CN108663272B - Device and method for measuring concrete demolding performance through press bar - Google Patents
Device and method for measuring concrete demolding performance through press bar Download PDFInfo
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- CN108663272B CN108663272B CN201810477112.4A CN201810477112A CN108663272B CN 108663272 B CN108663272 B CN 108663272B CN 201810477112 A CN201810477112 A CN 201810477112A CN 108663272 B CN108663272 B CN 108663272B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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Abstract
A device for measuring the demoulding performance of concrete by a press bar. ExistingThe concrete demolding performance evaluation method has the problems of being inaccurate, complex in operation process steps, time-consuming, labor-consuming, complex in equipment and high in manufacturing cost. The outer sleeve in the concrete mould is clamped on the mounting hole of the base through the convex shoulder, the plug is detachably connected with the upper pressing plate or the lower pressing plate respectively, the lower end of the dowel bar is tightly attached to the top surface of the plug, the upper end of the dowel bar is connected with the lower end of the pressing piece through the pressure sensor, the upper end of the pressing piece is detachably connected to the pressing rod, one end of the pressing rod is hinged on the upright post, and the other end of the pressing rod is a pressing end. In the invention F1+G0For the first adhesion between the lower platen and the concrete, the area of the platen is measured and recorded as S1First bond tensile stress sigma between the lower platen and the concreteTTaking down the lower pressing plate, weighing the lower pressing plate again1，△G＝G1‑G0Namely the adhesion amount of the concrete on the lower pressing plate. The invention is used for measuring the demoulding performance of concrete.
Description
Technical Field
The invention particularly relates to a device and a method for measuring the demoulding performance of concrete by a press bar.
Background
The concrete release agent is a substance which is smeared on a construction template before concrete pouring so as to prevent the template from being stuck on the surface of the concrete after pouring, being difficult to remove the template or influencing the finish degree of the surface of the concrete. The main function of the isolating agent is to form a film on the surface of the template and the concrete to isolate the template and the concrete, so the isolating agent is also called as an isolating agent.
At present, China has established a releasing agent standard JC/T949-2005 for concrete products, the releasing agent quality evaluation index mainly considers homogeneity and construction performance, the homogeneity refers to density, viscosity, PH value, solid content or stability, the construction performance refers to dry film forming time, releasing performance, water resistance, corrosion action on a steel die, limit use temperature or other indexes, the releasing performance is an important index of the releasing agent construction performance, in the releasing agent standard for JC/T949-2005 concrete products, a releasing agent releasing performance test method is provided, a concrete mixing ratio, a die and a maintenance method are specified, the standard suggests selecting a concrete shrinkage test die with a larger area of 100mm × 100mm × 515mm, a test die with a size of 100mm × 100mm × 400mm can also be used, a group of test pieces are formed during detection, after 24 hours, concrete materials adhered to a working surface of a bottom die by a scraper, balance is used after collection, the adhesion amount of a unit area is calculated, the test method also especially considers that the testing force of the test dies is uniform, the adhesion amount is influenced by other bottom die performance indexes, and the adhesion factors on the bottom die are small.
However, the weight of the three test block concretes fluctuates within the range of 28 Kg-38 Kg, manual form removal is needed, and concrete removal is required. The difference between the mold release agents cannot be accurately evaluated by the method of the adhesion amount. The size of the demoulding resistance of the concrete product, the demoulding difficulty and the quality of the concrete after demoulding are determined by the binding power between the concrete and the demoulding agent, and the demoulding performance of the demoulding agent can be more accurately and reliably evaluated by adopting a method for measuring the binding power.
