CN113155663A - Porous material pressure-water absorption coupling testing device for laboratory and testing method thereof - Google Patents
Porous material pressure-water absorption coupling testing device for laboratory and testing method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 187
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 103
- 239000011148 porous material Substances 0.000 title claims abstract description 41
- 230000008878 coupling Effects 0.000 title claims abstract description 24
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
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- 238000010998 test method Methods 0.000 abstract description 2
- 238000005303 weighing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- RSMUVYRMZCOLBH-UHFFFAOYSA-N metsulfuron methyl Chemical compound COC(=O)C1=CC=CC=C1S(=O)(=O)NC(=O)NC1=NC(C)=NC(OC)=N1 RSMUVYRMZCOLBH-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention provides a pressure-water absorption coupling test device for porous materials for laboratories and a test method thereof. The invention solves the technical problems of the existing water absorption test devices for two porous materials, can perform water absorption test under a pressed condition, improves the precision of the water absorption test result of the porous material under a low-pressure stress level, reduces the damage and the influence caused by the drill core of a test piece, and improves the test precision.
Description
Technical Field
The invention relates to a porous material pressure-water absorption coupling test device for a laboratory and a test method thereof, belonging to the technical field of test devices for testing the water absorption capacity of materials.
Background
The existing water absorption test devices for porous materials are mainly divided into two types. One is as follows: the natural water absorption device without original pressure action or removing load after being pressed comprises the following two parts: a water penetration device under compression (as shown in figure 1).
However, the first device can only test the water absorption of the porous material when the force value is removed after the pressure is applied (i.e., the non-pressure state in the water absorption test). Porous materials, especially building porous materials such as mortar, concrete and the like are mostly in a stressed state in daily use. The pore structure of the porous material is changed under the compression state, and the occurrence and development of micro-cracks under different compression stress levels can influence the water absorption capacity of the porous material. When the pressure is removed, the elastically deformed pores recover and the change in water absorption capacity can only be measured when the pores undergo plastic irreversible deformation. Most porous materials deform elastically at low stress levels. Thus, the first device has a problem in determining the water uptake of porous materials at low stress levels.
The second device shown in fig. 1 can measure the amount of water seeping in a state of being loaded, but has two problems: 1. the test specimen needs to be sampled by a drill core, the drill core can generate cracks on the test specimen used for testing, the accuracy of the test result is affected, the size of the test specimen and the thickness of the drill core are matched with corresponding drill core instruments, and the test cost and the complexity of operation are increased. 2. The method has high requirements on the test piece, the test piece is required to be in a thin-wall cylindrical shape, water cannot permeate through the wall thickness to influence the collection of water seepage if the cylindrical wall is too thick or the material of the test piece is too dense, and the test cannot be carried out if the test piece is not in a cylindrical shape.
Disclosure of Invention
The invention provides a porous material pressure-water absorption coupling testing device for a laboratory and a testing method thereof, aiming at solving the technical problems of the existing water absorption testing devices of two porous materials in the background technology.
The invention provides a porous material pressure-water absorption coupling test device for a laboratory, which comprises a press part, a communication water absorption test part and a data acquisition part,
the press part comprises a press lower bottom plate A, a press lower bottom plate B and a press upper plate, the top surface of the press lower bottom plate A is higher than the top surface of the press lower bottom plate B,
the communicated water absorption testing part comprises a test piece water absorption container, a water storage container, a liftable electronic scale base, a communicating pipe and an electronic scale which can be connected with a computer, records data in real time and is accurate to +/-0.01 g, the test piece water absorption container is placed on a lower base plate A of the press machine and is positioned below an upper plate of the press machine, a test piece pressing base plate is placed above the test piece in the container so as to ensure the smooth proceeding of a pressing process, the water storage container is placed on the electronic scale, the electronic scale is placed on the liftable electronic scale base, the liftable electronic scale base is positioned on a lower base plate B of the press machine, the water absorption container is communicated with the water storage container through the communicating pipe,
the data acquisition part comprises a computer, the computer is communicated with the press machine and the electronic scale, and the load and the displacement applied by the press machine and the reading of the electronic scale are output to the computer.
