CN114112886B - Corrosion-resistant testing arrangement of concrete - Google Patents
Corrosion-resistant testing arrangement of concrete Download PDFInfo
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- CN114112886B CN114112886B CN202111496130.5A CN202111496130A CN114112886B CN 114112886 B CN114112886 B CN 114112886B CN 202111496130 A CN202111496130 A CN 202111496130A CN 114112886 B CN114112886 B CN 114112886B
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- 238000012360 testing method Methods 0.000 title claims abstract description 181
- 230000007797 corrosion Effects 0.000 title claims abstract description 19
- 238000005260 corrosion Methods 0.000 title claims abstract description 19
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 230000003628 erosive effect Effects 0.000 claims abstract description 41
- 238000003825 pressing Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000005192 partition Methods 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 9
- 230000008025 crystallization Effects 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 239000012528 membrane Substances 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 7
- 229910001653 ettringite Inorganic materials 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 238000013178 mathematical model Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- -1 silver ions Chemical class 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Ecology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a concrete erosion resistance testing device which is characterized by comprising a testing box, wherein a testing cavity is formed in the testing box, a concrete test piece is arranged in the testing cavity, a sealing door for taking and placing the concrete test piece is further arranged on a box body on the side wall of the testing cavity, a pressing cavity is arranged in the testing box and is spaced from the testing cavity, a sealed elastic partition is arranged between the pressing cavity and the testing cavity, and an air inlet pipeline is externally connected to the pressing cavity and is provided with an air inlet pump. The invention has the characteristics of simple structure, convenient operation, higher reliability and higher detection precision, and can better realize the detection of the corrosion degree of sulfate on the concrete.
Description
Technical Field
The invention relates to the technical field of corrosion research of concrete structures, in particular to a corrosion resistance testing device for concrete.
Background
Concrete is the most common structural material in constructional engineering, and the durability research of the concrete structure has very important effect and significance for the life prediction. The concrete structure can suffer structural damage and strength reduction caused by sulfate erosion in environments such as seawater, saline-alkali soil, acid rain and the like. Sulfate erosion is also an important erosion mode of erosion damage of a concrete structure, in an environment where sulfate exists, after cracks are generated due to erosion or pressure change of the concrete, the sulfate can invade the inside of the concrete along with the cracks, calcium hydroxide and calcium aluminate hydrate in the cracks and cement react to generate ettringite crystals, the volume of the ettringite crystals can expand to about 100%, the generated ettringite crystals lead to the cracks to be spread, the cracks are further expanded and grow, the sulfate can invade deeper positions, and vicious circulation can rapidly lead to the reduction of the structural strength of the concrete. Therefore, the method for researching the erosion condition of the sulfate on the concrete structure has important significance and value for the field of concrete application research.
In the existing test method for researching corrosion of sulfate on a concrete structure, a concrete test piece is usually placed in a closed cavity of a sulfate environment, and after a period of corrosion, the degree of corrosion of the concrete test piece is judged by means of observation, strength detection and the like. The test piece can not continue to test after intensity detection, so that a plurality of groups of test pieces are needed to be used for comparison, and the cost is high and troublesome. Therefore, if the sulfate erosion depth and the change strength of the erosion strength can be directly obtained, the erosion degree of the concrete test piece can be better judged.
CN201410681700.1 discloses a method for predicting the depth of erosion of concrete sulfate, which comprises: according to the diffusion coefficient of the concrete structure, the sulfate concentration on the surface of the concrete, the initial sulfate concentration in the concrete, the stoichiometric number of chemical reactions and the content of calcium aluminate in the concrete structure, and establishing a sulfate erosion depth multi-parameter mathematical model by combining time parameters and a diffusion coefficient decay index; and acquiring an erosion depth mathematical model of the moment to be predicted according to the first moment, the second moment and the corresponding erosion depth, and acquiring the erosion depth of the moment to be predicted according to the erosion depth mathematical model of the moment to be predicted. According to the method, the corrosion depth can be predicted by the established sulfate corrosion depth prediction model without obtaining specific values of parameters such as the concentration, temperature and corrosion mode of sulfate solution in the environment, the tricalcium aluminate content in cement and the like in practical engineering application, but the method is poor in reliability and practicality due to the fact that the corrosion depth is obtained by purely relying on simulation and theoretical calculation.