In the article "Evaluation of Performance of Mold-Releasing agent for Polyester Resin in Concrete" by y.ohama et al, japan, it was noted that when polymer Concrete was molded in a semi-cylindrical Mold, adhesion tensile stress and shear stress could not be obtained due to separation of the polymer Concrete from the Mold due to large drying shrinkage, and further, when a steel bar and a steel plate coated with a Mold-Releasing agent were inserted into the polymer Concrete, Evaluation of the Mold-Releasing effect could not be obtained due to drying shrinkage, and finally, the authors indicated that shear stress or adhesion tensile stress could be measured by using an automatic servo universal tester, indicating that the Performance of the Mold-Releasing agent could be evaluated well. The electro-hydraulic servo universal testing machine is expensive and complex to operate, and in addition, for the lower adhesive force between the concrete and the template, the electro-hydraulic servo universal testing machine is used for measuring the adhesive tensile stress and the adhesive shear stress, and the precision of a testing mold and an instrument needs to be redesigned and considered. High cost and complex equipment.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the concrete demolding performance by a press rod, and aims to solve the problems of inaccurate concrete demolding performance evaluation method, time and labor waste in operation, complex equipment and high manufacturing cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a press rod type device for measuring the demoulding performance of concrete comprises a base, a stand column, a press rod, a pressing piece, a pressure sensor, a dowel steel, a screw plug and a concrete mould, wherein the base is horizontally arranged, the stand column is vertically arranged on the base, the lower end of the stand column is fixedly connected with the base, a mounting hole matched with the concrete mould is processed on the base, the concrete mould comprises an outer sleeve, an upper press plate, a lower press plate, an inner sleeve, an upper cover and a lower cover, a convex shoulder matched with the mounting hole is arranged on the outer wall of the outer sleeve, the outer sleeve is clamped on the mounting hole of the base through the convex shoulder, the inner sleeve is positioned in the outer sleeve, the inner sleeve and the outer sleeve are coaxially arranged, concrete is arranged between the outer sleeve and the inner sleeve, the upper press plate and the lower press plate are respectively arranged at two ends of the outer sleeve, the upper end of the outer sleeve is detachably connected with the upper cover, the lower, the lower extreme of dowel steel pastes tightly mutually with the top surface of plug, and the upper end of dowel steel is connected through the lower extreme of pressure sensor with the piece of exerting pressure, and the upper end of the piece of exerting pressure can be dismantled and connect on the depression bar, and the one end of depression bar articulates on the stand, and the other end of depression bar is the application of force end.
As preferred scheme, execute the casting die and include connecting rod and circular arc lid, the one end of connecting rod can be dismantled and connect on the depression bar, and the other end of connecting rod is provided with the circular arc lid, and the arc end of circular arc lid is sunken towards the depression bar.
According to the preferable scheme, a first through hole is processed on the upper pressure plate along the thickness direction of the upper pressure plate, a first internal thread is processed on the inner wall of the first through hole, a second through hole is processed on the lower pressure plate along the thickness direction of the lower pressure plate, a second internal thread is processed on the inner wall of the second through hole, an external thread matched with the first internal thread and the second internal thread is processed on the outer wall of the plug respectively, and when the plug is in threaded connection with the second through hole, the dowel bar presses down the pressure plate through the plug; when the plug is in threaded connection with the first through hole, the dowel bar presses the upper pressure plate through the plug.
As preferred scheme, mounting hole and second through-hole are the shoulder hole, the mounting hole includes first hole and the first hole of going up, first hole and the first coaxial intercommunication setting of going up the hole, the internal diameter in first hole and the first hole of going up reduces from supreme in proper order down, the second through-hole includes hole and the second hole of going up under the second, hole and the second coaxial intercommunication setting of going up the hole under the second, the internal diameter in hole and the second is gone up the hole and is reduced from supreme in proper order down under the second, it has the second internal thread of cooperation plug to process on the inner wall in hole under the second, hole and dowel steel cooperate the setting on the second.