Preferably, the test piece container that absorbs water includes transparent visual scale mark A, filter screen and allies oneself with through-hole A, be carved with transparent visual scale mark A on the ladle body of test piece container that absorbs water, open ladle body lateral wall bottom has allied oneself with through-hole A, it is provided with the filter screen to allie oneself with through-hole A inboard.
Preferably, the water storage container comprises a cover, an air vent, transparent visual scale marks B and a connecting through hole B, the cover is arranged above the barrel body of the water storage container, the air vent is arranged on the cover, the transparent visual scale marks B are carved on the barrel body, and the connecting through hole B is formed in the bottom of the side wall of the barrel body.
Preferably, the two ends of the communicating pipe are connected with stainless steel joints, and the two ends of each stainless steel joint are respectively connected with the communicating holes of the water absorption container and the water storage container of the test piece. The part of the communicating pipe close to the container is provided with a water valve.
Preferably, a communicating pipe supporting device is installed below the communicating pipe.
Preferably, the communicating pipe supporting device comprises a bracket, a plurality of lighting devices, a bolt for adjusting the direction of the bracket, a bolt for controlling lifting and a sucker type base, the bracket is provided with the lighting devices, a supporting rod is arranged under the bracket, the joint of the supporting rod and the bracket is provided with the bolt for adjusting the direction of the bracket, the bottom of the supporting rod is provided with the sucker type base, and the supporting rod is provided with the bolt for controlling lifting.
Preferably, the press machine lower base plate A and the press machine lower base plate B are connected through bolts, and the press machine lower base plate B can be detached during non-pressure water absorption testing.
Preferably, the upper surface of the electronic scale is made of a material with a rough surface, so that the water storage container is prevented from sliding in the test process.
A testing method of the porous material pressure-water absorption coupling testing device for the laboratory specifically comprises the following steps:
(1) before the test, the lower bottom plate A of the press machine is connected with the lower bottom plate B of the press machine,
(2) cleaning each base to ensure that the base is smooth and clean,
(3) placing the test piece according to the icon in the water absorption container of the test piece, placing the test piece pressing base plate on the top of the test piece,
(4) opening the data acquisition system and the pressure test system of the computer, filling water into the water storage container,
(5) descending the upper plate of the press machine, lifting a liftable electronic scale base of the electronic scale, when a communicating hole B of a water storage container is higher than a communicating hole A of a water absorption container and lower than one-half of the height of the water absorption container, unscrewing a water valve on a communicating pipe, closely paying attention to the change of the water level in the water absorption container of the test piece through a transparent visible scale mark A, when the communicating hole B is close to a target value, reducing the liftable electronic scale base to ensure that the communicating hole B of the water storage container and the communicating hole A of the water absorption container keep the same height as much as possible, paying attention to the water level line in the water absorption container and the water storage container of the test piece, and preventing the test piece from overflowing due to excessive water in the water absorption container,
(6) and erecting a communicating pipe supporting device, opening a lighting device, observing whether bubbles exist in the communicating pipe or not, and starting a test if no bubbles exist.
The porous material pressure-water absorption coupling testing device for the laboratory and the testing method thereof have the beneficial effects that:
1. the porous material pressure-water absorption coupling test device for the laboratory can be used for performing water absorption test under a pressure condition, and the precision of a water absorption test result of the porous material under a low-pressure stress level is improved.
2. The porous material pressure-water absorption coupling testing device for the laboratory reduces damage and influence caused by the drill core of the test piece, and improves the testing precision.
