CN113063671B - A device and method for measuring temperature and humidity of concrete under constant axial tension - Google Patents
A device and method for measuring temperature and humidity of concrete under constant axial tension Download PDFInfo
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- CN113063671B CN113063671B CN202110291458.7A CN202110291458A CN113063671B CN 113063671 B CN113063671 B CN 113063671B CN 202110291458 A CN202110291458 A CN 202110291458A CN 113063671 B CN113063671 B CN 113063671B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- -1 polytetrafluoroethylene Polymers 0.000 claims description 13
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 13
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 13
- 239000000523 sample Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 210000000245 forearm Anatomy 0.000 claims 1
- 238000005336 cracking Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
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, comprising 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 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, the side wall of the second upright post is positioned at the same height of a pulley and is provided with the spherical hinge through a second pull rod, 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. According to the invention, the lever principle is utilized, the constant axial tension test of the concrete test piece can be performed by using a simple device, and the temperature and humidity change of the concrete test piece under a constant tension state is measured by using the temperature and humidity device.
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 concrete temperature and humidity under the action of constant axial tension.
Background
In early stage of pouring, the concrete can cause severe temperature and humidity change due to cement hydration, the concrete can undergo larger temperature deformation and shrinkage deformation in early stage, the tensile strength of the early-stage concrete is lower, and once the tensile stress generated by deformation under internal and external constraints exceeds the tensile strength, the concrete can crack, so that the service performance of the concrete structure, such as durability, is affected. Therefore, the temperature and humidity change in the concrete is an important index for predicting early cracking. A great deal of experimental study on the temperature and humidity of concrete is carried out at home and abroad, but the experiments are carried out 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 constant axial pressure load, patent number ZL 201711053941.1) realizes the measurement of the temperature and the humidity of the concrete in a compressive stress state, but the most main reason for causing the cracking of the concrete is tensile stress rather than compressive stress. Therefore, the research on the temperature and humidity change in the concrete under the tensile stress state can provide an 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 humidity of concrete under the action of constant axial tension aiming at the defects of the background technology.
The invention adopts the following technical scheme for solving the technical problems:
The 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 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, the side wall of the second upright post is located at the same height of a pulley and is provided with a spherical hinge through a second pull rod, 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 located right above the second upright post, the end part of the rear arm is connected with a weight hanging rod, a plurality of weight weights are arranged below the weight hanging rod, and the temperature and humidity data collector is connected with the temperature and humidity probe.
Further, an adjusting weight is arranged on the lever in a sliding mode.
Further, bases are arranged at the bottoms of the first stand column and the second stand column.
Further, a safety wheel frame for limiting the lever is arranged at the upper end of the second upright post.
Furthermore, the cross beam is provided with a polytetrafluoroethylene plate, and oil liquid is coated between the polytetrafluoroethylene plate and the cross beam and between the polytetrafluoroethylene plate and the concrete test piece.
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:
Firstly, manufacturing a concrete test piece and burying embedded parts at two ends of the concrete test piece along the pulling direction;
placing the concrete test piece on a polytetrafluoroethylene plate according to the pulling direction, and connecting embedded parts at two ends of the concrete test piece by using two spherical hinges;
Embedding the temperature and humidity probe into the concrete test piece;
Step four, placing the counterweight on a counterweight hanging rod for loading, controlling the weight of the configured counterweight through observing a stress sensor, and adjusting loading force;
And fifthly, after loading is completed, the spherical hinge is disassembled, the concrete test piece is placed into a curing room for curing, and the temperature and humidity monitoring system continuously monitors the state of the concrete.
Furthermore, in the fourth step, the loading force can be further accurately adjusted by sliding the adjusting weight.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
the lever principle is utilized, the temperature and humidity change of the concrete test piece in a tensile stress state can be measured by using a simple device, in addition, the influence of the vertical dead weight of concrete can be reduced by horizontally placing the concrete test piece, and the shape of the concrete piece is prevented from being considered by utilizing the embedded part.
Drawings
Fig. 1 is a schematic overall structure of the present embodiment.
In the figure, 1, a counterweight weight, 2, a weight hanging rod, 3, a safety wheel frame, 4, a lever, 41, a front arm, 42, a rear arm, 5, an adjusting weight, 6, a first pull rod, 7, a stress sensor, 8, a spherical hinge, 9, a concrete test piece, 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 device, 16, a Z-shaped transmission device, 171, an embedded part, 18, a polytetrafluoroethylene plate, 19, a hanging leg, 20 and a second pull rod.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings:
the 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 12 and a second upright post 13, a lever 4 is hinged to the upper end of the first upright post 12, 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 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 a first pull rod 6, the side wall of the second upright post 12 is located at the same height of a pulley 16 and is also provided with a spherical hinge 8 through a second pull rod 20, a cross beam 11 for placing a concrete test piece is arranged between the first upright post 12 and the second upright post 13, pre-buried parts 171 extending out from two sides of the concrete test piece placed on the cross beam 11 are respectively connected with the first upright post 12 and the second upright post 13 through the spherical hinge 8 and the first pull rod 6, a stress sensor 7 is arranged between the Z-shaped transmission device 16 and the spherical hinge 8, a foot 19 is arranged below the first pull rod 6 on two sides of the stress sensor 7, the second end of the pull rod 6 is also connected with a plurality of temperature and humidity probes 10 are also connected with a plurality of temperature and humidity probes 10 are arranged below the weight probes. The lever 4 is provided with an adjusting weight 5 in a sliding manner. The bottoms of the first upright 12 and the second upright 13 are provided with a base 14. The upper end of the second upright post 13 is provided with a safety wheel frame 3 for limiting the lever 4, the cross beam 11 is provided with a polytetrafluoroethylene plate 18, and oil is coated between the polytetrafluoroethylene plate 18 and the cross beam 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, comprising the following steps:
Firstly, manufacturing a concrete test piece and burying embedded parts at two ends of the concrete test piece along the pulling direction;
placing the concrete test piece on a polytetrafluoroethylene plate according to the pulling direction, and connecting embedded parts at two ends of the concrete test piece by using two spherical hinges;
Embedding the temperature and humidity probe into the concrete test piece;
And fourthly, placing the counterweight on a counterweight hanging rod for loading, controlling the weight of the configured counterweight through observing a stress sensor, and adjusting the loading force, wherein the loading force can be further accurately adjusted through sliding the adjustable counterweight.