The concrete mold is connected with the lower cover, the inner walls of the upper pressure plate, the lower pressure plate and the outer sleeve are coated with the release agent, and the initial weights of the lower pressure plate and the upper pressure plate are respectively called G0And GNSequentially installing a lower pressing plate and an inner sleeve in an outer sleeve, filling concrete between the outer sleeve and the inner sleeve, vibrating to be compact, installing an upper pressing plate in a concrete mould to press the concrete, respectively pressing the upper pressing plate and the lower pressing plate at two ends of the concrete mould by using an upper cover and a lower cover to ensure that the upper pressing plate and the lower pressing plate are respectively bonded with the concrete in the concrete mould, and curing for at least 24 hours under standard curing conditions;
after maintenance, the upper cover and the lower cover are detached from the outer sleeve, the screw plug is arranged at the second through hole of the lower pressing plate and then placed on the base through the convex shoulder, the lower end of the dowel bar penetrates through the inner sleeve to be attached to the screw plug, a limiting groove for placing a pressure sensor is processed at the upper end of the dowel bar, the force application end of the hand pressing rod vertically applies pressure downwards, the maximum value of the measured reading on the pressure sensor is recorded as F, and the maximum value of the measured reading on the pressure sensor and the weight of the pressure sensor and the dowel bar are F1，F1+G0For the first adhesion between the lower platen and the concrete, the area of the platen is measured and recorded as S1First bond tensile stress sigma between the lower platen and the concreteT，σT＝(F1+G0)/S1(ii) a Taking down the lower pressing plate, weighing the lower pressing plate again1，△G＝G1-G0I.e. the adhesion amount of the concrete on the lower pressing plate, △ G/S is used1The performance of the release agent was evaluated by expressing the amount of adhesion of concrete per unit area;
then, the dowel bar is pulled out, the screw plug is detached from the second through hole, the concrete mold is inverted, the upper pressure plate is positioned in the mounting hole, the screw plug is detachably connected to the first through hole, the dowel bar penetrates through the second through hole and is tightly attached to the upper end of the screw plug, the force application end of the pressure lever is pressed by hand again, pressure is vertically applied downwards, and at the moment, the upper end of the pressure sensor is recordedMeasured maximum value of F, plus the weight of the pressure sensor and the force-transmitting rod2，F2+GNIs the second bonding tensile stress sigma between the upper press plate and the concretetMeasuring and recording the area of the upper platen as S2Second bond tensile stress sigma between the upper platen and the concretet，σt＝(F2+GN)/S2(ii) a The upper platen is taken down and the weight G of the upper platen is weighed again2，△g＝G2-GNThe adhesive amount of the concrete on the upper pressing plate is △ g/S2The performance of the release agent was evaluated by expressing the amount of adhesion of concrete per unit area. A bonding tensile stress sigmaTAnd a second bond tensile stress σtTaking the average value as a test value of the bonding tensile strength sigma of the mould and the concrete, and comparing △ G/S1And △ g/S2The average value was taken as a test value of the concrete adhesion amount per unit area △ G/S.
The invention has the following beneficial effects:
1. according to the invention, the compression rod, the pressing piece, the pressure sensor and the dowel bar are mutually matched, so that the force application structure of the concrete mould is effectively simplified, the force application mode is simple and easy to operate, the steps of the measurement process are effectively simplified, the measurement efficiency is improved, the force application is a single pressure mode, the force application effect is more direct, and the measured and acquired data are more accurate.
2. The invention overcomes the problem of inaccurate demoulding performance caused by factors such as demoulding tools, uneven force application in the operation process and the like in the conventional adhesion quantity measuring method, and has the advantages of simple and reasonable measuring structure, easy operation, accuracy and reliability.
3. The invention has simple structure and direct and reliable operation, and can overcome the problems of expensive equipment, complex test mould and high cost in the existing method for measuring the bonding tensile stress and the bonding shear stress between the mould and the sample by using the electro-hydraulic servo universal testing machine. The cost of the invention is lower than 400 yuan as proved by the sample test of the invention.
4. The invention has simple design, low cost and easy operation, can simultaneously obtain the bonding tensile strength between the concrete mould and the sample and the adhesion amount of the concrete in unit area, can also obtain the data of the bonding tensile strength of the concrete and the adhesion amount of the concrete in unit area through one measuring mould, has comprehensive, accurate, time-saving and labor-saving measuring process, effectively saves the time and energy of measuring personnel, improves the working efficiency of measuring the demoulding performance of the concrete and reduces the difficulty of measuring the demoulding performance of the concrete.