3. The porous material pressure-water absorption coupling test device for the laboratory has no requirements on the shape and the thickness of a test piece, reduces the test complexity, reduces the test cost, and can be used for carrying out a pressure water absorption test on various test pieces.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic structural diagram of a second apparatus described in the background art;
FIG. 2 is a schematic structural diagram of a pressure-water absorption coupling testing device for porous materials used in laboratories according to the present invention;
FIG. 3 is a schematic diagram of the press and data collector portions;
FIG. 4 is an enlarged view of a portion of a press bed A and a press bed B;
FIG. 5 is a schematic structural view of a water absorption container of a test piece;
FIG. 6 is a schematic structural view of the water storage container;
FIG. 7 is a schematic structural diagram of the communicating pipe;
FIG. 8 is a schematic structural view of the communicating pipe supporting device;
the test bed comprises a press machine lower base plate A (for bearing a test piece), a press machine lower base plate B (for bearing an electronic scale), a test piece water absorption container 3, a water storage container 4, a press machine upper plate 5, a liftable electronic scale base 6, a test piece pressure bearing base plate 7, an electronic scale 8, a communication pipe 9, a communication pipe support device 10, a transparent visual scale mark A11, a filter screen 12, a communication hole A13, a communication hole cover 14, an air vent 15, a transparent visual scale mark B16, a communication hole B17, a stainless steel joint 18, a bracket 19, an illuminating device 20, a bolt 21 for adjusting the direction of the bracket, a bolt 22 for controlling the lifting and a sucker type base 23.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: this embodiment is explained with reference to fig. 2 to 8. The pressure-water absorption coupling test device for the porous material for the laboratory comprises a press part, a communication water absorption test part and a data acquisition part,
the press part comprises a press lower bottom plate A1, a press lower bottom plate B2 and a press upper plate 5, the top surface of the press lower bottom plate A1 is higher than the top surface of the press lower bottom plate B2, and other structures of the press part are the existing press structures.
The communicated water absorption testing part comprises a test piece water absorption container 3, a water storage container 4, a communicating pipe 9 and an electronic scale 8 which can be connected with a computer, records data in real time and is accurate to 0.01g, the test piece water absorption container 3 is placed on a lower base plate A1 of the press machine and is positioned below an upper plate 5 of the press machine, a test piece pressure bearing base plate is padded on the test piece water absorption container 3, the water storage container 4 is placed on the electronic scale 8, the electronic scale 8 is placed on a liftable electronic scale base 6, the liftable electronic scale base 6 is positioned on a lower base plate B2 of the press machine, the water absorption container 3 is communicated with the water storage container 4 through the communicating pipe 9,
the data acquisition part comprises a computer and corresponding operation software of equipment such as the press machine, the electronic scale and the like, the computer is communicated with the press machine and the electronic scale 8, and the load and the displacement applied by the press machine and the reading of the electronic scale 8 are output to the computer.
The test piece water absorption container 3 comprises transparent visual scale marks A11, a filter screen 12 and a communicating hole A13, the transparent visual scale marks A11 are carved on the barrel body of the test piece water absorption container 3, the communicating hole A13 is formed in the bottom of the side wall of the barrel body, and the filter screen 12 is arranged at the communicating hole A13.
The water storage container 4 comprises a cover 14, a vent hole 15, a transparent visible scale mark B16 and a communicating hole B17, the cover 14 is arranged above the barrel body of the water storage container 4, the vent hole 15 is formed in the cover, the transparent visible scale mark B16 is carved on the barrel body, and the communicating hole B17 is formed in the bottom of the side wall of the barrel body.
The two ends of the communicating pipe 9 are connected with stainless steel joints 18, and the two ends of the stainless steel joints 18 are respectively connected with communicating holes of the test piece water absorption container 3 and the water storage container 4. The part of the communicating pipe 9 close to the container 4 is provided with a water valve.
And a communicating pipe supporting device 10 is arranged below the communicating pipe 9. The communicating pipe supporting device 10 comprises a bracket 19, a plurality of lighting devices 20, a bolt 21 for adjusting the bracket direction, a bolt 22 for controlling lifting and a suction cup type base 23, wherein the bracket 19 is provided with the lighting devices 20, a supporting rod is arranged below the bracket 19, the joint of the supporting rod and the bracket 19 is provided with the bolt 21 for adjusting the bracket direction, the bottom of the supporting rod is provided with the suction cup type base 23, and the supporting rod is provided with the bolt 22 for controlling lifting.
The dimension of the test piece pressed base plate 7 in the length and width directions is smaller than the corresponding dimension of the container 3 and larger than the dimension of the test piece pressed surface, so that errors are avoided when the test piece is pressed. The size in the height direction is ensured to have enough rigidity according to the estimated breaking pressure of the test piece.