CN202110648138.2 discloses a method for detecting the corrosion depth of chloride ions in concrete, which comprises spraying silver nitrate solution on the cross section of concrete, and forming silver chloride precipitate by combining chloride ions and silver ions on the surface of the concrete area containing chloride ions; while free silver ions exist on the surface of the area without chloride ion erosion; and spraying a color development liquid for detecting silver ions, wherein the concrete area containing chloride ions does not display color, and the concrete area not containing chloride ions displays color, and judging the erosion depth of the chloride ions through color difference. The method is convenient, quick and high in universality. However, only a judgment of the approximate depth can be made, and accurate detection of the erosion depth cannot be realized.
CN202110629087.9 discloses an ultrasonic sound velocity detection method and system for detecting concrete performance, which adopts an ultrasonic detection mode to obtain erosion depth, and still has the defects of higher cost and lower practicability.
Therefore, in order to better detect the sulfate erosion depth, the inventor considers that the expansion force of crystallization generated by sulfate reaction at the front end of a crack of a concrete test piece can be converted into forward pressure, and the sulfate erosion depth is obtained by detecting the pressure, so that the detection of the sulfate erosion resistance of a concrete structure can be better realized. However, how to design a device capable of realizing the detection mode, and make the device have a simple structure, convenient operation, and can well regulate and control pressure to accelerate the test rate, which is a problem to be further considered and solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problems that: how to provide a simple structure, conveniently adjust pressure in order to accelerate test rate, can conveniently detect the pressure that the reaction of concrete crack front end sulfate crystallization produced in order to obtain the concrete corrosion resistance testing arrangement of crack erosion degree of depth.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a concrete corrosion resistance testing arrangement, its characterized in that includes a test box, has a test cavity in the test box, be provided with the concrete test piece in the test cavity, still offered the sealing door that is used for getting to put the concrete test piece on the box of test cavity lateral wall, still be provided with a pressure chamber with test cavity interval in the test box, be provided with sealed elasticity and cut off between pressure chamber and the test chamber, external air inlet pipe and install the air inlet pump on the pressure chamber.
Like this, test cavity is used for forming the experimental fluid environment that is rich in sulfate composition, puts into the back with the concrete test piece, can be through the air inlet pump to the cavity that applies pressure air, then through the even and stable pressure in the compression test cavity of elasticity wall for the crack that produces on the concrete test piece can grow fast, realizes the sulfate attack test. Therefore, the test progress can be accelerated more stably, uniformly and rapidly, and the erosion resistance of the concrete test piece can be obtained.
Further, a pressure detection sensor is arranged in the test chamber, the pressure detection sensor is connected with a control device, and the control device is connected with an air inlet pump.
Therefore, the pressure in the test chamber can be detected, the air inlet pump is controlled to feed back, and the stable test pressure in the test chamber is ensured to accelerate the test.
Further, a sulfate solution spraying device is arranged in the testing cavity.
Therefore, a dense fog environment of high-concentration sulfate can be conveniently and rapidly formed in the test chamber, so that corrosion tests can be conveniently carried out.
Further, a sulfate concentration probe is arranged in the testing cavity and connected with a control device, and the control device is connected with a sulfate solution spraying device.
Thus, accurate regulation and maintenance control of the sulfate concentration in the test chamber can be realized through detection feedback control.
Further, test piece supporting tables are arranged in the test cavity at left and right intervals, and a pressing device is arranged above the middle interval position of the test piece supporting tables.
Therefore, after the concrete test piece is placed on the test piece supporting table, the concrete test piece is pressed by the pressing device, so that cracks are generated or the growth of the cracks is accelerated, and the test time is accelerated conveniently.
Further, the concrete test piece is made of concrete to be detected, a plurality of groups of strain gauges are buried in the concrete test piece at different depth positions away from the detection surface of the concrete test piece, and the strain gauges are connected with the concrete test piece through connecting wires buried in the concrete test piece and are connected with the control device.