Drawings
FIG. 1 is a schematic cross-sectional view of a front view structure of the present invention;
fig. 2 is a schematic sectional view of the front structure of the base 1;
fig. 3 is a schematic sectional view of the pressing member 4 in a front view;
fig. 4 is a schematic sectional view of a front structure of the concrete mold.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
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 scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
The first embodiment is as follows: the embodiment is described with reference to fig. 1, fig. 2, fig. 3 and fig. 4, and includes a base 1, an upright column 2, a press rod 3, a press member 4, a pressure sensor 5, a dowel bar 6, a plug 13 and a concrete mold, where the base 1 is horizontally disposed, the upright column 2 is vertically disposed on the base 1, and the lower end of the upright column is fixedly connected with the base 1, a mounting hole 9 matched with the concrete mold is processed on the base 1, the concrete mold includes an outer sleeve 8-1, an upper press plate 8-2, a lower press plate 8-3, an inner sleeve 8-4, an upper cover 8-5 and a lower cover 8-6, a shoulder 10 matched with the mounting hole 9 is disposed on the outer wall of the outer sleeve 8-1, the outer sleeve 8-1 is clamped on the mounting hole 9 of the base 1 through the shoulder 10, the inner sleeve 8-4 is disposed inside the outer sleeve 8-1 and coaxially disposed with the outer sleeve, concrete is arranged between the outer sleeve 8-1 and the inner sleeve 8-4, an upper pressure plate 8-2 and a lower pressure plate 8-3 are respectively arranged at two ends of the outer sleeve 8-1, the upper end of the outer sleeve 8-1 is detachably connected with an upper cover 8-5, the lower end of the outer sleeve 8-1 is detachably connected with a lower cover 8-6, a screw plug 13 is respectively detachably connected with the upper pressure plate 8-2 or the lower pressure plate 8-3, the lower end of a dowel bar 6 is tightly attached to the top surface of the screw plug 13, the upper end of the dowel bar 6 is connected with the lower end of a pressing piece 4 through a pressure sensor 5, the upper end of the pressing piece 4 is detachably connected onto a pressing rod 3, one end of the pressing rod 3 is hinged onto the upright post 2, and the other end of the.
In the present embodiment, the cross section of the strut 3 taken along the axial direction of the column 2 is square. The arrangement can ensure that the pressing piece 4 is contacted well, stably and reliably when the upper end of the pressing piece 4 passing through the pressing rod 3 is connected by the nut.
The pressure sensor 5 in this embodiment is a commercially available product, and is a dynamometer, and its operation principle is the same as that in the prior art.
The dowel bar 6 in this embodiment is a rod body made of an existing light-weight high-strength material.
The second embodiment is as follows: the embodiment is further limited by the first embodiment, the pressing member 4 comprises a connecting rod 4-1 and an arc cover 4-2, one end of the connecting rod 4-1 is detachably connected to the pressing rod 3, the other end of the connecting rod 4-1 is provided with the arc cover 4-2, and the arc end of the arc cover 4-2 is bent to be concave towards the pressing rod. The pressing piece 4 is arranged into an arc-shaped screw, so that the pressing piece 4 is always in good contact with the pressure sensor 5 and applies force downwards along the vertical direction in the stress process of the pressure lever 3.
The third concrete implementation mode: the embodiment is further limited by the first or second embodiment, the upper press plate 8-2 is provided with a first through hole 11 along the thickness direction, the inner wall of the first through hole 11 is provided with a first internal thread, the lower press plate 8-3 is provided with a second through hole 12 along the thickness direction, the inner wall of the second through hole 12 is provided with a second internal thread, the outer wall of the plug 13 is provided with an external thread which is matched with the first internal thread and the second internal thread respectively, the plug 13 is detachably connected at the position of the second through hole 12, and when the dowel bar 6 passes through the first through hole 11, the upper end of the plug 13 is tightly attached to the lower end of the dowel bar 6.
The fourth concrete implementation mode: the present embodiment is further limited by the first, second, or third specific embodiment, the mounting hole 9 and the second through hole 12 are both stepped holes, the mounting hole 9 includes a first lower hole 9-1 and a first upper hole 9-2, the first lower hole 9-1 and the first upper hole 9-2 are coaxially communicated, inner diameters of the first lower hole 9-1 and the first upper hole 9-2 are sequentially reduced from bottom to top, the second through hole 12 includes a second lower hole and a second upper hole, the second lower hole and the second upper hole are coaxially communicated, inner diameters of the second lower hole and the second upper hole are sequentially reduced from bottom to top, a second internal thread matching with the plug 13 is processed on an inner wall of the second lower hole, and the second upper hole is matched with the dowel bar 6.
The structure of first through-hole 11 is the same with the structure of second through-hole 12 in this embodiment, and the two symmetry sets up, and the shape setting of second through-hole 12 is favorable to cooperating plug 13 and dowel steel 6 simultaneously, can enough realize effective connection with plug 13, can also pass the passageway for dowel steel 6 provides, and the same reason is in the shape setting of first through-hole 11. In addition, the shape of the mounting hole 9 is set to match the lower cover 8-6 and the concrete mould, so that the relative positions of the two are accurately positioned and the connection is stable. Meanwhile, the shape of the mounting hole 9 is convenient for assembling and disassembling the concrete mould.