Regarding how the test piece and its upper backing plate are placed: the maximum distance between the upper pressure plate and the lower pressure plate of the press is more than 3 times of the height of the test piece. After the container 3 is placed, the upper pressure plate is lifted to enable the distance between the upper pressure plate and the upper opening of the container 3 to be larger than the height of the test piece, and the test piece is placed according to the test piece placing position icon drawn in advance on the bottom in the container 3. And then the base plate of the test piece is placed above the test piece. And finally, lowering the pressure plate on the press to keep the pressure plate and the top surface of the backing plate above the test piece at a distance of about 1mm before the test.
In order to test the water absorption of the test piece in a pressed state, the invention designs a device adopting the principle of a communicating vessel (as shown in figure 2). The device is divided into three parts, which are respectively: and the press part is communicated with the water absorption testing part and the data acquisition part.
A press part: the traditional press test piece base is reformed, and one side of the base is designed into a step shape and is divided into a press lower bottom plate A1 and a press lower bottom plate B2. The part A1 of the lower bottom plate of the press machine is mainly used for placing a test piece, and the part B2 of the lower bottom plate of the press machine is mainly used for placing a weighing instrument. The height difference h0 of the step between the press lower bottom plate A1 and the press lower bottom plate B2 is determined according to the height of the electronic weighing tool, and the construction requirements are as follows: so that the top of the electronic weighing device is not lower than the horizontal plane of the base of the test piece. Because the part B2 of the lower bottom plate of the press is not stressed, the rigidity of the lower bottom plate of the press does not need to be strengthened intentionally during construction, and the part A1 of the lower bottom plate of the press considers the rigidity requirement according to the maximum bearing capacity of the press and the size of a test piece. The press lower base plate A1 and the press lower base plate B2 are connected through bolts, and the part of the press lower base plate B2 (shown in figure 4) can be removed in a non-pressure water absorption test.
Communicating vessel water absorption test part: the part is divided into a group of communicating containers, a weighing apparatus and a bearing device. The bottom of the communicating container needs to be made of steel with the same thickness, and the thickness of the steel is not too thin so as to ensure that enough rigidity is provided when the test piece is pressed. The communicating holes are arranged at the positions, close to the bottoms of the two barrels, of the two barrels and need to be arranged as the outer convex openings, and the outer contours are threads, so that the communicating pipes 9 can be replaced conveniently when damaged.
The intercommunicating pores are communicated by using soft waterproof hollow materials such as stainless steel at two ends, screw threads on the outer sides and rubber tubes in the middle, namely the intercommunicating tubes 9. The pipe cannot be made of materials with too dark colors (such as black, dark brown and the like) and the diameter of the middle hollow part is larger than 3mm, so that the normal circulation of water in the test process is ensured not to be blocked. The connection between the pipe and the container must be strictly water-tight.
The height of the water absorption container of the test piece is slightly higher than that of the test piece, and the water absorption container is provided with a thicker test piece top base plate with the same size as the bottom surface of the standard test piece, so that the container is prevented from being damaged by contact and pressure of an upper pressure plate of a press machine or the stress of the test piece is prevented from being influenced in the test process. In addition, the test piece water absorption container 3 is respectively provided with transparent scale strips in the direction vertical to the communicating pipe 9, and the 0 point position of the scale strips is the upper top surface of the bottom of the test piece water absorption container 3 so as to ensure that the water quantity is controlled during initial water adding. Inside the test piece water absorption container 3, a filter screen 12 is arranged around the intercommunicating pore, the side length (or diameter) of the mesh is more than 1mm and less than 3mm, so as to avoid the blockage caused by small fragments entering the communicating pipe when the test piece is broken. The water reservoir 4 should be equipped with a removable lid 14, with the lid 14 requiring an opening. The cover 14 is arranged to avoid the error caused by the evaporation of water in the water storage container 4 when the temperature in the test chamber is too high and the test time is too long as possible, and the hole is formed to communicate the water storage container 4 with the atmosphere so as to ensure the normal use of the communicating vessel (as shown in fig. 6).
The weighing apparatus comprises an electronic scale 8 which can be connected with a computer to record data in real time and is accurate to 0.01g, and the upper surface of the electronic scale 8 adopts a material with a rough surface to prevent the water storage container 4 from sliding in the test process.