Thus, the concrete test piece is used for concrete erosion resistance test experiments. When the test device is generally used, cracks are generated on the detection surface of the concrete test piece (the test device can be generated in a loading and load pressing mode), then the concrete test piece is placed in a fluid environment (namely a test cavity) for testing rich in sulfate components, and then the fluid on the periphery of the concrete test piece can be pressed and/or the load can be continuously loaded on the concrete test piece, so that the cracks can be kept to grow. In the process of crack growth, a small reaction solution pool is formed at the forefront end of the crack, so that sulfate reacts with calcium hydroxide and calcium aluminate hydrate mixed in concrete in the reaction solution pool to generate ettringite crystal expansion, and the crack is further expanded and extended inwards, so that the crack is gradually penetrated. Therefore, when the crack grows to the position of the strain gauge, pressure is applied to the strain gauge by the ettringite crystallization expansion, and the depth and time of crack growth can be obtained after the strain gauge senses a pressure signal. Meanwhile, the size of the crack can be judged according to the pressure, so that the erosion resistance of the concrete test piece can be obtained. Therefore, the method has the effect of simply and conveniently obtaining the depth of the crack and the growth time to judge the degree of sulfate erosion.
Further, a connector is provided at the end of the connecting wire connected to the outside of the concrete test piece.
In this way, it is convenient to connect with the control device through the connector.
Further, the strain gage is disposed parallel to the concrete test piece detection surface.
Thus, the forward pressure generated by the expansion of the crystal growth at the front end of the crack can be better detected.
Further, the whole concrete test piece is in a rectangular column shape which is horizontally arranged, four sides in the length direction are detection surfaces, and each group of strain gauges are arranged in the concrete test piece along the cross section to form a rectangular shape with equal proportion.
Therefore, the concrete test piece is conveniently pressed, and the strain gauges are correspondingly arranged on the detection surfaces, so that test detection can be better realized.
Further, the inner side of the strain gauge is fixedly arranged on a supporting frame of a rectangular frame structure of the hard material.
Therefore, the mounting and protection of the strain gauge are conveniently realized, and when the strain gauge is subjected to stress detection, the support frame is convenient for bearing force to enable the strain gauge to be detected.
Further, the supporting frames are coaxial and are provided with a plurality of strain gauges of different sizes at intervals, and each group of strain gauges is respectively mounted on the supporting frames of different sizes.
Thus, detection of different depths is conveniently realized by each group of strain gauges.
Further, the outer surface of the supporting frame is provided with a strain gauge mounting groove, the depth of the strain gauge mounting groove is consistent with the thickness of the strain gauge, and the strain gauge is mounted in the mounting groove.
In this way, the strain gage is more convenient to install and protect. In implementation, the outer surface of the supporting frame is also provided with wiring grooves and used for arranging connecting wires.
Further, the outer surface of the strain gauge is also provided with a layer of reticular framework, and the meshes of the reticular framework are smaller than the size of the minimum aggregate of the concrete test piece.
Therefore, the first net-shaped framework can protect the strain gauge in the production process of the concrete test piece, and avoid being worn out by aggregate and concrete. More importantly, when a test piece is tested, when the front end of a crack reaches the position of a strain gauge, the front end of the crack firstly contacts and acts on the reticular framework, and because the reticular framework is made of hard materials, the expansion force which is generated in the crack generation process and is split towards two sides can be well shielded, the influence of the expansion force on the strain gauge is avoided, so that the strain gauge only bears forward pressure generated by the crystallization expansion of the front end of the crack, and the test detection can be better realized; meanwhile, the front end of the crack is restrained by the reticular framework because of expansion at two sides, so that the forward pressure of crystallization expansion is larger, and the reaction sensitivity of strain gauge detection is improved well.
Further, the net-shaped framework is a steel wire net.
In this way, it is made sufficiently stiff to better achieve the above-mentioned effect.
Further, the net framework is integrally in a rectangular frame structure and sleeved outside the supporting frame.
Thus, the device is convenient to install and fix and improves the protection effect.
Further, the outer surface of the strain gauge is also attached with a layer of isolation film made of elastic materials.