The fifth concrete implementation mode: in the present embodiment, first, a concrete mold is connected to a lower cover 8-6, and a release agent is applied to the inner walls of an upper platen 8-2, a lower platen 8-3 and an outer sleeve 8-1, and the initial weights of the lower platen 8-3 and the upper platen 8-2 are respectively designated as G0And GNSequentially installing a lower pressing plate 8-3 and an inner sleeve 8-4 in an outer sleeve 8-1, filling concrete between the outer sleeve 8-1 and the inner sleeve 8-4, vibrating to compact, installing an upper pressing plate 8-2 in a concrete mold to press the concrete, respectively pressing two ends of the concrete mold by using an upper cover 8-5 and a lower cover 8-6 to ensure that the upper pressing plate 8-2 and the lower pressing plate 8-3 are respectively bonded with the concrete in the concrete mold, and curing for at least 24 hours under standard curing conditions;
after maintenance, the upper cover 8-5 and the lower cover 8-6 are detached from the outer sleeve 8-1, the plug 13 is arranged at the second through hole 12 of the lower press plate 8-3 and then placed on the base 1 through the convex shoulder 10, the lower end of the dowel bar 6 penetrates through the inner sleeve 8-4 to be in contact with the plug 13, the upper end of the dowel bar 6 is provided with a limiting groove for placing the pressure sensor 5, the force applying end of the hand pressing bar 3 vertically and downwards applies pressure, the maximum value of the measured reading on the pressure sensor 5 is recorded as F, and the maximum value of the measured reading on the pressure sensor 5 is F after the weights of the pressure sensor 5 and the dowel bar 6 are added1，F1+G0For the first adhesion between the lower press plate 8-3 and the concrete, the area of the press plate 8-3 is measured and recorded as S1First bonding tensile stress sigma between the lower press plate 8-3 and the concreteT，σT＝(F1+G0)/S1(ii) a Taking down the lower pressing plate 8-3, weighing the weight G of the lower pressing plate 8-3 again1，△G＝G1-G0I.e. the adhesion amount of the concrete on the lower pressing plate 8-3, using △ G/S1The performance of the release agent was evaluated by expressing the amount of adhesion of concrete per unit area;
then, the lower end of the dowel bar 6 is separated from the plug 13, the concrete mold is inverted, the upper pressing plate 8-2 is positioned in the mounting hole 9, the plug 13 is detachably connected to the first through hole 11, the dowel bar 6 penetrates through the second through hole 12 and is tightly attached to the upper end of the plug 13, the force application end of the pressure lever 3 is pressed by hand again, pressure is vertically applied downwards, the maximum value of the measured reading on the pressure sensor 5 is recorded as F, and the maximum value of the reading on the pressure sensor 5 and the weight of the dowel bar 6 are recorded as F2，F2+GNIs the second bonding tensile stress sigma between the upper press plate 8-2 and the concretetMeasuring and recording the area of the upper platen 8-2 as S2Second bonding tensile stress sigma between the upper press plate 8-2 and the concretet，σt＝(F2+GN)/S2(ii) a The upper press plate 8-2 is taken down, and the weight G of the upper press plate 8-2 is weighed again2，△g＝G2-GNI.e. the adhesive amount of the concrete on the upper pressing plate 8-2, using △ g/S2The performance of the release agent was evaluated by expressing the amount of adhesion of concrete per unit area. A bonding tensile stress sigmaTAnd a second bond tensile stress σtGet flatThe mean value is used as a mold-concrete bonding tensile strength sigma test value, and △ G/S1And △ g/S2The average value was taken as a test value of the concrete adhesion amount per unit area △ G/S.
The invention refers to the requirement of release agent standard JC/T949-2005 for concrete products, when △ G/S<5g/m2The concrete can be smoothly demoulded, the edges and corners are complete, the surface is smooth, and the requirement is met according to the existing research result, the bonding tensile strength sigma of the mould-concrete is less than or equal to 1.2 × 10-3MPa indicates that the concrete has good demoulding performance.