And fifthly, after loading is completed, the spherical hinge is disassembled, the concrete test piece is placed into a curing room for curing, and the temperature and humidity monitoring system continuously monitors the state of the concrete.
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 thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention. The embodiments of the present invention have been described in detail, but 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 (5)
1. The utility model provides a concrete temperature humidity measuring device under invariable axial pulling force effect which characterized in that: comprises a loading frame and a loading device, wherein the loading frame comprises a loading frame, 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 on 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 forearm (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 spherical hinge (8) is arranged on the side wall of the second upright post (13) at the same height of the Z-shaped transmission device (16) through a second pull rod (20); a stress sensor (7) is arranged on the first pull rod (6); a cross beam (11) for placing a 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 weight hanging rod 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 data acquisition device also comprises a plurality of temperature and humidity probes (10) and a temperature and humidity data acquisition device (15) connected with the temperature and humidity probes (10);
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 a base (14).
2. The device for measuring the temperature and the humidity of the concrete under the action of constant axial tension according to claim 1 is characterized in that a safety wheel frame (3) for limiting the lever (4) is arranged at the upper end of the second upright post (13).
3. The device for measuring the temperature and the humidity of the concrete under the action of the constant axial tension according to claim 1 is characterized in that a polytetrafluoroethylene plate (18) is arranged on the cross beam (11), and oil is coated between the polytetrafluoroethylene plate (18) and the cross beam (11) and between the polytetrafluoroethylene plate (18) and a concrete test piece (9).
4. A method for measuring the temperature and humidity of concrete under constant axial tension by using the measuring device as claimed in claim 1, which is characterized by comprising the following steps:
firstly, manufacturing a concrete test piece and burying embedded parts (171) at two ends of the concrete test piece along the pulling direction;
Placing a concrete test piece on a polytetrafluoroethylene plate (18) according to a pulling direction, and connecting embedded parts (171) at two ends of the concrete test piece by using two spherical hinges (8);
Embedding a temperature and humidity probe (10) in the concrete test piece;
Step four, placing the counterweight (1) on a counterweight hanging rod (2) for loading, controlling the weight of the configured counterweight through observing a stress sensor (7), and adjusting loading force;
and fifthly, after loading is completed, the spherical hinge (8) is disassembled, the concrete test piece is placed into a curing room for curing, and the temperature and humidity monitoring system continuously monitors the state of the concrete.
5. The method for measuring the temperature and humidity of concrete under the action of constant axial tension by using the measuring device according to claim 4, 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110291458.7A CN113063671B (en) | 2021-03-18 | 2021-03-18 | A device and method for measuring temperature and humidity of concrete under constant axial tension |
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| CN202110291458.7A CN113063671B (en) | 2021-03-18 | 2021-03-18 | A device and method for measuring temperature and humidity of concrete under constant axial tension |
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| CN113063671B true CN113063671B (en) | 2024-12-13 |
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| CN114965039A (en) * | 2022-04-25 | 2022-08-30 | 大连理工大学 | Ice mechanical property experimental device |
| 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 Tester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN215727378U (en) * | 2021-03-18 | 2022-02-01 | 河海大学 | Concrete temperature and humidity measuring device under constant axial tension effect |
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| CN101726439B (en) * | 2009-12-18 | 2012-01-04 | 东南大学 | Method for testing concrete performance under pressure stress-chemical coupling effect and device thereof |
| CN106596297B (en) * | 2017-03-05 | 2020-10-16 | 南京大学 | A kind of test equipment and method for mechanical behavior characteristics of energy pile-soil interface |
| RU2720396C1 (en) * | 2019-01-30 | 2020-04-29 | Василий Глебович Сазонов | Method of investigating features of deformation of rubber-like materials with temperature change |
| CN110376061A (en) * | 2019-07-15 | 2019-10-25 | 东南大学 | A kind of double lever tensile creep device and its test method that load is continuously adjustable |
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| CN215727378U (en) * | 2021-03-18 | 2022-02-01 | 河海大学 | Concrete temperature and humidity measuring device under constant axial tension effect |
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