Thus, the isolating film not only can better protect the strain gage from being corroded by concrete in the test piece production process. More importantly, the existence of the isolating membrane enables the front end of the crack to extend to the isolating membrane, and the isolating membrane has elasticity, so that when the crack is expanded, part of expansion force acting on the strain gauge through the reticular framework can act on the isolating membrane and be counteracted by the elasticity of the expansion force; in this way, the influence of the force of the crack expanding to the two sides on the strain gauge is further better avoided, so that the strain gauge only bears forward expansion force to better realize detection. Meanwhile, when the front end of the crack reaches the position of the strain gauge due to the elasticity of the isolating film, the isolating film can be spread for a certain gap, so that the effect of crystallization expansion in the crack can be acted on the strain gauge forwards, and the problem that the strain gauge cannot be stressed due to the fact that the crack cannot be spread completely is avoided. In practice, the isolating film is positioned between the web framework and the strain gauge. As the principle process shows that the isolating film and the netlike framework exist simultaneously, not only can the expansion force of the crack to the two sides be better prevented from acting on the strain gauge, but also the two can exactly compensate the respective defects, and the strain gauge can be better protected and the detection effect can be improved. In the implementation, the periphery of the isolating film is fixed on the supporting frame in a sealing way, and the isolating film and the strain gage can be arranged in a free sliding way. Ensuring that the above-described effects of the separator can be better achieved.
In conclusion, the invention has the characteristics of simple structure, convenient operation, higher reliability and higher detection precision, and can better realize the detection of the corrosion degree of sulfate on concrete.
Drawings
Fig. 1 is a schematic structural view of a concrete erosion resistance test device according to an embodiment of the present invention.
Fig. 2 is a schematic view of the concrete test piece to be tested in fig. 1.
Fig. 3 is a cross-sectional view of fig. 2.
Fig. 4 is an enlarged schematic view of the structure of fig. 3 at the encircled position of the individual strain gauge.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The specific embodiment is as follows:
referring to fig. 1-4, a concrete erosion-resistant testing device is characterized by comprising a testing chamber 6, wherein a testing chamber 7 is arranged in the testing chamber 6, a concrete test piece 1 is arranged in the testing chamber, a sealing door 9 for taking and placing the concrete test piece is further arranged on the box body on the side wall of the testing chamber, a pressing chamber 8 is arranged in the testing chamber and spaced from the testing chamber, a sealed elastic partition 10 is arranged between the pressing chamber and the testing chamber, and an air inlet pipeline 12 is externally connected on the pressing chamber and an air inlet pump 11 is arranged on the pressing chamber.
Like this, test cavity is used for forming the experimental fluid environment that is rich in sulfate composition, puts into the back with the concrete test piece, can be through the air inlet pump to the cavity that applies pressure air, then through the even and stable pressure in the compression test cavity of elasticity wall for the crack that produces on the concrete test piece can grow fast, realizes the sulfate attack test. Therefore, the test progress can be accelerated more stably, uniformly and rapidly, and the erosion resistance of the concrete test piece can be obtained.
The test chamber is also internally provided with a pressure detection sensor 13, the pressure detection sensor 13 is connected with a control device 4, and the control device is connected with an air inlet pump 11.
Therefore, the pressure in the test chamber can be detected, the air inlet pump is controlled to feed back, and the stable test pressure in the test chamber is ensured to accelerate the test.
Wherein the test chamber 7 is also provided with a sulphate solution spraying device 14.
Therefore, a dense fog environment of high-concentration sulfate can be conveniently and rapidly formed in the test chamber, so that corrosion tests can be conveniently carried out. In practice, the sulfate solution spraying device 14 may be externally connected to a sulfate solution spraying pipeline and a spraying pump and connected to a sulfate solution raw material barrel, which is not shown in the figure.
The test chamber is also internally provided with a sulfate concentration probe 15, the sulfate concentration probe is connected with a control device 4, and the control device is connected with a sulfate solution spraying device 14.
Thus, accurate regulation and maintenance control of the sulfate concentration in the test chamber can be realized through detection feedback control.
The test chamber is also internally provided with a test piece supporting table 16 which is arranged at left and right intervals, and a pressing device 17 is also arranged above the middle interval position of the test piece supporting table 16.
Therefore, after the concrete test piece is placed on the test piece supporting table, the concrete test piece is pressed by the pressing device, so that cracks are generated or the growth of the cracks is accelerated, and the test time is accelerated conveniently.
The concrete test piece 1 is made of concrete to be detected, a plurality of groups of strain gauges 2 are buried in the concrete test piece at different depth positions away from the detection surface of the concrete test piece, and the strain gauges 2 are connected with the concrete test piece 1 and the control device 4 through connecting wires 3 buried in the concrete test piece.