The first embodiment is as follows: in the concrete mould, an outer sleeve 8-1 is a steel pipe with a convex shoulder 10, the inner diameter is 200mm, the height is 100mm, the outer diameter of an inner sleeve 8-4 is 50mm, the total weight of a pressure sensor 5 and a dowel bar 6 is 0.75Kg, firstly, the concrete mould is connected with a lower cover 8-6, an upper pressure plate 8-2, a lower pressure plate 8-3 and the inner wall of the outer sleeve 8-1 are coated with a release agent, and the initial weights of the lower pressure plate 8-3 and the upper pressure plate 8-2 are respectively called as G01.155kg and GN1.157kg, sequentially installing a lower pressing plate 8-3 and an inner sleeve 8-4 in an outer sleeve 8-1, filling concrete between the outer sleeve 8-1 and the inner sleeve 8-4, vibrating to compact the concrete, installing an upper pressing plate 8-2 in a concrete mold to press the concrete, respectively pressing the upper pressing plate 8-5 and a lower pressing plate 8-6 at two ends of the concrete mold to ensure that the upper pressing plate 8-2 and the lower pressing plate 8-3 are respectively bonded with the concrete in the concrete mold, and curing for at least 24 hours under standard curing conditions;
after maintenance, the upper cover 8-5 and the lower cover 8-6 are detached from the outer sleeve 8-1, the plug 13 is arranged at the second through hole 12 of the lower pressing plate 8-3 and then placed on the base 1 through the shoulder 10, the lower end of the dowel bar 6 penetrates through the inner sleeve 8-4 to be in contact with the plug 13, the upper end of the dowel bar 6 is provided with a limiting groove for placing the pressure sensor 5, the force applying end of the hand pressing rod 3 vertically and downwards applies pressure, the maximum value of the measured reading on the pressure sensor 5 is recorded as F, the maximum value of the F is 15.262N, and the weight of the pressure sensor 5 and the weight of the dowel bar 6 is deducted as F115.262+0.75 × 9.8.8-22.612, the first adhesion force F between the lower press plate 8-3 and the concrete1+G033.931N, the area of the pressure plate 8-3 is measured and recorded as S1＝29437.5mm2First bonding tensile stress sigma between the lower press plate 8-3 and the concreteT，σT＝(F1+G0)/S1＝1.15×10-3MPa; taking down the lower pressing plate 8-3, weighing the weight G of the lower pressing plate 8-3 again1＝1.1551Kg，△G＝G1-G0The concrete adhesion amount on the lower press plate 8-3 is 0.0001Kg, and the concrete adhesion amount per unit area is △ G/S1＝3.4g/m2。
Then, the lower end of the force transmission rod 6 is separated from the plug 13, the concrete mold is inverted, the upper pressing plate 8-2 is positioned in the mounting hole 9, the plug 13 is detachably connected to the first through hole 11, the force transmission rod 6 penetrates through the second through hole 12 and is tightly attached to the upper end of the plug 13, the force application end of the pressure rod 3 is pressed by hand again, the pressure is vertically downwards applied, the maximum value of the measured reading on the pressure sensor 5 is recorded as F-14.421N, and the maximum value of the measured reading on the pressure sensor 5 and the weight of the force transmission rod 6 is recorded as F2＝14.421+0.75×9.8＝21.771N，F2+GN21.771+1.157 × 9.8.8-33.11N is the second bonding tensile stress sigma between the upper platen 8-2 and the concretetMeasuring and recording the area of the upper platen 8-2 as S2＝29437.5mm2Second bonding tensile stress sigma between the upper press plate 8-2 and the concretet，σt＝(F2+GN)/S2＝1.12×10-3MPa; the upper press plate 8-2 is taken down, and the weight G of the upper press plate 8-2 is weighed again2＝1.1570kg，△g＝G2-GNThe concrete adhesion amount per unit area is △ g/S, which is 0, namely the concrete adhesion amount on the upper press plate 8-22The results are shown to evaluate the performance of the release agent.
A bonding tensile stress sigmaTAnd a second bond tensile stress σtTaking the average value as a test value of the bonding tensile strength sigma of the mould-concrete, wherein sigma is ═ sigmaT+σt)/2＝1.135×10-3MPa, △ G/S1And △ g/S2Taking the average value as a test value of the unit area concrete adhesion amount △ G/S, wherein △ G/S is △ G/S1+△g/S2＝3.4/2＝1.75g/m2Since sigma is less than or equal to 1.2 × 10-3MPa，△G/S<5g/m2It was shown that the mold release agent had good mold release properties.