The bearing device is divided into two parts: a liftable electronic scale base 6 and a height-adjustable communicating pipe supporting device 10 with a lighting device. When water is injected into the test piece water absorption container 3 through the water storage container 4 before the test piece water absorption container 3 is filled with water to a half, the electronic scale 8 and the water storage container 4 on the electronic scale base 6 which can be lifted need to be lifted so as to ensure that air in the communicating pipe is smoothly discharged, and the water transmission is facilitated, and then the base is lowered to a proper position. The middle vent tube 9 needs to be supported all the way through the test to prevent the hose from dropping and blocking moisture transmission. The lighting device 20 can then detect the presence of air bubbles in the hose during the test, which can lead to a blockage of moisture transmission (see fig. 8).
The lifting mechanism of the liftable electronic scale base 6 is that a nut and a screw are arranged in the bottom of the base, and an upper iron plate is jacked up by rotating the screw.
The data acquisition part is mainly a computer capable of controlling the operation of the press and the electronic scale 8, and the requirement is that the load and the displacement applied by the press and the reading of the electronic scale can be simultaneously output.
The testing method of the porous material pressure-water absorption coupling testing device for the laboratory comprises the following steps:
press shoe a1 was attached to press shoe B2 prior to testing. Cleaning each base to ensure that the base is smooth and clean. After the test piece is placed according to the icon in the test piece water absorption container 3, the test piece compression base plate 7 at the top of the test piece is placed. And opening a data acquisition system and a pressure test system of the computer. Water is filled into the water storage container 4. The top plate of the press machine is lowered, the base of the electronic scale is lifted, when the two communicating ports have height difference (the water storage container 4 is higher than the test piece water absorption container 3), the water valve of the water storage container 4 is unscrewed, the change of the water level in the test piece water absorption container 3 is closely concerned through the transparent scale bar, and when the target value is approximate, the base of the platform scale is lowered, the water level line between the test piece water absorption container 3 and the water storage container 4 is noticed, so that the excessive water in the test piece water absorption container 3 is prevented from overflowing. And erecting a bracket communicated with the hose, turning on the lighting equipment, and observing whether bubbles exist in the hose. No bubbles can start the test. And closing the pressure testing system and the data acquisition system after the test is finished.
The icon is an indicating line drawn at the bottom of the container 3 according to the size of the test piece, and is used for ensuring that the test piece has a certain distance from the edge of the container 3 and avoiding affecting water absorption in the compression process.
The working principle of the porous material pressure-water absorption coupling testing device for the laboratory is as follows:
by utilizing the principle of the communicating vessel, the water absorption container 3 and the water storage container 4 of the communicated test piece keep the same water surface height. When the liquid level of the test piece in the water absorption container 3 drops due to the fact that the test piece absorbs water mg, water in the water storage container 4 enters the water absorption container 3 of the test piece through the communicating pipe 9 due to communication, and the water content in the water absorption container 3 of the test piece is supplied. Supply mass m0And m is in a linear relationship (as shown in formula 1). Therefore, the water absorption capacity of the test piece in the test piece water absorption container 3 can be calculated according to the mass reduction in the water storage container 4, and the specific formula 1 is as follows:
m0: the quality of the supply after each test piece absorbs water; m: the water absorption quality of the test piece; a. theD: the bottom area of the water storage container 4; a. theC: the bottom area of the specimen water absorption container 3; a. theS: bottom surface of standard test pieceAnd (4) accumulating.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A porous material pressure-water absorption coupling test device for a laboratory is characterized by comprising a press part, a communication water absorption test part and a data acquisition part,
the press part comprises a press lower bottom plate A (1), a press lower bottom plate B (2) and a press upper plate (5), the top surface of the press lower bottom plate A (1) is higher than the top surface of the press lower bottom plate B (2),
the communication water absorption testing part comprises a test piece water absorption container (3), a water storage container (4), a liftable electronic scale base (6), a communicating pipe (9) and an electronic scale (8) which can be connected with a computer, records data in real time and is accurate to 0.01g, the test piece water absorption container (3) is placed on a lower base plate A (1) of the press machine and is positioned below an upper plate (5) of the press machine, a test piece compression base plate (7) is padded above the test piece in the test piece water absorption container (3), the water storage container (4) is placed on the electronic scale (8), the electronic scale (8) is placed on the liftable electronic scale base (6), the liftable electronic scale base (6) is positioned on a lower base plate B (2) of the press machine, the test piece water absorption container (3) is communicated with the water storage container (4) through the communicating pipe (9),
the data acquisition part comprises a computer, the computer is communicated with the press machine and the electronic scale (8), and the load and the displacement applied by the press machine and the reading of the electronic scale (8) are output to the computer.