Thus, the concrete test piece is used for concrete erosion resistance test experiments. When the test device is generally used, cracks are generated on the detection surface of the concrete test piece (the test device can be generated in a loading and load pressing mode), then the concrete test piece is placed in a fluid environment (namely a test chamber) for testing rich in sulfate components, and then the fluid on the periphery of the concrete test piece can be pressed and/or the load can be continuously loaded on the concrete test piece, so that the cracks can be kept to grow. In the process of crack growth, a small reaction solution pool is formed at the forefront end of the crack, so that sulfate reacts with calcium hydroxide and calcium aluminate hydrate mixed in concrete in the reaction solution pool to generate ettringite crystal expansion, and the crack is further expanded and extended inwards, so that the crack is gradually penetrated. Therefore, when the crack grows to the position of the strain gauge, pressure is applied to the strain gauge by the ettringite crystallization expansion, and the depth and time of crack growth can be obtained after the strain gauge senses a pressure signal. Meanwhile, the size of the crack can be judged according to the pressure, so that the erosion resistance of the concrete test piece can be obtained. Therefore, the method has the effect of simply and conveniently obtaining the depth of the crack and the growth time to judge the degree of sulfate erosion. In practice, the control device is a control device having a computer function, and is specifically a prior art, and is not described in detail herein.
Wherein the end of the connecting wire connected to the outside of the concrete sample 1 is provided with a connecting head 5.
In this way, it is convenient to connect with the control device through the connector.
Wherein the strain gauge 2 is arranged parallel to the detection surface of the concrete test piece 1.
Thus, the forward pressure generated by the expansion of the crystal growth at the front end of the crack can be better detected.
The whole concrete test piece 1 is in a rectangular column shape which is horizontally arranged, four sides in the length direction are detection surfaces, and each group of strain gauges 2 are arranged in the concrete test piece along the cross section to form a rectangular shape with equal proportion.
Therefore, the concrete test piece is conveniently pressed, and the strain gauges are correspondingly arranged on the detection surfaces, so that test detection can be better realized.
Wherein the strain gauge 2 is mounted and fixed on the supporting frame 20 of a rectangular frame structure of hard material on the inner side.
Therefore, the mounting and protection of the strain gauge are conveniently realized, and when the strain gauge is subjected to stress detection, the support frame is convenient for bearing force to enable the strain gauge to be detected.
Wherein, the support frame 20 is coaxial and is provided with a plurality of that is not equi-sized at intervals, and each group strain gauge is installed on the support frame of equi-sized respectively.
Thus, detection of different depths is conveniently realized by each group of strain gauges.
The outer surface of the supporting frame 20 is provided with a strain gauge mounting groove 21, the depth of the strain gauge mounting groove 21 is consistent with the thickness of the strain gauge 2, and the strain gauge 2 is mounted in the mounting groove.
In this way, the strain gage is more convenient to install and protect. In implementation, the outer surface of the supporting frame is also provided with wiring grooves and used for arranging connecting wires.
The outer surface of the strain gauge 2 is also provided with a layer of reticular framework 22, and the mesh of the reticular framework 22 is smaller than the size of the minimum aggregate of the concrete test piece.
Therefore, the first net-shaped framework can protect the strain gauge in the production process of the concrete test piece, and avoid being worn out by aggregate and concrete. More importantly, when a test piece is tested, when the front end of a crack reaches the position of a strain gauge, the front end of the crack firstly contacts and acts on the reticular framework, and because the reticular framework is made of hard materials, the expansion force which is generated in the crack generation process and is split towards two sides can be well shielded, the influence of the expansion force on the strain gauge is avoided, so that the strain gauge only bears forward pressure generated by the crystallization expansion of the front end of the crack, and the test detection can be better realized; meanwhile, the front end of the crack is restrained by the reticular framework because of expansion at two sides, so that the forward pressure of crystallization expansion is larger, and the reaction sensitivity of strain gauge detection is improved well.
Wherein the mesh skeleton 22 is a steel wire mesh.
In this way, it is made sufficiently stiff to better achieve the above-mentioned effect.
The net skeleton 22 is integrally rectangular and is sleeved outside the supporting frame 20.
Thus, the device is convenient to install and fix and improves the protection effect.
Wherein, the outer surface of the strain gauge 2 is also provided with a layer of isolating film 23 made of elastic material.