Claims (5)
1. The utility model provides a device of concrete release performance is measured to depression bar formula which characterized in that: the concrete casting die comprises a base (1), a stand column (2), a pressure rod (3), a pressing piece (4), a pressure sensor (5), a dowel bar (6), a screw plug (13) and a concrete die, wherein the base (1) is horizontally arranged, the stand column (2) is vertically arranged on the base (1), the lower end of the stand column is fixedly connected with the base (1), a mounting hole (9) matched with the concrete die is processed on the base (1), the concrete die comprises an outer sleeve (8-1), an upper pressing plate (8-2), a lower pressing plate (8-3), an inner sleeve (8-4), an upper cover (8-5) and a lower cover (8-6), a convex shoulder (10) matched with the mounting hole (9) is arranged on the outer wall of the outer sleeve (8-1), the outer sleeve (8-1) is clamped on the mounting hole (9) of the base (1) through the convex shoulder (10), the inner sleeve (8-4) is positioned inside the outer sleeve (8-1) and coaxially arranged with the outer sleeve (8-1), concrete is arranged between the outer sleeve (8-1) and the inner sleeve (8-4), the upper pressure plate (8-2) and the lower pressure plate (8-3) are respectively arranged at two ends of the outer sleeve (8-1), the upper end of the outer sleeve (8-1) is detachably connected with an upper cover (8-5), the lower end of the outer sleeve (8-1) is detachably connected with a lower cover (8-6), the thread plug (13) is respectively detachably connected with the upper pressure plate (8-2) or the lower pressure plate (8-3), the lower end of the force transmission rod (6) is tightly attached to the top surface of the thread plug (13), the upper end of the force transmission rod (6) is connected with the lower end of the pressing piece (4) through the pressure sensor (5), the detachable upper end of the pressing piece (4) is connected to the pressure rod, one end of the pressure lever (3) is hinged on the upright post (2), and the other end of the pressure lever (3) is a force application end.
2. The apparatus for measuring concrete releasing performance of a press bar type according to claim 1, wherein: the pressing piece (4) comprises a connecting rod (4-1) and an arc cover (4-2), one end of the connecting rod (4-1) is detachably connected to the pressing rod (3), the other end of the connecting rod (4-1) is provided with the arc cover (4-2), and the arc end of the arc cover (4-2) is sunken towards the pressing rod (3).
3. The apparatus for measuring concrete releasing performance of a press bar type according to claim 1 or 2, wherein: a first through hole (11) is processed on the upper pressure plate (8-2) along the thickness direction of the upper pressure plate, a first internal thread is processed on the inner wall of the first through hole (11), a second through hole (12) is processed on the lower pressure plate (8-3) along the thickness direction of the lower pressure plate, a second internal thread is processed on the inner wall of the second through hole (12), external threads matched with the first internal thread and the second internal thread are processed on the outer wall of the plug (13), and when the plug (13) is in threaded connection with the second through hole (12), the pressure plate (8-3) is pressed down by the force transfer rod (6) through the plug (13); when the pipe plug (13) is in threaded connection with the first through hole (11), the dowel bar (6) presses the upper pressure plate (8-2) downwards through the pipe plug (13).
4. The apparatus for measuring concrete releasing performance of a press bar type according to claim 3, wherein: the mounting hole (9) and the second through hole (12) are stepped holes, the mounting hole (9) comprises a first lower hole (9-1) and a first upper hole (9-2), the first lower hole (9-1) and the first upper hole (9-2) are coaxially communicated, the inner diameters of the first lower hole (9-1) and the first upper hole (9-2) are sequentially reduced from bottom to top, the second through hole (12) comprises a second lower hole and a second upper hole, the second lower hole and the second upper hole are coaxially communicated, the inner diameters of the second lower hole and the second upper hole are sequentially reduced from bottom to top, a second internal thread matched with the plug (13) is processed on the inner wall of the second lower hole, and the second upper hole is matched with the force transfer rod (6).