2. The porous material pressure-water absorption coupling test device for the laboratory according to claim 1, wherein the test piece water absorption container (3) comprises a transparent visual scale mark A (11), a filter screen (12) and a communicating hole A (13), the transparent visual scale mark A (11) is carved on the barrel body of the test piece water absorption container (3), the communicating hole A (13) is formed in the bottom of the side wall of the barrel body, and the filter screen (12) is arranged on the inner side of the communicating hole A (13).
3. The laboratory porous material pressure-water absorption coupling test device according to claim 1, wherein the water storage container (4) comprises a cover (14), a vent hole (15), a transparent visible scale mark B (16) and a communicating hole B (17), the cover (14) is arranged above the barrel body of the water storage container (4), the vent hole (15) is arranged on the cover, the transparent visible scale mark B (16) is carved on the barrel body, and the communicating hole B (17) is formed in the bottom of the side wall of the barrel body.
4. The porous material pressure-water absorption coupling test device for the laboratory according to claim 1, wherein both ends of the communicating pipe (9) are connected with stainless steel joints (18), and both ends of the stainless steel joints (18) are respectively connected with communicating holes of the water absorption container (3) and the water storage container (4) of the test piece.
5. The porous material pressure-water absorption coupling test device for the laboratory according to claim 1, wherein a communicating pipe support device (10) is installed below the communicating pipe (9).
6. The porous material pressure-water absorption coupling test device for the laboratory according to claim 5, wherein the communicating pipe support device (10) comprises a bracket (19), a plurality of lighting devices (20), a bolt (21) for adjusting the direction of the bracket, a bolt (22) for controlling lifting and a suction cup type base (23), the plurality of lighting devices (20) are arranged on the bracket (19), a support rod is arranged under the bracket (19), the bolt (21) for adjusting the direction of the bracket is arranged at the joint of the support rod and the bracket (19), the suction cup type base (23) is arranged at the bottom of the support rod, and the bolt (22) for controlling lifting is arranged on the support rod.
7. The porous material pressure-water absorption coupling test device for the laboratory according to claim 1, wherein the press lower base plate A (1) and the press lower base plate B (2) are connected through bolts, and the press lower base plate B (2) can be detached during a non-pressure water absorption test.
8. The laboratory porous material pressure-water absorption coupling test device according to claim 1, wherein the upper surface of the electronic scale (8) is made of a material with a rough surface, so that the water storage container (4) is prevented from sliding in the test process.
9. The testing method of the laboratory porous material pressure-water absorption coupling testing device according to any one of claims 1 to 8, which comprises the following steps:
(1) before the test, a lower bottom plate A (1) of the press machine is connected with a lower bottom plate B (2) of the press machine,
(2) cleaning each base to ensure that the base is smooth and clean,
(3) a test piece is placed according to the icon in the test piece water absorption container (3), a test piece pressure bearing base plate (7) at the top of the test piece is placed,
(4) the data acquisition system and the pressure test system of the computer are opened, water is filled into the water storage container (4),
(5) descending a press upper plate (5), raising a liftable electronic scale base (6) of an electronic scale (8), when a communicating hole B (17) is higher than a communicating hole A (13) and lower than half of the height of a test piece water absorption container (3), unscrewing a water valve on a communicating pipe (9), closely paying attention to the change of the water level in the test piece water absorption container (3) through a transparent visual scale mark A (11), reducing the liftable electronic scale base (6) to enable the communicating hole A (13) and the communicating hole B (17) to keep the same height as much as possible when the height is close to a target value, paying attention to the water level line in the test piece water absorption container (3) and a water storage container (4), and preventing the test piece water absorption container (3) from overflowing due to excessive water,
(6) erecting a communicating pipe supporting device (10), turning on a lighting device (20), observing whether bubbles exist in the communicating pipe (9), and starting the test if no bubbles exist.
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Application publication date: 20210723 |