrete under action of constant axial tension |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608962A (en) * | 2022-05-12 | 2022-06-10 | 四川省公路规划勘察设计研究院有限公司 | Uniaxial compression resistance tester |
-
2021
- 2021-03-18 CN CN202110291458.7A patent/CN113063671A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608962A (en) * | 2022-05-12 | 2022-06-10 | 四川省公路规划勘察设计研究院有限公司 | Uniaxial compression resistance tester |
| CN114608962B (en) * | 2022-05-12 | 2022-08-16 | 四川省公路规划勘察设计研究院有限公司 | Uniaxial compression resistance tester |
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