5. The method for measuring the demoulding performance of the concrete by a press bar type is realized by the device of claim 3, and is characterized in that: connecting the concrete mold with a lower cover (8-6), brushing a release agent on the inner walls of the upper pressing plate (8-2), the lower pressing plate (8-3) and the outer sleeve (8-1), and weighing the lower pressing plate (8-3) and the upper pressing plate (8-2) respectively to obtain the initial weight G0And GNSequentially installing a lower pressing plate (8-3) and an inner sleeve (8-4) in an outer sleeve (8-1), filling concrete between the outer sleeve (8-1) and the inner sleeve (8-4), vibrating to compact, installing an upper pressing plate (8-2) in a concrete mold to press the concrete, respectively pressing an upper cover (8-5) and a lower cover (8-6) at two ends of the concrete mold to ensure that the upper pressing plate (8-2) and the lower pressing plate (8-3) are respectively bonded with the concrete in the concrete mold, and curing for at least 24 hours under standard curing conditions;
after maintenance, the upper cover (8-5) and the lower cover (8-6) are detached from the outer sleeve (8-1), a plug (13) is installed at the second through hole (12) of the lower pressing plate (8-3) and then placed on the base (1) through the convex shoulder (10), the lower end of the dowel bar (6) penetrates through the inner sleeve (8-4) to be attached to the plug (13), a limiting groove for placing the pressure sensor (5) is machined in the upper end of the dowel bar (6), the force application end of the hand pressure bar (3) applies pressure vertically downwards, the maximum value of the measured reading on the pressure sensor (5) is recorded as F, and the maximum value of the measured reading on the pressure sensor (5) and the weight of the dowel bar (6) are added as F1，F1+G0For a first adhesion between the lower press plate (8-3) and the concrete, the area of the press plate (8-3) is measured and recorded as S1First bonding tensile stress sigma between the lower press plate (8-3) and the concreteT，σT＝(F1+G0)/S1(ii) a The lower pressing plate (8-3) is taken down, and the weight G of the lower pressing plate (8-3) is weighed again1，△G＝G1-G0I.e. the adhesion amount of the concrete on the lower pressing plate (8-3) is △ G/S1The performance of the release agent was evaluated by expressing the amount of adhesion of concrete per unit area;
then, the dowel bar (6) is pulled out, the plug (13) is detached from the second through hole (12), the concrete mold is inverted, the upper pressing plate (8-2) is positioned in the mounting hole (9), the plug (13) is detachably connected to the first through hole (11), the dowel bar (6) penetrates through the second through hole (12) and is tightly attached to the upper end of the plug (13), the force application end of the pressure lever (3) is pressed by hand again, pressure is vertically applied downwards, the maximum value of the measured reading on the pressure sensor (5) is recorded as F, and the maximum value of the measured reading on the pressure sensor (5) is F after the weights of the pressure sensor (5) and the dowel bar (6) are added2，F2+GNIs the second bonding tensile stress sigma between the upper pressure plate (8-2) and the concretetMeasuring and recording the area of the upper pressure plate (8-2) as S2Second bonding tensile stress sigma between the upper press plate (8-2) and the concretet，σt＝(F2+GN)/S2(ii) a The upper pressing plate (8-2) is taken down, and the weight G of the upper pressing plate (8-2) is weighed again2，△g＝G2-GNNamely the adhering amount of the concrete on the upper pressing plate (8-2) is △ g/S2Representing concrete per unit areaThe adhesion amount was used to evaluate the performance of the release agent; a bonding tensile stress sigmaTAnd a second bond tensile stress σtTaking the average value as a test value of the bonding tensile strength sigma of the mould and the concrete, and comparing △ G/S1And △ g/S2The average value was taken as a test value of the concrete adhesion amount per unit area △ G/S.
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| JPH0890542A (en) * | 1994-09-28 | 1996-04-09 | Alpha Techno Co Ltd | Release agent for form |
| CN2650107Y (en) * | 2003-10-24 | 2004-10-20 | 刘庆兵 | Concrete pilot model |
| CN201460203U (en) * | 2009-08-27 | 2010-05-12 | 中化二建集团有限公司 | Concrete poured slip-form template |
| CN101819135B (en) * | 2010-05-13 | 2012-06-27 | 长沙理工大学 | Method for measuring bond strength between high-intensity glass fiber rib and concrete |
| CN103149094B (en) * | 2013-03-05 | 2015-08-19 | 华北水利水电大学 | The measuring method of tensile creep of early-age concrete |
| KR101532297B1 (en) * | 2013-11-14 | 2015-06-29 | 한국건설기술연구원 | Apparatus and Method for tensile strength test of early age concrete |
| CN105181588A (en) * | 2015-10-21 | 2015-12-23 | 江苏城市职业学院 | Device for determining adhesive property of steel bars and concrete in extruding manner and testing method of device |
| CN205167178U (en) * | 2015-11-03 | 2016-04-20 | 中国水利水电第十二工程局有限公司 | Shedder of test piece |
| CN108037072A (en) * | 2017-12-23 | 2018-05-15 | 中冶建筑研究总院有限公司 | The measurement device and method of a kind of FRP tendons and Bond Performance Between Concrete |
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