Thus, the isolating film not only can better protect the strain gage from being corroded by concrete in the test piece production process. What is more, the existence of the isolating membrane enables the front end of the crack 24 to extend to the isolating membrane, and the isolating membrane has elasticity, so that when the crack is expanded, a part of expansion force acting on the strain gauge through the reticular framework can act on the isolating membrane and be counteracted by the elasticity of the expansion force; in this way, the influence of the force of the crack expanding to the two sides on the strain gauge is further better avoided, so that the strain gauge only bears forward expansion force to better realize detection. Meanwhile, when the front end of the crack reaches the position of the strain gauge due to the elasticity of the isolating film, the isolating film can be spread for a certain gap, so that the effect of expansion of the crystals 25 in the crack can be acted on the strain gauge forwards, and the phenomenon that the strain gauge cannot be stressed due to the fact that the crack cannot be spread completely is avoided. In practice, the isolating film is positioned between the web framework and the strain gauge. As the principle process shows that the isolating film and the netlike framework exist simultaneously, not only can the expansion force of the crack to the two sides be better prevented from acting on the strain gauge, but also the two can exactly compensate the respective defects, and the strain gauge can be better protected and the detection effect can be improved. In the implementation, the periphery of the isolating film is fixed on the supporting frame in a sealing way, and the isolating film and the strain gage can be arranged in a free sliding way. Ensuring that the above-described effects of the separator can be better achieved.
Claims (8)
1. The corrosion-resistant testing device for the concrete is characterized by comprising a test box, wherein a testing cavity is formed in the test box, a concrete test piece is arranged in the testing cavity, a sealing door for taking and placing the concrete test piece is further arranged on a box body on the side wall of the testing cavity, a pressing cavity is further arranged in the test box and is spaced from the testing cavity, a sealed elastic partition is arranged between the pressing cavity and the testing cavity, and an air inlet pipeline is externally connected to the pressing cavity and is provided with an air inlet pump;
the concrete test piece is made of concrete to be detected, a plurality of groups of strain gauges are buried in the concrete test piece at different depth positions away from the detection surface of the concrete test piece, and the strain gauges are connected with the concrete test piece through connecting wires buried in the concrete test piece and connected with the control device;
the strain gauge is arranged parallel to the detection surface of the concrete test piece;
the inner side of the strain gauge is fixedly arranged on a supporting frame of a rectangular frame structure made of hard materials;
the support frames are coaxial and are provided with a plurality of strain gauges of different sizes at intervals, and each group of strain gauges are respectively mounted on the support frames of different sizes.
2. The concrete erosion resistance testing device according to claim 1, wherein a pressure detection sensor is further arranged in the testing chamber, the pressure detection sensor is connected with a control device, and the control device is connected with the air inlet pump.
3. The concrete erosion resistance testing device according to claim 1, wherein a sulfate solution spraying device is further arranged in the testing chamber;
and a sulfate concentration probe is further arranged in the test cavity and connected with a control device, and the control device is connected with a sulfate solution spraying device.
4. The concrete erosion resistance testing device according to claim 1, wherein test piece supporting tables are arranged in the testing cavity at left and right intervals, and a pressing device is arranged above the middle interval position of the test piece supporting tables.
5. The concrete erosion resistance test apparatus of claim 1, wherein the end of the connecting wire connected to the outside of the concrete test piece is provided with a connecting head.
6. The concrete erosion resistance testing device according to claim 1, wherein the concrete test piece is in a rectangular column shape which is horizontally arranged as a whole, four sides in the length direction are detection surfaces, and each group of strain gauges is arranged in the concrete test piece along the cross section as a rectangle with equal proportion;
the outer surface of the supporting frame is provided with a strain gauge mounting groove, the depth of the strain gauge mounting groove is consistent with the thickness of the strain gauge, and the strain gauge is mounted in the mounting groove.
7. The concrete erosion resistance testing device according to claim 6, wherein the outer surface of the strain gauge is further provided with a layer of net-shaped framework, and meshes of the net-shaped framework are smaller than the size of the minimum aggregate of the concrete test piece;
the net-shaped framework is a steel wire net;
the net framework is integrally in a rectangular frame structure and sleeved outside the supporting frame.
8. The concrete erosion resistance test apparatus of claim 6, wherein the outer surface of the strain gage is further provided with a layer of an elastomeric barrier film.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410007903.6A CN117664843A (en) | 2021-12-09 | 2021-12-09 | Concrete test piece for corrosion resistance test |
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